I Need Help Picking A Turbo

[Dale FZ1]

Don't rule out a hiflow as they are cheap and make good usable power for the street. The GT3076 is always going to need a few more revs to get going than a smaller turbo like the HG SS1 PU but ultimately if the turbo makes 180-200rwkw by 4000rpm it will be plenty quick.

Some will have more top end but suffer with transient throttle response and some will be make a few less hp but be much more lively to drive. Don't get too tied up in dyno plots of turbos in isolation since there is so much more to how they drive once you get behind the wheel.

^+++

100% agreed. Some setups will drive like a jet at 100% throttle, but lack the type of response others can deliver. Search for a couple of comments by Wolverine regarding a change from GT-RS to a GT2835. Same compressor, different turbine spec, not much different power numbers. WAY different delivery.

Application the car is being used for counts a lot in my books before you'd settle for something in particular.

GT3076IW hanging off an RB25 will do sterling service between 370-400rwhp on pump 98. But there are other setups that might top out around 370hp but feel more lively/satisfying if you're running mainly lighter throttle settings and rpm under 4500.

[Mitcho_7]

If you can get the gt3076 for that price then I know what I would be doing. It seems to have decent response and solid top end. How much do the gtx3071's go for from stt?

You will need to get a new flange on the dump pipe though with the Garrett's.

[scotty nm35]

GTX3071/76 is around $1400 with no rear housing.

[Mitcho_7]

GTX3071/76 is around $1400 with no rear housing.

Was the price for a gt3076 inc. a internal gate rear aswell?

[scotty nm35]

STT $1235 GT3076IW plus will need oil/water lines, spacer, dump and an intake solution.

That's what Wolverine posted...

I didn't get prices on the GT3076 as I'm looking for more flow than it can supply. Hence I got a price yesterday on the GTX3076 ($1400 no housing) and the GTX3576 ($2200 with Tial Vband rear)

Why don't you contact him for a quote as the dollar has fallen to parity recently.

[discopotato03]

Dales post at the top of this page is what people need to think seriously about - the bit about driving around below 4500 revs . I would even suggest thinking about what happens below 3500-4000 revs because thats where 95% of cars spend most of their time .

Realistically most petrol heads will be under that as well much of the time and really only wind it up for the odd squirt .

The killer is that people start out thinking I want (for example) 400 Hp but they've never been in a 400Hp GTS25T so they don't really know how such a car drives in relation to where the increased torque starts . Its that number be it 400 600 etc etc , big numbers sound good but in reality the result can be lackluster .

Generally manufacturers size turbosystems conservatively because they know where people want power rev wise and it needs to be early so people don't have to deliberatly rev their cars . The perception is that a car with no low down "pull" is gutless and hopeless if you have to rev it to make it go .

I have not spoken to wolverine recently to see where he is up to and no BTW my R33 has not been tuned yet .

He went as mentioned from a GTRS which my car now wears to a 2835 Pro S but I didn't realise that the power didn't change significantly . IMO the important thing is does it do what he wants as in did the bigger dryer make more torque where he needed it to - note needed not wanted .

Its no secret that all turbochargers are a compromise but often , GTS25Ts are not a good example , standardish ones can work pretty well in normal use .

The hardest thing to do is partly mimic what the OE one does and increase the low to mid range torque from what the manufacturer had to the limit of traction - and have it rev reasonably freely .

Anyway GT30 based units often get mentioned for RB25s and they can make great power - but mostly not from 2500 revs with 0.82 turbine housings on them . I don't think they were ever used as an OE turbocharger on anything and probably really need to be on a 3L engine to feel good for the masses .

There has been a lot of screwing around in recent years making different compressor ends for them ie GTX and FPs HTA machined wheels and some seem to be very effective .

Recently I was sniffing around Evolutionm.net to see where David Buschur was up to and he's really chuffed with the FP modified "HTA3076" and has good some pretty good results on his RPM spec 2.3L 4G63 . I think the numbers were something like 610 Hp and 609 foot pounds of torque (peaked at 4700 revs) and this is in a 0.82 TB31 turbine housing . I don't know much about David Youngs (Forced Performance) HTA wheels (Hydraulic Turbine assist ?) but the word on the street is that they spool earlier than Garretts ones and make strong mid range torque - which is what most crave in reality .

If I was looking for a GT30 based turbo today I'd be having words with Mark from GT Pumps because he has dealings with FP and may be able to get the necessary compressor and matching ported T04S housing to make them up . Probably not a cheap way to go but dialed in things rarely are .

The HTA3073 may also be worth looking into but theres not much feedback on these yet , possibly only 4-500 Hp is seen as wussy in a Lancer Stateside .

