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Old 05-13-2003, 11:36 AM   #1
RiftsWRX
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'07 Honda FIT sport (5MT)

Default question for built motor/stroker motor people

Obviously, all of us have some form of engine management or another. My question is, how noisy are your motors? Running the UTEC, I've been desensitizing the knock control system severely in order to get it to not pick up stuff like piston rock, slap, etc.

I got a someone stable 93 map, but would get knock picked up on transient acceleration, tip in, and (get this) 1st gear and partial second gear romps... But.... 3rd gear (go figure) runs quiet to even the knock link..

So...... I figure, I have a decent 93... if it IS knock, then a healthy tank of 100 octane would fix it.

It didn't... it still "knocks" in all the same places, at all the same rev ranges, so I can only assume (and have been dialing it back accordingly) that it's all engine and valve train noise.

I just wanted to know if this is similar to what others have experianced. The knock link also starts to glow all the way up to the yellows. as well (full sensativity)

Before I start turning THAT down, I'd like to hear what the general concensus is.

Thanks,
Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 05-14-2003, 03:27 AM   #2
MJU1983
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05 Vette & 05 STi (sold)

Default

forged pistons make noise...
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Old 05-14-2003, 03:31 AM   #3
Pavlo
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Default get some det cans!

You need to get/buy some det cans my friend. I made mine with a pair of ear defenders, some fuel hose, and some copper water pipe flattened at one end then drilled/slotted.

You need to be able to hear the engine for yourself to determine what the knock is, you will be surprised at what you can hear. You can pick out the injectors firing, noisey followers, pistons and detonation. You will also hear the start of detonation before the knock sensor, and may pick up some det that you don't hear in the cabin, and the UTEC doesn't pick up at all.

Paul
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Old 05-14-2003, 04:43 AM   #4
mlambert
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That is top notch advice pavlo!
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Old 05-14-2003, 09:57 AM   #5
hotsam
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Water Injection
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Old 05-14-2003, 10:34 AM   #6
Red Rocket
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Default

Isn't the factory knock sensor tuned to ignore false knock or be less sensitive at certain frequencies? By building it, and changing the resonances and rpms where the motor makes noise, your factory knock sensor is no longer effective.

Kevin
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Old 05-14-2003, 11:48 AM   #7
RiftsWRX
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Default Re: get some det cans!

Quote:
Originally posted by Pavlo
You need to get/buy some det cans my friend. I made mine with a pair of ear defenders, some fuel hose, and some copper water pipe flattened at one end then drilled/slotted.

You need to be able to hear the engine for yourself to determine what the knock is, you will be surprised at what you can hear. You can pick out the injectors firing, noisey followers, pistons and detonation. You will also hear the start of detonation before the knock sensor, and may pick up some det that you don't hear in the cabin, and the UTEC doesn't pick up at all.

Paul
Yeah, I was borrowing TXS's for a while, but had to give it back. But we're working that one out, so I'll have the headphones on again, soon!

For now, I've been doing a test with 100 octane to see what's what... I had the 93 map "close", the 100 map did the same thing, so I've been logging my rear off with the deltadash (watching knock sensor activity), and have been slowly dialing back the knock system to compensate for the noise. I finally got it, and realize that I can now run a LOT more timing then I was a day before.

Also swapping out plugs helped a LOT. The coppers didn't even last 3k miles before freaking out.

IK22's are a huge difference.

More soon.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 05-14-2003, 01:35 PM   #8
savka
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Default Re: get some det cans!

Quote:
Originally posted by Pavlo
You need to get/buy some det cans my friend. I made mine with a pair of ear defenders, some fuel hose, and some copper water pipe flattened at one end then drilled/slotted.

You need to be able to hear the engine for yourself to determine what the knock is, you will be surprised at what you can hear. You can pick out the injectors firing, noisey followers, pistons and detonation. You will also hear the start of detonation before the knock sensor, and may pick up some det that you don't hear in the cabin, and the UTEC doesn't pick up at all.

Paul
can you explain how to make one, please.
thanks
sav
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Old 05-15-2003, 05:21 AM   #9
Pavlo
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Default

I will post some pics.

Paul
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