T4 turbo

[97 30th RS]

I just got a T4 from ebay last night. I am having the same guy build me turbo headers as Phoenix 64 since I live in MN also. Anyway the turbo looks pretty big. 4" inlet 2.5" outlet, and it has a .96 ar. It is a straight T4, not a T3/T4 or a To4E. Is it too big to use on our motor?? [img]graemlins/burnout.gif[/img]

[97 30th RS]

here it is

http://cgi.ebay.com/ebaymotors/ws/eB...MakeTrack=true

cut and paste

[Teufel Hunden]

The turbo itself is fine, but with that size exhaust side, the turbo will be very lazy, and will not spool quickly at all. You're going to need to look into a smaller one to get any kind of decent performance.

[Turbo Kyle]

Originally posted by Teufel Hunden:
The turbo itself is fine, but with that size exhaust side, the turbo will be very lazy, and will not spool quickly at all. You're going to need to look into a smaller one to get any kind of decent performance.

Yep,
What he said that exhaust A/R looks too big. Not a bad deal for 100 bucks though

[Teufel Hunden]

Yeah, for $100 i would have bought it too. A new housing will likely cost you in the $200 range, but at $300 total, it's still not a bad price.

[GN-T66]

Stay with a T4 flange on the exhaust side (you can get as small as .70 AR on an exhaust housing and still have a T4 flange). This will leave you with more options and easier upgradeability in the future if you need to go bigger with the turbo.

[nocutt]

Stay with a T4 flange on the exhaust side (you can get as small as .70 AR on an exhaust housing and still have a T4 flange). This will leave you with more options and easier upgradeability in the future if you need to go bigger with the turbo.

Agree!! Ebay is your friend [img]graemlins/naughty.gif[/img]
.68-.70 will be very streetable and still keep the topend pretty strong...nice fine BTW!!
good luck!

[97 30th RS]

Thanks for the input. Now of course it will be a lazy *** turbo, but hopefully some fuel tuning and increased rpms should knock some lag off. I may as well pull the heads and manifold off and get those ported and everything.

[Teufel Hunden]

Originally posted by 97 30th RS:
Thanks for the input. Now of course it will be a lazy *** turbo, but hopefully some fuel tuning and increased rpms should knock some lag off. I may as well pull the heads and manifold off and get those ported and everything.

It won't be lazy with the new housing. Tuning will be able to move around your boost threshold (not lag), but the difference there won't be huge. Increased RPMs will only allow you to run a bigger A/R, which you don't need to do if you get a smaller one to start with.

[97 30th RS]

I see, so basically I should run a relatively small exhaust ar, like the .70 you said and then a 96 ar on the compressor??

[Teufel Hunden]

Originally posted by 97 30th RS:
I see, so basically I should run a relatively small exhaust ar, like the .70 you said and then a 96 ar on the compressor??

Leave the compressor side as it is.. the exhaust side is the only one you need to mess with.

[nocutt]

In actuality TH, tunning can help reduce 'lag' (like playing with timing) but I definately agree with the consensus...the hotside HAS to come down, it will do you better overall...3800's aren't dyno queens. A broader curve is something you will not see with the aforementioned turbo...
happy hunting!

[malice10985]

So...

What exactly happens if you change A/R's on the cold side?

I have a T04 with a .81 turbine ratio, and a .60 compressor.

[97 30th RS]

uh, what's up guys?

The turbo has an ar of 1.32, not 96. Please feel free to make fun of my bad judgement.

[GN-T66]

Originally posted by 97 30th RS:
uh, what's up guys?

The turbo has an ar of 1.32, not 96. Please feel free to make fun of my bad judgement.

thats gigantic. you'll see full boost maybe at the top of fourth gear if you're lucky [img]tongue.gif[/img]