jgould

Ok, I finally got my boost guage installed. If anyone can help please do!!! The car is a 1994 RX7 Touring. Ok, it was idleling at about 1500rpm. The pre-control and wastegate seleniods had the electrical connections unplugged. After I plugged them back in, it now idles at 1250. The whole time it still idles a bit rough, not too bad, just sputters every once in a while, but more when it warms up. Now that the boost gauge is installed I can see what is actually going on!!



There is absolutely no boost until about 3000rpm, when it abrubtly shoots to about 9 sometimes 11 psi, then at about 4400rpm it goes back down to around 5psi. Also, ever since I installed the boost guage, it backfires a bit more. The only mods done to this car are the ones it had when I got it, Which is straight exhaust from the pre cat back. Is it a vacuum problem? If so would it be easier to just remove all the lines and seleniods and go non-sequential?

Any Help is greatly appreciated!!!!

Joe Flo

You probably have hoses that aren't connected in the right place. Check the ones around your manifold. If you can't get it running properly sequentially then changing stuff might not help. Check your hoses first! If you need help I also live in houston and miss the sound of a running FD

Godzilla-T78

Have you done a hose job? If not do it. Also make sure the vacumme line to your map is pluged in.. also.. reset your ecu. disconnect your battery count to 50 and reconnect.. cheers.

rynberg

What's your vacuum at idle? It sounds like the previous owner was running an open exhaust on the stock ecu. The engine could be gone. Also, until you get some kind of restriction back in the exhaust system (well, the pre-cat should help there), your vacuum leaks may be the only thing keeping your boost at a safe level.



First thing first, what's your vacuum at idle? If it is low and/or erratic, the next step would be to get a compression test. There's no point in troubleshooting the turbo control system if the engine is gone anyway....

Dumbrotorkid

what should be the vac at idle??

jgould

I'll have to get a meter that reads vacuum also, I only have on that reads boost. I didnt think that the engine could be gone since It doesnt smoke one bit. Not even when it is started up. also, there is no oil in the coolant. The oil and coolant levels are always good. I thought those were all signs of an internally healthy rotary???

Danomite

[/QUOTE]what should be the vac at idle??[QUOTE]



Depends on the engine, but I have seen 15-19inHg between 4 different FD's. James was getting 18-19 before he cracked a seal...13-24 after. The high vacum shouldnt really throw off your reading as long as the TB is still closed and idle is constant.