Suggestions On What To Do Next On My R33

[Tweaky]

Hey guys , would like some suggestions on what would be recommended to do next for my R33 GTS-T to reach or break the 330rwkw mark. Also the best value for money & power gains. I will list what mods have already been done to the car & also some pics of the engine bay ! It is currently making 280rwkw on 20psi & was only tuned bout 2 weeks ago. Have already talked to my Performance workshop where i take it to on what he suggests to do next . Would also like some imput off other skyline enthusiasts ! I want to stay with the Rb25 block , no 3 litre bottom ends.

We have been talking about replacing the standard plenum to either a Hypertune or Plazmaman plenum with same brand throttle body . Also changing exhaust manifold to inhouse custom made one & start looking into some head work. Aswell as changing from a standard cam & switching to a different Ecu which is more tune able . Thoughts & ideas would be much appreciated

Mods -

• Rb25 engine
• 40 thou oversized Aria pistons
• Eagle steel rods
• APR headstuds
• Cometic headgasket
• HKS adjustable cam gears
• HKS 550cc injectors
• Garrett GT35/40R turbo
• Standard plenum but been converted to forward facing
• Ford XF 80mm throttle body
• Spitfire coilpacks
• Microtech Lt x 12s ecu
• Turbosmart E boost 1
• Turbosmart 48mm external wastegate
• Turbosmart Plum back BOV
• XTR 4 inch FMIC
• 2 x Bosch external fuel pumps with surge tank
• 3 inch turbo back high flow exhaust system
• Jimberry high pressure race clutch
• Standard cam
• Standard head

[DR 32R]

Is E85 in you area? Retune for E85, E85 fuel system. Or do you need to achieve your target on pump fuel?

[TiTAN]

if that is a 0.63 GT35 340kw should be a walk in the park even more power if its the bigger housings.

[Harey]

Power sounds low for a GT35 with 20psi! As Titan said you must have the 0.63 exhaust housing??

If you do, then put a 0.82 housing and retune done!

The intake plenum is not required. It will simplify your piping and may drop intake temps slightly but not essential. An exhaust manifold would help quite a lot above 300rwkw but I think you can get 330rwkw out of it on the standard one without any issues.

E85 is the other option too for another ~30rwkw.

[R31Nismoid]

• Standard plenum but been converted to forward facing - issue, likely to have flow problems

• Ford XF 80mm throttle body – not required, stock is fine upto 400rwkw. Going larger just creats throttle control issues

• 3 inch turbo back high flow exhaust system - issue - you need at least 3.5"

As for the rest, 290rwkw @ 20psi from a GT35, you have a serious problem.

A GT35 will make 360-370rwkw comfortably on 20-24psi usually.

Exhaust is probably a cause.

You make no mention of what exhaust manifold either, or external gate?

It looks like a tiny rear housing from the small pics which would suggest a .63 rear, which is a bad choice for such a turbo.

So change that, along with exhaust. Decent manifold and gate and you'll be set.

That'll come at a cost of around 5k though, so its not exactly a cheap return

[PM-R33]

As Ash has said.

If it is a .63 rear, change to a .82 housing and a 6BOOST/ETM manifold with your external gate. This should straight away see you at your power goals.

Then if you want to push it furthur, free up the exhaust gas flow with a larger exhaust and remove the chopped up plenum. As far as I am aware Hypertune don't make anything for RB25 heads, so just go the Plazmaman one.

[R31Nismoid]

thinking... if only 330rwkw is the aim.

that's right on the new GTX3076 land!

get rid of the GT35 altogether and get some response back for a near similar peak.

man we need some real results lol.

[luvpsi]

read my previous post on cams when in cmes to camshafts very interesting

[PWND]

280rwkw @ 20 sounds quite low

I am running 280rwkw @ 16psi with the same turbo

what nismoid said, rear housing, exhaust, plenum could be your issues. the rest of the gear you have on there should comfortable see you in the 300rwkw zone.

[joeyjoejoejuniorshabadoo]

you're gonna need bigger injectors too...

[bradsm87]

CAMS CAMS CAMS. Also turbo is way too big for that power level. Unnecessarily laggy.

[zebra]

Why cams? Been shown over and over again that they aren't needed.

[Tweaky]

I'm looking to achieve my results on 98 octane fuel , as E85 isn't yet available where i live. As far as i know the turbo housing is 0.80 for inlet & 0.82 for exhaust . The previous owner gave me a list of mods which were already done & that is what he wrote down for the turbo housings. This is my 1st import so knowledge bout these cars are not as good as the rest of u guys , so i'm still a novice with skylines. That's why i went to Performance place to get advice & suggestions on what needed to be changed with the car. I already knew i had a fair few illegal modifications , so that is what i concentrated on firstly . So my 1st visit was mostly fabrication work , a few little general tidy ups & a retune. The owner suggested next he would change the plenum( plazmaman or greedy ) , exhaust manifold ( custom made one with alot better flow ) & look at changing the Ecu. Apparently the Microtech aren't the best for street use cause the adjustments are to far apart & suggested something which u can fine tune more . He named a few brands which they do & think Vipec comes to name as one of them. That is why i wanted other skyline enthusiasts opinions , so i could get more imput from other people.

[DR 32R]

other than e85, Interesting to see you want to run 98. I'll be a loose cannon and say consistent 98 supplies can be just as tough to find in some regions as e85. I was struggling to get 95 yesterday for my f6. I'm going to say head porting, plus a valve spring upgrade. Lewis engines offers "affordable porting". I'm going with a formal flow tested port on my build.6 boost manifolds are nice.

Edited December 17, 2010 by WHITE gtt

[Tweaky]

other than e85, Interesting to see you want to run 98. I'll be a loose cannon and say consistent 98 supplies can be just as tough to find in some regions as e85. I was struggling to get 95 yesterday for my f6. I'm going to say head porting, plus a valve spring upgrade. Lewis engines offers "affordable porting". I'm going with a formal flow tested port on my build.6 boost manifolds are nice.

I was thinking bout putting it on E85 , but the closes pump station is at the Goldcoast , which is bout 1 hour 15 min drive for me. So was going to wait for a while till it comes down our way before converting over. Head work was also mentioned for better airflow , they also do that sort of work aswell or find a place in the Brisbane area which do it for them. Where do u get the 6 boost manifolds from ?

[PM-R33]

Ok if it is a .82 housing there is something definetely restricting it in making power.

I also ditched my Microtech LT12S and put in a Vipec V44; very happy with that descision (I got a good sale price for the Microtech and picked up the V44 for a great price so was a cheap upgrade) so definetely would suggest the same.

Don't bother touching the head at the moment, as that isn't where your problem lies. You could spend thousands on the head, and still net no gains in power due to the problem still being there.

Do you have a dyno graph to post up?

[zebra]

Are the injectors out of squirt being only 550s?

[TiTAN]

Are the injectors out of squirt being only 550s?

stock GTR 440's would get him just shy of/where he is now.

[Tweaky]

Ok if it is a .82 housing there is something definetely restricting it in making power.

I also ditched my Microtech LT12S and put in a Vipec V44; very happy with that descision (I got a good sale price for the Microtech and picked up the V44 for a great price so was a cheap upgrade) so definetely would suggest the same.

Don't bother touching the head at the moment, as that isn't where your problem lies. You could spend thousands on the head, and still net no gains in power due to the problem still being there.

Do you have a dyno graph to post up?

Low Boost 15psi - 250rwkw

High Boost 20psi - 280rwkw ( i reckon )

[Tweaky]

Low Boost 15psi - 250rwkw

High Boost 20psi - 280rwkw