Predetonation
11-20-07, 10:09 PM
#1
Ryan
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Location: Las Cruces, New Mexico
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Predetonation
Can someone tell me how to avoid predetonation and how i can tell if it happens?
is it like a backfire or is it completely different.
i have an 88 TII list of mods are
2mm ceramic apex seals
Street/Semi-Race Port
Rtec 1.8
860cc injectors
upgraded fuel pump
turbonetics compressor housing
Garrett center section
3" to 2.75" turbo back exhaust
Ported upper and lower intake manifolds
Ported throttle body
any ideas at a round about hp im looking at?
is it like a backfire or is it completely different.
i have an 88 TII list of mods are
2mm ceramic apex seals
Street/Semi-Race Port
Rtec 1.8
860cc injectors
upgraded fuel pump
turbonetics compressor housing
Garrett center section
3" to 2.75" turbo back exhaust
Ported upper and lower intake manifolds
Ported throttle body
any ideas at a round about hp im looking at?
Not gonna say it!
11-20-07, 10:53 PM
#4
Keep the motor cool, this can be done by reliability mods, DONT FORGET Charge Air temp also.. IE Intercooler
Keep your AFR's in check under boost, depending on porting and boost you want to keep it below 12:1 under boost, the more boost the richer you want to go.
Dont go crazy with the timing, this is the easiest way to pop a motor. set timing depending on your porting and boost
Keep your AFR's in check under boost, depending on porting and boost you want to keep it below 12:1 under boost, the more boost the richer you want to go.
Dont go crazy with the timing, this is the easiest way to pop a motor. set timing depending on your porting and boost
11-20-07, 11:03 PM
#5
Ryan
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Keep the motor cool, this can be done by reliability mods, DONT FORGET Charge Air temp also.. IE Intercooler
Keep your AFR's in check under boost, depending on porting and boost you want to keep it below 12:1 under boost, the more boost the richer you want to go.
Dont go crazy with the timing, this is the easiest way to pop a motor. set timing depending on your porting and boost
Keep your AFR's in check under boost, depending on porting and boost you want to keep it below 12:1 under boost, the more boost the richer you want to go.
Dont go crazy with the timing, this is the easiest way to pop a motor. set timing depending on your porting and boost
11-20-07, 11:31 PM
#6
Can someone tell me how to avoid predetonation and how i can tell if it happens?
is it like a backfire or is it completely different.
i have an 88 TII list of mods are
2mm ceramic apex seals
Street/Semi-Race Port
Rtec 1.8
860cc injectors
upgraded fuel pump
turbonetics compressor housing
Garrett center section
3" to 2.75" turbo back exhaust
Ported upper and lower intake manifolds
Ported throttle body
any ideas at a round about hp im looking at?
is it like a backfire or is it completely different.
i have an 88 TII list of mods are
2mm ceramic apex seals
Street/Semi-Race Port
Rtec 1.8
860cc injectors
upgraded fuel pump
turbonetics compressor housing
Garrett center section
3" to 2.75" turbo back exhaust
Ported upper and lower intake manifolds
Ported throttle body
any ideas at a round about hp im looking at?
11-21-07, 12:37 AM
#7
Ryan
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well,
Detonation (also called "spark knock") is an erratic form of combustion that can cause head gasket failure as well as other engine damage. Detonation occurs when excessive heat and pressure in the combustion chamber cause the air/fuel mixture to autoignite. This produces multiple flame fronts within the combustion chamber instead of a single flame kernel. When these multiple flames collide, they do so with explosive force that produces a sudden rise in cylinder pressure accompanied by a sharp metallic pinging or knocking noise. The hammer-like shock waves created by detonation subject the head gasket, piston, rings, spark plug and rod bearings to severe overloading.
but not pistons ha.
Detonation (also called "spark knock") is an erratic form of combustion that can cause head gasket failure as well as other engine damage. Detonation occurs when excessive heat and pressure in the combustion chamber cause the air/fuel mixture to autoignite. This produces multiple flame fronts within the combustion chamber instead of a single flame kernel. When these multiple flames collide, they do so with explosive force that produces a sudden rise in cylinder pressure accompanied by a sharp metallic pinging or knocking noise. The hammer-like shock waves created by detonation subject the head gasket, piston, rings, spark plug and rod bearings to severe overloading.
but not pistons ha.
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11-21-07, 12:43 AM
#8
Ryan
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welllll i guess never mind about the pre detonation
http://www.misterfixit.com/deton.htm
but im still curious about the hp.
any guesses opinions whatever?
http://www.misterfixit.com/deton.htm
but im still curious about the hp.
any guesses opinions whatever?
