My procharger setup know has about a thousand miles on it now. The DFMU was tuned at a very good tuner here locally and was left in rich state(air/fuel was below 11.0 after 5000 rpms and went to an 11.3 near redline) to avoid detonation. Now I hear the same noise every time I rev to 6000 rpms but only after the car has completely warmed up. Also, the noise is only present in third fourth and fifth gears. I wouldn't know about sixth gear! The noise sounds like metal or aluminum cans vibrating or slightly banging together. I can pin point the noise the the area of the motor directly in front of the gauges/nav. compartment. It is hard to tell if it is detonation or the clutch. As soon as I change gears or let off gas it goes away. When I Press the clutch in, while I hear the noise the clutch feels as if it is vibrating slightly. Anyone ever heard detonation? What does it sound like? Did anyones clutch make noises at high rpms before it failed? Next step is TS reflash and PE 380cc injector if I can find them.
MIKE

 

detonation sounds like alot of little bb's rattling in a can.

 

Sounds like detonation to me. Lay off the boost for a while until you retune it and/or get something to fix the timing. Good thing you heard it before it's too late.

 

Fluidz,
The BB's sound is what I thought. So far half the people that have heard the noise in person have said it is detonation and the other half said it might be the clutch. It really does it when the motor is starting to make power like in thrid and fourth gears.

 

Jesseenglish,
Do you think that if detonation has been heard that it might have already damaged something?

 

I don't see how it could be the clutch. Seems like if you had a clutch problem, it would be most prevalent when when the most work is being expected out of it. Clutch is just spinning at 6000 RPM, not really doing any work. Plus the fact that you say the sound is most prevalent in the higher gears when the engine is working it's hardest would lead me to believe it's detonation.

I believe the clutch vibration is a symptom of the detonation not the other way round.

 

The motor doesn't make more power in higher gears.

It should detonate in first and second too though... if thats what it is. Have you tried warming the car up and then taking it to 6000 in 2nd?

Better still..take it to the tuner just in case. Forums are more speculation than fact. And that's one expensive piece of engine you have there.

 

I think most people who blew their engines never heard the noise. It was already too late because it was so severe. Have you seen the pictures of the blown engines. They're not pretty. Probably mild detonation, but too much will certainly weaken your valves, ring lands, rings, rod bearings etc.

You'd need to have a compression check done to know for sure. Does your car seem to have less power when not on boost or idle rougher than before you heard the noise.

One word of advice. Don't let it happen again. Sorry we're the bearers of bad news, but you definitely need to get this problem fixed even if it does turn out to be a clutch problem, severe vibration of the crank at high RPMS will cause failures.

 

No it doesn't make more power, but you're higher gearing causes the engine to work harder than the lower gears. Why do you think you can accelerate through the RPM range faster in first than you can in fifth. It's because the engine is working harder.

Plus, if it was a clutch/flywheel problem, you'd definitely hear/feel it in first and second because the engine is spinning at the same speed no matter what gear you're in.

 

Jesseenglish,
My car seems to run fine even when cruising around not in boost. The idle has always been rough or have slight 100-200 rpms drops even before the charger was installed. To be honest it does sound like the motor but I didn't want to admit it.

 

Mine does the same thing at idle, drops 100-200 RPM every once in a while. I'd put money down that it's detonation, but I don't want you to run your engine again to test it.

 

It sounds like the same exact thing EJ has which was ruled as detonation above 5k's by a tuner. It doesn't matter how rich you are you didn't retard the timing. Pull a plug and run a leak down ASAP and stay under 4k RPM's until you find out, I don't think it is the clutch either I think it is detonation due to timing.

 

jesseenglish,
I won't try it again. Ravaz rode in my car last weekend and we both feel the same way. TS reflash and injectors are soon to come.

 

Do you have a J&S box installed? If not that would probably be the thing to do--it will pull timing and if it senses problems doesn't it react somehow and/or flash a light or something?

--Steve

 

all the detonation sounds i have heard are always in the 3rd,fourth gear.........my dads 2003 E55 detonates in 3rd, his XJR did it to in the higher gears and now his MINI cooper S in 4th gear..........get your car tuned, get something to retard your timing, run 1 step colder plugs and run good fu*king gas and you should fix the problem..........does not sound like its a clutch and if it was I would not worry about it being the clutch right now, I would make myself beleive it was detonation and rule that out first foresure. Keep her easy on boost untill you do all the above first or most likely ........KABOOM!.

 

Zimbo,
I am not running any timing retard as of now. My ECU is going to TS next week for supercharger tuning. I am also going to trash the DFMU and Pump supplied by the ATI kit. The 380cc injectors will also be installed. John at J and S would never sell me the unit. He said he would make it and ship but never did. He won't even return emails.

Fluidz,
I already have colder plugs and have been tuned properly. My timing curve is still stock since John at J and S keeps dicking around. It is his lose now since I have turned to TS for my timing solution. I live in NC and we have 93 octane gas so that wouldn't fix it. You are correct about the gear issue. My car does it in 3 and 4 gears. For now the car is parked and will soon be fixed.

 

Cant go wrong with P.E. amd T.S just look at Mine, Zed's and CJ's (Spazpilot) all PE/TS no problems and mine is 5k miles on the setup driven hard ALL THE WAY UP TO 11 psi CURRENTLY 9 PSI with perfect A/F and timing, good decision bro!

 

12sec,
A while back I had seen your A/F ratios and was very impressed. I can't wait to get the reflash, planning on removing it from car this weekend. It really sucks that nobody can get Pe 380cc injectors right now due to backorder. Any how I spoke with TS today and they said it is OK to go ahead with supercharger reflash and leave the DFMU/pump in place until the 380's become avaliable.

 

mprowe350, how are you coordinating the iterative ECU tuning with Technosquare? In other words, how are they going to know how to program the fuel maps without actually having your car on the dyno?

--Steve

 

We are going to tune it with the SAFC, the TS flash is going to come rich most likely so the AFC will take care of the rest. Just going to go a few % lean.