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Upgrading Compressor Wheel

sweetr33

By sweetr33,
in Engines & Forced Induction

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sweetr33 Experienced

sweetr33

Posted
Posted

hey guys n maybe gals.... i've recently recieved my new gt35r but have been wondering about whether or not increasing my compressor wheel to 66mm will be of any benifit to me, see the reason i question it is my hp target is between 450hp-500hp at the wheels but im not after anymore than that as engine may not handle the power, i have spoken to the turbo place who i got it from and they believe that the upgrade is not neccassary for the power im after, also increasing to the 66mm compressor wheel would make the turbo abit lazier as it requires more shaft energy to spin it... the ONLY reason i was looking at the upgrade really was to try make the power with not such a hi boost level (25psi or around about) if upsizing comp wheel was going to help me achieve that power at a lower boost level then i would do it, otherwise i will leave turbo as it is....your thoughts>?????

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R34GTFOUR Mentor

R34GTFOUR

Posted
Posted

i personally would leave it. 450-500rwhp is well within the limits of the gt35r, and you will have a more responsive turbo.

Dont be scared of boost, boost doesnt kill motors, bad tuning and detonation does. Running 30+psi isnt a problem on the gt35r if need be

Cubes Grand Master

Cubes

Posted
Posted

30psi. :S Not on pump fuel or without water injection.

Boost is a restriction to airflow. You need to get the motor breathing well. If you cant get it out the only way to get more in is by pushing up the boost.

The GT35r is good for up to around 400rwkw.

If the build is well thought out. Around 20psi on pump and no need for WI. If you simply bolt it on with a pair of cams don't expect to push much past 330rwkw. Cams, plenum, exh. manifold are all needed.

BHDave Grand Master

BHDave

Posted
Posted

GT35R is a 3582R in current speak yeah? so by 66mm are you talking about the inducer size? going from an 82mm wheel up to like a 94mm wheel which has about a 68mm inducer? The thing will be a nugget! That assumes you can fit all the bits together.

You'll get more benefit from fitting a bigger exhaust housing than you will from increasing the compressor side and leaving the exhaust alone.

Or if you are really concerned then do it properly and get a 4088 which at least has a matched compressor and turbine and will flow more than enough for your power target assuming the engine can breath well enough.

GeeTR Grand Master

GeeTR

Posted
Posted
GT35R is a 3582R in current speak yeah?

He’s most likely talking about the "GT35/66" or "GT35/84" comp wheel measured from inducer / exducer respectively. Its the wheel from a T04R.

As mentioned, a stock GT35/40 will do your 500rwhp, or 378rwkw. It'll do 400-430 depending on setup.

I think to highflow a GT35r would raise its flow rate to the detriment of spool time, considering you wont be running over 380 odd kw's.

Would give head room for later on spose :D

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted
30psi. :S Not on pump fuel or without water injection.

Boost is a restriction to airflow. You need to get the motor breathing well. If you cant get it out the only way to get more in is by pushing up the boost.

The GT35r is good for up to around 400rwkw.

If the build is well thought out. Around 20psi on pump and no need for WI. If you simply bolt it on with a pair of cams don't expect to push much past 330rwkw. Cams, plenum, exh. manifold are all needed.

i know of a few people running 30psi on the gt35r on pump fuel with no problems, i dont see this as a problem

True boost is a restriction but in his signature "Rb26 crank and rods, Ross forged piston, o-ringed block, 1.6mm copper headgasket, rod bolt kit and head stud kit, reprofiled cams, heavy duty valve springs, head port work, n1 oil pump, hks twin plate clutch, 600x300 front mount cooler...no turbo at the moment........ "

i'd say he's done enough to get the motor breathing well..

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
i have spoken to the turbo place who i got it from and they believe that the upgrade is not neccassary for the power im after, also increasing to the 66mm compressor wheel would make the turbo abit lazier as it requires more shaft energy to spin it...

The turbo place is correct, no reason to doubt what they are saying

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted

nope, they were ej20's, one is running 37psi

i just think that 30psi, with his mods, with a good tune on pump it would be fine but hey, if he gets it tuned and it starts to ping on ultimate 98 at 30psi with a rich tune and careful timing then i'm obviously wrong

sweetr33 Experienced

sweetr33

Posted
  • Author
Posted

yeah was only seeing wat use thought of it, was an extra 400 bucks to do it.... but yeah i'll run wat i have n change from there, im still using stock cams and intake plenum so tune on that then upgrade cams then tune and see the difference

Lithium Grand Master

Lithium

Posted
Posted
yeah was only seeing wat use thought of it, was an extra 400 bucks to do it.... but yeah i'll run wat i have n change from there, im still using stock cams and intake plenum so tune on that then upgrade cams then tune and see the difference

Strangely enough I thought I'd provided you with enough info to show it'd be a bit premature to look at going a T66 compressor. In my opinion a .82a/r GT3582R is almost overkill for what you are after... and for prosperities sake if you wanted to go "to the next level" a GT4088R in my opinion would be a far better choice than some frankenstein using a god knows how old design compressor.

r33_racer Grand Master

r33_racer

Posted
Posted

isnt that conversion for people who are pushing the 35r to its limit, so they swap the compressor over to the t04z wheel and it allows them to flow abit more...maybe go from 400kws to say 420-430kws or thereabouts. But a super efficient engine would be needed so there is no restriction, as said above i would also think the exhaust side would start causing an issue with back pressure.

Lithium Grand Master

Lithium

Posted
Posted
Has anyone seen or heard of the results of upgrading the compressor wheel to the to4z item, compared to a GT35???

Im looking to max out my GT35 (.82 turbine) soon, currently makes 510rwhp on 17.5psi, can anyone confirm the upgrade works?

I see, I'd have recognized it if Sweetr33 wasn't calling it a 66mm wheel. The T67 compressor on a GT35 is called by some who do it a GT37R if I remember rightly. That combo DOES provide a bit of an increase on a high flowing/high boost setup. Definitely comes with more lag as well, though I don't know that its very popular. GT4088R definitely sounds like a more sensible way of going about it - though the GT37R is a direct replacement for a GT3582R, nothing has to be changed but the turbo and the tune.

Think its something like a 50whp improvement or something? And yeah its for someone pushing their limits.

sky30 Mentor

sky30

Posted
Posted
I see, I'd have recognized it if Sweetr33 wasn't calling it a 66mm wheel. The T67 compressor on a GT35 is called by some who do it a GT37R if I remember rightly. That combo DOES provide a bit of an increase on a high flowing/high boost setup. Definitely comes with more lag as well, though I don't know that its very popular. GT4088R definitely sounds like a more sensible way of going about it - though the GT37R is a direct replacement for a GT3582R, nothing has to be changed but the turbo and the tune.

Think its something like a 50whp improvement or something? And yeah its for someone pushing their limits.

So you have done the upgrade as a befroe and after on the same engine without other mods? 50rwhp gain?

How much extra lag we talking in RPM to make full boost?

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