U/SA help request

[jmantle]

If the engine seems good, I'd suspect convertor issues. You may have a seized up stator, won't affect your 60 ft but will affect it the rest of the way down the track.

Jim Mantle V/SA 6632

[GTX JOHN]

Look to see where on track you lost the time.
I have been having problems with MSD Coils
a lot in last couple of years. It reflects more on back 1/2
numbers and particularly MPH. I would borrow another coil
to try. Also Electrical stuff and connections slow the car down and
I would go thru all related wiring.

[Sean Marconette]

Mike,

My car has pulled that on me. I thought I lost a cam, everything checked out fine with the engine and leak down. I could not find anything mechanically wrong, and pulled all of the grounds and cleaned them. And magically the car was back to normal. What I found out was a bad ground was the problem. The data logger never showed a voltage issue or fuel pressure issue. But 3 passes in a row it kept slowing down more, and did not sound any different, after resorting to everything but mechanical it had to be an electrical issue.

Good luck

Sean

[Lou Jeffery]

My 302 2v Maverick slowed .4 when I installed the correct legal carb. instead of the 351W carb that we thought was correct. That said we did have a issue with failed camshaft lobes that did not have a audible miss just really laid down. Louis Jeffery

[Mark Yacavone]

Originally Posted by jmantle

If the engine seems good, I'd suspect convertor issues. You may have a seized up stator, won't affect your 60 ft but will affect it the rest of the way down the track.

Jim Mantle V/SA 6632

I don't believe it's a converter issue.I was standing right there.
It went 85 under on the first pass. BJ didn't quite get it fully on the two step and it kinda rolled out on that run..still went that fast.
Next run , it looked good leaving on the two step.Surprisingly it slowed down over 2 tenths.
The head wind was quite strong at times, early on.

1st round Saturday, I assume Mike discounted the second TT ,and dialed kinda off the 1st one.
After the red light ,it ran 4-5 tenths over the dial.
My comment was .."You ought to be able to find it now".

Mike..You remember I told you about my street bracket car?
I had replaced the stock HEI module and coil with a slightly used MSD 6 A and a used Blaster coil.
Last two outings, it's been about 5 tenths slower than in the beginning .
The car starts, runs and drives perfectly.
I'm going to change it all back as soon as I get a chance.

[Mike Graham]

I don't discount that it could be ignition. It has a Digital seven with the MSD coil.
I am very meticulous when it comes to ignition wiring. The MSD has 8 ga wire directly to battery for power and the same to the block for primary ground. The MSD has no low voltage alarms recorded. will re check all of that. We are going out Friday and will swap boxes and coil.
I thought Mark was right and I would find a bunch in the filter or in the trans pan. But more subtle than that.

[Mike Pearson]

If its been sitting a while I would check the valve springs too. Might even have a broken one or two. something like that could happen between two runs. Most likely not the MSD or coil. Anything else change electrically? The digital boxes don't like any "electrical noise". Did you run a leak down or compression test?

[Bob Gullett]

Years ago we had a fuel pump go bad. Had pressure but no volume. Or a plugged fuel filter. It caused us a major performance loss and didn't affect the running of the car. No engine miss or nothing. Changed pump problem cured.

[Paul Wong]

[QUOTE=Bob Gullett;463588]Years ago we had a fuel pump go bad. Had pressure but no volume. Or a plugged fuel filter. It caused us a major performance loss and didn't affect the running of the car. No engine miss or nothing.

I lost a class race a few years ago to Bob because of a fuel pump failure in a "U" car. fuel pump just failed to keep up because of lack of volume.

[Bob Gullett]

Originally Posted by Paul Wong

I lost a class race a few years ago to Bob because of a fuel pump failure in a "U" car. fuel pump just failed to keep up because of lack of volume.

That's the only way I can beat that U car! LOL