Thread: Detonation issues

I've been having a strange problem lately. When my car isn't fully warmed up 100%, I get detonation when I get into boost. When the car is completely warm, it does not do it. It dosen't make sense (to me at least) why it would detonate when its cold as opposed to when its fully warmed up since heat causes detonation. Im running a jwt ecu 370s @ 3bar w/ n60 maf and 9.5:1 comp. Im only running a t25 @ 9ish psi depending on outside temp. It does however spike to 13-14ish at first, then levels off.

Now I know I should do something about the spike as my wastegate signal line is kind of long. Before anyone asks what my a/f ratios are, idk as I dont have a wideband. I make sure I only boost when the coolant temp needle is exactly @ operating temp, Im just curious why it only does this when its cold and not warm?

You need to find out what your afr's are. What is the base timing set to? Can you datalog?

Base timing is 15*. Can't datalog tho

yeah your afrs could be causing that

I have had several jwt tunes that did not run well prior to warm up.

What do your plugs look like?

my JWT tune runs like poo when in-between warm. When the gauge is pegged at cold, the car runs fine. When the needle barely starts to move, you feel the computer pull timing. A lot of it. The car runs gutless until it gets to operating temp, then it runs perfect. I thought JWT just ran the map this way to prevent too much load on a cold engine.

Mine does the same things as well. I just contributed it to turbo motors being grumpy in the morning haha

On cold start my car would sort of seem like its missing a little bit and be sluggish but I wouldn't even try to get into boost until my car is completely warmed up regardless and it was fine then. Its just like those idiots in srt-4's to start their car up when its cold and start bouncing it off the rev limiter then launch. That's how you destroy an engine. I make sure mine is nice and warm before it see's boost.

Just an update in case anyone cares, I recently did a tune up on the the car and I havent had the problem since. New plugs, wires, dizzy cap and rotor, and a new fuel filter. The filter that was on there was kinda old and it was the small stock one, so maybe this might have caused a lean condition? Gotta new z32 filter on there now.