I am doing an S13 w/ S14 motor/trans build. I have the greddy S14 upper plentum and wanted to know if there is a benefit w/ running an aftermarket throttle body or just to get an oversized Nissan/Infinity OE. Are there any restrictions w/ one vs another? Wiring issues? Bolt pattern differences?
I have already had the head done by Headgames, full Ferrea valve train, HKS cams, VTC intake OE cam gear, HKS adj exhaust cam gear, etc. I want to do this build right the first time....I have seen anywhere from 70mm-100mm in both the OE throttle bodies and aftermarket.
Does anyone have experience w/ one or the other? I always see aftermarket versions on big horse power SR builds.
There is a company in Austrailua I've seen on Ebay that allows for the OE TPS to be used. Seems like a pretty nicely built throttle body. (pics are the only reference)
Any advise would be a great help.
Throttle body choices... Aftermarket or factory nissan?
I'm assuming this is for the SR20DET?
Larger throttle bodies like the Q45 for example can be used, but you'll need an adapter plate or to weld it on. You will see a decrease in the intake air velocity with a larger throttle, however if you're running higher boost, it will make up for that. If you're running a relatively small turbo, forget it. Money better spent elsewhere.
Larger throttle bodies like the Q45 for example can be used, but you'll need an adapter plate or to weld it on. You will see a decrease in the intake air velocity with a larger throttle, however if you're running higher boost, it will make up for that. If you're running a relatively small turbo, forget it. Money better spent elsewhere.
Re: (180fan)
I was planning on running the GT35r in a .63a/r until all the innovations w/ the twin scroll turbo designs came to light.
Geoff at Full-Race has really been doing a lot of R&D on the twin scroll mated w/ the S14 SR. I just read something about the superior design in the SR20VE head mated to the Sr20det S14/S15 block. I haven't made any turbo or fuel set up purchases yet b/c of so many changes in turbo's.
As for lower intake velocity w/ running a larger throttle body... If I am planning on running 18-22psi w/ all the head work I am having done then is it a better choice to run a mid sized 80-90mm instead of a 100mm throttle body? Most intercooler piping is 3" diameter anyway. I do realize that a plate adapter will have to welded on to my plenum and that is why I wanted to see what others are running before making a purchase and modifications.
Geoff at Full-Race has really been doing a lot of R&D on the twin scroll mated w/ the S14 SR. I just read something about the superior design in the SR20VE head mated to the Sr20det S14/S15 block. I haven't made any turbo or fuel set up purchases yet b/c of so many changes in turbo's.
As for lower intake velocity w/ running a larger throttle body... If I am planning on running 18-22psi w/ all the head work I am having done then is it a better choice to run a mid sized 80-90mm instead of a 100mm throttle body? Most intercooler piping is 3" diameter anyway. I do realize that a plate adapter will have to welded on to my plenum and that is why I wanted to see what others are running before making a purchase and modifications.
Hmm a 35r is a pretty big turbo. I think what you need to do if you're considering a larger turbo such as that, is 1. get the flow rate of your head. 2. find a turbo that will match that flow rate and balance with your power goals. 3. then look at the flow rates of the turbo at the pressure you will need and see if a 60mm throttle body will be a sufficient restriction that you'll need to go to a 65mm or 70mm. I wouldn't really suggest something as large as a Q45 (90mm) unless you're talking about some gt40+ turbo. You may want to consider using a GTi-R throttle, Tomei uses those on their Derive series engines.
Re: (180fan)
Thanks for the knowledge... That is what I am looking for!I am relying on Dave @ Headgames to help determine what turbo is going to best suited for the flow charteristics of the head when he is finished w/ it. I was considering a 30r but from what I've gathered a 30r will fade out around 400rwhp. Hence the 35r thoughts. I already have the factory S14 sr20 throttle body and enjoy building this S13 piece by piece. Remember I have not purchased any fuel or turbo compontents yet. I have someextra $$$ and thought a throttle body would be an easy purchase. Of courseit is not as easy as I first thought. I agree that a 90-100mm TB could be too big.
Not to change the tread topic but... does the info I've gathered sound accurate?18-22psi, built/ported head, cams, greddy plenum, built bottom end, w/ a 35r would put me into 400-500rwhp on high octane?
Not to change the tread topic but... does the info I've gathered sound accurate?18-22psi, built/ported head, cams, greddy plenum, built bottom end, w/ a 35r would put me into 400-500rwhp on high octane?