Error in my tune-$100 to find it for someone

[LS1_Dragster]

OK, I guess neither on of us is getting the point across!!

Any ways, here's 2 screen shots of his setup,

The first one is a run, you can clearly see the timing is fixed at 27 and you can also see the MAP is not moving around enough to mess with the timing or the VE map. The MAP does bounce around some but of course it's because the RPM's are crazy.

The second shows the timing map, clearly the timing isn't going to move anywhere at WOT but 27 degrees.

I'm not sure why your thinking the MAP is messing up the timing and/or the VE map based on the information before us? The location of the vacuum signal plays no part here. It may play a part in part throttle driving but that's not the issue.

[98 tigershark]

Look at the MAP C3003. That show that if the TPS/RPM thinks he should have 105 map. Not enough voltage with the sensor for the correct reading if it is not in the right place. It does matter! When you say WOT are you talking about PE based on RPM? Or B0105. Either way my own MAP from my logs are almost at 105 at 5300 rpms and the timing is right on, but I am using the stock L76 manifold. Do you know were the MAP sensor is located on the Carb style manifold? GMPP says it needs to be in the right spot.
98 tigershark

[LS1_Dragster]

The map reads differently at each altitude. Here in SLC, we are at 4400' or 7000' corrected. The very most we will EVER see on the MAP is 87. Take the same car to Boise and we see 90. I WILL NEVER EVER SEE 105, does this mean that my MAP sensor is bad or it's located in the wrong place? No, not at all.

Go take your car and turn the key on without starting it, this will read the MOST you will ever see at WOT because this represent 0 vacuum. Most cars will always see some vacuum at WOT so your reading will almost always read less at WOT.

Now have your buddy in a different state do the same thing, his MAP reading will reflect his altitude.

So, there is nothing wrong with his vacuum source or his map sensor!

BTW, C3003 is there to catch a bad map sensor, if you exceed or are below it will trip a DTC.

[98 tigershark]

Hey LS1_Dragster,

I really like SL City. I Live at 3800 and see 102-105 Map allot on my own car. I am confused, Is this your car or a fiend that lives by you? Anyway were is his vacuum sensor located on the manifold? please be patient with me.

98 tigershark

The map reads differently at each altitude. Here in SLC, we are at 4400' or 7000' corrected. The very most we will EVER see on the MAP is 87. Take the same car to Boise and we see 90. I WILL NEVER EVER SEE 105, does this mean that my MAP sensor is bad or it's located in the wrong place? No, not at all.

Go take your car and turn the key on without starting it, this will read the MOST you will ever see at WOT because this represent 0 vacuum. Most cars will always see some vacuum at WOT so your reading will almost always read less at WOT.

Now have your buddy in a different state do the same thing, his MAP reading will reflect his altitude.

So, there is nothing wrong with his vacuum source or his map sensor!

[LS1_Dragster]

All cars that have MAP sensors fall under this rule. If you are seeing 105 then you have something wrong!!! Go out and turn your key on without starting it and let me know what the numbers are.

These are my cars. I've done 7 in all and it jsut doesnt matter to an extent where the vacuum source is.

Look at the attached article, maybe it will explain it better then me:

[SSpdDmon]

Hey LS1_Dragster,

I really like SL City. I Live at 3800 and see 102-105 Map a lot on my own car. I am confused, Is this your car or a fiend that lives by you? Anyway were is his vacuum sensor located on the manifold? please be patient with me.

98 tigershark

This is not normal for NA cars. Do you have a vacuum leak by your sensor? It's also odd because mine pegs at 103kPa when I hit boost.

[98 tigershark]

Attached are reports that show my MAP at 100%TP
I do have a few logs at sea level at 102 map at the track actually 900ft.
98 tigershark

[LS1_Dragster]

I dont what these logs are, dont you have any logged data?

BTW, both show max MAP value at 95.

[98 tigershark]

The reports show the map were I live. But here is the deal. Were is the MAP sensor located on the manifold on #8 rail? If you know more than GMPP I am willing to listen. That was the subject, right! As to what I posted (a report from EFILIve) it shows the MAP!!!
98 tigershark

I dont what these logs are, dont you have any logged data?

BTW, both show max MAP value at 95.

[LS1_Dragster]

I think I'm in the twilight zone.........

What on earth are you trying to get across? I'm so completely lost as to what the heck your point is.

First picture 15 min 52.5 avg 95 max
Second picture 24 min 52.1 avg 95 max

So where is the 102 to 105 your talking about?

Also, AGAIN, with a 3/8 NPT hole in #8 on a CARBURETED manifold it's a BRAKE BOOSTER port!!!! When was the last time you ever saw a MAP sensor with a 3/8 NPT fitting?

BTW, did you even look at your posted logs? Are you sure these where what you wanted to upload?

Basically, I'm done with this weird conversation, lets get back on what the original posters problem is.