Yet Another Turbo Thread

[SafT]

I have both options sitting here, engine is still 2.6l (built bottom end).

Has 280 11.35 cams, and ported head.

Which would you choose, and why?

Thanks

EDIT: the 2540's are used, but in reasonable condition, gt4088r is new

Edited March 17, 2009 by SafT

[Lithium]

Has 280 11.35 cams, and ported head.

Which would you choose, and why?

Use the GT2540s, give the GT4088R to me... I won't fluff around making my mind up, I'd just put it on because someone bloody has to

[xsv_32]

Go for the big single, you cant pass up that sound of spooling. You may lose a bit of drivability but when boost hits you'll know about it.

[discopotato03]

I don't think theres a lot thats good to say about HKSs 2540s , except the turbine housings are good and fit 2871Rs and any GT28BB turbo with the NS111 turbine .

2540s are laggy because 1) the compressor is an out dated 76mm T04E I think 46 trim , 2) any 76mm compressor is too big for a 53.84mm turbine .

GT4088Rs are a reasonably serious turbocharger and even with a properly set up pulse divided manifold and twin gates I don't think would be real responsive on a mainly street driven car .

For pure street in twin layout a better choice IMO would be between GTSSs (which you can buy through Garrett at a Garrett price) and a GT2530 or Garrett marketed version .

My thoughts only , cheers A .

[R31Nismoid]

ugh 2540s

filthy turbos mate, not much more power than 2530's, but a noticeable amount of lag.

They were the worst turbo offering from HKS... hence you always see people in For Sale never selling them, or selling then for next to nothing as they are a 'hot potato' of sorts

GT4088 or 2530's/Garrett -5s

[N1GTR]

Go the single

[SafT]

The single manifold i have is a Trust divided entry, single 48mm gate.

[SimonR32]

T04Z 0.84 split rear

you wont look back, cept for the in the rear vision mirror for the gtr's with low mounts

ps. those are very big cams for street

[den001]

T04Z 0.84 split rear

you wont look back, cept for the in the rear vision mirror for the gtr's with low mounts

ps. those are very big cams for street

sorry bud, but i was going the same path as u and have to disagree...

i have gone a gt4088r .95 split, purley coz the t04z is based on a old truck turbo from the 80's

4088r is a performance turbo, i have one on my full built 26

[SimonR32]

sorry bud, but i was going the same path as u and have to disagree...

i have gone a gt4088r .95 split, purley coz the t04z is based on a old truck turbo from the 80's

4088r is a performance turbo, i have one on my full built 26

keen to compare your graph with the one from a "old truck turbo from the 80's"

old doesnt mean bad

rb26 are cast iron truck motors from the 80's so they marry well with the old skool Z

Edited March 17, 2009 by Cerbera

[den001]

mine is not dynoed yet but in saying that, croyden think it will crack 650rwhp on about 22 to 24 psi, in a s15

also i know how much u made, i even envy you mates, r32gts with his dyno sheet, thats a fat curve and would be a weapon to drive no doubt.. i wanted to go t04z for that reason, but croydon said to go for the 4088r setup as its more of a modern turbocharger....

i know they make the power but the 4088r is slightly better, im not 100% sure but i trust croydon has thier reasons...

Edited March 17, 2009 by den001

[Lithium]

keen to compare your graph with the one from a "old truck turbo from the 80's"

old doesnt mean bad

rb26 are cast iron truck motors from the 80's so they marry well with the old skool Z

Yeah I agree with the old not meaning bad sentiment, and on paper I overall prefer the GT4088R though I have to admit that the only car I have been going in which had a T04Z on it blew me away.... once it was on steam (quite early, more so than the dyno could suggest) it was incredibly responsive and generally grunty.

I have been wanting to see how a GT4088R (I will do it eventually if possible) runs on an RB but on paper they look like a fine piece of work. Saft knows I am chomping at the bit to see one going and is surely aware he is teasing me by doing this, even though I think 11.35mm lift 280deg cams are probably overkill for such a setup. Whatever happened to the 272 setup you initially mentioned, man?

Some of the Supra circles are starting to convert from PT67-DBB type setups (ie, T04Z) to GT4088Rs on .95 and 1.06a/r turbine housings and are finding the cars much more fun/pleasant to drive. The power results sound like they come out much of a muchness however, and the main cases where the T04Zs get the nod is the fact that they are a little cheaper.

Saft actually has the GT4088R in his hot little hand, so aside from the crazy cams I think its the obvious choice. In all honesty I don't think a 280/11.35deg cam with any turbo setup is going to make for the most lovely street car, unless by street car you mean you intend on coming down to Palmy to do some laps of the square and confuse the rotor skanks

[den001]

don't worry Mr Lith, hopefully in the next few weeks i will be able to lay my setup down with some figures after the run-in period, i also have a 272 setup...

[N1GTR]

Oh this is getting good

[Lithium]

don't worry Mr Lith, hopefully in the next few weeks i will be able to lay my setup down with some figures after the run-in period, i also have a 272 setup...

You make me happy

[den001]

You make me happy

id make myself happy if the car was finally finished

[bigmikespec]

Oh this is getting good

What would make it more gooder would be to have a Borg Warner equivalent to compare...

[SimonR32]

mine is not dynoed yet but in saying that, croyden think it will crack 650rwhp on about 22 to 24 psi, in a s15

also i know how much u made, i even envy you mates, r32gts with his dyno sheet, thats a fat curve and would be a weapon to drive no doubt.. i wanted to go t04z for that reason, but croydon said to go for the 4088r setup as its more of a modern turbocharger....

i know they make the power but the 4088r is slightly better, im not 100% sure but i trust croydon has thier reasons...

dont get me wrong, would love to see the 4088r do better than a t04z, then ill use one next time i get around to trying to make big power!!!

just i dont agree that old is always not as good, the 4088r graphs i have seen have been laggy and not made that much power!

yours will be great to see for a comparison

Edited March 18, 2009 by Cerbera

[Lithium]

dont get me wrong, would love to see the 4088r do better than a t04z, then ill use one next time i get around to trying to make big power!!!

just i dont agree that old is always not as good, the 4088r graphs i have seen have been laggy and not made that much power!

Care to share any? I've seen hardly any GT4088R dyno results on RBs, the only RB26 one I have seen was on one running a completely stock RB26 in an R32 GTRc and the spool wasn't too bad considering. If I remember rightly it was up around 25psi by 4700rpm and the car ran in the high 10s at over 130mph.

[den001]

dont get me wrong, would love to see the 4088r do better than a t04z, then ill use one next time i get around to trying to make big power!!!

just i dont agree that old is always not as good, the 4088r graphs i have seen have been laggy and not made that much power!

yours will be great to see for a comparison

i wasnt saying that old wasnt as good, obviously you and many others have proven that the t04z packs the goods, i was just stating that it is a old design turbocharger....