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Just want to find if somebody done this conversation from 7psi to 12psi – using M90. I am trying to find anything on this forum about converting Richwood kit, from 7psi to 12psi, but no too many info on it, or I just can not find it. I read about changing crank pulley, supra injectors 315cc...

Thanks cj supra and sideshow, I will do what you are suggesting with wide band kit and test plugs with half load driving without idling, need to wait for better weather, it is snow, and I have 275 summer tires, not good combination. Thanks again IAksa

I just check, there are wired to main O2 sensors (left-OX2 and right-OX1) @"check conn." or "Data Link Connector 1" - DLC1, so there are not wired on 'O2 Sub Sensors' IAksa

Thanks 'stevechumo' for analyzing my problem and giving my advice for different options. Yes, my car, starts cold without problems, and idling like a stock. One of the reason putting 315cc and expensive $360 SuperFMU was plan to go 12psi with piggy back ECU. The biggest problem and reason...

Ooops, let me double check if I am taking wires from before or after Cats for AFR's, Thank you very much, good point.

cjsupra90: I agree about LED AFR, I used it on first car, at least show me something under boost. No miss firing at all, also when one side going lean (for 1-2 sec.) engine running on same way like before, when was rich. Probably it is false reading. I check AFR wire...

I had only one RR FMU on my first car, it was regulator with only static press. that can be adjusted. I changed with Vortech Super FMU with static, vacuum, boost, bleeding, 2 different springs, 4 different rings and plates. Both of them works similar on my first car. I am having problem with...

My problem is running lean on one side of V8 under 7psi boost, after 5-6 second at 7psi. Car is running perfectly in vacuum, first sec in the boost (7psi), both side running rich. After 5-6 sec one side of v8 going from rich to lean. Let me give you more info about my set up. I had '93 sc400...

I think you (JustenGT8, NZ_V8farmer, XR8tt) are all right, broken ring. When I do compression test I can hear clicking noise coming from that cylinder. Yes, oiled plug, a lot of oil in M90 intake even I installed "catch can" and drive just 2-3 miles. It is time for high performance rebuild. I...

Thanks XR8tt I did some investigation, so far I found this: I check all old spark plugs, just one (not two) was very bad, cyl # 5. When car is running I unplug injector connector #5 - almost no difference, so does not even work. Check all spark wires with manual, everything is correct...

Oooo, they look very bad, specially on left side, specially two of them (left) third from the front of engine - very bad, and second from the front was not even tight enough - bad. Looks very bad installation, that is why I am trying to do by myself and learn. I had OEM sparks with .040-.044 gap...

My engine (1UZFE sc400 '93 with Richwood M90 kit - 7 psi, over 200K miles) problem starts 4 months ago, I will try to explain as much as I can, hopefully some one can help. First of all what was good, starting engine - ok, idling high 1100 rpm ??, shift to "D" 750 rpm. So, when problem started I...

Thanks again, When I finish this small project I will let you now with some details.

Like I said I am not experienced, but I am going to be one day :)). Let see if I am understanding a basic. I have a 1UZFE '93 w/ M90 and Richwood manifold w/ baypass valve. On pressure side of M90 I have just boost gauge and nothing else. So just Richwood manifold can be under boost - right ...

Thanks again I will definitely go with your design. After notice some oil round baypass valve and M90 (I have boost and LED A/F gauge in car), also notice that driver side of V8 going lean at 6-7 psi. Like you said "oil increases the chances of detonation" - that 's what happened. Few weeks...

Thanks Yes, I have M90's bypass valve (comes w/ Richwood M90 kit), also I have right now hose connected from driver side valve cover vent with PCV valve, and hose from passenger side valve cover vent to the bottom of throttle body. All those hoses I will reroute like you explained with " catch...

Thanks Thank you very much. So, let me see if I understand all instruction correctly because I am not too experienced. - plug off connection at the intake manifold (back side of M90 - close to M90) - plug off connection at the bottom of throttle body where passenger valve cover vent goes -...

Hi everyone, Recently I notice some problem with my car and found engine oil in air intake (M90 with Richwood 7 psi kit). I think oil coming in air intake from small hose from bottom of engine (I will check where is connected) and it is connected to "P" on throttle body. Is anybody now what...

I fix it, by myself Nobody wants to help ?:frown: OK, I fix it by myself, this is what was a problem and what I did. My valve cover was leaking on catalytic convertor making smoke, bad idle when is a cold and noise from S/C M90 under boost. I get parts from dealer: valve cover gasket, valve...

Hi everyone, I have problem with my SC400 '93 210k miles with M90 s/c (Richwood manifold) + FMU, everything else stock, all sensors original. Car was running very good for 2 years, the only problem that I had was some smell, like gas when car stop and poor idle when car is cold. I found that...