How much boost can I run?
08-02-12, 01:05 PM
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How much boost can I run?
Hey guys got a turbo question here. I'm still fairly new to RX7s i'm coming from the 240sx world and this is where my question stems from. I have an 88 FC3S TII with an S5 TII motor I just rebuilt. I had it street ported and I rebuilt it with FD apex seals, side seals, and springs. What I'm wondering is can I safely turn the boost up with stock ecu, turbo, and injectors. If so how much? What makes me wonder this is with an SR20DET in a 240sx you can turn the boost up from 8psi to 12psi with stock everything with no problem and make a little extra power out of the box. I've heard mixed things about TIIs from the people I know so I thought I'd get everyone's thoughts on here. I have the "boost defender" thing that keeps ecu from leaning the car out during "over-boost", but I don't know if these things are reliable it just came with the car. Any thoughts on the matter would be much appreciated. Thanks in advance to everyone.
08-02-12, 08:50 PM
#5
http://www.aaroncake.net/rx-7/buy2.htm
Fuel Cut, FCD and Fuel System Modifications
The stock fuel system is programmed to prevent overboosting the car by cutting fuel past about 8.5 PSI. This system is designed to protect the engine and must be defeated if higher then stock boost is run. Fuel cut feels a bit like the car hitting a wall just after 8 PSI. The Fuel Cut Defender (or FCD) is available from most of the vendors (there is also a DIY version) to trick the ECU into thinking that the car is running less then 8.5 PSI of boost, thus avoiding fuel cut. However, the FCD does not add more fuel to the engine in response to higher boost. Because of this, just running around with high boost levels and an FCD is a very bad thing and virtually guarantees short engine life. One would hope that there is a special place in hell for those that sell a car with cranked up boost, an FCD and no other supporting fuel mods.
The stock fuel system is programmed to prevent overboosting the car by cutting fuel past about 8.5 PSI. This system is designed to protect the engine and must be defeated if higher then stock boost is run. Fuel cut feels a bit like the car hitting a wall just after 8 PSI. The Fuel Cut Defender (or FCD) is available from most of the vendors (there is also a DIY version) to trick the ECU into thinking that the car is running less then 8.5 PSI of boost, thus avoiding fuel cut. However, the FCD does not add more fuel to the engine in response to higher boost. Because of this, just running around with high boost levels and an FCD is a very bad thing and virtually guarantees short engine life. One would hope that there is a special place in hell for those that sell a car with cranked up boost, an FCD and no other supporting fuel mods.
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