When I go WOT in my '87 IROC-Z TPI 350.... datalogging shows my TPS to read 4.04v, and my throttle percent to be a constant 88.4%.....

What does this mean and How do I fix it. To me it seems like i'd be losing alot of power if I am at WOT and my computer thinks I'm only at 88% throttle.

Yes I am new, and can tell I am running very rich from 122 at idle, to 113-125 cruising depending on rpm.

165 ECM, $32B, Stock 350 TPI Chip (thus far)



(Car info)
350 .030over w/ 9.35:1
Flat Top 4relief Hypereutectic
416 Casting Heads 64CC
-2.02/1.60 Valves
-Unported
Comp XE262 H-Flat Tappet
-218/224 @.05, .464/.470lift 114ēLSA
Home ported:
-Plenum
-Runner lips
-Gasket Matched Plenum/runners/intake
-Stock base (a little)
Airfoil/K&N/180ēT-stat/No A/C
Hedman 1 5/8" Headers
Catco 3" Cat/Flowmaster
MSD 6AL/Blaster Coil/Accel 8.8MM PW
Bosch Platinum Plugs gapped .045
24lb SVO Injectors


Thanks
-Paul

 

some logging software requires you to put in min/max voltage so it can correctly calculate % throttle.

You can easily check to see if you are going WOT by flooring the car with it off and have a buddy stand outside the car to see if the butterflys are fully open.

Also you should check your TPS, it may have moved on you. Idle voltage should be ~.54 volts

 

This isn't something to worry about. And please don't up the TPS volts at idle to make up for this. You can run into a situation where the ECM then thinks the TPS is out of range (too high)and starts substituting values (which cause other problems like dropping out of PE).

Ski has some other good recommendations too.

RBob.

 

It definatly opens the butterflies all the way. I did see an idle tps voltage. It's its kindof on the line between .54 and .55. Sometimes it's either. I didn't see a place for the max TPS voltage, but I could have skipped over it. I'm using the latest MOATES software.

I know I have to change the injector flow rate to the correct 24lb of the svos, but what is the difference between single fire FI and double fire FI?

Thanks for the info guys!

 

Yeah at least in the earlier versions of Craige's Software you had to insert the voltages. Its easy to find what they are:

Just sit in the car, with the key to the "on" position. Read the idle voltage, then floor the car, with it still off, and read the max throttle voltage. Those are the values to enter.

Good luck!

 

paul,

i beleive you put the same value in single fire and double fire, so if you are using 24lbs, you put 24 in both fields.

as seen in this post a couple of days ago.

https://www.thirdgen.org/techbb2/sho...hreadid=178593