turbo choice

[Roy]

Responsive and the T3 flange can bolt onto the standard manifold, I'd change the exhaust manifold as this also helps with response.

At those power levels are you sure a manifold improves response? Just asking as i wouldnt have thought at that sort of cfm the manifold couldnt be that bad a thing?!?!?

being on the topic of turbos once again..

i'm in two minds ....volume over response ....

i'm not that good at reading comp. maps.. but if someone can help me out ..i would appreciate it.

http://www.turbocalculator.com/compressor-...aps/t04b-v1.jpg

If you want to pm me your email address i have just thrown together a rough spreadsheet, prob is i cant attach an xl file

[Angry]

pm sent .. thanks man

[cameron]

At those power levels are you sure a manifold improves response? Just asking as i wouldnt have thought at that sort of cfm the manifold couldnt be that bad a thing?!?!?

If you want to pm me your email address i have just thrown together a rough spreadsheet, prob is i cant attach an xl file

Off boost response is better. Alows your exhaust gasses to escape quicker because the manifold is bigger, and at high boost the standard manifold would be restrictive i would think.

Comparing it to somthing like a HKS tuned length manifold.

[Roy]

Off boost response is better. Alows your exhaust gasses to escape quicker because the manifold is bigger, and at high boost the standard manifold would be restrictive i would think.

 

Comparing it to somthing like a HKS tuned length manifold.

Yeh thats cool, i tend to agree, but at the sort of power level you are talking with GT-SS/2530 etc etc im curious if in the real world it makes jack sh1t performance or is worthwhile...plenty of SR20 guys go aftermarket manifolds with turbo upgrades but you see very few RB guys do it.

Could be the SR manifolds are crap std just like the the std SR AFM!?!? Dont know, just curious to hear from someone that can speak from personal before / after experience

[cameron]

Your proberly right, at thoes power levels the stock manifold shouldnt be too bad.

From expierence I'd say that you can notice the response is better off boost with the aftermarket tuned length manifold, This is with a GT3040 turbo tho it may be alot different with say a HKS 2530.

I'd just though that the standard ex manifold would choke at around 17psi because its flowing so much air the little manifold will have trouble letting the exhaust gasses excape ?

An adjustable cam gear can help with spooling of the turbo.

If your looking at response and quick spooling I'd go with tuned length ex manifold and a HKS 2530, 2540 depends on if you want to spend the money while your changing the turbo.

[Angry]

i;m leaning towards something like a To4B S Trim .. Vtrim just too big for what i want ....gotta thank Roy for helping me out ..makes choosing a turbo a bit easier ..

doing the math and all taht for a Strim .. its just outside the surge line by like 500rpm the way i figured it anyways....... that sort of lag can be tuned out with like bigger lift cams and adjustable cam gears? at 18psi i doesnt make useable boost till about 4000grand and just runs out of puff at 7500 ..at 3500 is were the math plotted me out to ..surge/lag country

any reccommendations while were on the subject .......so for hijacking dude.

Matt

[discopotato03]

Angry , its no secret that old TO4B series compressor wheels are truly archaeic . The eight bladed versions are definately Diesel application . There are a couple of six bladed TO4B wheels that work HEAPS better in petrol applications . The most common one (maps anyway) is the H trim . These need less shaft (turbine) energy to spool up at lower exhaust gas speeds and are less prone to surge at higher engine and turbine speeds .

You probably need to also look into the TBO3 and TA34 range of Garrett turbos . From memory the TA34's are a factory hybrid T3/TO4E with integral waste gates . They use different exhaust housings and turbines to the old Nissan/Garrett T3's .

Fred from Turbo Logic once showed me one of these and claimed that the RB20 boys loved them . I once had lists of these from the net but threw it all away when I got the GT28RS .

Honestly the BB turbos are way to go . Its living proof that turbos don't have to be physically huge to give breathtaking performance .

Cheers A .

[SHUTO-BOY]

my old gtst had a junkyard hybrid t04B+big exhaust housing of some sort and made good power(360rwhp..best time 12.7).But its not worth getting something youre not sure about(i was just lucky)

On the other hand i have driven gtst-vspec's car,and the response/power is mind boggling(the big power curve does not lie) and its not laggy.GT30 must be the best street combo for a gtst.

[Roy]

i;m leaning towards something like a To4B S Trim .. Vtrim just too big for what i want ....gotta thank Roy for helping me out ..makes choosing a turbo a bit easier ..

doing the math and all taht for a Strim .. its just outside the surge line by like 500rpm the way i figured it anyways....... that sort of lag can be tuned out with like bigger lift cams and adjustable cam gears? at 18psi i doesnt make useable boost till about 4000grand and just runs out of puff at 7500 ..at 3500 is were the math plotted me out to ..surge/lag country

any reccommendations while were on the subject .......so for hijacking dude.

Matt

discopotato03's comments sound close to the mark. I only had a quick look and my ability to read compressor maps leaves a lot to the imagination, but the compressor map didnt look to be that great a fit.

Close to the surge line, didnt seem to flow all that much cfm wihtout bug shaft rpm, but it didnt strike me as being all that good a thing as it didnt hit home with good cfm even with big boost?!?!?!. Others would likely know more

[croat]

Why 2530 aparently they are no good on a larger engine like the rb25 as far as i have read. a HKS 2535 is the go for an rb25. Not sure about the 2540 but i think you will need to do cams to get it to its full potential otherwise may be laggy???

