I just got my car running yesterday. The problem is it idles pretty high, usually 2500-3000 on the KA tach, and breaks up at more than partial throttle. if you give it 1/4 throttle, it will rev up and make some boost.
I'm guessing it's either the TPS wiring, a vaccum leak, or some other wiring problem. It seems to run ok otherwise. If it's a vacuum leak, I can't find it. I pressurized all of my intercooler piping, and the intake manifold and I couldn't find any noticeable leaks. I hooked up a gauge and it reads almost 20 in HG at idle. Most of the vacuum lines are new. The modifications are Greddy manifold, Q45 TB, Hybrid FMIC, Apexi filter, and open downpipe. On the Q45 TB, I'm not sure the TPS wiring is right, I'm using the one plug that comes off, anyone know the right way to do it? My stock turbo is wasted, but I don't think that's the problem, it still makes boost.
Also, is it a bad idea to drive the car with chipped compressor blades? Will it self-destruct and cause more damage? Anyone have a stock RB turbo or know where I can get a new compressor wheel? TIA
My Problems
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goofynick6
- Posts: 1216
- Joined: Thu Feb 05, 2004 9:58 am
- Car: 1995 S14.5 RB20DET
goofynick6 wrote:Q45 TPS uses a backwards voltage reading from a normal tps, so it reads like 4.5volts at closed instead of .5.
thanks for the info, I didn't know that. So how do I get that to work? How have other people done it? My stock RB25 Series II TPS was different. Anyone have a picture of the inside of an older RB TPS?
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goofynick6
- Posts: 1216
- Joined: Thu Feb 05, 2004 9:58 am
- Car: 1995 S14.5 RB20DET
Cvc, which q45 TB do you have? does the TPS look like the one on the right here?: http://rb25det.org/rb/tps.jpg
I am getting an error code when I hook it up correctly. I think we have the same problem.
It looks like the 96 Q45 TPS(s) will plug into the SII harness but I do not know if the TB bolts on.
I am getting an error code when I hook it up correctly. I think we have the same problem.
It looks like the 96 Q45 TPS(s) will plug into the SII harness but I do not know if the TB bolts on.
My computer has no screw or led or anything. I even opened it up and nothing. I just checked my Q45 TPS and it definitely shows 5V closed and .5 at WOT. BUT, I also checked the stock RB TPS and it is the same, 5V @ idle, .5 WOT. I started it with the RB TPS and it ran the same. Also, I checked the middle TPS signal wire on the unplugged harness and it shows 4.5V with the TPS unplugged. WTF? Is that right? All I changed with the tps wiring is splicing the Q45 plug.
I've searched everywhere and could find zero information about using the Q45 TPS
I've searched everywhere and could find zero information about using the Q45 TPS
DO you have the rb25det FSM, i didn't see it on your site.eh? wrote:Strange, I will check mine today. The r33 fsm states .5v at idle but doesn't specify SI or SII. This may be a another difference between the two.
Quote »I just got my car running yesterday. The problem is it idles pretty high, usually 2500-3000 on the KA tach, and breaks up at more than partial throttle. if you give it 1/4 throttle, it will rev up and make some boost. I'm guessing it's either the TPS wiring, a vaccum leak, or some other wiring problem. It seems to run ok otherwise. If it's a vacuum leak, I can't find it. I pressurized all of my intercooler piping, and the intake manifold and I couldn't find any noticeable leaks. I hooked up a gauge and it reads almost 20 in HG at idle. Most of the vacuum lines are new. The modifications are Greddy manifold, Q45 TB, Hybrid FMIC, Apexi filter, and open downpipe. On the Q45 TB, I'm not sure the TPS wiring is right, I'm using the one plug that comes off, anyone know the right way to do it? My stock turbo is wasted, but I don't think that's the problem, it still makes boost. Also, is it a bad idea to drive the car with chipped compressor blades? Will it self-destruct and cause more damage? Anyone have a stock RB turbo or know where I can get a new compressor wheel? TIA[/quote] I'm sure my thinking is wrong but, wouldn't you need something like a S-AFC if you use a non-RB TB?
cvc9216 wrote:OK, well that's good I guess. At least that's probably not my problem
One more question, if you unplug the harness from the TPS, does the middle wire in the harness plug have voltage?
Yes I do, I forgot the exact amount though i think ~2v. I don't see why it does. How bout you?I should also mention I'm getting a code 43 which is TPS sys.
Quote »DO you have the rb25det FSM, i didn't see it on your site.[/quote] I have a hard copy not a ESM. You'd need the safc for an afm not a tps.
Yes, it now reads .5 at idle and 4.6 at WOT. Try switching around your wires. My harness is all wrapped up so I don't remember which wire colors go where. If you can't figure it out let me know and I'll unwrap it and check.
FYI if anyone is interested the part number for the Q45 TB gasket is 16175-61U00. I tried twice to make my own and they both leaked a little, so I went with OEM.
FYI if anyone is interested the part number for the Q45 TB gasket is 16175-61U00. I tried twice to make my own and they both leaked a little, so I went with OEM.
