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

[BillKlineVT]

people on this board are running the .86 ar gt2871r internally gated and have seen around 400 hp IIRC...on the SR though. My .64 ar 2871 works great on the KA for autox and quick response.

[ryan hagen]

cool, i just needed to know if anyone else had tried with problems, i know what i can i get now. i was affraid the little t25 wastegate might not like the air flow from a 2.4L at 7000rpm at about 350hp, every one lists at 2.2L max