Throttle Body
https://ls1tech.com/forums/cadillac-...sion-pics.html
If you read that post carefully you will see that the guy adapted a LS2 TB from the previous C5 DBW TB.
There is company the sells the adapter harnesses that allows the use of the newer TB's on older LS engines. Their harnesses use built in resisters and stuff.
I still think the TPiS route with a LS2 TB is the best way to go. The 90mm inlet and TB is worth 8-12hp on a stock LS6 engine. We would gain more then that due to our small intake piping. Plus we have supporting mods.
If you read that post carefully you will see that the guy adapted a LS2 TB from the previous C5 DBW TB.
There is company the sells the adapter harnesses that allows the use of the newer TB's on older LS engines. Their harnesses use built in resisters and stuff.
I still think the TPiS route with a LS2 TB is the best way to go. The 90mm inlet and TB is worth 8-12hp on a stock LS6 engine. We would gain more then that due to our small intake piping. Plus we have supporting mods.
Last edited by DavidGXP; Sep 21, 2011 at 11:44 PM.
well in think the 90mm tb is hard to clear and i dont want anyone messing with my modified intake. Plus i already have a ls6 tb.....i dont really want to spend more money on a tb and conversion plus we still cant get the wiring right.....
If your wanting to use a 90mm TB, I don’t think you need the Dr X harness? I had the truck 90mm TB hooked up to the GXP and my scanner showed that everything looked good. I should be putting my new intake on Sunday. I’ll let you know how it goes.
Were you able to command the throttle body to open and close? And the problem with 90mm throttle body and also re-sizing the intake to be larger is that since its all a custom job, it doesnt really fit like there is only so much space in that area.
https://ls1tech.com/forums/ls4-perfo...ke-option.html
I was thinking that the 90 would work with the Edelbrock or the new Holley intake.
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Verdad Gallardo This is TRP's response.
We do not have a LS4 TB kicking around to test.
If the truck TB is pinned correctly(same as you have written) both TP sensor signals should be moving in the same direction. Therefore, to preserve the uniqueness of each TPS signal, all of the 5V and 0V reference circuits are independent and not interchangeable on the trucks. That may or may not be the case on the LS4 if the TPS signals move in opposite directions.
If you are certain that your ECM is expecting the sensor signals to be moving in opposite directions, you can jus swap the 0V and 5V reference wires for the appropriate sensor, so that it moves in the desired direction. From your description it sounds like you have to do this for the circuit you are calling TPS1.
Your "closed" values seem a little high. Were you actually holding the blade fully closed or was this at the spring-determined position? If you take your readings at fully closed and wide open we can get a better idea if the ranges of the sensors in both TBs are similar/compatible.
Regards,
Grant at TRP.
Last edited by DavidGXP; Sep 25, 2011 at 06:23 PM.
Well crap, I can't find my TB. I put somewhere so nothing would happen to it, I'll be damned if I can remember where.
This is the one I used. https://ls1tech.com/forums/parts-cla...-iii-tbss.html
Oh and it looks like the Holley is just for the LS3.
This is the one I used. https://ls1tech.com/forums/parts-cla...-iii-tbss.html
Oh and it looks like the Holley is just for the LS3.
No.. I used a 03-07 TB that uses a TAC.
This is TRP's response.
We do not have a LS4 TB kicking around to test.
If the truck TB is pinned correctly(same as you have written) both TP sensor signals should be moving in the same direction. Therefore, to preserve the uniqueness of each TPS signal, all of the 5V and 0V reference circuits are independent and not interchangeable on the trucks. That may or may not be the case on the LS4 if the TPS signals move in opposite directions.
If you are certain that your ECM is expecting the sensor signals to be moving in opposite directions, you can jus swap the 0V and 5V reference wires for the appropriate sensor, so that it moves in the desired direction. From your description it sounds like you have to do this for the circuit you are calling TPS1.
Your "closed" values seem a little high. Were you actually holding the blade fully closed or was this at the spring-determined position? If you take your readings at fully closed and wide open we can get a better idea if the ranges of the sensors in both TBs are similar/compatible.
Regards,
Grant at TRP.
This is TRP's response.
We do not have a LS4 TB kicking around to test.
If the truck TB is pinned correctly(same as you have written) both TP sensor signals should be moving in the same direction. Therefore, to preserve the uniqueness of each TPS signal, all of the 5V and 0V reference circuits are independent and not interchangeable on the trucks. That may or may not be the case on the LS4 if the TPS signals move in opposite directions.
If you are certain that your ECM is expecting the sensor signals to be moving in opposite directions, you can jus swap the 0V and 5V reference wires for the appropriate sensor, so that it moves in the desired direction. From your description it sounds like you have to do this for the circuit you are calling TPS1.
Your "closed" values seem a little high. Were you actually holding the blade fully closed or was this at the spring-determined position? If you take your readings at fully closed and wide open we can get a better idea if the ranges of the sensors in both TBs are similar/compatible.
Regards,
Grant at TRP.
Based on Brian's log of the LS4 and 07+ truck TBs' TPS outputs, I would say that using the tested TB might be an easy swap with just omitting 1 pair of 0V/5V circuits. Looks like the TB he tested was the 87mm TBSS/07+ truck/LS9 TB(gold blade). The LS3 TB(gold blade) has similar TPS ranges. The LS2 car TB (aluminum blade) has slightly different TPS ranges.
Grant
Last edited by DrX; Sep 26, 2011 at 07:54 PM.
2008, 78mm, body, bolt, dimensions, grand, gxp, ls6, lsa, mechanical, performance, prix, specs, throttle, throttlebody
