GTA throttle bodies

I'm in the process of tuning my 147 GTA engine, I have already decided on getting the AH 3.8 conversion however I'm undecided on a throttle body kit aswell? I see that the AH kit uses Jenvey bodies which I have heard good things about but I would like to know If anyone has had this conversion done to their V6 before and what sort of performance gains would I expect? Cheers

cant speak for performance gains for the GTA engine. have used TBs on a few vauxhall engines and if set up correctly with a well worked head and hot cams and free flowing exhaust the gains can be fantastic. down side is TBs are VERY loud. too loud for a daily drive!

performance - we have a corsa running a 1.6 NA engine on Jenvy TBs (direct port), head polished and flowed, hot cams, forged pistons, custom exhaust and aftermarket ecu and at the last rolling road session it pulled 201bhp. will rev to over 9000rpm but its just far far too loud for anything but shows really.

Whatever you buy, it will need to fit under the bonnet.

Have you priced up the 3.8?? Last figure I heard banded about for it was well into five figures....its a hell of a lot of money.

Out of interest I asked Adie how much it would cost to turn a 3.0 into a 3.8 and it was "over ten grand"..

Obviously different TB's than Jenvy but adding Ferrari throttle bodies to an AD 3.7L conversion definitely doesn't make it particularly "loud ", just a nicer sounding roar. Dont know how different the Jenvys would be?

are the ferrari TBs direct port? i always thought you replaced the stock TB with a larger one whilst retaining the inlet manifold. the jenvys replace all this and you essentially have a throttle body on each inlet port of the engine with a seperate air filter per TB. you can also set up so the throttles conenct to very short runners that are in turn connected to one big filter

cant find a great picture but here is a jenvey kit fitted to an alfa V6 (3.5)

http://www.jenvey.co.uk/Imgs/Gallery/AaV6.jpg

note the 6 trumpets showing, this is where you will typically mount filter(s). this is why this setup is extremely loud, there is no intake system as such to quieten it, your literally direct to the engine.

Originally Posted by marko

are the ferrari TBs direct port? i always thought you replaced the stock TB with a larger one whilst retaining the inlet manifold. the jenvys replace all this and you essentially have a throttle body on each inlet port of the engine with a seperate air filter per TB. you can also set up so the throttles conenct to very short runners that are in turn connected to one big filter

cant find a great picture but here is a jenvey kit fitted to an alfa V6 (3.5)

http://www.jenvey.co.uk/Imgs/Gallery/AaV6.jpg

note the 6 trumpets showing, this is where you will typically mount filter(s). this is why this setup is extremely loud, there is no intake system as such to quieten it, your literally direct to the engine.

lovely 12v motor, lovely trumpets, very niiice tappet cover...AHM kit is nice...

p.s. is that from an SZ?

I didn't realize you were talking about ITBs rather than just TB replacement.

I'm sure what you posted would be loud :-)

You would also need to fit a basic cable throttle.
I don't think anyone has fitted multiple throttlebodies and kept the fly-by-wire throttle.

not sure what thats in, just what i found on the jenvey site.

trail - loud. yes. heres a video clip showing the revs increasing on the corsa... only the first 10 seconds or so are relevant as its much of the same. notice how fast and how far the thing revs tho, really fun to drive just tooo loud!

Remix for corsa808 - Photobucket - Video and Image Hosting


david - correct! i dont know of anyone who has kept fly by wire on multiple TBs. im sure its possible but would be very expensive and a ***** to set up!

Marko - thats a mental Corsa!

I'll be removing the engine myself, Buying the kit for about £2300, block and head mods, 1K, rebuild engine using the kit, £500, new clutch, £400, ECU remap aprox £600 so with timing belt and and bits I's say £5k I will also be getting new ex manifold(£1200) Not that bad for £350 bhp imo

.....also a q2 diff....(£230)