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R33 With Gt3040

Bond

By Bond,
in Engines & Forced Induction

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Bond Proficient

Bond

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Hi guys this is my first post so go easy.

Anyway i have recently bough an R33 with a GT3040 (vg30 rear .68 housing, in stock comp cover) and find it way too laggy....starts to just come on at around 4200rpm and gets going around 5000rpm. Its pretty stock only having a 3" Blitz exhaust (straight through) and Tomei 255l pump.

At first i thought the extra lagg was good because when my g/f drives it its very tame but now i really am looking for more power especially down low!!!!! I know i need to get a power fc, injecters and front mount b4 i wind up the boost but i dont see the point if its just going to make more power up top and still have nothing down low. Top end is not bad now but revving to 7k every time i want to over take isnt the best.

I'm very tempted to put a stock turbo on it and just drive it.

Any thoughts would be great.

Cheers james!

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HYPA33 Community Regular

HYPA33

Posted
Posted
Hi guys this is my first post so go easy.

Anyway i have recently bough an R33 with a GT3040 (vg30 rear .68 housing, in stock comp cover) and find it way too laggy....starts to just come on at around 4200rpm and gets going around 5000rpm. Its pretty stock only having a 3" Blitz exhaust (straight through) and Tomei 255l pump.

At first i thought the extra lagg was good because when my g/f drives it its very tame but now i really am looking for more power especially down low!!!!! I know i need to get a power fc, injecters and front mount b4 i wind up the boost but i dont see the point if its just going to make more power up top and still have nothing down low. Top end is not bad now but revving to 7k every time i want to over take isnt the best.

I'm very tempted to put a stock turbo on it and just drive it.

Any thoughts would be great.

Cheers james!

I have a 3040 on my r33 has .82 rear starts spooling at 3500 full boost (18psi)at 4000.

are you using the stock exhaust manifold

what size dump pipe

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Bond Proficient

Bond

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Yes its a stock manifold and yes its a genuine garret built by ATS in Melbourne. I would have thought with the 0.62 it would spool up a lot quicker especially under load in 3rd. I would love it to start at 3000rpm!

Will a tune (with power fc) help this or do my problems lie somewhere else?

Also it seems to be running very low boost (looks around 4psi), but i will confirm with an aftermarket guage in the next few days. Am i able to use an adjustable boost controller and wind it up to say 8 or 9 psi with stock computer???

Once again thanks in advance.

James

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R33GOD Grand Master

R33GOD

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change the actuator on the turbo to an ajustable one. Thats what i had on it a while ago before i restored it to standard.

When i had it setup i was making fullboost by 3,800.

Get an ajustable actuator (hks)

ecu (will bring boost on earlier)

front mount cooler

Then youl be good as gold

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Al Grand Master

Al

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Check you boost actuator; if it's soft or lazy it will be opening the internal gate too early, causing turbo to be laggy and not boost up properly.

I would personally take it to a mechanic that has a dyno and knows how to diagnose these issues.

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Al Grand Master

Al

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i would change the exhaust manifold, get a power fc and adjustable exhaust cam gear

Hell no. Not worth the $'s with that turbo/setup. I made 275rwkw with the standard manifold and great response using a turbo very similar to this and a GTRS.

I have seen others make over 330rwkw using the std manifold.

As others have stated:

- ECU + tune

- Good actuator

- turbo back exhaust

- fmic

then to optimize the set-up

- Injectors

- Boost controller

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HYPA33 Community Regular

HYPA33

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its not about making power. you want to make it came onboost faster. when my car was running a apexi rx6b turbo i change the stock manifold for a stainless low mount it started coming onboost 1000 rpm faster. didnt give it a bigger number on the dyno but made it faster.

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paulr33 Grand Master

paulr33

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1000rpm is unlikely but this isnt an apexi RX6 were talking about, its a cropped vg30 rear

nothing like an RX6 housing

it would be silly using an rx6 on stock manifold, it would be like trying a t67 or t88

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Al Grand Master

Al

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1000rpm just from a manifold on what isnt a big turbo in most terms...

Interesting...

Agreed :D

Also....fitting a hiflowed std turbo to a high mount manifold is a BIG waste of money. This turbo should be making full boost by 3800-4000rpm max.; if it's not, there is something wrong with the setup/tune. Fitting a top mount manifold will not fix the problem.

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Bond Proficient

Bond

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Ok bit of an update.

I fit a boost gauge today and its boosting to only around 4psi. I fit a manual boost controller and nothing happend....... I went back and had a look and the wastegate flap thingy was set so that it was open all of the time!!!! Obviously the previous owner had done this after he pulled the supporting mods off to keep it safe!

Well i angled the actuator so that it was shut and went for a quick spin and geeeeee what a difference. Boost starts at 3000rpm and keeps going until around 8psi. I could actually year the turbo this time. Anyway i only did this once or twice and cruised home so not to do any damage and will put it back the way i was.

I'm just happy to find out that it was something very simple and cant wait to get it tuned once a get an ECU.

Thanks

James

PS: Does the standard ecu warn if the injecters are at 100% duty and i'm leaning out?

Does anyone think its safe to run maybe 5-6psi? I want to put it back so the wastegate is shut and i can get some reasonable low down torque but not want it to boost any higher then say 6psi.

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