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

[R31Nismoid]

Holy cr*p can you? I actually struggle to believe that and I like to keep an open mind. I can help but figure you mean "high flowed stock turbos" as I have seen people do mid 11s on them but struggle to see it happen in a full weight GTR without spraying or something along those lines.

Oh yeah the cars I know of which have done 9s on GT35Rs are running 1.06 but are proper GT35Rs, not running 66mm compressor covers - and they are mostly Mitsis, but the point is they have to make good power and be able to pick up strong into each gear to do that.

No, a guy I know of. I can assure you stock turbos and the car was driven within an inch of its life... this was, maybe 5-6 years ago now

Could have been more than the usual 13psi though, not sure on that particular point

You see a lot of people get 12.0 or similar, they just like to keep their car in one piece so not milking the extra thats sitting there

[tommis85]

Wow! that makes me feel happy in my pants.. I'm only chasing 300rwkw to start with and hoping to make that at well under 1bar.. I know your head flows better but it still makes me all giddy

LOL @ "only chasing 300rwkw"

....sh]t man that would have to be in excess of 500hp at the crank!

[bubba]

LOL @ "only chasing 300rwkw"

....sh]t man that would have to be in excess of 500hp at the crank!

Yeah well only have standard rods at the moment and the setup should make 300rwkw easy got a 9psi spring for my gate so will get my tuner to start at 9psi and bump it up until it makes 300rwkw. The whole shebang should be good for ~400rwkw but I don't want to go there yet

[r33_racer]

Dont know, but i wouldnt want to try it without a restrictor,, I also never use those inline filters,,, if the motor runs a bearing I replace the oil feed line and restrictor as matter of course though... Cleaning the block's oil system when you build a motor is also critical

Really??

Since we fitted our inline filter, we have only ever saved turbos after engine blow ups.....

[SimonR32]

I wont be around till later in the year Jimmah should be there though? Pretty sure he's making a fair bit more than me with his 35r and in a drifter I'm thinking it'd be an interesting ride. I believe with traction it'd be a 130mph+ machine given sean reckons it has very similar top end to his rig.

I do value my life, im not sure that I am game enough to ride shotgun with that crazy man!!!

[tommis85]

Yeah well only have standard rods at the moment and the setup should make 300rwkw easy got a 9psi spring for my gate so will get my tuner to start at 9psi and bump it up until it makes 300rwkw. The whole shebang should be good for ~400rwkw but I don't want to go there yet

For about 5 seconds

What about your internals? ....ECU, pump, injectors and all that jazz too? Or have you done all that?

I think the RB26's block is rated at like 600hp or something but I'm not sure about the moving parts inside. I'm thinking that they'd be rated at a lot less or what?

...also, could someone please tell me what the maximum boost would be with a GT35r on a stock RB26? I'm yet to put in cams, injectors and pump and am wondering what the maximum boost would be prior to putting the other required upgrades in.

I'm thinking that with factory cams and fuel support system you wouldn't go over say 10 pounds with the larger flowing turbo???

Edited January 16, 2009 by tommis85

[bubba]

Wiseco forgies, N1 oil pump, 550cc injectors, z32 afm, 044 fuel pump, remapped stock ecu, stock RB25DE cams, custom forward facing plenum & Q45 throttlebody (plenum/throttlebody go on with turbo).

Srsly, it should do it without breaking a sweat and the driveline is all done too (except for clutch.. current button clutch should be fine on the street but if I wanted to throw some slicks on and take it down the strip.. or drop 4th gear standstills.. I'll probably need to go multiplate!).

[T04GTR]

Hmmm the general consensus seams to be pro-T04z

For those of you who may not know - I'm deciding between a:

GT3076r (probably the best size but limited for the amount of money spent)

GT3582r (the next best size, but descibed as "boring" by more than one person. Loses too many RPM at gearshifts etc....etc)

....and the mighty T04z (possibly too big for my hp goal but described as fun and exciting lol)

For a maximum horsepower goal of around 450-500 at the treads. That maximum figure will be reached later on down the track as I don't have the biggest budget so for the time being it will probably be no more than 400 or so. For my power goal the GT35r seams to be ideal however everyone (including my tuner) describes it as "boring".

Decisions decisions

HELP!!!

ok, when i put my t04z on my car. (bog stock except ecu etc etc and a 3.5" exhaust) it made 315awkw on 1.4 bar.

i replaced that motor with one that had mild headwork and 260 poncams. it made 375 awkw on 1.6 bar.

annas car has little 252 poncams and only a mild exhaust port clean up. she made 345 rwkw on 1.5bar. (320rwkw on every dyno but the one it was tuned....)

so from what i can gather cams and headwork are paramount to making good power.. except for the odd car that makes retarded power compared to everyone else lol..

so if you are not planing to do headwork or atlest cams and still want good power id get the t04z. you wont be dissapointed. if you get a 35 you will get tired of it. just like anna did. (only took a few months )

so.

