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Old 12-05-2020, 07:12 PM   #1
monte8616
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Unhappy LOST 10mph AND ABOUT 6 TENTHS

So, I have gremlins in my car... the motor is fine on the dyno, the MSD and coil from the car are fine on the dyno... the trans is fine - the converter has been sent out and is fine... has anyone had any issues with a Racepak causing an issue like this?? It’s really the only change we made over the winter... car made a few good passes and then lost the time and speed... it’s quite a discouraging problem - if anyone has any ideas, please help!! Thanks!

Joey Cole - GT/DA - 454 BBC - Turbo 350
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Old 12-05-2020, 07:37 PM   #2
MR DERBY CITY
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

Check fuel system, , the 30 second jug test is a good start, replace the battery/batteries....Have you done any welding close to the car ? .....Some racers have reported that their car became MAGNETIZED and they lost plenty of ET and MPH ......3 ideas to PONDER ......
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Old 12-05-2020, 07:38 PM   #3
Jeff Stout
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

In my experience I lost .3 and 3 mph and chased it to find out fuel pump. I had gauge mounted on windshield and always showed the 6 psi range. But it did not have volume. No symptoms of miss or stutter just a full range of loss of ET.
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Old 12-05-2020, 08:09 PM   #4
ss3011
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

Check compression and leakdown , for engine health .
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Old 12-05-2020, 08:15 PM   #5
monte8616
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

Did the fuel system test - all good - the welding is an interesting thought... batteries are pretty new - Racepak shows all good with fuel pressure... but something to think about with the volume - thanks everyone! Keep the ideas coming!!
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Old 12-05-2020, 08:28 PM   #6
MR DERBY CITY
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

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Originally Posted by monte8616 View Post
Did the fuel system test - all good - the welding is an interesting thought... batteries are pretty new - Racepak shows all good with fuel pressure... but something to think about with the volume - thanks everyone! Keep the ideas coming!!
Just curious, how much did it pump in 30 seconds,.....carry on....
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Old 12-05-2020, 08:29 PM   #7
monte8616
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

Gallon in 18 seconds so volume is good

Last edited by monte8616; 12-05-2020 at 08:32 PM.
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Old 12-05-2020, 08:35 PM   #8
Jeff Stout
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

Not to bash, but it was a Barry Grant pump. It was aerating the fuel. So the gauge was actually air/ liquid pressure. No O2 sensor at the time. Also at the time I was not to smart and threw about 1500.00 and 7al, wires, new tach, plugs. Checked valve springs twice. Cam timing, compression test. Three different outings at track. It was a real learning experience.

Last edited by Jeff Stout; 12-05-2020 at 08:42 PM. Reason: More
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Old 12-05-2020, 08:36 PM   #9
Adger Smith
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

Put the 3 speed back in it...LOL
Do you run foam in the fuel cell?
Pull the cap off the fuel cell vent, check the vent for obstructions.
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Last edited by Adger Smith; 12-05-2020 at 08:38 PM. Reason: finish
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Old 12-05-2020, 08:41 PM   #10
monte8616
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Default Re: LOST 10mph AND ABOUT 6 TENTHS

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Put the 3 speed back in it...LOL
Do you run foam in the fuel cell?
Pull the cap off the fuel cell vent, check the vent for obstructions.
I do still have the foam in the cell - thanks for the reminder - someone else mentioned that...
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