Bypassing knock sensor

[crunchymilk55]

Get a logger. Less than 100 bucks.

[Thor06]

Shit, but Mike's. Check his ad, I think hes had that bastard for sale since before I spun a bearing.

[gthompson97]

I understand that you think it's knock because of how it runs, shitty mileage, the guy told you it was, etc, but you really have no real signs that point to knock. Bad turbo maybe? I don't know man.

[AbsoluteGTR]

Originally Posted by crunchymilk55

Get a logger. Less than 100 bucks.

The logger is a 100 bucks. But what about the software and all the other stf that goes along with it.

Anyways I have a laptop, cant I just use that?

EDIT> As for the bad turbo part, I doubt it. The turbo has absolutely ZERO shaft play and spins freely and everything.

[MT-2500]

Originally Posted by AbsoluteGTR

Where else would the problem lie? My idle is fine. Kinda low around 600-700.

The is no popping or backfiring at all. Done a boost leak test. Only leaks are at the throttle body shaft seals. I KNOW that can NOT be the cause of the problem.

For daily driving, the car is fine. But if you needed to get on the car, it will not get up and go. The car doesnt pull hard at all.

At 3K RPM I can feel the turbo kick in, but it just doesnt push me back in my
seat.






I read on tuners that if the knock sensor is NOT plugged in the ECU will automatically pull the timing. Even if the car is not knocking, the ECU will automatically pull the timing and make the mixture extremely RICH just to be safe.

Come to think of it, my gas mileage is absolutely HORRIBLE.

It seems as though everything I think of points to knock!

Check the tune up end and run a backpressure test on exhaust system.
Good Luck

[AbsoluteGTR]

Well I am running just a downpipe so I bet I have no backpressure, lol. Just to put it out there, my exhaust rattle...cant that make the knock sensor give off a false rading?

[gthompson97]

Originally Posted by MT-2500

Check the tune up end and run a backpressure test on exhaust system.

What in the hell good would that serve?

Originally Posted by AbsoluteGTR

Well I am running just a downpipe so I bet I have no backpressure, lol. Just to put it out there, my exhaust rattle...cant that make the knock sensor give off a false rading?

It might if it's banging around loud enough? Any why are you running just a downpipe? It shouldn't be a problem being as turbo cars don't rely on as much exhaust velocity (also known as the incorrect term of "backpressure"), as NA cars do. Backpressure is bad in any car, it fights exhaust velocity, therefore slowing down exhaust flow and causing a loss in power (and overall efficiency).

[AbsoluteGTR]

Originally Posted by gthompson97

It might if it's banging around loud enough? Any why are you running just a downpipe? It shouldn't be a problem being as turbo cars don't rely on much exhaust velocity (also known as the incorrect term of "backpressure").

I know, lol. I read all of kjewers post on that!

I wish I wasnt runnin just a downpipe (it really coming off where the center console is) but the previous idiot cut it off....

Any more suggestions?

[MT-2500]

Originally Posted by gthompson97

What in the hell good would that serve?



It might if it's banging around loud enough? Any why are you running just a downpipe? It shouldn't be a problem being as turbo cars don't rely on much exhaust velocity (also known as the incorrect term of "backpressure").

Quote:
Originally Posted by MT-2500
Check the tune up end and run a backpressure test on exhaust system.

What in the hell good would that serve?


Well I am from the old school.
If it is not running good they always told me to tune it up.
Works for me.

[AbsoluteGTR]

Originally Posted by gthompson97

It shouldn't be a problem being as turbo cars don't rely on much exhaust velocity (also known as the incorrect term of "backpressure").

The way I understood it when I read kjewer's post was that infact that turbo cars DO rely on exhaust velocity and NOT exhaust backpressure. Its just that people assume backpressure and velocity and the same!

[gthompson97]

Whoa typo! That is NOT what I meant to say. You are correct. Backpressure in ANY car is bad, it's what slows down exhaust velocity. Exhaust velocity is good in any car, but more in NA than turbo cars. That's what I meant to say, it's not AS important in turbo cars as NA because the NA relies solely on the complete flow through the whole system, it doesn't have the turbo to help with intake. NA's need ALL the flow they can get through the whole cycle to run efficiently and have any power what so ever.

I edited my post just so I don't confuse the shit out of anyone.

[AbsoluteGTR]

Originally Posted by gthompson97

I edited my post just so I don't confuse the shit out of anyone.

Great, now people are gonna think I'm on crack, since I quoted you on somethig you never really said....

Anyways, I am gonna check out the talon tomorrow and see if there is any blackish color goo on the back of the knock sensor (which idicates it is bad and has melted). Im gonna make sure that the guy who rebuilt the engine didnt torque the hell out of it, because then it will pick up anything that knocks/rattles and it will tell the ECU that the car is knocking when in fact it really could not be... (In other words by overtightning it you make it too sensetive)

The correct torque value of the knock sensor is 17 ft/lbs...just for future searchers! Just hand tighten it and then a slight turn with a 24mm wrench

I just hope that this is my problem, lol.....

[crunchymilk55]

the turbo is the source of all the backpressure that is needed.