LS1 throttle body on a 3.8 VP series 2 donk

[Gemadore]

Has anyone put an LS1 throttle body on a 3.8 series 2 VP motor? Do they just bolt up and what sort of improvement should I expect. (The old girl is going to get a crow stage 3 cam and extractors to help with the breathing) The motor is a low km stock VP series 2 bolted to a T5 in a TG gemini.

Thx

[cander24]

It won't bolt straight up. You'll need to make some form of sandwich adaptor plate. The LS1 cable operated throttle bodies mount with three bolts, not 2 like your vp. The inside bore of the adaptor you'll also need to taper from 74mm down to 63mm (or whatever the vp throttle body bore size is).
Cheers

[304runner]

Don't waste your money and time on this.. The restriction will be in the inlet manifold itself.

Forget it.

[vyseriesII]

Agreed, the inlet manifold wont allow for the flow that the throttle body will be capable of. Mass overkill

[Munz]

Is this gonna be registered or a burnout pig?

Also Hakhawk done this a few years back - it seems the Australian Series II VN-VR L27 engine came with the one piece LN3 (series 1 VN) manifold. But I dunno if the l27 2 piece flowed any better

that one wont fit, its to suit the ecotec version, not the vn-vr version.

there is a manifold you can get, i have one. its the l27 manifold. im still working on getting it done. needs flipping around, modify the nexk to bolt on a vn throttlebody(or in my case, a ls1 tb ), modify the belt setup to clear the throttlebody, then sort out all the hoses and sensors.

whats your aim in using a different manifold? standing out from the crowd? more performance?

[Gemadore]

Thx for the feedback guys. I race the car at lakeside raceway in the Top Gear series and was looking for a bit more grunt.

Unfortunately, it seems an aftermarket manifold is required to accept the larger bore and sounds like more trouble than its worth. (just seen a heap of 'modified' throttle bodies on ebay and wondered how easy the change was.' I might look at another way of getting the air cu increased.