OE Throttlebody swap across cars PROBLEM Found

[Guest]

While reviewing the latest datalog for my 3900 swap, I selected TPS %/volts for viewing to see what I was doing at the pedal. I noticed that both the voltage and percentage never went higher than slightly above a half throttle reading in code59.

Since I'm not in the vacinity of the car I reviewed a datalog from when the engine was being run with 8F TGP code and found the same thing indicating there is a considerable difference between the Northstar throttle arm radius compared to the Fiero throttle arm radius.

At this point although there is no slack in the accelerator cable, the difference has apparently resulted in neither of my engines experiencing full throttle with the pedal to the floor. If I'm correct there's a lot more in the engine than what I've found to date.

If you're using a larger OE throttle body from a larger than stock option engine be sure to check your throttle travel against your pedal travel.

[Superdave]

Strange, i used the N* TB with a Corsica cable in my jbody and had no problems. Time to swap out your gas pedal.. lol

[Mars]

I always get a buddy to go in the car and smash the pedal to see if you get full movement. I just did this recently with my Aurora 65mm unit and custom braket in teh camaro. Always good to double check.

[Joseph Upson]

I doubt most people bother to do that when the cable connects up nicely and there's no slack. I sure didn't, but I now recall doing a little bending on the bracket for clearancing the crossover pipe that might have contributed to the problem. Whatever the case, I hope that I'm correct about the linkage being the problem because that would mean there's quite a bit more power available than what I've tested so far. I might not need boost to get it into the 12 sec quarter range with what the new motor has demonstrated so far.