Zero compression in number 7

[BruceH]

Most...if you are supercharged. Not sure about the turbo guys though.



I know for a fact, having both coils on the bench that they are not the same coils externally. The older coils have a slightly larger diameter where the spring is inserted. Plus, the spring on the older plugs is shorter than the newer plugs. Obviously, the boot is also different in length.

Internally (electronically) the coils most likely are the same.



How can your knock sensors be on for part throttle and then off for WOT?
Aren't they on or off...?

This is news to me. I doubt that most tuners turn them off with the s197. There just isn't a reason to do it. If a particular combination is showing false knock then the ks function can be modified in the tune. It can be shut off completely but it can also be adjusted via a table for problem areas.

As you know I'm one of those guys who keeps the fail safe protection on unless it just can't be used. I can't think of one fail safe I've had to turn off.

I'll post a screen shot of the ks tables in a little bit.

Edit: This will give you an idea of what's available for the ks.

Honestly at this point I think it was the gas too. But this didnt happen all at once it was over a couple is weeks. My thought originally was that the proper spark needed more fuel and I didn't know it. I had just swapped the exhaust for emissions within the last month too and I thought I just had an exhaust leak at first. It wasn't until I saw some blue smoke that I realized I had other problems.
In theory I could have hurt it a little each time I got on it trying to figure out the exhaust leak.

What did you swap out exhaust wise?

 

[MachRan]

The stock exhaust and the tune with the 02s on were added for emissions. Once it passed I put the full 3" off road and tune back the way it was. About a week later I added the coils and then it got ugly. That granatelli exhaust is a pain. I thought I had a leak but it was probably already hurt.

 

[Pentalab]

Jimbo, you have to turn off the knock sensors on modified engines!!
Justin turned my knock sensors off when I ran the M90 setup.

You have to turn them off because of the blower, the blower creates too much noise (vibration) that triggers the sensors needlessly.

It gets worse with a built motor.

Knock sensors only work in NA motors.

Not to freak you out, but your knock sensors are probably off too.

The KS are on alright. VMP doesn't shut em off with the coyote engs + TVS-2300 blower's either.

...also earlier when talking about being on/off - I was just saying that maybe the ECU would ignore the knock sensor information at WOT and use it at part throttle, but based on my recent memory from tuning with Justin (other thread,) I believe they are always on.

Lito will probably come across these discussions when he's done catching up from the weekend.

When cruising, it's in closed loop..and afr is c 14.7 Floor it and you are now in open loop..and afr is c 11.7-11.9 They might be able to alter KS activity based on whether it's CL or OL. Or as Bruce pointed out, if false KS activity occurs, the KS can be tweaked to eliminate or ignore false ks.

On a side note, my understanding on the whipple kits is they do not re-locate the IAT sensor to the intake manifold.... fubar imo. Most folks will relocate the iat sensor to the manifold. Dunno what whipple was thinking. The difference in air temps in the intake vs manifold can be huge.

 

[AutoXRacer]

The KS are on alright. VMP doesn't shut em off with the coyote engs + TVS-2300 blower's either.

You sure, Justin turned mine off when he was my tuner; I had the M90 back then.

But OK...
I know mine are off currently.

 

[Pentalab]

I asked him NOT to turn off the KS. (I read him the riot act on this). So I assume he complied. I have never heard it knock ever, but all I stuff into it is 94 octane. It's a conservative tune. With oem 73mm pulley, 6 psi boost, oem crank pulley, it's probably not an issue.

 

[BruceH]

The KS are on alright. VMP doesn't shut em off with the coyote engs + TVS-2300 blower's either.



When cruising, it's in closed loop..and afr is c 14.7 Floor it and you are now in open loop..and afr is c 11.7-11.9 They might be able to alter KS activity based on whether it's CL or OL. Or as Bruce pointed out, if false KS activity occurs, the KS can be tweaked to eliminate or ignore false ks.

On a side note, my understanding on the whipple kits is they do not re-locate the IAT sensor to the intake manifold.... fubar imo. Most folks will relocate the iat sensor to the manifold. Dunno what whipple was thinking. The difference in air temps in the intake vs manifold can be huge.

Not so much with the Whipple. The intercooler is efficient enough that the stock combination combined with the FRPP tune isn't going to have any issues. It's a proven system.

With that said it is a good idea to relocate imo. Whatever they use (there are quite a few ways to add or subtract spark advance besides iat) works pretty good. It's hard to argue with their success rate. I've said this enough times that I'm sure it sickens some to read it but I'll type it out again. When I had a Whipple with a 4.6 3v cruising iats were usually 10 over ambient. Urban stop and go would get higher but the motor isn't getting pushed at that time. Even then it never hit 150. At the end of a quarter mile the highest iat I ever saw was 114. This was on an 80 degree afternoon. The iat was relocated to a rear runner which is about as hot as it gets.