Wasnt sure if this was the correct spot for this post but if it isnt, mods you can move it. Anyways...

When i first dynoed my car when i dyno tuned my stage 2 i was getting really good numbers. Then went i dynoed for meth and then again after that at car shows i hit low numbers. 20-30whp lower. Thought it was a coolant leak cuz i had a small leak cuz one of the hoses of the aftermarket h/e was coming loose but i fixed it and same issue. The last few times i dyno'ed i notice my ABS light was on. Could that cause the dyno readings to be false. ie...would it cause the wheels not to spin 100% since its trying to do its job?

 

its slightly possible, but it's more likely that its unrelated and you have a connector loose somewhere, probably the wheel speed sensor.

 

Completely normal. ABS control module notices that the front wheels are spinning really fast while the back wheels are not moving at all. It sets a code but shouldn't affect your results. Typically though, you want to disable traction control if you have it to ensure that there is no problem.

 

ok cool, i think i found the issue, small coolant leak and a big leak in my meth kit, fixed both and car feels better.

 

Pull the ebrake when setting the car up on the dyno. That should shut off the ABS light if I remember correctly.