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

[SimonR32]

Cerbera's car has been parted out for about a year, so the T04Z run is a little old.

We're stumped as to why it's restricted. The only thing we can think is the head I'm using (off a 34 N1 motor) has a few imperfections in it which is causing turbulence. I'm using a china manifold, but the same type on Natalotto's car did 630hp with a T04Z. Exhaust is fine, intake is free, plenum is stock, cams are pretty big (270x10.8).

Disco, I'm using the GCG T04 rear for the 35. It's a T4 flanged 0.84 housing. I don't think the rear housing is the issue to be honest.

I would assume that a R34 N1 head stock would be better than or at least on par with my 89 shitter standard head, i'm still thinking it is the manifold. I remember back in the day Natalotto had heaps of problems with his china manifold and they did extensive modifications to it to get it working right. I dont know if Brockas has done anything to his?!?

I agree the boost is all over the shop, ramps hard then creeps and then falls over... which to me points at a manifold issue!!!

my t04z run is about 2 years old, still same dyno, same operator etc etc

[Brockas]

Manifold hasn't been touched yet. Simple china shitter ceramic coated and bolted on.

It has a gasket leak on the exhaust side anyways, so the manifold has to come off. May see about modifying it while its off.

[SimonR32]

if your going to pull it off, see if u can get a hold of nattalotto and have a look at his manifold!!! not like its going to be using it any time soon

[On Edge]

i was looking into the to4z with a 3litre bottom end on a 25, personally i think its a bit too large for track, big turbos tend to be slow on track cars, leave larger turbos to the drag racers is my advice. Go Hks GTSS, fantastic turbos for track and relatively tight courses....

[bubba]

I had the pleasure of driving a T04Z'd 25/30 in a 32 GTS4 a couple of weeks ago on the skidpan. Bit laggy compared to the GT30'd R33 I also got to drive, but, when it comes on boost.. HOLY SHIT.

Edited August 12, 2009 by bubba

[SimonR32]

I had the pleasure of driving a T04Z'd 25/30 in a 32 GTS4 a couple of weeks ago on the skidpan. Bit laggy compared to the GT30'd R33 I also got to drive, but, when it comes on boost.. HOLY SHIT.

that mikes new settup?!? how much power did he end up making?

[Butters]

Just got back from the workshop.

Compared my GT3582 setup (blue line) with a Cerbera's T04Z setup (green line), which were both run up on the same Dyno Dynamics dyno in shootout mode.

Not sure if Simon's had any issues, but my setup is strangled HARD in the top end. So much so, that adding 5psi and 2 degrees ignition timing gained me a whole 1hp up top. Did gain about 30hp through the mid range though, but I obviously have a large restriction in my inlet/exhaust which isn't allowing any more than 500hp flow.

Anyways, enough ricers excuses, here is the comparison:

Thats a perfect comparison.

You gain up to 60 hp more through the low - mid range. For a top end trade of of about 70hp.

I actually think you would find the two cars down the 1/4 would be very simular in times.

You have the big advantage though as your car would be more driveable on the street / track.

Be interesting to see once you have the issues sorted out.

How the top end power would compare on the same boost levels.

If you end up only trading 30 or so top end HP for a midrange gain of 60hp you will be well ahead.

[Brockas]

Yup, but after 6 months of the car being off the road, I'm not touching it again for a while, so will have to make do with that comparison.

If I get the motivation I will fork out for a 6boost manifold and see if that makes a difference.

The manifold is the cheap solution, the head is not so cheap. I'm hoping that with the boost dropping off, that indicates a manifold issue.

[SimonR32]

Thats a perfect comparison.

You gain up to 60 hp more through the low - mid range. For a top end trade of of about 70hp.

I actually think you would find the two cars down the 1/4 would be very simular in times.

You have the big advantage though as your car would be more driveable on the street / track.

Be interesting to see once you have the issues sorted out.

How the top end power would compare on the same boost levels.

If you end up only trading 30 or so top end HP for a midrange gain of 60hp you will be well ahead.

yeah 3.5-4.5k about a average of 35hp more but from 4.5-8k about a 50hp average more

i dont know what crack you have been smoking butters, but when do you have revs less than 4.5k down a quarter mile

i remember the difference in speed of my car on lowish boost (19psi 510rwhp) and high boost (24psi 574rwhp) was not even comparable... 510 was fvcking fast, 574 was just scary

[bubba]

that mikes new settup?!? how much power did he end up making?

Certainly is, it made 580hp @ the hubs on Allstars dyno.

[DCIEVE]

Reviving this one once again. Looking for some opinions on the following, given the choice of a 3582 1.06 twin scroll or the equivalent sized borg warner s300sx (83/75 I think) both on a proper twin scroll t4 flanged manifold - which would be the more responsive while aiming for ~500rwhp.

[SimonR32]

nick have a look at nytsky's engine build thread

he is using a 3076r on a built 25 and making 485rwhp with e85 and an amazing power curve, i'd imagine your motor could make a little more...

i would be thinking along the lines of a 3076r with a 1.0ish split rear

Edited October 27, 2009 by Cerbera

[Lithium]

Reviving this one once again. Looking for some opinions on the following, given the choice of a 3582 1.06 twin scroll or the equivalent sized borg warner s300sx (83/75 I think) both on a proper twin scroll t4 flanged manifold - which would be the more responsive while aiming for ~500rwhp.

I would be going for the TS Gt35R, definitely. I am not convinced on the BWs yet - they COULD be really good but there are contrasting results for them, while the GT35Rs are a very known quantity.

[GT-RZ]

still having trouble finding a split pulse 35r.... anyone got a link to somewhere that actually sells this model?

[DCIEVE]

That was going to be my next question, full race are the only ones I've found so far - and at 6-700 delivered (exh housing only) it's looking like buying a whole new turbo will end up cheaper.

Edited October 27, 2009 by DCIEVE

[juggernaut1]

Tried GCG?

[discopotato03]

You could try ATP in the US , I think GCG brings bits in from them at times .

A .

[DCIEVE]

Thanks gents, will check in with ATP. GCG informed me Garrett won't have stock till Jan next year.

[unique1]

i think a 3076r with a 1 housing would be pretty awesome suited as simon suggested. With correct setup in a lightweight r31 it would be nuts, mine seems to be abit better now with new exhuast and in a lighter car i could see it be pretty damn good (ill find out soon enough). Ill have to take you for a spin and show you how it goes and response and then u can decide for yourself and mine isnt even sorted properly. Surely a 450hp setup with awesome response would beat a 500hp setup with a fair bit more lag on a track.

[SimonR32]

on another note, the sloth (scradly) just made 430(allstarhubberlovehp) the other day on a stock neo with cams and a 3076r 0.82 with only around 17-18psi boost with awesome response

surely a built 26 with another 6psi could smash out 500+

DOOOOOOOOO IT