$350 Turbo made 253rwkw @ .9bar

[muffas 180]

BOOSTD Did maching the groove reduce the surging? Or isnt it back on the car yet. Im going to wait till your 100% happy with yours before i go and build one. Thanx Michael...

[BOOSTD]

Haven't installed the turbo yet, my head is beening ported and I'm still waiting for my OS pistons. Will keep you posted and load the pix when the site is working properly.

[rbs13]

BOOSTD - i have a rb20 with fmic, exhaust, boost controller, fuel pump and regulator.. i take my rb25 turbo to a turbo place and say hi i want a a to4 v trim comp wheel in place of the std one.. and the turbo snout machined/bored/what ever ya wanna call it out to 53mm.. then i bolt this turbo on and make 250rwkw at round 1bar boost simple as that? bearing in mind ill have to get injectors and remap and a new air flow meter.

[EnricoPalazzo]

Hahah i love the repost.

Mate yes, but shit loads of lag. Think about it, BOOSTD on a RB25 had full boost by aprox 3700-3900RPM when he installed the cam gear. This was when the Snout was at 51mm. By machining it to 53, it will increase lag, yet make more top end power and eliminate surge. So i cant say what full boost would be reached at now, but aproximate maybe 3-400RPM higher now in the rev range. So basically a RB25 will make fullboost with the cam gear at around 4300RPM im guessin.

Imagine what fullboost would be like on an RB20, maybe 5000rpm??

It would be a lag monster.

[rbs13]

thanks for the reply dude.. yea gotta love the repost idea..

yea lag isnt too much of a problem.. may as well give it a try! thanks. maybe cams/ cam gears will have to be added..

[Steve]

rbs13, by the time you have added all the other bits, put in cams and cam gears, the price is starting to get up a bit.

Just by a HKS 2530 or Trust T517 and you will probably be alot quicker than an R33 with 250rwkw.

[EnricoPalazzo]

What u gotta understand is that its not as cheap as it sounds.

So okay u do the turbo mod for 350 bucks.

On a RB20, u will need to upgrade: Clutch, very expenisve, Internals, as Rb20 cant take as much power as rb25, Gearbox as rb20 g/box is prone to failure at higher power levels, upgraded fuel supply, and then a retune of ur ecu.

Probably about 5g worth for it on a rb20.

[muffas 180]

Hey BOOSTD,

I got a price on a new TO4 v trim comp wheel from GCG today. They said $73. They then told me it wont fit on a RB25 turbo shaft. Is that the wheel you have put on the turbo or is there a few dif ones?

Thanx Michael...

[BOOSTD]

Dean: 15psi by 4000rpm will eliminate surge which is what I'm aiming at with 53.5mm

Muffas 180: The comp wheel was modified to fit the shaft. The thick shaft from a VG30 is the one to look for, tonnes my reliable on the Ceramic turbine side.

[ed]

Just wondering if your replace the exhaust wheel with a bigger steel wheel, would this help reduce lag?

[BOOSTD]

The Vtrim cannot be allowed to make 15psi before 4000 rpm or it will surge. A steel wheel will cause more restrictin and reducing lag is not what a good thing.

[rbs13]

i thought about a 2530 and its too small.. i want something thats a bit laggy.. cause i hate commin on boost when i dont want to.. just driving slowly round the place. plus after being in a car with a huge turbo.. i have seen the light.. haha. but yea.. i got the fuel pump, clutch, regulator, exhaust, fmic im just going to go stock ecu but remap it i think the rb20 will be fine with 250rwkw on std internals just gotta make sure the tuning is fine! iv still got a bit of time before ill have the money to fully purchase/mod the rb25 or vg30 turbo for this.. so i still got time to decide what i want exactly.

[Clicks]

I'm lost..

originaly i thaught it was just

get your r33 turbo

take it to your turbo place and get a vg30 Exhaust housing put on there.. Get them to machine that out to 53.3mm - Through away the stock turbo housing.

Next get a t04 V Trim compressor wheel and put that onto the stock turbo shaft. Bolt all back together and drive away. Is this correct?

You said somthing about the to4 wheel needing to me modified now?

What are places talking about breaking the exhaust wheel for? they are not touching that right? just the compressor wheel?

[BOOSTD]

Depending on what shaft is used. There is a thick and thin one. You will see what I mean when you look at a few sitting on the shelf. I chose the thick one as the turbine is more reliable. The T04 needs to be drilled to fit.

[EnricoPalazzo]

Depending on what shaft is used. There is a thick and thin one. You will see what I mean when you look at a few sitting on the shelf. I chose the thick one as the turbine is more reliable. The T04 needs to be drilled to fit.

