What are some tricks to get rid of a part throttle low RPM bog?
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Joined: Oct 1999
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From: Houma, LA USA
What are some tricks to get rid of a part throttle low RPM bog?
My TBI keeps bogging at part throttle but usually won't at near WOT. Also my car accelerates harder at 3/4 throttle than full WOT. Could it be detonating at WOT and this be why it isn't quite as fast. Thanks for any replys.
Supreme Member
Joined: Jul 1999
Posts: 1,366
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From: Atlanta, GA, US of A
Car: 94 Z28
Engine: LT1 w/ headers, catback, CAI, tune
Transmission: 4L60E
Axle/Gears: 3.23s
Well, I had similar problems w/ my 86 IROC's 305 TPI and it turned out to be the TPS out of adjustment. Had a bog, ran out of breath at WOT (guess it was going lean?, beats me), and the disengagement of the TC under light throttle was also a little rough. Adjusted it and the problems went away, actually made a rather large difference for something so simple. I am assuming a TBI car also has a TPS, if not ignore me.
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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray
[This message has been edited by Ray87Z (edited September 19, 2000).]
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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray
[This message has been edited by Ray87Z (edited September 19, 2000).]
Thread Starter
Member
Joined: Oct 1999
Posts: 249
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From: Houma, LA USA
It does and I thought I put it in spec. It should be at .45 volts at idle and over 4volts at WOT right? I think I may adjust it up a little. Right now it gets almost 5volts at WOT and it a little under .45 volts at idle. I think. Does anyone know the exact specs and/or reccommend a setting I should try in my setup? Thanks Ray
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305TBI FireBird, Holley Intake and TBI, Headers, Torquer Heads, Gears. Best E.T. 15.08 at 92.5, 0-60 6.45.(Before Heads)Summit cam purchased 204-214, to be installed in 350 shortblock "soon" Shooting for 13's, oh yeah!
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305TBI FireBird, Holley Intake and TBI, Headers, Torquer Heads, Gears. Best E.T. 15.08 at 92.5, 0-60 6.45.(Before Heads)Summit cam purchased 204-214, to be installed in 350 shortblock "soon" Shooting for 13's, oh yeah!
Supreme Member
Joined: Jul 1999
Posts: 1,366
Likes: 0
From: Atlanta, GA, US of A
Car: 94 Z28
Engine: LT1 w/ headers, catback, CAI, tune
Transmission: 4L60E
Axle/Gears: 3.23s
For a TPI car it should be around .55 volts closed throttle and over 4 at WOT. Sounds like your base setting is a little low. Hopefully that is the prob. Again I'm assuming the TBI setting is the same on the TPS as it is for TPI.
There is a article in the Tech Article Section here that lists instructions on setting the TPS, (lists base specs as .54 + or - .075). I double checked it but it doesn't specify if its standard between TPI and TBI or not. Perhaps a TBI guru will pop up w/ the goods here...
------------------
Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray
[This message has been edited by Ray87Z (edited September 19, 2000).]
There is a article in the Tech Article Section here that lists instructions on setting the TPS, (lists base specs as .54 + or - .075). I double checked it but it doesn't specify if its standard between TPI and TBI or not. Perhaps a TBI guru will pop up w/ the goods here...
------------------
Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray
[This message has been edited by Ray87Z (edited September 19, 2000).]
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