Gt35r Vs Garrett T04z - Discussion (just Post In This Thread To Create A Database)

[Strik3r]

Good job, I guessed your weight at 2800lb?s and put your run in the Power calculator and it came up at 560hp so the numbers sound right.

http://www.turbofast.com.au/Drag.html

Reasonable guide but remember its engine power. Im surprised just how close this has been.

unless he's using carbons bits, his wet weight (with fuel and driver) is more likely to be around 3100lbs..... (just over 1400kg's.)

EDIT: is this in a skyline ?? just read his sig mentioning an s13 in which case ignore the above :>

[SimonR32]

yeah stipped out queer spec s13

[Jap_Muscle]

hey guys how you all doin.

i was hoping for some advice since most of the power experts seem to gather in this thread.

just made 320kw @ 20psi on my rb26/30 but thats all it will make.

the heads completely stock apart from having some minor porting and polishing. gt35r, .82 rear, 6boost manifold, standard gtr plenum. some ppl have suggested valve float and to get new springs. i was just wondering if anyone had any other ideas before i take the plunge on the springs.

theres so many gt35r .82 users smashing 400kw on a rb30.....and i cant sleep at night knowing im not apart of that club lol

any thoughts much appreciated.

::edit::

after skipping though the thread a few more times i came across some stupid, premature and quite naive comments i made.

i dont think you realise what you are sayiung.

im telling you he did not make 400kw on a .8 gt35r

i guess i was just taking my poor build out on others and im sorry. i just hope those of you will forgive me and show me on the right path.

Thanks guys

Edited January 21, 2010 by Jap_Muscle

[R31Nismoid]

We told you months ago about the valve springs probably being the issue - still not tested i take it?

[Jap_Muscle]

We told you months ago about the valve springs probably being the issue - still not tested i take it?

hey ash,

no unfortunately i havnt. i just managed to save up 3k for a Nismo Super Coppermix clutch....and just put that into the car.

i just wanted to gauge any other thoughts on what the issue may be.

ive done a bit of reading on valve float and from what i understand its when the springs are not in contact with the cams or something right? if im running standard cams should this still be a problem? i thought this was only a issue when the cams are upgrading to bigger ones with bigger lifts?

getting a bit off track i know....but if anyone could entertain me just this once id really appreciate it.

[TiTAN]

its when you have too much boost and the springs are not able to hold the valves closed.

[Jap_Muscle]

how does one tell if his build is indeed suffering from this? is there something he can hear/see or read from dyno graphs? have any of you rb30 gt35r uses upgraded your springs?

lastly, should I be getting springs to match the standard cams or should I get a set of 265cams with matching springs ?

Edited January 21, 2010 by Jap_Muscle

[cactus]

Maybe someone get shed some light on my current set-up and the issues I am having...

Im running a built RB30 bottom end with standard 25 vct head. The old set-up was running a GT3082r (0.82r) with 6 boost and supporting mods and made 280rwkw @ 17psi. This is through a built 5speed auto, fully manualised with 4500rpm stall.

I then changed to a GT35R with the same mods. On 11psi, the car made 246rwkw @ 7100rpm. We then upped the boost to 18psi, however the car only went 260rwkw and stopped making power after 6000rpm (sharply).

Any ideas what this could be? A few people have mentioned valve float but I also dont know how to verify this.

[Angus Smart]

After the 18 pages or so i think its about time i needed to chime in on this thread,

i'm up in the air when it comes to turbo selection for my Built stock capacity Rb26, since i've not seen the motor yet i'd say i've had a fair bit of porting/head work done since i put in 270 cams and 11.2 lift..

now i am really up in the air on which turbo to choose. since i want some silly power but would like something responsive too. i guess this gtr's rev range is going to be alot higher up now with the cams. so anything under 3.54k isnt going to concern me. My old N1 high flows came on hard at 3 and pulled till 9 i may go back to them if i dont get the right single.

Gt35 seems right... but i wouldnt mind a bit more top end and they dont seem to go over well over 25psi according to a few here?

waiting on the results from the 3788r

and the 4088r might be right.. but could be a bit too doey down low and not even crack positive boost untill 5k

perhaps a different companys turbo should be on the cards? i've not even thought about the garrett to4z or hks equivalent but should i think about it?

And then on top of it all what rear housing? i'm guessing a .99 or 1.0 or something dew to my head flowing alot more. will be running split pulse too..?

every other aspect of the car should be up to the task, box, diff, fuel system, brakes, suspension.. but maybe not the driver haha.

[Lithium]

and the 4088r might be right.. but could be a bit too doey down low and not even crack positive boost untill 5k

perhaps a different companys turbo should be on the cards? i've not even thought about the garrett to4z or hks equivalent but should i think about it?

And then on top of it all what rear housing? i'm guessing a .99 or 1.0 or something dew to my head flowing alot more. will be running split pulse too..?

