throttle body
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On The Tree
Joined: Mar 2008
Posts: 185
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From: Missouri
throttle body what size is our ls4 throttle body? i was lookin at the vararam velocity stack and the vararam throttle body spacer. just wanted to make sure they would fit.
http://www.vararam.com/vr3.html
http://www.vararam.com/tbs1.html
http://www.vararam.com/vr3.html
http://www.vararam.com/tbs1.html
I think out TB's have a 3 bolt holes, not 4. I think someone on here used an Air Raid TB spacer and it fit but I believe it had 3 bolt holes. May want to try a search. Not sure about that velocity stack thing. It kind of looks flimsy.
-Mike
-Mike
The TBS won't fit. Its too big. The TBS you need is AiRaid 200-586. Its for chevy trailblazer/gmc envoy with the 4.2L inline 6. Our throttle bodys are the exact same as those. I doubt the vararam velocity stack will fit either. It'll be too big also. Our TB is like 76-78mm dia. The other LS engines are about 85mm dia factory. Hope this helps.
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I am not sure of the weather in your part, but the weather here is great. 
On the TBS, they are ok, but honestly, I would not spend the money on them unless you were running a car that was Supercharged, then its worth it.
On the TBS, they are ok, but honestly, I would not spend the money on them unless you were running a car that was Supercharged, then its worth it.
LOL I didn't even notice I screwed up the 'weather'!
Does anyone do ported throttle bodies for our cars? And do they have the gains that ppl see on the LS1 cars? I know on my TA, I could feel a noticeable difference when I went from stock to a ported TB..
Does anyone do ported throttle bodies for our cars? And do they have the gains that ppl see on the LS1 cars? I know on my TA, I could feel a noticeable difference when I went from stock to a ported TB..
I have no concrete dyno evidence on the TBS. But I think it seems to help passing power slightly. Also if paired with a CAI it gives you a whistling/swooshing sound. Kinda like a supercharger. A guy from scoggin dickey gmpp told me you might see a .5 -2 hp gain on our engines. Not really cost effective i guess but I like the results. Your best bet is to go with 1.8 ratio roller rockers and an HP Tuner tune. It'll make a night and day difference. Trust me. 
