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Discussion Starter #1
I'm looking at buying a borg warner 8374 twin scroll turbo kit from full race and have a few questions.
1. What A/R would be recommended, I'm looking for about 730-750 fwhp.
2. What are the benifits of both internal/external wastegates?
3. I am currently running a forged 2.6 with headwork but hope to aventually move on to a rb32 build would this turbo run out of puff on the later?
4. My current turbo is a hks t51r (800ps max) and its very laggy, would one of these turbos be much more responcive or not worth the money changing?

Many thanks for your input.
 

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IMO
.92 OR 1.05 for RB32 depending on power
internal = space/less lag/no extra cost for wg and bov
external = less complexity
BW/PTE are there to replace these laggy turbos, worth it yes. I'd love to have that t51r kai just for the sound! With extensive headwork you might make it spool better though.

I use PTE6466 .84 T4 divided turbo (rated 900hp), will soon tune for methanol and expect to have 700whp/550wtq. Everything on my bay is simple, hate complexity on RB engines.

G luk Dan
 

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Sorry didn't write much, anyways it's there in the net.
I believe the less lag is related to the less vol pushed to spool the turbo then if you had an external wg, only minor tho. Don't want to make a fight here : )

External wg is less complex and favorable for high boost applications. Some claims external wg is better to control boost, I only used external so no experience. Issues like boost creep on int wg is gone with ex wg.. Flow pattern is better in ex wg (lower turbulence and less back pressure) In general and if you search a little you will see that external wg is better. However, you can get in touch with Full-Race regarding this subject and get better clarification and experience.

hope this helps.
Regards
 

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I have a 8374 .92 IWG on my RB30 making 620hp at the wheels on 98 pump gas.
Personal, if you were going to an RB32, both the .92 and the 1.05 are going to be too small, you would be better to get a 9180 1.05
My 8374 .92 is already too small for it and is running too much backpressure from too small an exhaust housing, and I think the compressor side is border line size as well.
You can't really spec the correct turbo for both an RB26 and RB32 as they are vastly different in what is required......if you were just sticking with an RB26 I would say 8374 .92 (but you will only get about 650hp at the wheels) but if you are defiantly going to an RB32 then it would be the 9180 1.05 for the power you want
 

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Discussion Starter #6
Thanks a lot for the response.
I'm even thinking about maybe a precision 6266 or 6466.
Natbrat300 got some amazing results on his rb26.
 

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Thanks a lot for the response.
I'm even thinking about maybe a precision 6266 or 6466.
Natbrat300 got some amazing results on his rb26.
Yep they are good turbos :)

What fuel are you going to be running? And just to confirm, by fwhp you mean flywheel hp? I'd be going a 1.05a/r hotside if you are after that much power from an EFR8374 - its on the upper end of it's capability if you are running petrol, same goes for the PT6266.

The Borg Warners are definitely better performers than the Precisions, but that is not to say the Precisions are bad at all - definitely one of the best :)
 

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Rather than opening another thread I wanted to post in this one.

I am aiming for 650-700hp

I have a Whifbitz turbo kit, just need to know what turbo I should go for which will be suitable for my goal, I don't want a turbo that will be on its limit at 650 hp, I want something that is capable of doing alot more.

I was thinking of precision, holset or a borg warner, any suggestions?

I want quick spool :)
 

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* I am aiming for 650-700hp.

* don't want a turbo that will be on its limit at 650 hp, I want something that is capable of doing alot more.

* I want quick spool :)

* I have a Whifbitz turbo kit
This is all over the place, to be honest - basically gives no real info on what you have and what you want, while also saying a lot.

Things that are helpful:

* What is the maximum power you envisage needing? And do you mean whp or engine hp? 650hp as your interim target means nothing if you actually want 900hp without changing anything.

* What fuel will you be running?

* What is quick spool? Some people expect 20psi by 3500rpm in 4th gear, others are content with it by 5000rpm, depending on what comes with that. Let us know what is liveable lag for what you want - and if you'd rather compromise power or spool if it came to it.

* What flange does that turbo kit have, T3, T4 open, T4 divided, V-Band?

* What displacement engine?

* Is money a consideration?

At this stage I'd call the Precision PT6466 one of the ultimate turbos in the range you look to be aiming for - they aren't excessively laggy, they are capable of more than 650hp @ crank without straining, they aren't overly expensive for what they do and they come with a range of exhaust housing options.
 

