Dyno tune question.
09-19-2008, 08:53 PM
#1
Instructor
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Member Since: Dec 2006
Location: D'Iberville Mississippi
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Dyno tune question.
Hey guys whats up?. about a month ago I brought my car to Thunder Racing to have a H/C install. I went with the TR 230/224 reverse split cam and PRC 5.3 2.5 heads milled to 60cc. When Thunder Racing was tuning my car he said that the car was picking up a knock and retarting my timing. He thought maybe it was a false knock so he backed the timing down. When he done this and did another dyno run he said the knock went away therfore he said it was not a false knock and that the knock module was picking up a real noise. He said the most likely cause of the knock is from detonation. Saying that the compression might be to high and causing this to happen. It dyno'ed at 389 at the rear wheels but he told be that he has a safe tune on my car because of the detonation. He said the timing is only about 75% of where he would like it so the engine has more power there but just not able to use it. Do u guys have any thoughts on my situation. I hate knowing that I have more power there and cant use it. Any suggestions?
09-19-2008, 09:40 PM
#2
Tech Contributor
Sounds right to me. Milled heads and an aggressive cam is means for detonation. Other things that could cause detonation are carbon build up on the pistons, too high heat range plug. Low octane. That's why it's nice to have tuning software. You have to take the time to learn some things about it but it's well worth the investment in time and money. You can log and make changes as needed after investigating and trying different things. If they didn't degree the cam in, your valve timing could be off and building cylinder pressure too early or something.
09-20-2008, 10:53 AM
#5
Burning Brakes
tune
Too much compression for todays gas. Get some Torco concentrate
and add about a gt. and the knock should go away. You have 11.2 cr
with a stock head gasket. Thinner of course would be higher.
and add about a gt. and the knock should go away. You have 11.2 cr
with a stock head gasket. Thinner of course would be higher.
