GT2871r T3 vs T25 hotside

**turbo2000** · 02-27-2014 10:26 AM

Im currently in the process of going big turbo, I bought at GT2871r with a T25 .64ar flange. However I'm having a hell of a time finding a manifold. A friend is willing to give me a super deal on an ATP T3 Manifold. So I have been considering swapping the turbo to a T3 4 bolt and going to an external WG.

Ive not really found much info on how this effects the turbo (spool time, power ext) I know that spool will be slower, just a matter of how much. Anyone running a T3 flanged 2871r? Would love to hear some impressions vs its T25 counterpart.

Thanks
Ethan

**redline380** · 02-27-2014 11:32 AM

Im using a t25 .86 or whatever, and the spool is fairly slow, but suppose to be equal to the .63 t3. the .63 t3 is the most common though

**Seerlah** · 02-27-2014 03:17 PM

Use the ATP ebay T25 clones for cheap. Many run the ebay clones with no issue. If it's going to crack, it's going to crack. ATP brand or not.

**Avant Nate** · 03-01-2014 06:08 PM

If I were to do it over, I think a T25 with internal wastegate would be so much easier to plumb. In the future if you ever wanted to go EFR, T3 starts at the 7064.

**viceprp** · 03-01-2014 07:40 PM

Stay with the T25.

**zandrew** · 07-22-2014 09:35 AM

For the gt2871r the t25 is more then fine and .64 is best suited to it. Later if you want to upgrade their is other options like gt3071r or gt3076r. Hell you can wven do a gt3582r and use all garrett parts with a t25 flange.

I have run the eBay ATP clone with no issues... just lap the mating surfaces...

**GrapeBandit** · 07-22-2014 02:12 PM

I like external wastegates not plumbed back into the exhaust (open wastegate). sounds mean as fuk

**viceprp** · 07-23-2014 05:32 AM

^ that it does.

**zandrew** · 07-23-2014 06:53 AM

I have a 3067R that I am thinking about running open dump on. I have actually NEVER heard an open dump. Where I work I could not get by with it..... Then again I could drive it without getting into it.

**viceprp** · 07-23-2014 07:04 AM

Yeah, take her easy going there and leaving. Get on it when your off the property.

**GrapeBandit** · 07-23-2014 08:58 AM

Originally Posted by zandrew

I have a 3067R that I am thinking about running open dump on. I have actually NEVER heard an open dump. Where I work I could not get by with it..... Then again I could drive it without getting into it.

I used to run open dump on my last 2.0 gt35t b5. I had atp mani with the atp screamer pipe that comes out of the bottom. most plumb it back into the exhaust, i didnt. let me tell you, when it opens, its friggen awesome. sounds like englishtown raceway park lol

**zandrew** · 07-24-2014 05:36 PM

Originally Posted by viceprp

Yeah, take her easy going there and leaving. Get on it when your off the property.

I don't think it wold be possible. Where I work I pass Lambo's, Ferrari's, Porshe; I have seen a Veyron. I get some hairy eye balls and those super douches (not all) will rev it up a lot of times when i go by. Its hard as it is now, once I get it all together it would be an impossibility.