1979-1993 & 94 Conv [Subscribe to Daily Digest] |
Hi Bob, the '89 up ECU's seem to be more forgiving but if you hold the boost high enough for a long enough period of time it will shut the injectors down and "dash in your face" will ultimately happen. Marty just sent Jeff Cunningham the cure for this (compliments of Brad in Kansas City) not realizing that Jeff's car is a pre-'89 model. Here's Marty's message that does apply to your application! "I will be writing a piece on the resistor workaround for overboost-cut out. But here's the deal. The ECU air flow from the AMM as a variable voltage. Adding a resistor drops the voltage range, fooling the ECU into thinking the motor is flowing less air than it really is, thereby preventing it from reaching the point set for over boost. But be aware that this also means the ECU will be delivering less fuel. IT WILL BE LEANER. So you need to go richer with more fuel pressure and/or larger fuel injectors to compensate. I'm currently playing with this scenario on our test mule ('89 9000T Automatic) and don't have it all worked out yet.
Current setup: 210 ohm resistor Larger blue 24 lb/hr injectors 75-80 psi fuel pressure 22-24 lbs of boost I have only hit overboost once on the first run on a cool night. After a little heat build up in the intercooler, the air mass was just enough lower to keep below the cutout point. But it's a tad too lean as evidenced by ping and the APC dropping boost to 15 psi. Next step is to up the fuel pressure, then the larger 30 lb/hr red injectors if necessary. I don't believe the wattage rating of the resistor(s) is important. Not enough current to matter. Just pay attention to the resistance value. There, I've done the write up all ready. Hope this helps." Marty / SPG9 Techsupport. Anyway give Marty a call if you have any questions and we can also figure out something on some red injectors for you if you end up needing them. Thanks, Dave.
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