Want to build costom turbo kit. Need advice from boosted guys!

[pimp my yaris]

Houston we have a problem! Well I wrapped the downpipe with header wrap today and placed some sheet metal in front of the ECM. Then I went for another test drive. Found some open road and nailed it in first gear. This thing was awsome. Pulled like a strong V6. But my problem is my eyes were glued to the boost guage and I let off the gas when it hit 10 psi. Holly shit I cant believe the stock wastegate actuator would let it get this high. I still dont even know how high it would go. Im sure my fuel system is no match for this. It happened fast but it felt like it lost power after about 8-9 psi. I think it went lean. So tomarrow I will be looking for a new acuator. At least nothing blew up.

[Nexus1155]

Just don't hit full boost until you get everything sorted out especially proper fuelling with tune. 10psi on a GT25 is different than 10psi on a GT28, you may be perfectly fine. Try to find a flow graph for that particular turbo and compare to other peoples setups.

[Focus_Sh1ft]

Coulda sworn those Ebay places that sell GT25's have their wastegates set at 14 psi. I'll double check.

Edit: Nope, nevermind. The place you bought from says 8 psi. I'd be pissed at them?

You and I have the same diameter exhaust, so that can't be the issue.

[Parmas]

Originally Posted by pimp my yaris

Houston we have a problem! Well I wrapped the downpipe with header wrap today and placed some sheet metal in front of the ECM. Then I went for another test drive. Found some open road and nailed it in first gear. This thing was awsome. Pulled like a strong V6. But my problem is my eyes were glued to the boost guage and I let off the gas when it hit 10 psi. Holly shit I cant believe the stock wastegate actuator would let it get this high. I still dont even know how high it would go. Im sure my fuel system is no match for this. It happened fast but it felt like it lost power after about 8-9 psi. I think it went lean. So tomarrow I will be looking for a new acuator. At least nothing blew up.

Well if you didn't installed a boost controller ... you just experienced the so called boost spike. This problem appears on first gear (or in the case of a C160 transmission also on second gear which is low) . This problem is cured by controlling spring pressure directly from wastegate or tru the boost controller.

Boost Spiking could be dangerously fatal to engine internals since your tune may not be rich enough for the amount of boost entering the engine.