BBK 52mm Throttle body install
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
Congrats on the quality BBK tb. The answer is not hard. Dialing in the TPS voltage.
The L98 slotted & LT1 non adjustable. Slotting is possible to perfect a specific voltage. each, have 2 different TPS designs. A scan tool or data logging makes dialing in the voltage effortless. The next method piercing the harness or making extended pins to allow connecting a volt meter.
The L98 slotted & LT1 non adjustable. Slotting is possible to perfect a specific voltage. each, have 2 different TPS designs. A scan tool or data logging makes dialing in the voltage effortless. The next method piercing the harness or making extended pins to allow connecting a volt meter.
Last edited by THE 383 admiral; Mar 30, 2017 at 10:51 PM.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Congrats on the quality BBK tb. The answer is not hard. Dialing in the TPS voltage.
The L98 slotted & LT1 non adjustable. Slotting is possible to perfect a specific voltage. each, have 2 different TPS designs. A scan tool or data logging makes dialing in the voltage effortless. The next method piercing the harness or making extended pins to allow connecting a volt meter.
The L98 slotted & LT1 non adjustable. Slotting is possible to perfect a specific voltage. each, have 2 different TPS designs. A scan tool or data logging makes dialing in the voltage effortless. The next method piercing the harness or making extended pins to allow connecting a volt meter.
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
Last edited by THE 383 admiral; Mar 31, 2017 at 02:16 PM.
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
When I replaced mine, I found that it was slotted and the same BS with the parts guy. So I slotted the new one and set voltage both high and low, which tool a few tries, like with most things.
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
Retired is you.
the nitpick is strong with this one.
If I remember right I put it on and drove, and of course naturally it did not seem right psychologically. So I checked voltage and it was .36... mind you I am remembering back about 15 years. I checked high voltage and it was 4.5 or so. This will not do.
So I slotted it till it was .54, and whatever is ok on top, but that did not work out now. So a few more tries and I was in spec of L98 of old.
Also remembering back now 17 years, I thought I read that you could adjust to try and make up for throttle response. Which if you built an engine, you get really into this kind of nit picking. TPS, Initial timing, Idle resets, etc...
Plus the one I removed was slotted.
After all that, I learned it did not need to be adjusted.
but if I did not question it, how would I know anything?
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Much time, have you must
Retired is you.
the nitpick is strong with this one.
If I remember right I put it on and drove, and of course naturally it did not seem right psychologically. So I checked voltage and it was .36... mind you I am remembering back about 15 years. I checked high voltage and it was 4.5 or so. This will not do.
So I slotted it till it was .54, and whatever is ok on top, but that did not work out now. So a few more tries and I was in spec of L98 of old.
Also remembering back now 17 years, I thought I read that you could adjust to try and make up for throttle response. Which if you built an engine, you get really into this kind of nit picking. TPS, Initial timing, Idle resets, etc...
Plus the one I removed was slotted.
After all that, I learned it did not need to be adjusted.
but if I did not question it, how would I know anything?
Retired is you.
the nitpick is strong with this one.
If I remember right I put it on and drove, and of course naturally it did not seem right psychologically. So I checked voltage and it was .36... mind you I am remembering back about 15 years. I checked high voltage and it was 4.5 or so. This will not do.
So I slotted it till it was .54, and whatever is ok on top, but that did not work out now. So a few more tries and I was in spec of L98 of old.
Also remembering back now 17 years, I thought I read that you could adjust to try and make up for throttle response. Which if you built an engine, you get really into this kind of nit picking. TPS, Initial timing, Idle resets, etc...
Plus the one I removed was slotted.
After all that, I learned it did not need to be adjusted.
but if I did not question it, how would I know anything?
The reason I asked is that if there is no difference and the ECM just figures out "We started with 0.7V and that is base" it is different from it expecting 0.54V and after say 0.1V it considers it "off idle" which is why people try to trick the ECM into thinking that so it might go off idle faster. But if that doesn't matter, whatever you set it to might not matter and all it does is maybe lose some adjustment range.
Like you, I question everything and maybe pick something up here and there.
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2nd Gear
Joined: Mar 2017
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Congrats on the quality BBK tb. The answer is not hard. Dialing in the TPS voltage.
The L98 slotted & LT1 non adjustable. Slotting is possible to perfect a specific voltage. each, have 2 different TPS designs. A scan tool or data logging makes dialing in the voltage effortless. The next method piercing the harness or making extended pins to allow connecting a volt meter.
The L98 slotted & LT1 non adjustable. Slotting is possible to perfect a specific voltage. each, have 2 different TPS designs. A scan tool or data logging makes dialing in the voltage effortless. The next method piercing the harness or making extended pins to allow connecting a volt meter.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
I guess if the throttle is open too far, which means IAC reset and TPS dialed in again once you close the blades. Otherwise you have a big vacuum leak.