gt2871r/gt2540r on ka24de, can internal wastegate handle it?

[ryan hagen]

so i have most of my motor built, ross 8.5:1 pistons cryo'd rods, arp bolts, arp main and head studs and cometic gasket, then polished exhaust ports ferra valves, bronze guides, supertech springs, and i still need to buy crower cams turbostg 2.

now with either 550 or 650 injectors and my jwt ecu reprogrammed i was thinking of running a gt2540r or a gt2871r

but with a bottom mount ssa t25 mainifold like i already hav. can the internal waste gates of these turbos handle the 350-375 hp worth of exhaust from the 2.4L in .82 or .86 A/R

i d like to go internal wastegate for keeping it simple but if i m gonning to cook the shit outta the turbo and every thing else by running too small of a exhaust housing i d rather do a t3 with a external waste gate. and rather not have to deal with boost creep and other wastegate realted problems

i had thought about a 1.5" spacer between mani and turbo to add a external waste gate but i dont know if i will clear the stearing rack and the other items down there.

this car will be autocrossed alot, c alot of driftdays, and the close by go cart track the most so i t will have alot of high rpms for extended periods of time.


i dont know how much of a differnece there is in the t3 and gt28 for exhaust housing size so i m just asking for help or advice from any one more experienced.


thanks