LAST EDITED ON 02-Jan-01 AT 05:46 PM (PST)

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Do you have the FMU running off the intake manifold??

I noticed the same thing too. As with any mechanical device, response time is going to suffer vs. electronically. What I did before I went the with SAFC, is I plumbed the pressure tubing for the FMU to the compressor side of the turbo. I didn't have my wastegate connected there anymore, since I had my MBC running to it that I T'd directly off the intake manifold....better boost response. Anyway, connecting the FMU tubing direclty off the turbo will give the FMU a higher reading than what is actually present at the intake manifold b/c of the pressure loss through the intercooler. For instance, I think at the time I was boosting 7psi. The FMU was probably sensing roughly 9psi, figuring a 2psi loss through the IC. Since I did that, I didnt notice any lean spots in the A/F mixture once running into boost as I had before. Another reason why this might've helped in that the FMU will immediately sense boost. Meaning that while our cars are still in turbo lag when we intially hit it, the FMU is already getting a boost pressure and is already X-amount psi ahead of your right foot. So by the time that amount of boost pressure is coming into the intake manifold, with the original setup, the FMU would just be begining to sense a boost signal. By connecting it directly to the turbo the FMU has now already sensed that amount of boost coming into the intake and has already beefed up fuel pressure....(whew)

Patrick