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Discussion Starter #1
I now have about 800 miles on the car and I noticed a couple of times when I floor it I briefly hear a metal spinning noise. Almost like using a hand mixer in a metal bowl. Are these just regular turbo noises or is this something bad? Thanks
 

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Uh, detonation?


If you hear a sound that seems like ball bearings in a cyl then thats detonation. THis is usually heard at WOT wit a good amount of engine load.



Now if you are at WOT and get off the gas, you will hear the turbo bypass.

WHen are you hearing this?
 

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i think he is just hearing the turbo.
 

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Discussion Starter #4
I hear the noise only when I've had the gas floored. It goes away if I let up on the gas.
 

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turbo
 

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Sounds like you're talking about the turbo spooling up, my man...just enjoy it :wink:
 

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I noticed mine was detonating the second day owning it when I put my foot into it. Figured the dealer put in cheap gas and I filled the next tank with 93 and a full bottle of 104+ octane booster. On the fourth day it was still detonating, then I disconnected the neg battery terminal for a couple of hours and it cleared up.

Make sure you use minimum 91 octane gas or possible detonation can happen. If you have crap gas and then putting a load on the engine ("flooring it") could be the noise you hear (detonation that is).

Also, I don't have to floor the accelerator pedal to hear my turbo spool-up.

Hope you figure it out!
 

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WTF?

OK, I have never had to deal with detonation, so I cannot tell for sure.

I have a similar issue.
My issue only happens if I am in a gear too high for my speed and I floor it I get what I would call a chattering effect. I only use 93 octane.....

any ideas?
 

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Re: WTF?

cali said:
OK, I have never had to deal with detonation, so I cannot tell for sure.

I have a similar issue.
My issue only happens if I am in a gear too high for my speed and I floor it I get what I would call a chattering effect. I only use 93 octane.....

any ideas?
It could be what u quoted, "gear to high for the speed". I'm still learning the car (only 650 miles).I'll check mine out tomorrow and let u know.

Exhaust Depot: U got any thoughts about this?
 

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Re: WTF?

m_dunnie said:
It could be what u quoted, "gear to high for the speed". I'm still learning the car (only 650 miles).I'll check mine out tomorrow and let u know.

Exhaust Depot: U got any thoughts about this?
I hope its operator error, but im a bit spasmic since my car has issues .....
we shall find out though.
 

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Re: WTF?

cali said:
m_dunnie said:
It could be what u quoted, "gear to high for the speed". I'm still learning the car (only 650 miles).I'll check mine out tomorrow and let u know.

Exhaust Depot: U got any thoughts about this?
I hope its operator error, but im a bit spasmic since my car has issues .....
we shall find out though.
I get that same chatter and so do other SRT-4's I have test driven. Thats totally normal when you put it into to high of a gear and end up at like 1.5-2.2k rpm and push the accelerated down. You get what sounds like light knocking or chatter even. It goes away once you hit like 2.5k rpm right?
 

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Re: WTF?

IPaidForThisName said:
I get that same chatter and so do other SRT-4's I have test driven. Thats totally normal when you put it into to high of a gear and end up at like 1.5-2.2k rpm and push the accelerated down. You get what sounds like light knocking or chatter even. It goes away once you hit like 2.5k rpm right?
I have the same thing. I'll be cruising in 5th gear, and if I punch if you can hear it around 2-3k, but it goes away at full boost. I'll try and record the sound, but it isn't *that* loud and only lasts a second or 2. It sounds like pinging almost.
 

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Dr. Who said:
It's called gear chatter..... The power strokes of the engine make the gear sets chatter at that lowspeed... Almost every manual box I've driven does it - even in big diesel trucks !

Why are you driving in 5th gear at 1500 RPM anyway ? That's what that silver colored plastic thing in the center console is for - SHIFTING . hehehe
Now we're getting somewhere with this. I have on several occasions upshifted in too high of a gear and then accelerated resulting in the chatter and vibrations described and down shifting corrected it, but if u hear a pinging sound that's not a good thing!

Make sure to run good known gas for 20-30 miles then remove your neg battery teminal for a couple of hours to reset your computer. My understanding is the computer can learn and adjust to the gas, but the computer can only compensate so much if u are running really crappy gas. It worked for me, no more pinging.
 

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"NIVO88T-SRTGURL'S BF"

cali said:
OK, I have never had to deal with detonation, so I cannot tell for sure.

I have a similar issue.
My issue only happens if I am in a gear too high for my speed and I floor it I get what I would call a chattering effect. I only use 93 octane.....

any ideas?

you wanna know what detonation sounds like...find a marble and a mirror, tap on the mirror with the marble fast....thats what sound you get when you get detonation....if you heard that for longer than a few seconds...oh boy....


#1 you used low octane 87,89
#2 your boost is really high and you ran lean.

but from the factory this car should take an abuse since it's compression ratio is a stock 8:1 ratio. and having forged rods and nice pistons help also.
the low 8:1 compression ratio tells me this car is made for boosting!
i bet 400hp is no problem with these internals.as long as the right fuel and fuel pressure is added. not to mention a nice turbo, wich most probably will be the mitsu family 16G large,18G,20G etc...now just imagine a nice large 20G turbo boosting 27psi and making 400+hp at the wheels!
 
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