negative advance question

[Seb Cyclefer]

I have HP Tuner for my 1997 Firebird M5 and when I look to the timing advance in the VCM Scanner, it only have negative numbers...

I have numbers from -10 to -43. I always have an average of -15 when I floor it from 35 tps to 80 tps.

I want to know if those numbers are good ? May I have a bad O2 sensor or something else that can cause bad reading of timing advance ?

Thanks

[silvachris1]

Re: negative advance question

That's retarded.

[Seb Cyclefer]

Re: negative advance question

That's retarded.

I know that the timing is retarded. I want to know if it's normal to have sometime -40 of timing advance and an average of -15 ?

I bought my HP Tuner in early winter so I didn't log any data at the track but I expect my car to have as much power than this summer and my last track time was 15.5 @ 94 mph.

My mechanic said that the timing advance numbers aren't good because my car would run very slow with those numbers.

[Seb Cyclefer]

Re: negative advance question

Just to mention, the timing chain was replaced at 137500 miles. The car currently has 162500 miles, so the timing is supposed to be ok.

I just want to know if my mechanic is right when he say that the numbers cannot be as much negative as -30 or -40 ? That if the numbers are right, the engine would run very bad ? This is not the case right now because the car is running very well.

[97rs4life]

Re: negative timing advance question

here is a snap shot of my table for an NA run I made a year ago. Should help ya out. ;)

[ssms5411]

Re: negative timing advance question

The negative #'s are suppose to be positive #, just an error in hptuners. So never mind the - in front of the #. Also you look at your timing under Wot like 97rs4life image above. Then you can select max or min to get your advance, remember since the #'s are reading neg. the min setting will tell you your max timing.

[iGoRa]

Re: negative timing advance question

What are you guys talking about? I never had negative advance
Heres Minimum values
NA :

[slow6]

Re: negative timing advance question

I've Never had negative advance either (in a scan Log)
But in my timing tables, yes there are cells that have neg advance.

Maybe its just a bug for older cars?

[caspernicus]

Re: negative timing advance question

I've Never had negative advance either (in a scan Log)
But in my timing tables, yes there are cells that have neg advance.

same here

[97rs4life]

Re: negative timing advance question

that is what my 97 shows in the histos

[iGoRa]

Re: negative timing advance question

Hpt 2.1?

[slow6]

Re: negative timing advance question

Yes go to hpt's customer center and make sure you have the latest version 2.1.16

Gora's is a 1998 (that was tough to find)
What are you caspernicus?

Seems like this is a 1997 only problem

[ssms5411]

Re: negative timing advance question

I pretty sure it is only a 1997 problem , mines been reading - advance since I bought it about 4 years ago, I thought there is a fix for it changing something in the pid's but I never tried. I don't mind the negatives readings anymore, I'm use to them now. As long as you know there not really negative.

[iGoRa]

Re: negative timing advance question

That explains alot, I was reading vipers log and its all minuses, I looked at mine , and it looked like I would have to pull 30* out before boosting the vehicle.

Gora's is a 1998 (that was tough to find)

Fixed :)

[ssms5411]

Re: negative timing advance question

I know along time ago I ask Hptuners if they could fix the error and they said the would have to redue the whole programming and it wouldn't be worth the time and efffort just to fix this one problem, so I think they came out where you can change something in the PId to correct it. As long as I can tune and still read the scanner I don't care about the - in front of the #.