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Old 11-27-2006, 09:23 AM   #1
Rexfan
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Default WI and little knock

I am running a Snow Performance stage 2 kit with their boost juice and a proper tune. I'm also running about 1.5 bar or 22psi. I still see my knock lite and utec flash on occasion. I thought WI would kill this for ever? I bought the kit to prevent knock and run a little more boost? Any insight to this? This system is bolted up to a 2.5 hybrid,FP Green,TMIC, and all other supporting mods.
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Old 11-27-2006, 11:40 AM   #2
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this could be phatom knock, aka vibrations in the car, do you have the turboxs tuner pro?
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Old 11-27-2006, 11:43 AM   #3
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H20 or 50/50 mixes do not "kill detonation". They're as good as the tune, just like tuning for 91 vs. 96 octane.

So, tell us what the "proper tune" is set up like as a start.
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Old 11-27-2006, 01:00 PM   #4
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Quote:
Originally Posted by jblaine View Post
H20 or 50/50 mixes do not "kill detonation". They're as good as the tune, just like tuning for 91 vs. 96 octane.

So, tell us what the "proper tune" is set up like as a start.
Called Snow Performance and they recommend checking pump flow. They also want me to check the nozzle size as I may need a larger one?


A proper tune would be done by someone with plenty of experience. Hmm semantic games....I should have said, "I got a tune by someone with plenty of experience in WI installation and tuning within the Subaru community....
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Old 11-27-2006, 01:02 PM   #5
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Quote:
Originally Posted by ULTIMATE CC View Post
this could be phatom knock, aka vibrations in the car, do you have the turboxs tuner pro?
I agree with phantom knock, but it still freaks me out. I do not have a TXS tuner pro.
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Old 11-27-2006, 01:30 PM   #6
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how many count knocks are they...
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Old 11-27-2006, 01:30 PM   #7
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Quote:
Originally Posted by ULTIMATE CC View Post
this could be phatom knock, aka vibrations in the car, do you have the turboxs tuner pro?
pssssst, thats exactly what iv been telling him. However, still a good chance it is true knock. REX says it is happening under load, in low rpms and thats where i get some of my flashing cel, not often thou.

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Called Snow Performance and they recommend checking pump flow. They also want me to check the nozzle size as I may need a larger one?


A proper tune would be done by someone with plenty of experience. Hmm semantic games....I should have said, "I got a tune by someone with plenty of experience in WI installation and tuning within the Subaru community....
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Old 11-27-2006, 01:34 PM   #8
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how many count knocks are they...
Yes, He should do a data log of it happening. Also should borrow an wideban. He also says the egts get pretty darn high, and that im alittle concerned about.
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Old 11-27-2006, 01:35 PM   #9
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if its under load in low rpms it is likely your tune, this is a common area of knock because of the transition from stock ecu to utec and the timing being much more aggressive on the utec...
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Old 11-27-2006, 01:41 PM   #10
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Quote:
Originally Posted by ULTIMATE CC View Post
if its under load in low rpms it is likely your tune, this is a common area of knock because of the transition from stock ecu to utec and the timing being much more aggressive on the utec...
Thank you
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Old 11-27-2006, 02:00 PM   #11
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Quote:
Originally Posted by ULTIMATE CC View Post
if its under load in low rpms it is likely your tune, this is a common area of knock because of the transition from stock ecu to utec and the timing being much more aggressive on the utec...

Thanks for the input. I'm going to have it road tuned a bit more. It probably needs a bit of tweaking. My hopes are to one day have some tuning capabilities of my own.
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Old 11-27-2006, 02:33 PM   #12
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Using water injection with 93 octane(or whatever) is like having higher octane fuel. The engine can still knock, but it should be able to handle more abuse b4 this happens. If a car is tuned with a given safety margin, it doesn't matter how high the octane, the chance of knock is still the same. If the car is tuned less agressively(ie-larger safety margin and less power), the chance of knock is less. With water injection, you should be able to get more power from a less agressive tune then compared to if you were just using the gas you use when injecting water.

Imo, the chance that your tuner is to blame for real knock that's occuring is much higher then you seeing phantom knock. If this is the case, your tuner should fix the problem for free. Either way, your tuner should want to look at the car rather then have some people on here speculate about it. If I were you, I'd give him a call and see what he says.

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Old 11-27-2006, 07:14 PM   #13
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^^^Thanks for the input. I spoke with my tuner and he's more than willing to spend time with me, road tuning. I thought I would do some of my own research to see what could learn.

Cheers,
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Old 12-02-2006, 05:22 PM   #14
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I get this too, which is why I am getting a complete retune. Primarily, I would see 1 count knocks, which are possibly not det, I have only seen one instance of 2 count knock, and nothing more, but that's just what I've logged, which is a small portion of drive time and knock i've seen.
Several gurus have talked about setting the utec to ignore a 1 count knock, because so likely to be phantom knock.

I am also buying a wideband.
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Old 12-02-2006, 06:13 PM   #15
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I ignore anything below a 4 count besides under certain conditions, after tuning for a while you get a feel for what real knock is...
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Old 12-02-2006, 08:11 PM   #16
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I know I said this b4, but if you paid for a tune, you should not have to pay for a complete retune just because you're seeing knock. Once you get a tune, you should not have knock problems, and if you do, the tuner should fix them for free. Changing the utecs knock detection so it only reacts to knock when it sees higher then counts of 1 is not fixing the problem unless someone has listened for knock and determined that all 1 counts are false knock. I've heard pings many times when my utec read counts of 1, and many people have even heard knock without the utec detecting anything......

peace
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Old 12-03-2006, 10:16 PM   #17
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Hippy - you are right, but for me, it's not possible. I have to start over with someone new.

I appreciate that you have been there to comment on lots of utec threads - I am absorbing a lot. I did try your recommendation of that 0% column timing lockdown and it did cure my shift knock. See you around.

As for Rexfan - good luck
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Old 12-04-2006, 08:29 AM   #18
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I'll be seeing my tuner soon for a tweak. Thanks for the insight.

Rexfan
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