I've got an 86 turbo with a manual boost control a K&N filter kit and a HKS cat-back exhaust . I can only adjust it so far until the engine breaks up or studders a little. It doesn't sound like like pinging so is this detonation? When i dial back the boost control a little it goes away. I always use high octane gas. Would a downpipe or colder plugs allow me to use more boost?
Last edited by Player1 : May 30th, 2004 at 10:59 PM.
This is a really low tech answer but the manual boost has a dial you turn. The less threads left showing the more the boost. I have to keep about five threads showing to keep the detonation down. I don't have a boost gauge except for the stock one on the car. The gauge goes past 7 and into the red.
Last edited by Player1 : May 30th, 2004 at 10:42 PM.
Yes , definitely get a real boost guage.
I'm running 15 psi with no issues , so you must be spiking quite a bit beyond that. I'd say you were getting into some MAF over-run , which will probably happen around 17-18 psi , I haven't tested that theory yet , though. Be careful , the studdering can be a side effect of the knock sensor wigging out because of knock and pulling timing into the negative. You may or may not actually hear the knock , depending on if the knock is in a cylinder near the firewall. Be careful with that , because knock WILL kill the stock head gaskets , for one , and heavy knock in even one cylinder WILL melt the piston.
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1992 Yamaha FZR 1000. 145 Hp, all stock..
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