Newbie Intro and questions
I just purchased a 90 turbo miata this week. All in all it seems like a great car, but I have one issue I need to ask about. Thought this would be a good place to do that. It has a Greddy turbo and intake filter, vortech, JDM catback 2.5" exhaust, Racing beat suspension, tokico shocks, Racing Beat front nose and skirts, carbon fiber hood, aftermarket 15" tires and wheels, blah blah blah. The PO spent a bunch of money on the car and I guess lost interest, so I got a pretty good deal I guess. I am in NC, between Charlotte and Asheville. The turbo needs a heat shield or blanket, right now I've just got some insulation over it to protect the M/C and heater hoses. When you get on it, above 4000 when the turbo kicks in it seems to pull pretty well all the way to redline, but if you floor it, it will spool up, then buck like it's running out of fuel, it will go up, then buck, up, buck, in a cycle. If you back off a bit, it smoothes out. I asked the PO if he had this problem and he said it needed 1.8 injectors, the stock ones wouldn't flow enough fuel. This makes sense to me, but I thought the Greddy base kit only was 4-5 psi and that the stock injectors were sufficient. I don't have a boost gauge installed yet, so I don't know what the boost is. Could I be building more boost than the 4-5 psi? I'm a little confused about if the boost stays constant if you let off the gas a bit, or does it change. I guess I'm asking is boost constant with rpm only, or is it dependent on throttle position AND rpm? Could it be afm related, I don't think there is a blow off valve anywhere in the system, do I need one? What about fuel management or timing controllers, I've read the bipes is programmable. I don't have any literature on the greddy kit, so I don't know what all is changed from the stock configuration and where to start troubleshooting. Any suggestions would be appreciated. I've been browsing the faq area and doing some searches, but haven't found exactly what I'm needing, so I thought I would ask here. Any install literature on the greddy would be great. Also any miata members in the Shelby, Forest City, NC area give me a yell, I'd love to meet some of you and get some tips and tricks.
Thanks, Richard G.
Last edited by rlg999; 03-29-2008 at 07:40 PM.