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

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 ......

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.

Re: LOST 10mph AND ABOUT 6 TENTHS
 

Check compression and leakdown , for engine health .

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!!

Re: LOST 10mph AND ABOUT 6 TENTHS
 

Just curious, how much did it pump in 30 seconds,.....carry on....

Re: LOST 10mph AND ABOUT 6 TENTHS
 

Gallon in 18 seconds so volume is good

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.

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.

Re: LOST 10mph AND ABOUT 6 TENTHS
 

I do still have the foam in the cell - thanks for the reminder - someone else mentioned that...