" t.p.s setting amount " ?
Thread Starter
Racer
Joined: Aug 2005
Posts: 469
Likes: 1
" t.p.s setting amount " ?
hi guys,
i know that to set the throttle position sensor to .54 volts but i heard also you can set it up too .65 volts!
is there any different setting on the tps from 85- up to 96 models as far as the tps setting please?
would it be any better performance gain setting the throttle to .65 volts rather than the standard setting of .54 volts?
or would it make things worse please?
any ideas/tips/help on this matter would be great!
cheers
glen
Australia
i know that to set the throttle position sensor to .54 volts but i heard also you can set it up too .65 volts!
is there any different setting on the tps from 85- up to 96 models as far as the tps setting please?
would it be any better performance gain setting the throttle to .65 volts rather than the standard setting of .54 volts?
or would it make things worse please?
any ideas/tips/help on this matter would be great!
cheers
glen
Australia
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
The higher voltage you set your TPS, usually the higher the idle. I found from running scans that my desired idle in the chip was lower than the actual idle and the IAC was trying to compensate. My TPS was set around .59v and by lowering it to the stock .54v, my idle is right on. The 90-96 have non-adjustable TPS's from what I remember.
Last edited by RRT vette; Apr 5, 2007 at 11:22 PM.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
"The 90-96 have non-adjustable TPS's from what I remember"
If you have a stock '91 TPS it is not adjustable. To check this remove one screw and see if the TPS has a hole or a slot; only ones with the slot are adjustable.
Further I believe that your ECM will read the min TPS value at idle and set the min voltage as well as read the max value at WOT to set the WOT voltage.
The reason for setting the higher value on '85-'89 L98s is explained on my site.
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
Yes, you can modify the initial setting with the slotted one you bought... say to .070....but when you start the car your tps % value will be 0% (as it should be). When you turn the key it read your actual value (.054 or .055 or.0.60.0.70.. or .80..) and it know that this value it's the 0%TPS value.
On 85-89 the tps is volts referenced to a fixed value. Example if you adjust it to 0.67 the ECM know you are something more than .054 so your TPS can be more than 0% .
The only way to simulate the 85-89 (it's stupid to for me..) is to start the car and open the hood and adjust the TPS. (example from .050 to .65).
Once you stop the car and then you RE-start it, the value will continue to stay the modified one (.65 on our example) but the tps value will reset to 0%.
-Beppe-
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Its pointless. The changes made by adjusting the TPS should be made in the ECM tune (although adjusting the TPS will be totally ineffective on your 91 anyway). As most of the others here have said, the ECM will see the signal from the TPS and use the lowest voltage it sees as the voltage for "Closed Throttle". If it sees a new lower voltage reading, this new lower reading becomes the new Closed Throttle value.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
