I'm not a fan of mechanical diode had one go bad you could see on racepak, when it went bad, 60' was all over the place. Sent the converter back they said it's OK. Ask them to change the stall by 300 hundred looser Long story short I didn't put that converter back in for a few years then went to a bracket final in Boise and thought I'll give it a try should work great for higher altitude. It did on the 1st pass then broke on the second pass would want to push me while staging but it was done lost 7-9 mph and ET went to crap. Sent it back again this time they changed the diode and I sold that convertor and will never use them again. I will only run spragless nothing to go wrong but the normal laying over fins.
You don't have racepak or any data recorder on your car?