4088r Vs T04z

[IMPORT CENTRAL]

hey guys im currently doing a new turbo setup on my gtr changing from the 685awhp twin td06 setup to either a single to4z or 4088r i would still like to make a tad over 600 at the wheels but need to speak to anyone running a 4088r i have a few people over in perth running the to4z but would like to see if the 4088r is more responsive and makes more power and what rpm the power falls of as we will rev it to 9200. i will list the spec and any info would be great the new setup will be with a 6 boost mani with large dump pipe

jun 2.7

280 cams

full jun built head

currently running twin td06 to 9900rpm

will run 9200 on the new setup just need to no if the 4088r like rpm as it seams the t04z might fall off

[Lithium]

There is a chap on some Skyline forums (might be on this one) called Rockabilly who runs a GT4094R and is running ~700hp on a GT4094R - the GT40xxR turbos on RBs is something I have been trying for ages to get good info on. There are plenty of EVOs out there running >600whp on them though, with impressively good response - the T04Z/T67BB/whatever people call them are "So pre-2005" these days haha.

Vid of FullRace showing off one of their GT40R setups.

[ahh 33 s2]

rockabilly is on hear with rb26/30 check the rb30 result thread.. he not reving that hard im pretty sure

[discopotato03]

Of the three you mention I'd give the GT4094R a big miss , basically a GT4088R with the GT4294R's compressor wheel and not surprisingly a poor combination with the 78T GT40 turbine .

Personally I think the GT4088R is a better unit mainly because it has more current wheel designs which is a bonus .

The T04Z's turbine (T04 P trim) probably dates back to the 1960's so a lot of engineering water has passed under the bridge since then .

There is a lot of variation in what gets called "T04Z" mainly with the turbine housing . A/R sizes all over the place and single or twin entry turbine housings in big T4 or smaller T3/twin T4 Euro flange sizes . I wouldn't even bother contemplating a T04Z with a single scroll turbine housing unless it was one of the three HKS ones .

You should really E mail Geoff Raicer at FullRace Motorsports in the US because he really likes and has had great success from GT4088R's and always says that if the engine/manifolds/turbo are properly set up they are not especially laggy .

Aside from just the wheel designs in this turbo both are significantly different trim size wise and that seems to make all the difference .

Garrett usually use the 84 trim size with their GT UHP turbines ie GT30/GT35 and the proyptype GT4088R did as well , at some stage they settled on a 78 trim size for the GT4088R and it also is available on the diesel GT37xxR turbos .

The compressor wheel design I believe was a first for Garrett and to me looks like typical GT blade form but with 7/14 blades instead of 6/12 and in a 52 trim size rather than the usual 56 trim size .

The T04R compressor wheel in the "T04Z" turbo is an older T series design and being 63 trim is dated thinking IMO compared to later petrol engine designs and even diesel engine designs .

Recently people have been looking at Holset and BW diesel turbos , often they use big wheels in smaller trims sizes than Garrett usually does with GT BB turbos but the downside at times is their massive housings .

Anyway speak to Geoff because he's played with RB26's and GT4088R's so he should be able to give you an idea of what to expect .

Cheers A .

Edited January 4, 2009 by discopotato03

[Lithium]

Of the three you mention I'd give the GT4094R a big miss , basically a GT4088R with the GT4294R's compressor wheel and not surprisingly a poor combination with the 78T GT40 turbine .

Isn't the 94mm compressor used in the GT4094R a lesser trim to the GT4294R, possibly making it a bit less of a "bad combination"? Something I find interesting is that the compressor maps I have seen for the GT4088R imply that it falls over quite a bit when you start going over PR ~2.5 or so yet there are cars making really good power on 30-40psi with them. Am I missing something?

I've trawelled through and for dyno plots of Supras (our closest equivalent that DO have plots for them) running GT40R and so far haven't seen any which stand over equivalent setups running GT3582Rs, whether its because no one has pushed them to their capabilities or if they just can't flow sufficiently to suit a big motor. Maybe someone has and needs to share their results still

Edited January 4, 2009 by Lithium

[discopotato03]

Yes that is true , the trim sizes are 52 and 56 .

Geoff had a post in Supraforums I think and he was doing comparisons of power outputs and turbine housing size on GT4088R's , I believe his findings were that using larger turbine housings was the way to male the power without high (40 psi) boost pressure .

I'm curious to know what sort of response is being asked for from this stretched RB27 .

Cheers A .

[2BNVS]

ive never had a 4088 so i cant compare but my garrett t04z 1.00 twin scroll 20psi from 3500 its great all the way to redline to make 450rwkw.. i dont see the big problem with it. this is on a 26/30 272 degree cams

Edited January 5, 2009 by 2BNVS

[Johnny]

When i was chatting to creatd ms, they showed me a single setup using the 4088 on an rb26 which was built for a good street car so its not very laggy at all and makes a nice 400kw atw.