Maybe u should re explain everythin cos i think everyone is confused. And make it really simple

[rbs13]

i think i have a solution for ppl using rb20 and want this type of turbo. or power i should put it.. we wouldnt have to bore/machine out the turbine as much would we? by machining out the turbin as you have said you are just taking the exhaust housing and where the exhaust wheel is.. just open that up a heap.. you were saying that you car (rb25) would spool it up to quickly causing surge right? well on a rb20 this wouldnt be such a problem.... would it? or at like 6000, 7000 would it cause surging? when i go ahead with this turbo i think i will start off by not going straight to a 53mm bore on the exhaust side.. what did you start off with and do you have any recommendations for me? as to what size would be small enough to help comming on boost but also eliminating surge. hope you can help.

also.. the rule is dont have more than 15psi by 4000rpm right??? with this turbo i mean. if this doesnt make any sence.. please say so and ill try to unjumble it.. but yea.. shouldnt be too hard.

[BOOSTD]

i think i have a solution for ppl using rb20 and want this type of turbo. or power i should put it.. we wouldnt have to bore/machine out the turbine as much would we? by machining out the turbin as you have said you are just taking the exhaust housing and where the exhaust wheel is.. just open that up a heap.. you were saying that you car (rb25)  would spool it up to quickly causing surge right? well on a rb20 this wouldnt be such a problem.... would it? or at like 6000, 7000 would it cause surging? when i go ahead with this turbo i think i will start off by not going straight to a 53mm bore on the exhaust side.. what did you start off with and do you have any recommendations for me? as to what size would be small enough to help comming on boost but also eliminating surge. hope you can help.

also.. the rule is dont have more than 15psi by 4000rpm right??? with this turbo i mean. if this doesnt make any sence.. please say so and ill try to unjumble it.. but yea.. shouldnt be too hard.

The rb20 will spool up this turbo later, so theoretically you can have a smaller turbine snout. Strangley enough boring out the turbine snout made hardly any difference to boost response.

[Clicks]

I Don't know if you guys want this or not... but I have a copy and paste (on my hdd) of all of the old post's from before it went down again.. here it is from when we lost it.

Posted by BOOSTD on 18-11-2003 04:22 AM:

Turbo is still running strong, been running 16-18psi with 266rwkw. Engine is currently having forged pistons fitted which gave me a chance for some pics. And keep you all up to date with my current mods.

Ok pix will be up soon.

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Posted by Squizz on 18-11-2003 05:23 AM:

So for those of reading this and just nodding and smiling... We need the following.

an R33 Turbo.

the exhaust housing of a VG30BB turbo.

a T04 compressor wheel.

The exhaust housing is bored out and swapped with the R33 one but you still use the standard R33 exhaust wheel. The compressor wheel is swapped for the TO4 wheel and the compressor cover is machined to suit?

Yeah?

Or do I have this ass-backwards?

And Megs give us the details of using RX7 parts champ...

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Posted by BOOSTD on 18-11-2003 05:30 AM:

perfect

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Posted by Squizz on 18-11-2003 05:33 AM:

Whew!

Well the R33 turbo would be easy enough but where does one the exhaust housing off a BBVG30 (and don't say on the end of a BBVG30) and a TO4 wheel?

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Posted by Squizz on 18-11-2003 05:38 AM:

Also, could you start with a VG30 Turbo and just bore the exhaust housing and fit a T04 compressor wheel and mill the cover to suit?

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Posted by BOOSTD on 18-11-2003 05:47 AM:

yes comp covers are the same A/R for RB25 and VG30. Most VG30bb turbos r shagged now so the Housings are easily bought thru a local Turbo shop. don't pay more than $50.

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Posted by Squizz on 18-11-2003 05:49 AM:

Might have to wait til I move to Brisbane. In Rocky we have no "local turbo shop". If I wanted a 4BBL Carby and a Holley Blue I'd be set...

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Posted by BOOSTD on 18-11-2003 06:08 AM:

Adealide Turbo Services will have some. You can get it posted.

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Posted by rbs13 on 18-11-2003 06:27 AM:

and this would work on a rb20???????

. . .

rb20det silvia

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Posted by BOOSTD on 18-11-2003 06:31 AM:

it will with more lag.

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Posted by SeriesIIGTST on 18-11-2003 07:21 AM:

I'm a little confused but not being mechanically minded that's not a difficult thing for me.

From my understanding you're swapping the compressor wheel but not the exhaust wheel correct? Isn't the ceramic wheel of the stock turbo's what makes them weak? Why would you retain this then??

oh, and i take it the r33 turbo best not be shagged before you do this? Sorry for the dumb questions but that's the only way i learn the car technical stuff....in lamens terms

. . .

