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

Tomek

By Tomek,
in Engines & Forced Induction

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Duncan1 Rising Star

Duncan1

Posted
Posted
my t04z is a split pulse t4 flange - same as the GT3788. The 4088R is a bigger turbo than the T04Z (compressor and turbine) so it will flow more HP, with a tiny bit more lag.

Main reason for doing the swap is simply that the Z is too doughy out of medium tight corners around the track. IE: turns 3/4 @ QR I take at about 80km/hr. 2nd gear == massive tailslide on exit, whilst 3rd gear == LAG all the way out of the corner. Hopefully the new turbo is not only slightly more responsive, but a lot more linear in power delivery. I make 1 bar at 4100rpm with the Z and 24psi at 4500. Thats not too laggy, but as soon as you go below 4000 rpm there is absolutely nothing there. I wouldnt care too much if the 3788 only makes 1 bar at 4000rpm as long as 3800/3900 still had SOMETHING available unlike the Z which comes on like a lightswitch once you get over 4.

The only unfortuante thing is that I wont be able to directly compare how the 2 turbo's would have worked on the track as I'm making some other significant changes to the car at the same time. So wont be able to say if the 3788 is soley responsible for better lap times, but hopefully combined with everything else we are doing it makes a big difference.

Still probably a couple of weeks away from doing the swap - will see how we go.

What else are you doing mate!?!?!!?!?!?

Is it going to be ready for the 11th?

We are going to run high boost on the T04z this time and see what we can times we can squeeze out of it.

Hopefully the new balancer will keep all the belts on the car unlike last times sad effort!

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R31Nismoid
R31Nismoid

No doubt they are animals, but when response counts (if the courses are indeed as tight as above) then you really want -7/GT30 style setups for max response, you'll be faster that way

unique1
unique1

t04z too laggy for any track work unless its a big open circuit event and u like keeping it above 4500rpm all day, even the gt3540 ive seen isnt that much nicer response wise. If u plan any sort of mo

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Duncan1 Rising Star

Duncan1

Posted
Posted
#### Couldnt edit my first abortion of a sentence.

this should make more sense

What else are you doing mate!?!?!!?!?!?

Is it going to be ready for the 11th?

We are going to run high boost on the T04z this time and see what times we can squeeze out of it.

Hopefully the new balancer will keep all the belts on the car unlike last times sad effort!

Strik3r Experienced

Strik3r

Posted
Posted
What else are you doing mate!?!?!!?!?!?

Is it going to be ready for the 11th?

We are going to run high boost on the T04z this time and see what we can times we can squeeze out of it.

Hopefully the new balancer will keep all the belts on the car unlike last times sad effort!

Oh few bits and pieces. Got some softer suspension going in as the 12kg springs that were on there were way to hard. The car will definitely be there on the 11th even if i have to push the damn thing around the track :D

hopefully catcha then ! Look forward to seeing what you can do with the good ole Z :P

Duncan1 Rising Star

Duncan1

Posted
Posted
Oh few bits and pieces. Got some softer suspension going in as the 12kg springs that were on there were way to hard. The car will definitely be there on the 11th even if i have to push the damn thing around the track :banana:

hopefully catcha then ! Look forward to seeing what you can do with the good ole Z :P

Nice mate,

Looking forward to seeing your new setup in action!

Lithium Grand Master

Lithium

Posted
Posted
The 4088R is a bigger turbo than the T04Z (compressor and turbine) so it will flow more HP, with a tiny bit more lag.

I make 1 bar at 4100rpm with the Z and 24psi at 4500. Thats not too laggy, but as soon as you go below 4000 rpm there is absolutely nothing there. I wouldnt care too much if the 3788 only makes 1 bar at 4000rpm as long as 3800/3900 still had SOMETHING available unlike the Z which comes on like a lightswitch once you get over 4.

Wont be able to say if the 3788 is soley responsible for better lap times, but hopefully combined with everything else we are doing it makes a big difference.

Are you running an RB30? 1bar at 4100rpm isn't that bad :thumbsup:

Strictly speaking the GT4088R isn't really a bigger turbo than the T04Z, the T04Z has a bigger compressor which wants to flow a bit more air - the Supra guys in the States and the UK seem to be increasingly moving from the T04Z to the GT4088R as the fun 700+ish turbo to have, the GT4088R is apparently more useable and generally fun.

Look forward to hearing how the GT3788R treats you, I've never heard of one used on a petrol motor.

SimonR32 Grand Master

SimonR32

Posted
Posted
Are you running an RB30? 1bar at 4100rpm isn't that bad :thumbsup:

sounds like rb26 response.... in 4th gear on a flat road loading up the motor i was getting 1bar around 3700rpm on my stock capacity rb26

Butters Experienced

Butters

Posted
Posted

Smoking Crack whilst driving helps Cerbera think the boost is coming on sooner.

Also Cerbs .... 139mph last night with a GT35 !!

ANDRA guy got angry and told me to get a chute ..... jeeeeeez never ends !

N I B Grand Master

N I B

Posted
Posted

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.

ahh 33 s2 Mentor

ahh 33 s2

Posted
Posted (edited)

dam id love to see a skyline run 139 at the plex, where are u getting ur E85 from in perth?

silvia even

Edited by ahh 33 s2
Butters Experienced

Butters

Posted
Posted

Running 1000cc injectors and low rail pressure. It gets to 90%.

Not sure how the pump would fair on higher rail pressure but in theory a lot more injector available.

Strik3r Experienced

Strik3r

Posted
Posted
Are you running an RB30? 1bar at 4100rpm isn't that bad :P

Strictly speaking the GT4088R isn't really a bigger turbo than the T04Z, the T04Z has a bigger compressor which wants to flow a bit more air - the Supra guys in the States and the UK seem to be increasingly moving from the T04Z to the GT4088R as the fun 700+ish turbo to have, the GT4088R is apparently more useable and generally fun.

Look forward to hearing how the GT3788R treats you, I've never heard of one used on a petrol motor.

Yea, the compressors of the 2 turbo's are fairly similar in the scheme of things ->

TO4Z

Inducer 66.7mm

Exducer 84.0mm

Turbine: 74.2mm

4088R

Inducer 63.5mm

Exducer 88.0mm

Turbine: 77.0mm

Doesn't the exducer determine how much air it can flow ? People seem to be getting a bit more HP out of the 4088's than the Z's.. the fin design of the new garrett turbo's is more efficient than the older Z's.

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