typexero

Hey guys. I have a Garrett GT2871r on my integra and am getting it tuned on friday. I was just wondering how much PSI the stock wastegate can handle? Thanks.

spoolin turbo s

is it a t3 with an internal wastegate? if so id say somewhere between 20-25 psi

typexero

It's a T25 with an internal wastegate. Is there a way to adjust the wastegate?

spoolin turbo s

yeah you could adjust the wastegate arm but i wouldn't do it until you saw what it did the way it came

what hotside is it .64 or .86 ?

typexero

spoolin turbo s

how are planning to control boost? boost controller or are you just running off whatever the internal wastegate is set at usually they are set at either 6 or 8 psi I THINK im not positive

TheShodan

iTrader: (14)

they are typically a 8-10psi wastegate, but there are upgrades to that spring. You can go up to about 20psi with it, but at that point, you've just about maximized the turbos potential anyway, those are good to about 330whp or so, especially if you used the .86A/R t25 internal setup.

A boost controller will be needed regardless if you plan to go above the 8-10psi mark, and it will start to open at about 9.2psi of boost.

typexero

Thanks for the info. Just to clarify: can the internal wastegate handle 300 whp worth of boost?

TheShodan

iTrader: (14)

Yes.

typexero

Thanks. I will post my HP/TQ numbers once I get my car tuned.

Tony the Tiger

Stock T25 wastegate won't hold 20 PSI across the entire RPM range though... It can certainly do over 300WHP, but you will be making that at around 10-12 PSI.

Generally, the internal wastegate sucks.. It makes the turbo spool later, feel laggier, and occasional spiking. I would upgrade if you have the option to.

Without going to the external wastegate route, I went with a Forge motorsport adjustable wastegate actuator. That allowed me to hold 20 PSI all the way. Eventually I blocked off the wastegate port and went with a boostgate method and got my 420 WHP pull at 21-22 PSI. Internal gate + highboost = crappy.

TheShodan

iTrader: (14)

I've always like the forge motorsport IWGs. On most applications where i used this turbo, and I knew the client was going over 15psi, I switched to that one instead of the standard unit that comes in the package. At least the flappers are finally opening at about 86 degrees when they used to be about 70 degrees. If he intends to go for higher boost on a more consistent basis, I would look into converting to the external (block off the flapper, and convert with a pipe.) Or go T3 external, but stay in the .63A/R (The .82a/r is terrible for the purpose of the turbo.)