I got my car all together, with open headers and no belt on the car had awesome throttle responce and low TPS voltage(no tune)

I got the car all together 100%, tuned and such had to slot the TPS to get enough voltage to satasify the PCM (highest i could get is .241 and yes thats pretty much max) now would a TPS voltage of say .500 or more net quicker Throttle responce? or is there somethign else i can look at? The TB is a 58 mm holley, which is new to the car.

THe problem is it idles around 850ish and if i hit it a little off idle it kinda stumbles then revs up. but if its at like 1100-1300 itll rev right away.. the cam isnt a big cam. 228/234 .550s lift on both sides on 112 lsa. 1.6 rrs PP Stock heads and 2.00 intake and 1.56 exhaust valves... is there somethingi can look at? i cant get it scanned yet, untill i get insurance back on it to take it to school and scan it.

If theres something i can look at id appreciate it. thanks a ton!


-Mike

 

I have the 58mm Holley, and was able to get 0.60V with screw slots in the TPS sensor. You might want to check the system by verifying that you have 5.0V on the gray wire from the PCM, and a good ground on the black wire. Also verify that the slot in the sensor is properly indexed to the shaft on the TB. Finally, check the sensor for resistance across the range from the "return" spring position to fully open. Somewhere I must have the notes on the values I got while trying to figure out a problem on mine (turned out the guy that did the wiring harness for the MoTeC had the gray and blue wires reversed in the connector).

In theory, the LT1 ECM/PCM sets whatever it sees for the closed throttle voltage as 0% and prorates up to 100% TPP at a value maybe 3.5-4.0V higher than the closed throttle value, so it shouldn't make any differencs, as long as it is in the range that doesn't set a code.