T3/T4 turbos

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13-09-09, 19:52
wrinx

T3/T4 turbos

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
13-09-09, 19:57
wrinx

This is the one I'm looking at...only oil cooled though:

http://www.gt3turbo.com/Merchant/pro...cat=333&page=1

wrinx
14-09-09, 21:41
wrinx

Nobody...? :rolleyes:

wrinx
15-09-09, 05:18
na15575

gt28rs is the best fit i thing for 300-350 hp :bowdown:
with the very fast spool of her :D
15-09-09, 07:16
wrinx

Yes it is...but too expensive for me :(

wrinx
15-09-09, 17:44
Gery83

Quote:

Originally Posted by wrinx

Yes it is...but too expensive for me :(

wrinx

Here is a cheap one:

http://cgi.ebay.com/ebaymotors/GT28R...Q5fAccessories
15-09-09, 18:55
wrinx

Thanks...but $950 for a non-branded turbo :eek:

Think I'll stick with Garrett or similar ;)

wrinx
15-09-09, 19:00
Gery83

Quote:

Originally Posted by wrinx

Thanks...but $950 for a non-branded turbo :eek:

Think I'll stick with Garrett or similar ;)

wrinx

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

Quote:

Originally Posted by Gery83

$650

...plus the $299.95 shipping :cry:

wrinx
15-09-09, 21:01
1NRO

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/turbob...R_466541_4.htm
15-09-09, 23:15
wrinx

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
16-09-09, 21:52
wrinx

Ahh, found a useful page:

http://www.turbobygarrett.com/turbob...ison_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
18-09-09, 19:39
na15575

wrinx ?
you mean that garrett has gt28rs with T3 flance ?
is this one with the description "turbine housing option PN430609 230 "?
18-09-09, 19:47
wrinx

Here ya go, available with a T3 housing :cool:

But the price...!

UK - http://www.gt3turbo.com/Merchant/pro...cat=332&page=1
US - http://www.atpturbo.com/mm5/merchant...egory_Code=GRT

wrinx
18-09-09, 20:24
na15575

Quote:

Originally Posted by 1NRO

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/turbob...R_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 ?
18-09-09, 20:33
na15575

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
18-09-09, 21:51
1NRO

Quote:

Originally Posted by na15575

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.
18-09-09, 23:16
wrinx

Quote:

Originally Posted by na15575

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
19-09-09, 08:32
na15575

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
19-09-09, 10:48
wrinx

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
19-09-09, 18:17
1NRO

Quote:

Originally Posted by na15575

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
20-09-09, 15:14
SteveNZ

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.