internal or external wastegate

[Fenvy]

before one shoudl say that internal wg is for low boost only and external / quality wg such as hks/tial will accomindate for high boost, is that really true? I mean I read many issue associated with the external wg spring rate wrong so the boost just keep on going or the wg surge or other issues....

basiclally, I have a new gt2871r .64 turbo that's been sitting there for almost a year and I would like to install it soon... it has internal wastegate, planning to run 15~18psi and want to get no more than 400rwhrp for it... not sure what to do about the wastegate part

[Nismo_Freak]

External wastegate has much better boost control and produces more power. It weighs more and it is more costly, but I think the benefits outweigh the cost.

[Fenvy]

yeah, I am having 2nd thought on my dc manifold and would probably go with a hks wastegate

that means I need a new manifold... can you recommend something for me?

also I read that the internal wastegate needs to be welded shut, correct?

[Nismo_Freak]

Yes, you weld shut the internal gate.

I would suggest a Tial W/G as parts are more readibly found.

Peak Boost, 1-Fab, Boost Logic, Full Race, etc.

[Fenvy]

hm... full face manifold will run for abour 900, a tial wastegate will run another 100 so that's 1000

for 1000 you can get new oil pump (200), cams (350?), lesser manifold like dc (300), arp head studs (150)

[240doubledrive]

Hey sorry to bring back the post. I have the gt2871r also. I have an internal wastegate and the car is tuned at 14psi on a mustang dyno. I put down 266whp. I have a built head and lots of other mods. You will never see 400rwhp at that low of boost. Gt2871rs actually start making power after 20psi.

[Fenvy]

what motor? with that turbo I find it hard to believe yuou're getting only 266whp

[Dori Dori]

Use a stock exhaust manifold and weld on a wastegate flange. This is what Enthalpy did to make the most out of the .64ar GT2871r.

[DrifterProdigy85]

$240 can get you a .63 T3 Exhaust housing so you can go top mount and external gate. Im doing this in a few months. I absolutly hate the internal gate of my 2871R .64. The actuator has a lag period to open the wastegate and it sucks for finding the boost you want. If you stick with the internal gate i would definitly recommend putting on a HKS Actuator from a T25 or something thats more responsive. Its gonna need a custom bracket though.

I made 270whp on 14psi with a below 10.0 AFR. I am now running 18psi with an AFR of around 11.5. I should be seeing the 320+whp area now.

[highmilehatch]

Use a stock exhaust manifold and weld on a wastegate flange. This is what Enthalpy did to make the most out of the .64ar GT2871r.

+1 for that idea. That is the most cost effective way to go for your hp goal.