so i have a USDM engine, i was gonna buy a USDM LIM, UIM and throttle body. the guy sold it..but he sdaid he had a JDM s5 TII LIM,UIM and throttle body. will this be fine on my USDM engine. i heard the only real diference is that the vacum nipples are in different spots. i just wana make sure before i buy it....
oh and i searched and found nothing that answers my question...just throwin that out there before someone goes on a damn rant

 

https://www.rx7club.com/showthread.p...hlight=nipples

 

I think the jdm ones don't have an egr valve or something like that. So if you have to pass emissions than you better double check! I have a USDM S4 turbo car with S5 turbo engine, but I blocked off all idle equipment and emissions equipment. Also the brake booster hose is in a different location, easy fix though.

 

correct me if im wrong but i thought that s5s dont have egrs?? jut air pumps...thats what i thought at least..just wondering

 

yes s5 dont have EGR.

 

okay, seems like i've heard that before. I'm pretty sure my USDM S4 T2 had an egr and the JDM S5 T2 engine I put in did not. But I haven't even worked on a S5 T2 yet.

Thanks for the clarification.

 

the bracket for the cruise control and throttle cables is different and will require modification. also, the air bypass screw on the BAC valve will not work.

 

if you don't need emissions then jdm manifolds and intercooler is the way to go.

 

what kind of modification? mild or am i gonna have to be welding something on the manifold? i have a welder but would prefer to not have to weld due to my lack of expierence. could someone explain whats different please?

 

the screw on the BAC is only for adjusting how much air BAC allows to flow past rgith? at least thats what i understand from the emissions FAQ.

"your bypass air adjusting screw which is on USDM (and I guess Aus spec) turbo BAC valves. It sets a fixed amount of air that always flows from the BAC hose through a passageway in the UIM and into the primary ports. Even if the BAC valve is off air always flows through it."

this is a quote from arghx in the FAQ on emissions.

so my understanding is that i should be fine with the BAC as long as i dont need to adjust it because the JDM manifold doesnt have a working air bypass screw on the BAC..

this is getting confusing am i understanding this correctly??????????????

 

I have an s4 T2 USDM throttlebody with s5 JDM manifolds. The screw on the BAC is the equivalent of the screw on the top of the n/a intake manifolds (s4 at least, I've never tried to adjust idle on an s5 n/a). So it's like closing that adjuster screw on an n/a intake manifold all the way. The practical implication to this is that you may need to open the primary throttle plate more so that there is sufficient idle air. And then you would have to verify that your TPS voltages are correct.

I am not sure if the JDM cars had an equivalent screw located on the throttlebody itself, like the FD.

 

ok that makes alot more sense. so esentially the air bypass screw just controls idle, so the JDM s5 mani may not have that so ihave to adjust the throttle plate to change the idle...and check tps voltages.. that clearifys this whole thing-thanks