GT30R or GT35R

[[SPESHAL]]

What one for a 2.5 litre? Want full boost (25 psi) around 4,000 rpm.

[McLOVIN]

I seriously doubt you're going to get what you want from either. Especially on a boxer engine.

[[SPESHAL]]

I have found out the GT30R will do what I want spool wise, ~3800 rpm, unsure about power wise, I think it will.

There is also this one....
http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GRT-TBO-020&Category_Code=GRT

[datsqik]

Have you had a look at the ITS range of turbos that grant is selling.They have a good range of comp wheels to suit your hp/boost/capacity requirements.These wheels are of the latest thin blade design and extensive hot cell testing has been carried out on matching comp covers to these wheels.They also have a good range of suitable turbine wheels that have been redesigned with less blades that come in various materials to suit extreme exhaust gas temps.These turbos can be ordered in dual ceramic ball bearing centres which are rebuildable and come with a warranty which i believe is something garrett is not offering anymore.There are some gtr's around perth using these turbos and from what ive been told they are working well and are still fairly responsive with 450rwhp.

[[SPESHAL]]

Yeah I was going to give Grant a ring on Tuesday. I was going to put a 60-1 on the 200SX, so I'll see what he can suggest. That was to replace a GT30... He said they were excellent turbo's.

[McLOVIN]

Anymore info on the GT3071R?

[[SPESHAL]]

Not yet, will let you know when I get a reply from ATP.

[datsqik]

From what i can gather the new Garrett GT3071R is very similar in size to the HKS GT2835 and i would expect it to give similar performance.Both comp wheels are 71mm 56 trim which is smaller than what we've seen in the gt30's available over the past few years.They seem to have gone for the smaller to4e style comp cover rather than that huge to4s thing.They are still using the standard gt30 turbine wheel which i believe is more suited to the smaller 71mm comp wheel.Its ashame that garrett havent relaesed a gt30 turbine wheel thats somewhere inbetween the current wheel and the turbine wheel thats used in the gt35 combined with the 76 mm comp wheel as this give the old gt30's the top end they should of had.
I would say that garrett have released this gt3071 to fill the gap between the curent line up of gt25/28 style turbos and the old gt30's.

[[SPESHAL]]

Looks like I will be getting an ITS 60-1. Certainly sound to be the goer over a GT30 or 35.

[McLOVIN]

So how would a GT3071R compare to something like a GT3037S? And what sort of boost threshold are we looking at for each of these on an SR20?

[datsqik]

Have a read of this bit i just found.It sort of confirms what i said about the gt30's having a missmatched comp/turbine.
http://www.atpturbo.com/root/releases/release052704.htm

[McLOVIN]

Looking at the dyno chart, the 3071R makes a bit more power and from lower in the rev range than the 3037S.

Might be something to look into in the future for myself.

[[SPESHAL]]

ATP weren't much help.

"Hello,

For 400 whp, the GT3071R should be okay, but it'll be a bit tougher. Spoolup should be awesome though. The GT3071R is a new turbo based on the GT30R built for high hp 4 cylinders and quicker spoolup. The GT30R should be fine.

ATP "

[McLOVIN]

Speak to someone local about it and see what they have to say.

[[SPESHAL]]

Ok 60-1 looks like it will be too laggy after speaking to someone using one on a similar setup - full boost @ 5000 rpm.

So this 3071 might be the go.

wlfpac - its a turbo Garrett only make for ATP I think, so chances of any info locally would be jack shit!

[datsqik]

I'm using a 60-1 ITS turbo with a stage 3 turbine wheel inside a .63 a/r housing on a SR20 which is getting 27psi at just under 4500rpm in 3rd.In 5th gear i can this boost a couple of hundred rpm less.Mine is a plain bearing version which spools later than the bb version.
What sort of power are you looking to make.

[[SPESHAL]]

True, maybe this guy just has a badly matched turbo or something - not sure.
I would like about 350-400 hp @ all four, just enough to do 11.5 @ 120 at least, and no more than 4000 rpm for full boost.

I have heard there were reliability issues with an ITS turbo on an R34 - how is yours holding up datsqik?

I don't see why an EJ would be laggier than an SR, especially the 2.5 litre.

Too many options and too many differing opinions :dizzy:

Your car and Ant's Datto seem to make similar power, him with the GT30R, and the Garrett is slightly cheaper I think. Why do you think the ITS is better?

[datsqik]

To get 400awhp you are going to need a 3" or bigger comp wheel which means you are going to have some lag. My pick would be a bb ITS with 60-1 comp and 10blade stage 5 turbine inside a .63 turbine housing. I havent had any dramas with my turbo but mine only uses ITS wheels inside some housings i had machined up.
The GT35 would also give you the hp but would be laggier.The 550hp gt30 would come close to giving you the power but they do fall over up top because of there small turbine wheel.

[[SPESHAL]]

Some lag is ok, but 4500 rpm plus on a 2.5 litre is, in my opinion, unacceptable.

I will have a dig around and a chat to a few people.

[McLOVIN]

I find it hard to believe the GT3071R would be an exclusive ATP product. Garrett have woken up to themselves lately in regards to this sort of thing with companies like HKS.You can now get Garrett turbos with near identical specs to their HKS equivalent,with the exception of the turbine housings which are designed by HKS. I might have a word to a Garrett dealer and see what they have to say.

As far as lag goes, you have actually seen an EJ exhaust manifold right? The runners are just too long to make it realistic to expect much low rpm response from these kinds of engines with large turbos. Subaru switched from a TD05 to TD04 because of lag issues on standard cars (no useable boost til over 3000rpm I believe), so even with an extra 500cc capacity, you're still going to have to deal with some lag with such a large turbo on a boxer engine. Unless you use asmall shot of nitrous of course.

[[SPESHAL]]

Thats just what I read on a US forum when I did a google search on Garrett GT3071.

Yeah that is a point.

[B0BB0]

riyaads rex, 2.2ltr, td06 25g isnt that laggy at all, but i have only been in it when it was on not much boost, now its making 400+hp @the wheels, and its said to still have more in it, slipping clutch was why they stopped, i couldnt tell u the rpm and so on, coz i havnt been in it for a while now, but next time i go in it, will will remember these details and let u know

[[SPESHAL]]

I know, but he also has some nice cams that help!

[B0BB0]

yeh he does, no reason why u cant :)

[[SPESHAL]]

No reason, except I'm like 50% over budget already :)

[[SPESHAL]]

Ok maybe 60-1 is the way to go :squint:

Similar setup over east made 360 kW @ all four with a 60-1 and pulled hard from 3000 rpm :boink:

[McLOVIN]

I've just been reading an MR2 forum and it appears the GT3071R is an ATP exclusive after all. Interesting indeed.

[onemxracer]

i know a 1jzgte 2.5 lt that has a gt30 r , made 25psi at 4000 rpm and got 397 rwhp , still more to be acheived .. i highly reccomend this gt30r

[[SPESHAL]]

I bought an ITS 60-1 dual ceramic ball bearing with stage 5 trim.

We'll see how this goes.