can you adjust the throttle cable
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 48
Likes: 0
From: New Orleans La
can you adjust the throttle cable
i had a friend floor the gas pedal while i checked the throttle body butterflys at WOT and noticed that they are only opening 80%... the car is a '92 i have a BBK 58mm...i checked the floor mat first. not the problem. i dont really have a whole lot of slack in the line its seems the spring on the 58mm is just bigger and if i tighten the cable it will just pull the throttle open more and idle higher...so then would i have to just play with the TPS to make adjustment for the slightly opened butterflys?...or do i lengthen the cable and then tacweld it somewhere higher on the arm so that it pulls more..not that i would but it seems to be the only solution (not really!)
the real question is if there a bolt to adjust it. im sorry if this got a little confusing any input would be greatly apreciated
the real question is if there a bolt to adjust it. im sorry if this got a little confusing any input would be greatly apreciated
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
No - make sure it's routed correctly. Having the throttle off of the idle stop is going to create more problems than it solves as the ECM will think it's accelerating and do nothing to control idle. I think the aftermarket makes an adjustable cable that you may be able to adapt, but it's probably better to check with the Manufacturer and make sure they sold you the right throttle body. If they say it works, I'd make it clear that it doesn't and get your money back.
Safety Car
Joined: May 2003
Posts: 3,789
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From: [Quote=WOEII] Is dried brown doodie powders man! [/Quote]
Actually, I think you can. I was dead set thinking no until some more ingenious members posted ways of how to do so. I don't recall the adjustment, if you want to call it that, being for an L98 or LT1 car, but it shouldn't matter. If my PUI memory serves me correctly, I believe the pedal bracket was shimmed up with some washers to take the slack out of the cable. A search should yield some results as this was just addressed fairly recently, and will hopefully help you fix the problem. 
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
News to me - but that doesn't mean they don't exist. The key for the L98 is usually the bend pass the Booster and you need to zip tie it to the cruise cable. Even if the pedal is shimmed, wouldn't removing them defeat the purpose? You get a longer cable but less pedal travel - same problem. Hate to think you've got to ghetto your setup to make the aftermarket part work; onus should be on the manufacturer (and lot of these guys say the product fits a certain engine, but say nothing about the car it's going into). On the other hand, if you're building a rod, you don't have much choice, so there are adjustable setups out there.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
Likes: 8
From: Myrtle Beach SC
St. Jude Donor '05-'06
If yours is a ASR car ther is a button between the ASR and pedal that releases the cable.Same as the button on L98 TV cables .To set it push the pedal to the floor.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
The problem is with the 58 mm TB. The TB requires more cable travel than stock. The only way to fix it properly is to move the point of the cable attachment, closer to the "center of the circle" (throttle shaft). That way, a given tangential movement (amount of throttle cable pull) will rotate the throttle shaft through more degrees of rotation. It's an incompatible linkage problem that has to be cured.
RACE ON!!!
RACE ON!!!
Racer
Joined: Dec 2004
Posts: 427
Likes: 0
From: Albuquerque New Mexico
Originally Posted by CFI-EFI
The problem is with the 58 mm TB. The TB requires more cable travel than stock. The only way to fix it properly is to move the point of the cable attachment, closer to the "center of the circle" (throttle shaft). That way, a given tangential movement (amount of throttle cable pull) will rotate the throttle shaft through more degrees of rotation. It's an incompatible linkage problem that has to be cured.
RACE ON!!!
RACE ON!!!
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Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
I had to do that on my intake swap. What I did wa to drill two new holes in the linkage braket to bring it closer to the TB, I mock set-it up first to see were I was going making sure I was somewhere in the middle of the vac pull for cruise and making sure I had enough cable to adjust TV. Also make sure the braket will fit in it's new forward location. Measure about three times drill once.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by drochau
So do you make a new hole? or just weld it closer to the shaft?
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Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Seems like an adjustable cable would be better. Lokar caters to the rod guys. Might try them at www.locar.com
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by SunCr
Seems like an adjustable cable would be better. Lokar caters to the rod guys. Might try them at www.locar.com
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Melting Slicks
Joined: Nov 2002
Posts: 2,471
Likes: 2
From: 1993 Quasar Blue 'vert Scottsdale AZ
This is common with the BBK throttle-bodies. Floor it and have your buddie see where that do-hicky on the left side of the TB is hanging up. Then cut a little v-notch in that place so it can open farther. I'm sounding like a real doofuss, but it works.
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 48
Likes: 0
From: New Orleans La
thanks everyone for posting back i dont know what im gonna do...im either going to try and repositon the cable or see what happens when i play around with the throttle positioning sensor and see if i can make adjustments like that after screwing the screw/stopper plate further out or i might just throw the stock one back on!
Race Director
Joined: Jul 2001
Posts: 14,604
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From: Glendale, AZ
Originally Posted by streettrim
thanks everyone for posting back i dont know what im gonna do...im either going to try and repositon the cable or see what happens when i play around with the throttle positioning sensor and see if i can make adjustments like that after screwing the screw/stopper plate further out or i might just throw the stock one back on!
i would call BBK and see what they recommend - i find it strange that they wouldn't have thought of this when producing the deisgn for the TB - they make one SPECIFICALLY for the each generation/motor combo - yours should be the following model
1542 - Twin 58mm 1992-93 LT-1
Melting Slicks
Joined: Aug 2003
Posts: 3,395
Likes: 393
From: Lakeville MI
Here's a crude way to adjust the cable if you have excess slack or play. It may also cure your problem, but it does sound like you have a lever ratio issue.
Just pull the cable out of where it snaps into the square hole on the bracket near the throttle body. Put a large washer over the end of the cable so it can't seat back into the square hole and then slip it back through and re-attach to the trottle body.
Be carefull that the cable isn't too tight at wot or you may wind up snapping it.
This will take out some of the play and also raise the pedal inside the car making it easier to heal and toe, by reducing the step-over height between the brake and accelerator pedals.
Just pull the cable out of where it snaps into the square hole on the bracket near the throttle body. Put a large washer over the end of the cable so it can't seat back into the square hole and then slip it back through and re-attach to the trottle body.
Be carefull that the cable isn't too tight at wot or you may wind up snapping it.
This will take out some of the play and also raise the pedal inside the car making it easier to heal and toe, by reducing the step-over height between the brake and accelerator pedals.
