When I accelerate under 3k and still in vaccum i hear this clinging sound. Im not sure if it's my intercooler pipes banging against my frame or denation. So is it possible to denoate w/o boosting?

 

yeah, how you think normal cars without turbo detonate?

 

detonation isn't something unique to only boosted cars

 

Well I dont understand how Im detonating in vaccum? My setup is a 12:1 FMU/Missing Link/MSD Inline fuel pump which should definetly suffice 5.5 PSI. Anyone got any ideas as to what could be wrong?

 

well what is detonating? mixture igniting before its supposed to. so there can be many reasons like heat, running lean, timing, tuning..

 

Do you think running colder plugs would help? Im using stockies right now.

 

what engine management are you running?

 

12:1 FMU, Inline Fuel Pump and please dont reccomend the hack or standalone

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by superduperman &raquo;</TD></TR><TR><TD CLASS="quote">Well I dont understand how Im detonating in vaccum? My setup is a 12:1 FMU/Missing Link/MSD Inline fuel pump which should definetly suffice 5.5 PSI. Anyone got any ideas as to what could be wrong?</TD></TR></TABLE>

Do you still have the stock FPR? If not, you should. Otherwise, the fuel pressure transition in vacuum will be kind of flat. The 12:1 FMU might not be able to handle smooth fuel pressure transition in vacuum. That's what the stock FPR is for.

 

whats ur ignition timing set at?

 

if your ignition timing is near 16 degrees btdc, i highly doubt you are detonating under vac.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by superduperman &raquo;</TD></TR><TR><TD CLASS="quote">Do you think running colder plugs would help? Im using stockies right now.</TD></TR></TABLE>

a possibility. a colder plug is meant to extract more heat from the chamber. have you been checking the plugs?

 

probably not detonation that low in the power band, and in vaccuum. Technically, N/A cars are probably at 0 vac/boost if they're deonating...i.e. WOT.

 

As I pay more attentino to the sound it sounds more like metal banging against metel.....kind of a quick rattling type of sound. Im starting to think it might be my intercooler pipes banging against the frame or something. Anyone else got any ideas?

 

Try wrapping some old rags around any IC pipes near the frame and go driving and see if it goes away. If you have access to some race gas flush the tank and dump in a bit and drive down the block and see if it still does it.

 

have you taken a look/listen in the engine bay and front end area while the car's idleing?

 

Yah I have and nothing seems out of the oridinary. It detonation loud?