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wrinx
13-09-09, 19:52
Sorry to keep going on about turbos...:rolleyes:

I've decided on a T3/T4, so what spec is best for the Q4?

I've currently got stainless manifold, C&B medium street inlet cam and a Squadra chip (will be remapping one day!).

I was thinking the 60 trim but that seems to be for about 450bhp which is way more than I need....so 50?

Then, which compressor and turbine sizes would suit 300bhp target?

Read a lot about ball bearing turbos being much more responsive and faster spooling, but it there THAT much difference compared with a journal turbo, to warrant the ?300 increase!?

wrinx
wrinx
13-09-09, 19:57
This is the one I'm looking at...only oil cooled though:

http://www.gt3turbo.com/Merchant/product.php?productid=16147&cat=333&page=1

wrinx
wrinx
14-09-09, 21:41
Nobody...? :rolleyes:

wrinx
na15575
15-09-09, 05:18
gt28rs is the best fit i thing for 300-350 hp :bowdown:
with the very fast spool of her :D
wrinx
15-09-09, 07:16
Yes it is...but too expensive for me :(

wrinx
Gery83
15-09-09, 17:44
Yes it is...but too expensive for me :(

wrinx

Here is a cheap one:

http://cgi.ebay.com/ebaymotors/GT28RS-GT2860RS-Dual-Ball-Bearing-T25-Turbo-charger-IWG_W0QQcmdZViewItemQQ_trksidZp3286Q2ec0Q2em14QQha shZitem3a51bda99aQQitemZ250479487386QQptZMotorsQ5f CarQ5fTruckQ5fPartsQ5fAccessories
wrinx
15-09-09, 18:55
Thanks...but $950 for a non-branded turbo :eek:

Think I'll stick with Garrett or similar ;)

wrinx
Gery83
15-09-09, 19:00
Thanks...but $950 for a non-branded turbo :eek:

Think I'll stick with Garrett or similar ;)

wrinx


$650
But you're right. ;)
wrinx
15-09-09, 19:58
$650

...plus the $299.95 shipping :cry:

wrinx
1NRO
15-09-09, 21:01
Have you tried to do the maths on engine flow for a given boost pressure?

For a low (still high I know) 300bhp ish something along these lines will spool all day long on the standard engine but the manifold is a snag unless you modify it or buy one with the correct flange http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT25/GT2560R_466541_4.htm
wrinx
15-09-09, 23:15
Another GT :cry:

I tried to work out the flow maths but hit problems with a couple of things I'd never heard of :rolleyes::confused:

Ideal would be to get a T3/T4 to flow something like the GT series...not asking much is it :lol:

I could fit a T25/T28 but it would mean cutting the manifold and messing with the exhaust and other pipes to get things lined up again!

Much easier to stick a T3/T4 in there...

wrinx
wrinx
16-09-09, 21:52
Ahh, found a useful page:

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/turbo_comparison_sheet.htm

Kinda decided to go for a GT2860RS with a T3 outlet...the price is making me wince, will just have to bide my time and get some money together :roll:

wrinx
na15575
18-09-09, 19:39
wrinx ?
you mean that garrett has gt28rs with T3 flance ?
is this one with the description "turbine housing option PN430609 230 "?
wrinx
18-09-09, 19:47
Here ya go, available with a T3 housing :cool:

But the price...!

UK - http://www.gt3turbo.com/Merchant/product.php?productid=3&cat=332&page=1
US - http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Product_Code=GRT-TBO-004&Category_Code=GRT

wrinx
na15575
18-09-09, 20:24
Have you tried to do the maths on engine flow for a given boost pressure?

For a low (still high I know) 300bhp ish something along these lines will spool all day long on the standard engine but the manifold is a snag unless you modify it or buy one with the correct flange http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT25/GT2560R_466541_4.htm

sorry that i don't understand those lines exactly
you mean that the lines of this turbo are good for the engine flow?
when you say "will spool all day long " you mean that the turbo is never manage to go to the "operating" pressure ?
na15575
18-09-09, 20:33
yes but if this turbo is the best for you
and it is very reliable then it is not so expensive
i thing that 300euro more for something that it is going to work well is not to much
and you (we) don't need manifolds down pipes etc
1NRO
18-09-09, 21:51
sorry that i don't understand those lines exactly
you mean that the lines of this turbo are good for the engine flow?
when you say "will spool all day long " you mean that the turbo is never manage to go to the "operating" pressure ?

Thats about the sums of it, the engines normal flow is right in the sweet spot for most of it's range at a lower (300bhp ish) power level. it'll spool no problems and manage a decent level. Just means a hassle with the manifold flange and the intercooler plumbing but it' worth it imo for this power level target.
wrinx
18-09-09, 23:16
yes but if this turbo is the best for you
and it is very reliable then it is not so expensive
i thing that 300euro more for something that it is going to work well is not to much
and you (we) don't need manifolds down pipes etc

Yes, exactly how I'm thinking :)

I might have to wait a bit longer but it'll be worth it :)

wrinx
na15575
19-09-09, 08:32
thank you 1NRO
so this turbo is the best option for our cars
but with what A/R ?
can you give an idea to help us
i mean the GT28RS ok
wrinx
19-09-09, 10:48
Struggling to find the specs of the TB0367 but I think it's compressor .42 a/r and turbine .36 a/r.

GT2860RS is .62 and .64 so some trickery with pipes may be needed, but that's no problem really
1NRO
19-09-09, 18:17
thank you 1NRO
so this turbo is the best option for our cars
but with what A/R ?
can you give an idea to help us
i mean the GT28RS ok

I posted a link to the GT25 based turbo.

Not experienced enough to tell you which AR from the 28 range but to pick one I'd go for the middle one so a move either way can be made in the future if the need was felt.

Nik
SteveNZ
20-09-09, 15:14
I have used a fair few T3/4 hybrids. TO4E 50 trim is a pretty good comp. can flow big numbers, efficient at high boost and is not likley to surge. Go for a .64 turbine.

GT28RS with a T3 flange was the turbo I was always going to try if I went for a GT.