Turbonetics Gtk Series

[phunky_monkey]

Hey all, just wondering if anyone has had any experience with GTK500/550/650 turbos by any chance?

I've heard mixed reports about quality, but I'm interested to find out anyones first hand experiences.

Cheers,

Dane

[STATUS]

what engine i can pull up some runs for you. I have heard mixed results on reliabilty but thats the case with everything i suppose. I think ive had 3 or 4 through two on sr's and they were pretty good for top end power but i remmber the sr20 one with gtk550 made 380rwkw but hit boost at 5800 or something stupid....

[phunky_monkey]

Wow, 5800 is a bit rich! If you wouldn't mind posting some up Trent it would be greatly appreciated.

It's would be on a SR22 with 90mm bore and 272/11.5 cams, 0.5/1mm oversized valves and CPC 1 piece plenum.

[discopotato03]

I think the T in GTK might be worth a closer look at the turbine and compressor wheels , T series stuff is getting a little long in the tooth for many true petrol performance apps .

I would have thought that something from the Garrett GT ball bearing range would be better for a two litre four - even a big bore one .

What sort of power are you looking to crank out of your engine ?

A .

[phunky_monkey]

That is the way I'm leaning at the moment, but it was just a thought that crossed my mind and I'm interested in finding out about all options prior to making a decision.

At the moment the main contender is a Twin scroll 3071R/3076R kit, T67 8cm or a Tial housed 3071/6 on a steam pipe manifold. The car is a circuit car, so I'm looking for a wide power band and potential to make at least 300rwkw's (have to make it worth my while going from the HKS T300 on it now).

Dane

[juggernaut1]

I think you could throw a TDO6 L2 in the list of potential turbos too for your power output.

Although I do like the twin scroll turbo setups as they exhibit a more linear power curve than some turbo seups which will potentially result in a faster circuit car.

[phunky_monkey]

Yeah I considered the L2, but feel it may be a touch restrictive. If I'm going to go the high mounted Trust option then I think I'd go the 67.

[tets]

i have a gtk 550 sitting in my garage if u want it.

plans keep on changing and its been collecting dust for ages LOL.

[discopotato03]

You don't reckon 300Kw is a bit much from a 2L based four for track ? I'd be concerned that the power would be peaky and the usable rev range a bit narrow for most circuits .

Not cheap but have you considered a GT2835 Pro S turbo ? The cropped GT30 turbine is fine as long as its in a GT30 based turbine housing which unfortunately only HKS make . Actually if you could rat up a T3 flanged Po S turbine housing the cartridge HKS uses can be bought through Garrett and on a four cylinder it shouldn't surge so possibly don't need HKS's compressor housing either .

Anyway your call but you need to have power out of the slowest parts of the track as as wide a usable rev range as possible . Also peaky short power ranges force you to use expensive close ratio gear sets to stay on the boil .

Controllable usable power you can get to the ground , better I think than a high peak number .

Cheers A .

Also you call but I wouldn't use anything less than the early head and the GTiR quad throttles , throttle response and least restriction throttling is everything for track .

[phunky_monkey]

Tets: Thanks, will see how I go mate.

Disco: Thanks for the tips. I'm not necessarily after 300rwkw's straight up, but to be honest with the money I've spent on this car I want to have a window to increase power to a level that makes the build worth my while. I was running 240rwkw's for years on the stock engine, and I don't believe a 20-30rwkw gain is not enough for me to bother changing setups. At the moment it's ramping up to power in the mid 3's, and so long as I have a 3500rpm band of power that's fine. I'd prefer a 4000rpm window ideally. I do know what you mean though, and on my current turbo setup with the stock bottom end I was caught between gears at Winton quite a lot.

I'm going to be trying my T300 out initially to see how it goes (hasn't had a full tune yet due to a few issues), but if I'm unhappy with it I want to move quite quickly on a new setup to take advantage of the good state of our dollar. Throttle response with the CPC plenum and 80mm TB seems fine for the moment, and it's an S13 head. Throttle response is the main reason I'm thinking of going the Full race twin scroll setup.

To help understand my thinking, the reason I'm contemplating this prior to tuning the current setup is because my HKS SS manifold can't take the heat of the track, and has cracked a few times. Therefore I need to purchase a new steam pipe manifold, and don't want to do this for a setup that I may want to change shortly. So best for me to work it out and only purchase what I really want, as I've spent money on turbo setups over the years!

Thanks for the 2835 suggestion too. The Pro S is internally gates isn't it?

[juggernaut1]

You don't reckon 300Kw is a bit much from a 2L based four for track ? I'd be concerned that the power would be peaky and the usable rev range a bit narrow for most circuits .

Disco, the Evo that took out the last Super Lap had something like 550rwhp - OK I realise its 4wd - but who would of thought a TO4Z strapped to an Evo motor would be a force on a circuit and actually bettered Mark Berry's new R34 by about a second from memory .....ahh yes the EVO had a Full-Race twin scroll manifold tho'.

Also Dane's is stroked to 2.2.

Edited October 16, 2009 by juggernaut1

[T04GTR]

i was going to get a gtk. but through hours of searching on the net in the us, i didnt get one.

seems the fancy comp housing and relativly small exhaust housings are a restriction,

something in the reigon of 60-65mm inducer will do.

its either garrett or borg-warner/bullseye

ive had a thrust bearing go on a tdo6 not sure how much stronger the l2 version is but.

[phunky_monkey]

Thanks Dave.

Full race are going to be testing out the Borgwarner twin scroll turbo's soon enough I think, which is another option right at the top of my list. Just not sure when the results will be available though, but may be worth the wait from what I'm told.

[T04GTR]

s256 vs gt3582r

bullseye power s256

a good comparison

gt35 vs borg warner

[phunky_monkey]

Yeah I read the GT35 vs BW the other day and it's pretty promising. They're also a fair whack cheaper than the Garret stuff, and seem to work as well if not better in a lot of cases.

This is the turbo that might be looking like a bit of a winner according to Full Race:

[STATUS]

L2 is good for 300rwkw on a track weapon no worries at about 20psi.

Here is the GTK550 @ 25psi (this is the only graph i have on this computer) this is about 40rwkw shy of its potential because the fuel system was not adequate so i had to dumb it down. I reckon its the worst turbo i've seen on a sr to date but on a rb26/30 id be happy.

Edited October 16, 2009 by URAS

[STATUS]

L2 graphs on 2 liter, only ran it to 7300 as engine was only a hour old and the box was noisy (std sr box0, should make power to 8200.

18psi 272deg cams big lift, engine built by us.

We should be able to crank up the boost in the next few weeks, i predict 340-355rwkw ish at 1.5 on pulp.

Edited October 16, 2009 by URAS

[juggernaut1]

GTK 550.....full boost at 6000rpm.....90rwks by 5000rpm and then hang on!!

Edited October 16, 2009 by juggernaut1

[STATUS]

L2 on std SR20 with HKS 264 in and ex, std valve springs, ikeya formula 4 tb plenum.

300rwkw on a fairly "fat" tune (less timing and 11.8afr) as engine was std. i would expect to see another 20rwkw easy in that car at the same boost, cams were a bit small too.. and springs were borderline rpm wise.

Edited October 16, 2009 by URAS

[tets]

gtk on sr loll

u sure it wasnt a civic?