turbo rotary question
03-31-2008, 12:16 PM
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turbo rotary question
Hey guys, I don't know how many of you here are like me (have owned one or more RX-7's previously) so I don't know if you guys will be able to help me with this question. I tried to get help on the RX-7 forum but didn't have much success so I thought that I try my luck here.
I have an '88 turbo 2 (tenth anniversary edition) with about 50k on the motor and about 120k on the body. The cats needed replacing when I bought the car and it was cheaper to go with a full exhaust system from racing beat as opposed to new converters (thankfully they don't test for emissions here in central IL). In addition to the wonderful exhaust note I got 50 more hp as a result of the change. However, to do this you have to essentially fool the computer (by use of a fuel cut defenser) into thinking the boost is lower than it actually is in order to avoid fuel being shut off.
When I ordered this exhaust, the tech guy on the phone at Racing Beat told me that I would not be overboosting the engine. He said that I was only going to be at a point slightly above the stock boost levels the engine was designed for. The fuel cut defenser cuts fuel at 1psi above stock which requires the use of the device. At the time I was not big into the message boards over at RX-7 club and didn't do the proper research that I should have (I was also only 19). I took the guys information at face value and continued to drive it without a second thought.
Most of the information at RX-7 club about this modification says that you really should modify the fuel system as the stock system is not capable of delivering the proper amount of fuel to the engine when more boost has been added. They say that this leaning out of the mixture is bad for the engine and can lead to engine failure. I did a compression check, before it's life as my daily driver ended, and noticed that it was well within whatever the normal pressure should be (it was awhile ago and so I don't remember the exact figures, just that it was within spec).
If the engine passed the compression check do you think that I should just move on knowing that I dodged a potential bullet? I fully intend to upgrade the fuel system in order to avoid this situation ever happening, but I am concerned that maybe I did damage by driving it this way for approximately 20k miles after I installed the new exhaust. I really don't want to do more work on an engine that is a ticking time bomb and waste both my time and money. I am not the type that drives cars too hard, but I do get into it every now and then when I want to have a little fun.
Any help or advice from you guys would be appreciated as the guys at RX-7 club don't seem to want to give me much help. Thanks!
Tim
I have an '88 turbo 2 (tenth anniversary edition) with about 50k on the motor and about 120k on the body. The cats needed replacing when I bought the car and it was cheaper to go with a full exhaust system from racing beat as opposed to new converters (thankfully they don't test for emissions here in central IL). In addition to the wonderful exhaust note I got 50 more hp as a result of the change. However, to do this you have to essentially fool the computer (by use of a fuel cut defenser) into thinking the boost is lower than it actually is in order to avoid fuel being shut off.
When I ordered this exhaust, the tech guy on the phone at Racing Beat told me that I would not be overboosting the engine. He said that I was only going to be at a point slightly above the stock boost levels the engine was designed for. The fuel cut defenser cuts fuel at 1psi above stock which requires the use of the device. At the time I was not big into the message boards over at RX-7 club and didn't do the proper research that I should have (I was also only 19). I took the guys information at face value and continued to drive it without a second thought.
Most of the information at RX-7 club about this modification says that you really should modify the fuel system as the stock system is not capable of delivering the proper amount of fuel to the engine when more boost has been added. They say that this leaning out of the mixture is bad for the engine and can lead to engine failure. I did a compression check, before it's life as my daily driver ended, and noticed that it was well within whatever the normal pressure should be (it was awhile ago and so I don't remember the exact figures, just that it was within spec).
If the engine passed the compression check do you think that I should just move on knowing that I dodged a potential bullet? I fully intend to upgrade the fuel system in order to avoid this situation ever happening, but I am concerned that maybe I did damage by driving it this way for approximately 20k miles after I installed the new exhaust. I really don't want to do more work on an engine that is a ticking time bomb and waste both my time and money. I am not the type that drives cars too hard, but I do get into it every now and then when I want to have a little fun.
Any help or advice from you guys would be appreciated as the guys at RX-7 club don't seem to want to give me much help. Thanks!
Tim
03-31-2008, 12:48 PM
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You'll be fine. That's been done that way on those cars for a long time. It's safer if you upgrade the secondary injectors but not mandatory. Just use the highest grade pump gas you can get and you'll be fine.
04-04-2008, 12:55 PM
#3
Huge hole is huge
RG speaks the truth, as usual. As long as you aren't jumping the boost a large amount, you should be OK. I think I've seen people hit 10-12 PSI on stock fuel system *though that's killing the stock turbo...*
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