Seems I'm not the only "local" lurking around Evom , cheers A .

[Mitcho_7]

I have an op6 hi flow on my car at the moment and it doesn't have a lot below 3500rpm. From what I have seen gt3076/gtx3076 in .82 seem to pick up around that sort of rpm as well, but they will give a lot better top end flow.

[wolverine]

I have not spoken to wolverine recently to see where he is up to and no BTW my R33 has not been tuned yet .

He went as mentioned from a GTRS which my car now wears to a 2835 Pro S but I didn't realise that the power didn't change significantly . IMO the important thing is does it do what he wants as in did the bigger dryer make more torque where he needed it to - note needed not wanted .

Firstly, get the bloody thing tuned.

Secondly, the ProS made more power than the GT-RS but surprisingly they appear to track almost identically until the ProS out muscles it at the top end on a dyno plot. What it doesn't tell you is that the response to small throttle inputs are deceptively different. The GT-RS has the smaller turbine and you just need to look at the throttle and it is away. The ProS needs comparatively a bigger crack of the throttle to get it to move in traffic. So in traffic the GT-RS is a killer for the fat slug (stagea), on the open road the ProS is better. Both turbos are a good thing just like chocolate and vanilla icecream but they are different.

If we are talking an R33 with 400kg less to lug around I imagine the difference would be less noticeable.

[Mitcho_7]

Firstly, get the bloody thing tuned.

Secondly, the ProS made more power than the GT-RS but surprisingly they appear to track almost identically until the ProS out muscles it at the top end on a dyno plot. What it doesn't tell you is that the response to small throttle inputs are deceptively different. The GT-RS has the smaller turbine and you just need to look at the throttle and it is away. The ProS needs comparatively a bigger crack of the throttle to get it to move in traffic. So in traffic the GT-RS is a killer for the fat slug (stagea), on the open road the ProS is better. Both turbos are a good thing just like chocolate and vanilla icecream but they are different.

If we are talking an R33 with 400kg less to lug around I imagine the difference would be less noticeable.

Is there a Garrett equivalent to the pro s? Might be worth a look.

What was the difference uptop between the pro s and gtrs on your car and on what boost?

[DaveO74]

I the 56 trim 3071r is the closest you will get to the pro s.

Practically the same turbo but the hks has a cropped rear wheel and a unique rear housing.

Someone correct me of I'm wrong but that was my understanding when I bought my pro s.

Just my opinion but I reckon the pro s feels a more "lively" than a 3071, but I have only been in a car that has the .82 rear as the hks has a .68

[Rolls]

I have an rb20 turbo highflowed on my rb25det, it makes 5psi by 2000rpm if you load it up in 4th, makes 18psi by around 3k and makes about 240kw

It honestly feels like it comes on sooner than the stock turbo and has mountains of midrange, top end isn't massive but for a street car it is fantastic.

[Mitcho_7]

I have an rb20 turbo highflowed on my rb25det, it makes 5psi by 2000rpm if you load it up in 4th, makes 18psi by around 3k and makes about 240kw

It honestly feels like it comes on sooner than the stock turbo and has mountains of midrange, top end isn't massive but for a street car it is fantastic.

That sounds pretty crazy!

[AngryRB]

get a gt3076 and dont look back!! end of story...

[jet2nv]

ive bought 2 gt35s and 1 gt3076 from paul aka street to track and i must admit he is the biggest help i put alot of people from sau onto him ive known him for 4 years now and his service and price is perfect i recieved my turbos within 4 days and thats from the US he is cheaper then HG just depends on what you want really

i found it hard to compare as so many people have solid results of the gt3076 internal or external on a rb25 and the power in withing 10kw give or take where HG i couldnt see a solid result to make me pay a couple of hundred more

so im keeping the gt3076IW you can be lucky and get things cheap as i got mafias old dump pipe for under $200 down to the cat and spacer plate and longer studs where only $25 total and all the braided lines i can get cheap kits ie the kinguwawa brand off ebay ive had them on all my engines and never had any problems or leaks and for $70 delivered you cant go wrong

just my 2c

[kwickr33]

HG just released a G2.5 version that appeared extremely promising.

The main reason I picked a HG SS2 is for the convince of bolton, saving time of running around and chasing bits, for me it actually worked out cheaper and I can't be happier with my end result (307rwkws with full boost at 3600rpms)

Performance level is very dependent on setups, same as every other turbos, I found HG's final results are far more concentrated, each and every model performs extremely unique in their own way. They are the most convenient internally gated turbos for a Rb25 turbo engines.

The Kandos are also making some good results, but getting there is far more involving. For a road car stick to the HG units.