Where'd Cylinder 6 go

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Posted by rev210 on 18-11-2003 07:53 AM:

the ceramic wheel is only a weakness to the person who boosts the turbo beyond 1 bar. The chase is for 'power' and not to see how much boost you can stuff in a motor. Less boost is better.

Boosting beyond 1 bar doesn't make enough power to be worth it. BOOSTD's turbo setup makes excellent power at only 0.8 bar.

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Posted by SeriesIIGTST on 18-11-2003 07:59 AM:

(Quote:)

Originally posted by BOOSTD

Turbo is still running strong, been running 16-18psi with 266rwkw.

Thanks for the reply Dave but doesn't 16-18psi equate to more than 1 bar? Also, from what i'm reading is this turbo simply an R33 turbo with a VG30BB exhaust housing and a T04Vcompressor wheel?

. . .

Where'd Cylinder 6 go

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Posted by DoughBoy on 18-11-2003 08:13 AM:

SeriesIIGTST, maybe the airflow required for 16-18psi with this high flow requires lower shaft speeds than that of a conventional R33 turbo? If it did, then the ceramic wheel would be less prone to snapping off due to less heat/ slower speeds...

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Posted by EnricoPalazzo on 18-11-2003 09:01 AM:

Actually BOOSTD and i wer talkin about this one day and the main failure of the ceramic wheels is when they hit the housing of the turbo from spinning to fast, and hence weakening and falling off. BOOSTD has machined it so that the ceramic wheel cannot hit the sides hence become weaker, and the turbo should last. Like he said, hes been running the thing at highish boost for a while now, and he does give it alot of stick.

Posted by SeriesIIGTST on 18-11-2003 09:16 AM:

BOOSTD: While you;ve got your engine in pieces, any chance of getting some pics of your turbo up? Also, does adding the VG30BB exhaust housing require a new dump pipe to be made up too?

. . .

Where'd Cylinder 6 go

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Posted by EnricoPalazzo on 18-11-2003 09:47 AM:

No it all bolts on to stock manifold.

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Posted by rbs13 on 18-11-2003 10:59 AM:

so your still using the stock wheels.. just a differnt comp/exhuast housings... with machining..

. . .

rb20det silvia

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Posted by roz85 on 18-11-2003 11:07 AM:

BOOSTD, what is the benefit in fitting the vg30 exhaust housing over the original rb25 housing?

Reason i ask this, is i have the vQ30 turbo (sent you an email about it a while back) and recently had a custom dump made up for the unsual flange. Now what i want to know, can the huge gains still be had by changine to a t04 compressor housing a compressor wheel, and keeping the existing VQ30 exh housing?

Cheers

Anthony

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Posted by EnricoPalazzo on 18-11-2003 01:29 PM:

I think u can use either rb25 housing or vg30 can be uses aswell if wanted.

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Posted by roz85 on 18-11-2003 02:35 PM:

(Quote:)

Originally posted by rbs13

so your still using the stock wheels.. just a differnt comp/exhuast housings... with machining..

Ok, see if i can get this right - BOOSTD please let me know if im correct.

1. All he is doing is machining the replacement (vg30) exh housing so that the snout is no longer the original 42mm, rather its 52mm. This (as already stated) will ensure that the exh wheel will not hit the exh housing at high speeds. The other reasons for maching the exh housing were given in the first post (to eliminate surge).

2. Then he replaces the standard compressor wheel with a t4 item, and has the standard compressor cover machined to fit the wheel.

If this is correct, it seems simple enough for me!

BOOSTD?

out of curiosity, what other compressor wheels would be suitable, apart from the t04 v-trim?

Anthony

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Posted by rev210 on 18-11-2003 02:44 PM:

compressor housing is T4 as well, original compressor housing thrown in the scrap bin.

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Posted by roz85 on 18-11-2003 02:47 PM:

really, what would i ask for when purchasing such a cover? i ask for a t04 vtrim compressor wheel & ...........

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Posted by BOOSTD on 18-11-2003 11:28 PM:

Rev210: Original comp cover is used.

There are a combination of reasons why the VG30 A/R exhaust housing is better. Firstly the A/R of .81 reduces power robbing back pressure which causes a combination of problems. The V trim compressor has great flow for it`s relatively small size, however as a downside cannot make more that 15psi before ~4000RPM without surge. The VG30 exhaust housing will be machined(today actually) right to the flange edge to eliminate any chance of surge. A standard RB25 exhaust housing simply is to small( spool to early ) for the Vtrim wheel and will surge no matter what.

roz85: spot on mate, There are other wheels which will fit but you will run into problems if you are chasing bigger flow as the .6 A/R comp cover will keep you in the surge zone of most comp maps. I looked at a 62-1 wheel (same as subzero's 10sec GTST) but would have to have a .7A/R comp cover to work. Hello lag to.