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I have to agree with lith, as your going is spool you will want the bb version but you will be paying around £1400. If you don't want to spend a lot of money go for precession journal bearing.whiffbitz claims full boost with your kit and borg warner s366 by 4000rpm Marcus has a new s366 for sale
 

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This is all over the place, to be honest - basically gives no real info on what you have and what you want, while also saying a lot.

Things that are helpful:

* What is the maximum power you envisage needing? And do you mean whp or engine hp? 650hp as your interim target means nothing if you actually want 900hp without changing anything.

* What fuel will you be running?

* What is quick spool? Some people expect 20psi by 3500rpm in 4th gear, others are content with it by 5000rpm, depending on what comes with that. Let us know what is liveable lag for what you want - and if you'd rather compromise power or spool if it came to it.

* What flange does that turbo kit have, T3, T4 open, T4 divided, V-Band?

* What displacement engine?

* Is money a consideration?

At this stage I'd call the Precision PT6466 one of the ultimate turbos in the range you look to be aiming for - they aren't excessively laggy, they are capable of more than 650hp @ crank without straining, they aren't overly expensive for what they do and they come with a range of exhaust housing options.
Sorry I agree there is alot of information missing, I posted it in a rush to be honest.

Power goal - 700 @ crank. so approx 570whp.

Fuel will be Shell V power, or I may have it mapped on regular then run it on V power so there is a safe margin.

I would like to have full boost at 4500 rpm anything before is a bonus.

The flange is a T4 twin scroll

Engine displacement is 2.6L

Head will have a good port job on it with the exhaust lumps removed, along with either a stage one drop in set of tomei cams or a set of stage 2 cams.
 

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Thanks for that Dan! Gonna ask him about it :)

Will the S366 be suitable for my goal? Also what about bonnet clearance

Clearance won't be a problem, yes should be pretty perfect for the power you want. On whiffbitz website it claims full boost by 4000rpm with your kit with the s366, if that's achievable you will have a good range of power
 

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Clearance won't be a problem, yes should be pretty perfect for the power you want. On whiffbitz website it claims full boost by 4000rpm with your kit with the s366, if that's achievable you will have a good range of power
Thanks alot Dan, I didn't even see it for sale. I will do some more research on the S366 and if it's all good then I'll go for it :)
 

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On whiffbitz website it claims full boost by 4000rpm with your kit with the s366, if that's achievable you will have a good range of power
I was pretty dubious of this claim from how I've seen other Airwerks turbos with the hotside this is running perform on RB26s etc (I'd be expecting near 5000rpm) so checked out the site, it clearly associates the 4000rpm spool with a Supra.... I'd not expect 3litre spool from a 2.6 tbh and even then 4000rpm is impressive to the point of ALMOST being hard to believe for the 3litre.

I've noticed a few UK tuners use ridiculously slow ramp rates when tuning which can give unrealistic boost curves - at least for anything other than pulling from low rpm in a really high gear.

Personally wouldn't go a 66mm Airwerks on a 2.6 unless you're happy with lag - I'd be more inclined to go with a Borg Warner EFR8374 for the power level you are aiming for, or if you want a cheaper Airwerks based turbo the S362 FMW would be a better match for the spool you are after. A Precision PT6266 would also be a nice fit.
 

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I was pretty dubious of this claim from how I've seen other Airwerks turbos with the hotside this is running perform on RB26s etc (I'd be expecting near 5000rpm) so checked out the site, it clearly associates the 4000rpm spool with a Supra.... I'd not expect 3litre spool from a 2.6 tbh and even then 4000rpm is impressive to the point of ALMOST being hard to believe for the 3litre.

I've noticed a few UK tuners use ridiculously slow ramp rates when tuning which can give unrealistic boost curves - at least for anything other than pulling from low rpm in a really high gear.

Personally wouldn't go a 66mm Airwerks on a 2.6 unless you're happy with lag - I'd be more inclined to go with a Borg Warner EFR8374 for the power level you are aiming for, or if you want a cheaper Airwerks based turbo the S362 FMW would be a better match for the spool you are after. A Precision PT6266 would also be a nice fit.

I would like to see it make full boost by 4500 really with a good designed manifold, we will soon find out when Saif gets his car done. From what I've seen and heard I wouldn't personally go for a borg warner efr they just don't seem to make the power like the precision turbos. The new gen 2 precision a are out and there even better with the re designed exhaust wheels. That's what I will go for when my gt40 is dead
 
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