Detonation
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Detonation
I now think I am getting detonation under load in hot weather. Happend to me twice doing 80. I supsect it might be the K/N cone, as it was superheated. Under hood temps were around 160 to 180.
Will added heat through the K/N cause detionation or should I be looking at somthing else?
Will added heat through the K/N cause detionation or should I be looking at somthing else?
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Re: Detonation
Originally posted by SilverT2
I supsect it might be the K/N cone, as it was superheated. Under hood temps were around 160 to 180.
I supsect it might be the K/N cone, as it was superheated. Under hood temps were around 160 to 180.
Will added heat through the K/N cause detionation...
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It could be bad gas, but I’d still stick with the higher octane. Run the tank as low as possible (no full-load runs in the mean time) than refill from a different place. If the problem persists, it probably not the gas.
(And get that heat shield.)
(And get that heat shield.)
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Originally posted by NZConvertible
It could be bad gas, but I’d still stick with the higher octane. Run the tank as low as possible (no full-load runs in the mean time) than refill from a different place. If the problem persists, it probably not the gas.
(And get that heat shield.)
It could be bad gas, but I’d still stick with the higher octane. Run the tank as low as possible (no full-load runs in the mean time) than refill from a different place. If the problem persists, it probably not the gas.
(And get that heat shield.)
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Originally posted by Evil Aviator
US 93 octane is equivalent to 97 octane in NZ. If a stock engine is detonating on that, then there is something very wrong.
US 93 octane is equivalent to 97 octane in NZ. If a stock engine is detonating on that, then there is something very wrong.
I have driven stock-engine S4 TII's with underhood intakes at well over 100mph with 87 octane in ambient temperatures over 100 F, and never had any detonation problems.
The fact that high intake temps increases the likelyhood of detonation is well proven. Why take the risk?
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Originally posted by NZConvertible
At 100mph, you've got no chance of hearing detonation...
The fact that high intake temps increases the likelyhood of detonation is well proven. Why take the risk?
At 100mph, you've got no chance of hearing detonation...
The fact that high intake temps increases the likelyhood of detonation is well proven. Why take the risk?
If the engine is running well, then the 93 is a waste of money, as the S4 is rated for 87 octane (91 octane in NZ lingo). Granted, his engine may need the 93 though, LOL.
BTW, there is no way that the under hood temps were 160-180 F at 80mph unless the car was being driven over the top of an erupting volcano.
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Re: Detonation
Originally posted by SilverT2
Under hood temps were around 160 to 180.
Under hood temps were around 160 to 180.
#13
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Originally posted by Evil Aviator
BTW, there is no way that the under hood temps were 160-180 F at 80mph unless the car was being driven over the top of an erupting volcano.
BTW, there is no way that the under hood temps were 160-180 F at 80mph unless the car was being driven over the top of an erupting volcano.
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The ambient outside temps were in the 70's. The car had been run for about a good 15 minutes before entering the hwy. Mind you the detonation happend when going up an incline doing 80. And once on a level ground.
Upon getting home and popping the hood I noticed the radiator hose was shaking from boiling coolant. I also could not keep my hand on the intake, 140-160 is my best guess at how hot it was compared to the outside temps.
This car also has 160k on the clock, 30k jspec turbo. Radiator had been fixed with stop leak. Could my radiator be clogged somehow?
Thanks
Upon getting home and popping the hood I noticed the radiator hose was shaking from boiling coolant. I also could not keep my hand on the intake, 140-160 is my best guess at how hot it was compared to the outside temps.
This car also has 160k on the clock, 30k jspec turbo. Radiator had been fixed with stop leak. Could my radiator be clogged somehow?
Thanks
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I found that Citgo and Kwik Fill gas gave me the least detonation. I tend to stay away from Mobil (not that bad) and Sunoco (very bad) as often as possible. What kind of exhaust do you have on the car? If your exhaust has been upgraded, you should upgrade your fuel pump to compensate, and possibly add a fuel controller.
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