LS2 LS7 Throttle Body on a GMT900 5.3
05-31-2010, 05:01 PM
#1
TECH Enthusiast
Thread Starter
LS2 LS7 Throttle Body on a GMT900 5.3
Has anyone installed a LS2/LS7 part # 12570790 GM throttle body on a 5.3. I am specificly talking about the LY5 5.3 that has the 4 bolt 87 mm throttle body stock. There are many other threads but most are about the old 3 bolt style.
My question is did you see any gains, loss. Any problems?
My question is did you see any gains, loss. Any problems?
05-31-2010, 07:38 PM
#3
TECH Resident
iTrader: (7)
Join Date: Jul 2008
Location: Gonzales, LA
Posts: 783
Likes: 0
Received 0 Likes
on
0 Posts
Im pretty sure thats the part number i have, ls7 tb, which appears to be slightly different than niffs ls2 tb... got it on the roush tvs so idk about on a na motor, but so far so good, i like it...
05-31-2010, 11:01 PM
#5
yep.
3mm is better than not having those 3mm PLUS when you p&p the TB so it's more flow. the thing is your intake is already 90mm why not go with a 90mm TB?
ill make sure to do a 87mm and a 90mm run at the track and see what happens. unless when i dyno the truck Wed night ill try and see if they will let me dyno the 87mm vs the 90mm to see if it has any "difference"
3mm is better than not having those 3mm PLUS when you p&p the TB so it's more flow. the thing is your intake is already 90mm why not go with a 90mm TB?
ill make sure to do a 87mm and a 90mm run at the track and see what happens. unless when i dyno the truck Wed night ill try and see if they will let me dyno the 87mm vs the 90mm to see if it has any "difference"
05-31-2010, 11:49 PM
#6
^That will be a good test to see what comes out of it. I know someone dynoed a TBSS back to back with a 90mm and it lost 6-10 hp across the board; consensus was the different opening angle of the bigger tb didn't work well with the truck intake.
Trending Topics
06-01-2010, 08:00 AM
#8
^Wouldn't expect it to, on your bigger motor and big cam; i'm sure the 102 would even show good power on yours. But on a 5.3, either with cam, worked heads or even stock I'd like to see some back to back tests that show the 90 gaining something before I drop the coin on it.
I agree with you that if the plenum is 90, then a 90mm tb shouldn't hurt, and there's no reason it shouldn't make more power, if nothing else than at peak rpm.
I agree with you that if the plenum is 90, then a 90mm tb shouldn't hurt, and there's no reason it shouldn't make more power, if nothing else than at peak rpm.
06-01-2010, 08:08 AM
#9
well i figure on a stock motor you wont see a gain worth the money, but upgraded stuff and bigger motor itll be worth it. i dont have a stock motor to test the theory for you but i can test it on the 6.2 or you even if its done the cheaper way (track times)
06-01-2010, 08:19 AM
#10
About what I figure also. Do the 6.2 truck motors come standard with 87mm tb?