SFI 25.2 Mustang/LSx build "The Renegade"

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07-29-2012, 02:36 PM

#4741

Wnts2Go10O

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maybe youre making that much more power

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07-29-2012, 03:17 PM

#4742

Phil99vette

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Quote:

Originally Posted by Wnts2Go10O

maybe youre making that much more power

I doubt it. We did a couple transbrake tests at 3700rpms and made 5.8 and 9psi. Went to the track and had trouble staging, brakes wouldn't hold(think they need to be bleed again) so we didn't leave with not near as much as before.

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07-29-2012, 04:10 PM

#4743

onfire

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My bet is it was defective. Which brand?

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07-29-2012, 06:49 PM

#4744

outlawdart

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Yes I agree. I shouldn't of broke so fast. The ones I have seen will twist bout 1-1 1/2 splines then stay there for a good time before they give up or twist anymore. To check how many splines a shaft is twisted, just lay a straight edge on untwisted splines and count splines to the one that you are aligned on. For the ones wondering what I'm talking about.

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07-30-2012, 09:55 PM

#4745

fknsmshn

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Is that a bend before the splines, or just an illusion?

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08-02-2012, 09:45 PM

#4746

LS1SSII

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Have you talked to the mfg of the shaft yet? I wonder if it was never heat treated? I would assume they would want it back for testing. Good luck with it.

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08-03-2012, 10:40 AM

#4747

Phil99vette

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The tranny should be back today. The mfg fixed it under warranty and they want me to do some measurements on the block to ensure there was no errors in the machine work process. Mainly they want to ensure the bellhousing is aligned correctly with the crank. They state they have never seen a shaft fail like mine and the last shaft failure was over 4 years ago.

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08-03-2012, 01:35 PM

#4748

Wnts2Go10O

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Quote:

Originally Posted by JL ws-6

That would cause it.. that shaft is meant to take alot of twist load, you try to flex it (bend) it's not going to be happy at all.

What a pita that would be if it is the block... hopefully not for your sanity's sake.

i think a lot of people here would collectively break down after watching this build.

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08-03-2012, 02:58 PM

#4749

Phil99vette

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I'm going to measure it here shortly. I dont think its the issue.

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08-03-2012, 04:24 PM

#4750

Phil99vette

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.002 out of roundness
.0015 out of flatness

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08-03-2012, 05:47 PM

#4751

Phil99vette

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The only thing that was questionable was the crank hub adapter, it had just alittle too much play. Got a new one machined/converter matched and its a precision fit now.

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08-03-2012, 07:54 PM

#4752

defbob

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did you have a Coan hub adapter?

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08-06-2012, 08:45 AM

#4753

Jon@BruteSpeed

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Phil, if there was an award for resiliency...you win. Was this shaft in there on your previous set up? Just wonder whats different.

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08-10-2012, 07:38 AM

#4754

fergymoto

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I've seen some shafts twist a little bit and then be fine for years, never breaking. That's racing... stuff breaks. Even brand new stuff. You better be resilient or you won't last long LOL