11-21-07, 06:23 AM
#11
Ryan
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11-21-07, 09:49 AM
#12
Will work for horsepower
Thats why i wasn't going to say it! The best advice i know of is to get a profesinal tune and ask any questions you have of him. 
And pre-detonation is what you want, always.
And pre-detonation is what you want, always.
11-21-07, 10:09 AM
#13
Ryan
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i had the name of it wrong. thats all. i was talking about detonation. where your engine "pops" im new at all this.
11-21-07, 08:56 PM
#15
Will work for horsepower
From what i have experienced it hard to hear the rotary ping and if you do its to close or already to late. But if your talking about a back fire out the exhaust thats almost normal!
11-22-07, 12:38 AM
#16
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i have an 88 TII list of mods are
2mm ceramic apex seals
Street/Semi-Race Port
Rtec 1.8
860cc injectors
upgraded fuel pump
turbonetics compressor housing
Garrett center section
3" to 2.75" turbo back exhaust
Ported upper and lower intake manifolds
Ported throttle body
any ideas at a round about hp im looking at?
2mm ceramic apex seals
Street/Semi-Race Port
Rtec 1.8
860cc injectors
upgraded fuel pump
turbonetics compressor housing
Garrett center section
3" to 2.75" turbo back exhaust
Ported upper and lower intake manifolds
Ported throttle body
any ideas at a round about hp im looking at?
???
11-22-07, 08:52 PM
#17
Ryan
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whatever.
thats what i was told im totally new at this.
and as far as the ping goes im not necessarily talking about ping.
i just dont wanna **** my car up super fast.
and the engine exploding thing. i know that detonation isnt the only thing to do that like boost creeps all kinds of things. but yeah.
thats what i was told im totally new at this.
and as far as the ping goes im not necessarily talking about ping.
i just dont wanna **** my car up super fast.
and the engine exploding thing. i know that detonation isnt the only thing to do that like boost creeps all kinds of things. but yeah.
11-22-07, 11:17 PM
#19
Lives on the Forum
You're running apex seals that cost around $1,000 or more...at least for the good, quality / well-known brands.
Dunno what "semi race port" means...?
You've got fuel injectors that barely can support 350 at the wheels.
You're running a modded STOCK ECU.
And just a compressor upgrade / hybrid...?
This kind of combination is not common.
Hell, I don't think I've ever heard of anyone running such a combination on here.
So, either the owner is very rich, very paranoid, or very ignorant...
This is why I'm suspicious of the post...
-Ted
Dunno what "semi race port" means...?
You've got fuel injectors that barely can support 350 at the wheels.
You're running a modded STOCK ECU.
And just a compressor upgrade / hybrid...?
This kind of combination is not common.
Hell, I don't think I've ever heard of anyone running such a combination on here.
So, either the owner is very rich, very paranoid, or very ignorant...
This is why I'm suspicious of the post...
-Ted
11-23-07, 08:07 PM
#20
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#1 have a good tunner (make sure you never lean out but dont go to rich either), #2 keep your ignition in good shape, if your WOT hard all the time check your injectors frequently.
#3 always make sure you have enough fuel for the application. Never be cheap cause it will be more expensive in the end!
oh and listen for the hesitation sound when it happens( sounds like when you hit the rev limiter)
#3 always make sure you have enough fuel for the application. Never be cheap cause it will be more expensive in the end!
oh and listen for the hesitation sound when it happens( sounds like when you hit the rev limiter)
11-26-07, 06:25 PM
#21
Ryan
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You're running apex seals that cost around $1,000 or more...at least for the good, quality / well-known brands.
Dunno what "semi race port" means...?
You've got fuel injectors that barely can support 350 at the wheels.
You're running a modded STOCK ECU.
And just a compressor upgrade / hybrid...?
This kind of combination is not common.
Hell, I don't think I've ever heard of anyone running such a combination on here.
So, either the owner is very rich, very paranoid, or very ignorant...
This is why I'm suspicious of the post...
-Ted
Dunno what "semi race port" means...?
You've got fuel injectors that barely can support 350 at the wheels.
You're running a modded STOCK ECU.
And just a compressor upgrade / hybrid...?
This kind of combination is not common.
Hell, I don't think I've ever heard of anyone running such a combination on here.
So, either the owner is very rich, very paranoid, or very ignorant...
This is why I'm suspicious of the post...
-Ted
so an rtec or how ever you spell it is a modded stock ecu?
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