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Knock & timing retard at high RPM (Vortech)

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Old Dec 24, 2007 | 03:29 AM
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moog's Avatar
moog
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Default Knock & timing retard at high RPM (Vortech)

So I went to get a few runs after fixing my belt slip issue. It looks as though my UTEC is sensing a bit of knock after 5.5k rpm and pulling timing which kills power. I'm not sure if it was just a bad batch of gas, but I only hit like 345whp. My tuner said supercharged cars tend to sense false knock or something. Anyone have input on this? He should be emailing me the graphs soon, so I'll post those up.

My mods:

Vortech w/ 3.12 pulley
Skunk2 plenum
Berk high flow cats
Top Speed Y-pipe
Fujitsubo exhaust
RC 440 Injectors
Walbro Fuel pump
stock cams

I'm going to swap out my plugs this week. Also fix this slight exhaust leak I have since installing the cats last week. The leak, while very minimal, might trigger false knock count from what I've been told.
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Old Dec 25, 2007 | 06:14 PM
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Ziggyrama
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From: Northboro, MA
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Originally Posted by moog
I'm going to swap out my plugs this week. Also fix this slight exhaust leak I have since installing the cats last week. The leak, while very minimal, might trigger false knock count from what I've been told.
You can build some det cans and verify with your ears if you're getting real knock. Metal tube bolted to the block, with rubber hose attached to that running into ear pieces and you're good to go. Search for det cans and you'll see what I mean.
That or buy knock lite and see if it also reports knock. There's a lot of noise in the engine bay in high RPMs so that may produce false readings. I don't see how a minor exhaust leak can trigger false knock positives. The frequency that shows up as knock is quite distinctive.
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