[T04GTR]

and another thing. why do people run a "oil restrictor" in the oil line for a gt35 (or any other garrett bb) when the restrictor is in the oil fitting in the turbo.......

[DCIEVE]

After wiring in my ecu and getting the car running my tuner told me to piss of and install some cams before doing the final tune - he essentially said the 35r is very lazy in the mid-range and needs some drop in cams to wake it up. Basically I'd regret tuning it without the cams...

[bubba]

Anyone know how RB25DE cams differ from RB25DET? I remember seeing a list of stock cam specs on here a while ago but can't for the life of me find them

Upgraded cams is a 2.5k excercise I can't justify/afford yet

[wrxkilla]

ps Tommi,

I'm at QR with my 35R on January 27th TimeAttack, so feel free to come out and I'll see if you can go for a passenger lap...

[tommis85]

Sounds good Michael....I'll see if I can get down there. They usually have the passenger round for the last thing of the day don't they?

[T04GTR]

bit of an update for you guys.

just put a t04z .84a/r split rear on annas 33. was a gt35 with .63a/r it is a good 500rpm laggier. (on hard at 4500. builds boost from 3k but ramps up hard from 4300. where as before it was very smooth. tune not changed and a quick mock up steam pipe manifold. (did have a 6 boost on the gt35)

has a 3.5" dump going sharply down to 3" at the cat entry and has not been tuned up yet. (waiting for new 6 boost and proper 3.5" zorst)

on 5 pound less its much more angry. she loves it. but once its tuned up it will be a tru back to back except for a 3.5" exhaust. so stay tuned

but from what i can say, it is significantly laggier on this particular engine thus far. but will have to wait and see. (refer above)

[sky30]

GcG turbos told me the TO4z would be around 800rpm lagier than my current GT35 set up, they said they have sold a fair number of them so i would guess they know what there on about.

[Lithium]

just put a t04z .84a/r split rear on annas 33. was a gt35 with .63a/r it is a good 500rpm laggier. (on hard at 4500. builds boost from 3k but ramps up hard from 4300. where as before it was very smooth. tune not changed and a quick mock up steam pipe manifold. (did have a 6 boost on the gt35)

has a 3.5" dump going sharply down to 3" at the cat entry and has not been tuned up yet. (waiting for new 6 boost and proper 3.5" zorst)

Do you have a before dyno plot from when it had the GT35? Will you provide an after when it has? It will be perfect for answering everyones current (and a lot of peoples future) questions if you can do an overlay of a .63 GT35R with a T04Z. The .63s aren't really as good as the .82s for a RB imho, but it will definitely give a real idea. "Smooth" definitely usually indicates a better power delivery.... coming on hard late is brilliant for making a car feel twice as fast as it is

[tommis85]

Would it be the smallish rear end A/R of the 35 that makes it feel smooth? It'd start spooling pretty early compared to a 35 with a .82 end....giving it a much smoother feel.

[Lithium]

The .82 is pretty smooth too, on a 26 in my experience. Probably more to do with the fact the GT35 starts "windmilling" earlier than the T04Z and the build up onto boost is more progressive and generally earlier. If you have something that comes on and builds its boost later in the rev range it becomes much more noticeable as the later in the revs the torque ramps up, the more aggressively the power will ramp up and as such the more violent the power delivery. Most people notice (/ are more blown away by) change in acceleration moreso than outright acceleration, so cars with this ramp up in torque later in the revs generally feel much faster even if they aren't. Try cruising along at 4000-4500rpm in a car with a not laggy turbo and feed your foot down to full throttle at a firm steady pace (maybe over .5s?), vs stomping the foot down at the same revs. Some people will find the "feed down" method more dramatic despite the fact it would be left behind by the "stomp" method...

[tommis85]

I think I can make sense of that. The T04z must come on with quite a thump indeed as my mates GT35 r33 gtst came on with quite a lurch as well.....nothing......nothing....nothing....and then, at the last second....BAM! and we have 17 inches I mean...pounds!

I guess I'll just have to see how Michael's GT35 R32 goes at QR.

I think it also depends on how many pounds you boost. I think, if you ran 20+ pounds on a GT35 and make 400+ horses.....well, I think that would hit you quite hard too or what? But yes, I'm thinking that 10-14 pounds on a GT35 would be quite progressive depending on how you're driving.

Edited January 21, 2009 by tommis85

[T04GTR]

yeah i will overlay it when its tuned. just search "msnismo" in rb25 turbo upgrades....