LS7 FAST 102 running out of steam?

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11-20-2010, 09:53 PM

#41

lubelizard

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Just a novice question, but are the pushrods a larger diameter than stock? Seems that a larger pushrod would be a good idea with that much open spring pressure.

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11-21-2010, 09:59 AM

#42

Marble_Sharp

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Quote:

Originally Posted by lubelizard

Just a novice question, but are the pushrods a larger diameter than stock? Seems that a larger pushrod would be a good idea with that much open spring pressure.

They are an upgraded hardened pushrod. Not sure as far as diameter.

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11-21-2010, 11:52 AM

#43

lubelizard

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Even though they're hardened, they might be flexing back and forth from the high spring pressure. That's why I mentioned larger diameter rods.

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11-24-2010, 05:37 PM

#44

71CamaroLS1

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Quote:

Originally Posted by Marble_Sharp

This is how it shows on the dyno -

Any chance they got a data log that included injector pulse width? That could decisively eliminate an ECU or tuning glitch as the cause of the dead rich condition ...

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11-25-2010, 01:50 AM

#45

ringram

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If its going rich then it sounds tune related.
Lean might mean maxed injectors or pump too small, but rich says your tune might be bad to me.

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12-02-2010, 10:54 PM

#46

LSWNDR

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is the camshaft falling of hard at 7,000 or is that the intake???

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12-03-2010, 04:38 PM

#47

Marble_Sharp

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Quote:

Originally Posted by LSWNDR

is the camshaft falling of hard at 7,000 or is that the intake???

We think it is valve float, so we are going to swap the springs. Hopefully we will get some new ones ordered next week.

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12-03-2010, 08:28 PM

#48

miami993c297

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Quote:

Originally Posted by Marble_Sharp

We think it is valve float, so we are going to swap the springs. Hopefully we will get some new ones ordered next week.

I agree on the valve-train instability...and hope you will not have to go Titanium to solve the weight issue

Christian

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03-12-2011, 07:38 AM

#49

Marble_Sharp

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Here is a quick update - it appears the Heads were set-up incorrectly causing coil bind! Put in a new set of springs, correctly, and problem appears to be solved. SHould be back up on dyno within the week, possibly even today!

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