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Weak point in Stock twins
What is the weak point in the stock twins...I am going to pull of the stockers and have them clipped and maybe rebuilt or slightly upgraded while im at it, and I was just wanting to know what the weak point of them is. Is it just that they are too small to flow enough for more than 500hp or just that they produce too much heat at 20psi or more or are the shafts too weak? I basically want to push about 500hp and not have to worry about the turbos going out.
Originally Posted by Stifun
I have the same questions so someone help pls.
I can't claim to be an expert but from everything I've read and my personal experience, I'm convinced the weak point is #2 failing from "shaft twist" as a result of sequential operation.
I've read many times how small the stockers shaft is. I have a '93 TT auto bought used in May '01 with 8,158 miles :-)
In July '01, I went BPU at 9.6 k. In Nov, I lost #2 due to shaft twist running another Supra. The temp was in the low 30s. I had the boost set for abouyt 1.4 kg/cm2 (~20 psi). It happened on the 4th 40-120+ run.
That was the highest I'd run the boost since going BPU but I'm pretty convinced it would not have happened if I was running TTC. I know some other Supras that have gone 30-60k+ miles running pulled hoses and getting spikes to 1.6 kg/cm2 without blowing a turbo.
BTW, never looked back. Went single with SP57, SP Fuel, VPC, SAFC. Running a PI 3-disc with a built tranny about to turn 14k miles.
Mike aka very happy camper