Gibbo205
Well-Known Member
- Thread starter
- #1
Hi there
Some will know I've being chasing down a false positive knock, that mainly happens on shifting at WOT or hard acceleration at high RPM.
After going through the car with a fine tooth comb and some aspects reducing the issue I was all at the point of giving up as this thing would still register +5.99 the moment I got back on the gas after shifting.
Its almost as if the car had some kind of pre-emptive or burst knock kicking in. The problem is it would just stay +5.99 keeping timing under 20 degrees, the only way is to lift and go back on power and then it moves back to negative.
If I floor it from a low RPM, I can go 1500rpm 4th gear all the way to 8000rpm and then it sits negative knock 29-32 degrees the whole run.
Prior to swapping TB's I tried:
- Full can of Torco
- AED Base Map
- Lund Base Map
- AED Performance Map
- Lund Race map
- Car thoroughly checked, everything tight, no rattles, exhaust hitting no where, engine mounts all good etc.
Yet both Lund and AED show the same false knock issue, the Lund a touch less so because I believe they marginally reduce knock sensor sensitivity.
It is 100% false knock or BURST knock, adding full can torco, running base maps has no impact.
Now I have re-fitted stock TB, loaded the same Lund tune, only difference being for the throttle bodies, no matter how hard I shift, hard hard I punch the gas it is negative knock all the way!
So could I have a faulty 350 TB? Or do our cars maybe suffer burst knock?
Something I have always noticed on my car with 350TB is its loud, popping sounds in the intake when running and when shutting off, I know others have this too.
When I did my datalogs for Lund/AED all looked superb as for a log they just want a 3rd gear pull from low RPM, this on the 350TB is fine, zero knock. I only get positive knock when shifting at high RPM and going 100% WOT or punching the gas hard 100% beyond 4000rpm causes positive knock.
I only came across the issue because I went back to 350 TB for my AED tune and loved how it drove, Shauns tune drives better than any of the others, its so good it drives nicer than the stock throttle body drives, that is how good it is.
But I felt the car was slower on 1/4 mile run, so when I logged a run it indeed showed this false knock keeping timing sub 20 degrees, at which point my hunt began.
So after all this wasted time to find out the cause all along has being the 350 TB is annoying. :(
The others out there with 350 TB on manuals can you datalog some 1/4 mile runs, see if you see any positive knock.
This could maybe also be the reason why to me the car never drove nice on Lund tune, was always touchy, maybe due to dicky throttle body.
So now I am going to try and find another 350 TB to test, I was just wondering if anyone here ever encountered a TB to cause them such a false knock issue like this?
Some will know I've being chasing down a false positive knock, that mainly happens on shifting at WOT or hard acceleration at high RPM.
After going through the car with a fine tooth comb and some aspects reducing the issue I was all at the point of giving up as this thing would still register +5.99 the moment I got back on the gas after shifting.
Its almost as if the car had some kind of pre-emptive or burst knock kicking in. The problem is it would just stay +5.99 keeping timing under 20 degrees, the only way is to lift and go back on power and then it moves back to negative.
If I floor it from a low RPM, I can go 1500rpm 4th gear all the way to 8000rpm and then it sits negative knock 29-32 degrees the whole run.
Prior to swapping TB's I tried:
- Full can of Torco
- AED Base Map
- Lund Base Map
- AED Performance Map
- Lund Race map
- Car thoroughly checked, everything tight, no rattles, exhaust hitting no where, engine mounts all good etc.
Yet both Lund and AED show the same false knock issue, the Lund a touch less so because I believe they marginally reduce knock sensor sensitivity.
It is 100% false knock or BURST knock, adding full can torco, running base maps has no impact.
Now I have re-fitted stock TB, loaded the same Lund tune, only difference being for the throttle bodies, no matter how hard I shift, hard hard I punch the gas it is negative knock all the way!
So could I have a faulty 350 TB? Or do our cars maybe suffer burst knock?
Something I have always noticed on my car with 350TB is its loud, popping sounds in the intake when running and when shutting off, I know others have this too.
When I did my datalogs for Lund/AED all looked superb as for a log they just want a 3rd gear pull from low RPM, this on the 350TB is fine, zero knock. I only get positive knock when shifting at high RPM and going 100% WOT or punching the gas hard 100% beyond 4000rpm causes positive knock.
I only came across the issue because I went back to 350 TB for my AED tune and loved how it drove, Shauns tune drives better than any of the others, its so good it drives nicer than the stock throttle body drives, that is how good it is.
But I felt the car was slower on 1/4 mile run, so when I logged a run it indeed showed this false knock keeping timing sub 20 degrees, at which point my hunt began.
So after all this wasted time to find out the cause all along has being the 350 TB is annoying. :(
The others out there with 350 TB on manuals can you datalog some 1/4 mile runs, see if you see any positive knock.
This could maybe also be the reason why to me the car never drove nice on Lund tune, was always touchy, maybe due to dicky throttle body.
So now I am going to try and find another 350 TB to test, I was just wondering if anyone here ever encountered a TB to cause them such a false knock issue like this?
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