If I were going for a fast RB26 powered car and a GT35R wasn't going to cut it, I'd be running a .95a/r twin scroll GT4088R for sure. I'm hoping to catch up with a mate of mine this weekend who is running the same cams as you and a 1.06a/r GT4094R (should be quite a bit laggier than a 4088R) on his stock displacement RB26 and go for a jaunt in that.

Its only running 13psi at this stage, but I should be able to get a good impression of spool etc.

[Angus Smart]

Ah sweet, an update on that one in here would be greatly appreciated! my mate who works for a customs/exhaust shop keeps telling me to go bigger than the 35r and similar. i would love a 4088r however..

Cheers

Andrew

[TiTAN]

too much bigger than a 35R and on a standard capacity 26 the car will be no good for any circuit work as the power will be way too peaky leaving drag racing as about the only thing its suited for.

[Lithium]

too much bigger than a 35R and on a standard capacity 26 the car will be no good for any circuit work as the power will be way too peaky leaving drag racing as about the only thing its suited for.

The Mines R34 GTR is one of the best "street"/track monsters ever and that uses GT2530s which are more comparable with a GT4088R than a GT3582R in spool, imho.

[R31Nismoid]

The 4088 is what 800hp?

2530's are around what, 320-350hp or there abouts? Not quite the same league...

How i cringe when the ole Mines comparo gets thrown around....

Mines is running what... different diff's, superlight driveshafts, and i think different gearbox gearing.

Its more about what is going on behind the motor than what is attached to the side of it.

[Angus Smart]

too much bigger than a 35R and on a standard capacity 26 the car will be no good for any circuit work as the power will be way too peaky leaving drag racing as about the only thing its suited for.

270 11.2mm cams tho the rev/power range is going to be somewhat over 4-5k.. motor will rev to around 9500 or there abouts. big single might be the way to go i think.

The 4088 is what 800hp?

2530's are around what, 320-350hp or there abouts? Not quite the same league...

How i cringe when the ole Mines comparo gets thrown around....

Mines is running what... different diff's, superlight driveshafts, and i think different gearbox gearing.

Its more about what is going on behind the motor than what is attached to the side of it.

exactly. i am running c/r gearbox also and cf prop shaft, might change diff's too but thats up in the air.. i think the big single is going to be good.

From what i can gather these cars run t88 34d's and are circuit cars. and looks fun

a bit of playing around it looks like

This is a few quick laps from him

[Lithium]

The 4088 is what 800hp?

2530's are around what, 320-350hp or there abouts? Not quite the same league...

How i cringe when the ole Mines comparo gets thrown around....

Mines is running what... different diff's, superlight driveshafts, and i think different gearbox gearing.

Its more about what is going on behind the motor than what is attached to the side of it.

GT4088R is suited for 400-700hp, GT2530s are as you say 320-350hp x 2 = 640-700hp. You reckon that it sounds far fetched that GT2530s would be more comparable to a 700hp turbo setup than a 600hp one?

And before you jump up and down about it, I've driven cars with GT3582Rs and GT2530s and if you had a roll on from "the basement" in 1st gear between a GT3582R .82a/r single entry (let alone a TS one) and a twin GT2530 GTR, I'd happily bet a hunger buster combo that the GT35R GTR would be gone before the GT2530 setup was wound up so long as all else were equal.

In regards to the "How i cringe when the ole Mines comparo gets thrown around....

Mines is running what... different diff's, superlight driveshafts, and i think different gearbox gearing. Its more about what is going on behind the motor than what is attached to the side of it."... well yeah, of course - that was the point I was making. Despite what a lot of people seem to think - the power level and how soon it comes on is not the final word on how the car is going to perform on the track.

An early spooling turbo would make life easier, but realistically if you are going for real fast times then the odds are you'd be looking at more revs, aggressive gearing and hearty power levels. A GT40 based turbo + big cams moves the rev range up, but the working area of the rev range would monster your typical GT-SS setup - just will also be harder on the attached bits, including driver.

[R31Nismoid]

How can a compressor with 800hp of flow @ peak be suited to a 'range' of 400-700?

If you wanted 400hp, you would use a GT28, not a GT40

[Lithium]

Sorry I meant rated, hit Garrett up about the semantics as they are the ones who rated it to 400-700hp. GT4088Rs aren't as big and nasty as a lot of people seem to think... not that they aren't big and nasty, but

[TiTAN]

they also rate the 35r as a 600hp turbo yet people are making near 600hp at the wheels on them, i get the feeling they under estimate a little there

[R31Nismoid]

Only 600hp in a .63 rear for the GT35 i thought.

Otherwise they are 700hp (.82) or 750 (1.06) IIRC.

Rear end does have a bit of a day in overall proceedings... damn turbos