Well since I had done cams I had a weird squall noise and unexplained knock that got progressively worse. At first with the S1's everything was business as usual, retune, and it ran fast. Fast forward a month or two and I had inexplicable knock that was completely independent of timing or fueling but always seemed to be about 5000rpm or so. My car had lost 6th gear back in early July, and I hadnt really thought about it. Took it in to have English Racing rebuild the tranny and take a look at the clutch and see if it needed replaced. I had figured it would but wasnt too worried about it since my 5 speed wasnt prepped yet.

Pulled the tranny and sure enough the clutch was done. But what do expect from a stock clutch with 175 6300rpm launches and numerous low 12, 11 second passes. The springs were shot in the clutch plate and were rattling and the flywheel had a few burn marks. In goes an Exedy HD twin and guess what...NO KNOCK. Now I get to retune and add timing back in and make sure I am where the car should be again. Anyone with odd unexplained knock may want to consider this as a possibility for why they cant tune it out. Or why it is really intermittent.

JB

 

Wow that is interesting. What sort of knock sums were you seeing? So do you think the knock had to do with the slipping and catching of the clutch causing varying load on the motor or residual noise from the clutch chatter?

 

Interesting, I guess it goes back to what some folks have been saying about the 03-04 p0300 problems being caused by noise from the tranny. Your results certainly seem to lend credit to those claims.

We've been working on tuning a GT35r sti the past couple months. He had an issue where the ecu would pull 6 degrees of timing every run at exactly 5800 rpm, would not respond to fuel or timing changes, no matter what it would pull 6 degrees at 5800. The owner did some digging around and found out that the knock sensor has to be installed in a very specific orientation, his was not in the proper orientation, he corrected it and has been logging it and it seems the 6 degree drop is gone. He is comming back in on saturday for another tune.

The shop owner and myself were both skeptical about this because it is just a plane old bosch knock sensor, but I suppose if Subaru set up the knock filters with the sensor is a specific orientation.........

I wounder if the evo could be the same way... I'll have to do some more digging I suppose.

 

..

 

^^^

One more reason to start saving for a shep tranny, did the transfer case last year, I guess I'll start saving now

 

I think it was the springs in the stock clutch. I didnt have high knock counts, but it was a tuning nightmare trying to make it go away. I knew it was phantom when it would knock at 22psi and stock timing with 11.5:1 AFR's. I disabled the knock sensor and retuned and the car pulled fine. I would get counts between 5-15 counts usually at 5200-6000 rpm. I could let off and hammer the throttle and it would be fine. Today I went for a drive with the MBC set at 25psi on pump and positive timing numbers at peak boost and NO KNOCK AT ALL. I had a smile that would make an alligator jealous.

I think some of it was how worn the plate was, the pressure plate, and I believe Lucas said the TOB was smoked as well. If he sees this thread he can comment on that. All I know is that I definitely dont have the knock like I did and this is the only change that has been made to the car. I cant wait to put the meth on it and run 30

 

The disc was smoked for sure. The TB was fine. I was just telling you I put 5 wave springs on the TB to help with the popping apart of the TB.

Glad everything is working out good.

 

Sounds like what my car does. It is almost impossible to get rid of knock 5000-6500rpm. New clutch is going in soon.

 

Can you guys help me with a similar problem? I just put in a new clutch and now I am getting knock. I have all the bolt ons, a 20g, 780cc inj., and methanol. I am getting it at different RPMS, but nothing really consistant. Here are some logs. I didn't log AFR because I have the LC1 and its a ***** and I just did these logs real quick. AFR are between 12.0 @ 3k and 11.0 @ redline.

I was going to post my current map, but it is too large. If someone can help me or needs to see it to know if this knock is false I can email it to you.

Thanks

 

how did you guys disable the knock sensor ? by way of running an Aftermarket ECU ?

 

KY-Thats looks like real knock to me. When ever I have phantom knock or false knock the counts go from 6 to 0. Yours slowly counts down to 0 counts.

 

car felt great with the twin dick in it, cant wait to go for another ride once the timing is back where it should be

 

 

LOL

 

dp ftw(l)