Help LT1 DETONATING!!!
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Launching!
Joined: Feb 2005
Posts: 254
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Help LT1 DETONATING!!! A good friend of mine has a 1995 Z28 a4 bone stock on a NOS wet efi kit, tr6 
and as soon as you gas it on spray it detonates bad all motor its fine but even on a 50 shot it detonates. What could the problem be? I cant figure it out 
. Unless some LT1's came from the factory with A LOT of timing.
and as soon as you gas it on spray it detonates bad all motor its fine but even on a 50 shot it detonates. What could the problem be? I cant figure it out . Unless some LT1's came from the factory with A LOT of timing. try the race gas first. if that works look at getting a timing retard. the opti may be getting ready to take a dump also, or its vacuum system is clogged. maybe try a seafoam treatment to clean the combustion chambers also.
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FormerVendor
Joined: Apr 2005
Posts: 864
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From: Wichita Falls,Tx
I would recommend checking the jetting, checking the timing, inspecting the opti, and checking the fuel side of the nitrous system to make sure fuel is getting through the nozzle. Also, lower the gap on the plugs to .035".
What do the plugs look like? Also, if you can, see what the knock sensors are doing when you use the nitrous. Sometimes people think they are hearing detonation when it's really something else in the engine.
What do the plugs look like? Also, if you can, see what the knock sensors are doing when you use the nitrous. Sometimes people think they are hearing detonation when it's really something else in the engine.
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On The Tree
Joined: Jul 2002
Posts: 179
Likes: 1
From: Choctaw, OK
Definitely check the fuel pressure. If the car still has the stock fuel pump (especially with a lot of miles on it) it is probably time to upgrade to a 255lph pump and put in a new fuel filter.
Dave
Dave
If 50hp is causing it to detonate then you have to not be getting the proper fuel if any. The stock fuel system should support up to 100-125 with no problem. Take the fuel line off the nozzle and put it in a bucket. With the nitrous bottle off activate the system and see if fuel is there. If you truly detonate it bad enough to hear it while it's under load you'll hurt something on the stock motor. As Jeremy said you might want to log it and make sure it is knock.