This hybrid starts making boost pretty much straight away and goes from nothing to nuts in about 400rpm. Lag was alittle noticable without my adjustable cam gear. Then again I like no lag.

Will be making a few final mods today as very slight surge was still occuring at high gears at low rpm. Lastest mods will be machining the exhaust snout right to the flange and machining a lip in the comp housing snout right above the primary comp blades. This is a technique used by nissan in the standard R33 turbos to eliminate surge. Also have a HKS wastegate on it's way from greenline ($155) as boost drops off at high rpm because of the standard wastegate actuator spring pressure. Aiming for 280rwkw at 19-20psi.

Pic will be loaded today.

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Posted by Robo's on 18-11-2003 11:37 PM:

Your doing an excelent job.

Im new to turbos and all these ratio things, but would love to build one up similar to you and experiment around.

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Posted by BOOSTD on 18-11-2003 11:56 PM:

Exhaust

VG30= 3 fingers

RB25= 2 fingers

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Posted by BOOSTD on 19-11-2003 12:02 AM:

comp

Vtrim

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Posted by BOOSTD on 19-11-2003 12:09 AM:

exh

..

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[Clicks]

Posted by roz85 on 19-11-2003 01:48 AM:

ok. Not real sure, but i can remember fitting 3 fingers in exhaust housing. Which would mean, i can mearly machine the snout, fit the vtrim wheel and get the comp cover machined out.

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Posted by BOOSTD on 19-11-2003 05:21 AM:

Exhaust housing has been machined out to 53.5mm now which brings it right next to the flange. Also machined a slight bell mouth at the top for better flow. I will take some pics tonight. The comp cover is next, I will keep you up to date.

matt

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Posted by EnricoPalazzo on 19-11-2003 09:22 AM:

Cool. So i thought u told me to keep the RB25 housing. Now u say VG30, or am i totally confused like usual.

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Posted by rev210 on 19-11-2003 11:54 AM:

BOOSTD,

the exhaust housing on your VG30 turbo is the same as the R33 unit I have at home. 3 fingers fit into the housing and it looks the same size from the back.

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Posted by rev210 on 19-11-2003 12:01 PM:

the RB25det tirbo snout is 42mm standard also.

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Posted by rev210 on 19-11-2003 12:05 PM:

the RB25det turbo snout is 42mm standard also.

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Posted by deano_33 on 19-11-2003 12:25 PM:

This threads getting pretty popular...

Just making sure,

You get a standard r33 turbo, take the exhaust wheel off, take the exhaust housing off. Get a VG30 exhaust housing, machine out the bit which surrounds the exhaust wheel to 53mm diameter. Bolt the VG30 exhaust housing onto the R33 turbo, put the standard r33 exhaust wheel on. On the compressor side, you fit a T04 V trim comp wheel inside the standard r33 compressor housing [Does this need machining at all?]. This is your new hybrid turbo.

This might be a stupid question, but how do the wheels attach to the shaft i.e. how do you change them?

Then you bolt the bastard onto your car - manifold flange is same, bolts straight on, exhaust flange is same (to dump pipe), bolts straight on. Compressor side housing hasn't changed - all bolts up. You connect up the standard oil lines. You connect your boost controller.

You already have FMIC, full exhaust, ECU so all you need is a tune and you're off fryin' the bags.

Approx $350 for the turbo (a whole lot of time playing with it all)

$100 for some dyno time......

Maybe $500 later and bulk more rwkw.

Do you reckon to run 1 bar an AFC would be enough or do you need the timing adjustability of a proper aftermarket ECU?

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Posted by deano_33 on 19-11-2003 12:29 PM:

Hey what the?

Does this mean you may not even need the VG30 exhaust housing, just machine out the standard housing?

Save 50 bucks there!

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Posted by rbs13 on 19-11-2003 01:18 PM:

the vg exhaust housing is bigger..

. . .

rb20det silvia

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Posted by ed on 19-11-2003 01:39 PM:

I wanna know who can machine and how much it would approximately cost

. . .

Skyline Cruise

http://www.skylinesnsw.com/community/showt...=&threadid=4236

W.....TeamWestSide....W

www.SkylinesNSW.com/community

Now, the new tuning way is asking for response but not only stupid peak power at asmall rev range, this will let you get the driving pleasure on the wide rev range.

[BOOSTD]

Yip yar, nice one Clicks