Was considering this setup but for police hassle reasons im sticking to twins.

If you watch that HKS r34 gtr on youtube that runs a 2.8litre stroker, it seems to need alot of revs to get going....but top end made tsuchya scream.

[T04GTR]

a t04z will run out of puff.

check my comparo i found between a 4088 and a s374 borg warner....... im changing to one (s372r) a gt4294 or a combo gt4298r? or 4598r would be easy to get that power. but will be laggy.

[T04GTR]

i was supprised and sold at the same time....borg warner s374r vs gt4088r on 18pound rb26

[rockabilly]

i run a 4094r, rb26/30 jun stage one cams thats 264-in/272-ex with 9.7mm lift.spool rods and cp flat top pistons. acl bearings ,n1 oil/water pumps, car made 710bhp @ the fly with wastegate leak, put a second spring on and that sorted it, not dynoed it yet but will be doing in feb. car runs a .96 rear and makes 1bar by 3200rpm, makes full boost by 4000,wether it be 1.9 bar, or we have been as high as 2.7bar now. i think this turbo is awesome, and to compare it, i have have a rb26 with hks 25/30,s and an rb30 with a gt35r 1.06 rear, the 4094 spools faster for its size than the 35r and comes in only about 300rpm later. its an awesome turbo..you need to drive a 26/30 with one b4 its condenmed its awesome. bernie uk

p.s 710 @ the fly was @ 6800rpm.

Edited January 18, 2009 by rockabilly

[Drift Motorsport]

rockabilly - can you post a dyno graph? very intersted in these larger turbos for an RB26/30 drag build.

[SimonR32]

hey guys im currently doing a new turbo setup on my gtr changing from the 685awhp twin td06 setup to either a single to4z or 4088r i would still like to make a tad over 600 at the wheels but need to speak to anyone running a 4088r i have a few people over in perth running the to4z but would like to see if the 4088r is more responsive and makes more power and what rpm the power falls of as we will rev it to 9200. i will list the spec and any info would be great the new setup will be with a 6 boost mani with large dump pipe

jun 2.7

280 cams

full jun built head

currently running twin td06 to 9900rpm

will run 9200 on the new setup just need to no if the 4088r like rpm as it seams the t04z might fall off

ahhh dannny, finally seeing the light and ditching the old td06's

when ur car went on the dyno at motorvation both me and nattalotto looked at each other and said "we will keep our z's"

his made 627rwhp on dd and mine 575rwhp on dd... both had full boost in 4th gear by 4000rpm and mine was still making well over 550rwhp at 8500 and not dropping fast at all

id expect ur car to make easily over 650awhubber love power with awsome response with a z, no idea about the 4088r, everyone says they should be better but noone has a result

ps. blowing ur diff right infront of us was classic, i pissed myself laughing sorry

[T04GTR]

very impressive numbers.. i need to get valve springs..... stopped making power past 24psi and only 5hp differance from 22-24psi

[den001]

i have a .95 twin scroll 4088r goin on my 26, with 272 and big port work, will be done in approx 2 to 3 weeks, ill post up some info wen its dynoed

[IMPORT CENTRAL]

ahhh dannny, finally seeing the light and ditching the old td06's

when ur car went on the dyno at motorvation both me and nattalotto looked at each other and said "we will keep our z's"

his made 627rwhp on dd and mine 575rwhp on dd... both had full boost in 4th gear by 4000rpm and mine was still making well over 550rwhp at 8500 and not dropping fast at all

id expect ur car to make easily over 650awhubber love power with awsome response with a z, no idea about the 4088r, everyone says they should be better but noone has a result

ps. blowing ur diff right infront of us was classic, i pissed myself laughing sorry

yer sean pulled 3 degree of timing out of it the week b4 motorvation so it was down in power. yer im hoping for 650 at the hub with the setup thinking 2.7 280cams and asplit pulse setup should come on a little earlier and a tad more power the simons i hope but if i can get 650 at 1.8bar full boost 4500 i will be happy and only have to rev it to 9k instead of choking the shit out of it like i am atm.

blowing which car both ended blowing haha s15 twisted the tail shaft and gtr snapped halfshafts

[rockabilly]

rockabilly - can you post a dyno graph? very intersted in these larger turbos for an RB26/30 drag build.

as requested.

[Drift Motorsport]

Did the dyno guy back off the throttle between 4500rpm and 5500pm? Huge dip in power!

Or just as it was coming on full boost it hit surge?