[Angry]

i lookd at GT28R comp maps .. but it was more the other way around .. top end was off the end of the island ..but boost came on pretty early.

i've pretty much dismissed the T04 S Trim for sure .. too much lag ..and its pretty old

but on teh same note .. u mention a hybrid t04/t3 setup . .funny that coz i'm lookin at one t3 flange ..Super 57 Trim.. both graphd points fall inside the island .. but i'm not sure on its effiency at them points. or if it would work well enough.

shuld be attached .. its rough .. no accurate obviously. anyways

thanks agian

[Guest Robo's]

God, how do you read those things

[Sydneykid]

i lookd at GT28R comp maps .. but it was more the other way around .. top end was off the end of the island ..but boost came on pretty early.

i've pretty much dismissed the T04 S Trim for sure .. too much lag ..and its pretty old

but on teh same note .. u mention a hybrid t04/t3 setup . .funny that coz i'm lookin at one t3 flange ..Super 57 Trim.. both graphd points fall inside the island .. but i'm not sure on its effiency at them points. or if it would work well enough.

shuld be attached .. its rough .. no accurate obviously. anyways

thanks agian

To me it looks to be too low on the efficiency island at 1.2 bar, really wants 1.5 bar to be working in its best range, that's around 43 lbs per minute (~430 bhp). But at 1.5 bar you run into surge problems at 25 lbs per minute (~250 bhp). It would take a pretty well tuned engine to operate in that range all the time. Ok for a race car but I would prefer something with a bit more of a surge free power spread for a road car.

My 20 cents worth

[Angry]

hmmm *scratches head* too large?

so maybe.......

perhaps something with a smaller trim? 46 , 50 or 54 t04E setup .. internally gated

http://www.turbocalculator.com/compressor-...ps/t04e-s46.jpg

http://www.turbocalculator.com/compressor-...ps/t04e-s50.jpg

http://www.turbocalculator.com/compressor-...ps/t04e-s54.jpg

one of em has gotta fit ... :headspin: :headspin:

thanks

[Roy]

hmmm *scratches head* too large?

so maybe.......

perhaps something with a smaller trim? 46 , 50 or 54 t04E setup .. internally gated

http://www.turbocalculator.com/compressor-...ps/t04e-s46.jpg

http://www.turbocalculator.com/compressor-...ps/t04e-s50.jpg

http://www.turbocalculator.com/compressor-...ps/t04e-s54.jpg

one of em has gotta fit ... :headspin:  :headspin:  

thanks

LOL...wait til next week Angry and ill take you for a spin :headspin: (actually ill try not to lose it) ...try again a drive in my car with the TD06 on it.

There are a few compressor maps around of the TD06 (Mitsubishi only, i havent been able to find a Trust compressor map) and you will be able to see how it drives, then you may be able to better correlate a compressor map with seat of the pants driveability.

It helps to go for a ride in a few cars with different setups to get a feel for how they actually drive. I so wish i could have gone for a drive in a few modded RB20s before buying my setup, ultimately im glad i didnt go for the hi-flow bolt on or 2530 option, sure they could very well be quicker, but they are nowhere near as fun

[sweetr33]

from what ive read, the hiflow option would be perfect for u at the moment, comes back all in one piece as if u hadnt sent it away, its bigger internally and is basically brand new. My choice over others.

[Angry]

yea thats teh ticket Roy..... i'm not out for bulk power output .. more so something with good low to top end pull .. and enjoyability ..with the car being an auto ..and 0 -100 around the 7.second area ..if i can take 2 seconds at the most off that i'd be laughing thats for sure.

hopefully i'll work it out eventually

[PHaT MR30]

Do the GT30's fit to the std manifold? don't think that has been covered yet?

and are they only externally wastegated in the .63 housing?

what sort of price can they be had for?

[discopotato03]

Your trying very hard to assess bush bearing B and E stuff here . B stuff is Durassic Park aerodynamically speaking and E wheels are 3" diameter . Garretts T3/TO4E hybrids (properly known as the TA34 Series) specifically used small trim compressors (E series) to get the drive requirements (shaft torque) down to where the turbines could reasonably cope . I kid you not , ever seen a 37 trim TO4E wheel ? They do actually work but there are better ways to get the job done . I'd look into a GT2871R (Garretts version of the GTRS) and buy seperatly a HKS 64AR T3 flange housing for its NS111 Turbine . The aim is cheap compared to HKS and with minimal work bolts up .

Chow a .

[SLY33]

All

there are SO OOOOOO many thread on turbo choice here, and would like to get some peoples experience with turbos down here ...

I'm thinking of a new turbo in the next few months, and have read the whole high flowing v BB turbo threads ...

I'm in agreement with sydney kid about the whole useable power thing, and a turbo is absolutly no good to me if it does not come on boost until 4500 rpm ...

i'm looking for something to produce about 17psi psi, and start to come on boost at around 3 - 3500 rpm (ish)

I rarely touch near the red line, doing most of my hard driving in the 4-6000 rpm range ..

Its a S2 GTS-T with a hks pod, and turbo back 3", emanage is on its way ....

so what is the best turbo choice for this application ???

you specify: up to 6000rpm, 17psi, good boost response, USABLE power.

Just have a look at my HKS2530 results in the DYNO RESULTS thread. This turbo sounds perfect for what your after, plus you wont have to do injectors or manifold. Most importantly the turbo couldnt be more "useable"! Boost is always there when you want it, and its extremely happy at 1.2bar.