Got a dyno tune. Does this look strange?

[ForcefeedWS6]

Looked through my tune after having it dyno tuned. Some of the stuff he did looks strange. Take a look at the VE and Spark tables and how they are set up. The injector flow rate table is strange also. Take a look and see what you guys think. He used HP Tuners to tune it.



[attach]11872
[ATTACH=CONFIG]11873

[Chalky]

Any chance you have a copy of base tune you can attach?

[ForcefeedWS6]

I added my stock tune.

[Chalky]

Just a quick look and I am just layman but it looks like a pretty through tune. VE table seems reasonable. Your tuner even tweaked your MAF table which is not all that common.. I can only guess but he may have used the IFR tables to achieve a desired AFR. This is not uncommon.
High timing table and low timing table are identical. I always felt it was better to have the low octane table carry lower timing value than the high octane table just in case you come across a bad batch of fuel or knock. Looks like he pulled some timing and added. Also see a slight reduction in timing in max tq area 4400-4800 rpm. Again pretty normal.

How was AFR based on dyno tune?

Overall, I see a lot of work put into your tune.

I am sure others will offer opinions as well.

[minytrker]

What mods do you have? Did a quick look and I agree, looks like someone spent some time on it, didn't see alot of hacks and shortcuts I see alot of times.

[joecar]

Looks thorough, Main VE and Back VE seem to match.

LTFT trimming is disabled, this is intentional if you intend to run OL.

Also, there is one parameter that is out of range (according to EFILive build 180 tunetool):


Out of Range calibration summary: 08:29:26 am, Thursday Sep 08, 2011

Engine Calibration.Fuel.Trim
{B3802} Minimum Coolant Temp to enable LTFT, was out of range when loaded.

That can be fixed by setting the temp to 283F (if you intend to run OL).

Also, IFR table being flat indicates you have a manifold referenced FPR (located at fuel rail, and has return line), is this what you have...?

As Chalky said above, I like LO spark to be a little lower than HO spark table. Also, I like PE table to be a little richer, but it's ok where it is as long as you don't get knock.

Overall tune looks good.

[ForcefeedWS6]

The IFR table confused me since they were flat all the way across and not going up. I do not have a vac ref reg on the rail. Running in OL is what he set up, I didn't ask him to do that. I don't know what the afr was when tuning. My dyno sheet didn't say and he didn't say. When he tuned it he said it seemed like somethinmg was choking it. It made 405hp, he thought it would have been a little more around 420hp. I read about the flowmaster 80 series having alot of restriction. I pulled it off and man did it wake it up. It leaned it out, my STFT's are adding 40-45% at idle. I need to drive it and log data and see what kind of knock retard I have. I've tried rescaling my injectors and got my STFT's down to +/-4% at idle. However it is rich as hell when it first starts. STFT shows -20 to -25% for a few minutes then it works down. If I try to do a warm restart it loads up and dies. Thanks for the info joecar on clearing up the error in the tune.




My mods are 230/230 598/612 111+2, 243 heads milled to 62cc,36lb injectors,racetronix fuel pump,ls6 intake,lid,pacesetter longtubes, tsp catted y pipe, slp lm1 and motive 3.90 gears.

[joecar]

If you have no vacuum reference on the FPR then the IFR has to be sloped (the slope is actually the squareroot of pressure ratio)...

get your tuner to use the spreadsheet to calculate the sloped IFR for your injectors... he will then need to revisit the VE and MAF tables.

[ForcefeedWS6]

Unfortunatley i got my tune almost a year ago. It ran fine, it just leaned out after I removed the flowmaster. They want me to pay for another one. Was hoping to get my fuel trims close and check for knock retard. When I scaled my injectors it was realy rich on a cold start and a warm restart.

[joecar]

If you rescale the IFR then you have to rescale the VE and MAF tables.

[ForcefeedWS6]

Well I took the car out and logged some data to see what kind of knock retard I had. I made some pretty hard pulls and it only pulled 3.9 degrees. That seems pretty good to me. The tuner must have set it up lean at an idle.

[etmotorsports]

What were you dyno numbers?

I don't see any reductions in the knock tables i assume you have aftermarket cam and headers that could be false knock if you have dyno data post it up.

[ForcefeedWS6]

Here is my dyno sheet. What knock tables are you refering to? Do you recommend I leave the timing alone or pull a little out where it showed some retard? Yes, I'm running an aftermarket cam and headers. Thanks.









[attach]11896

[swingtan]

I'd set the low octane table so it was lower than the high octane table for starters.

Do you have any logs you can post?

[ForcefeedWS6]

Here is the log I ran last night. It's long. How much should I drop the low octane table?



[ATTACH]11903

[swingtan]

I usually drop 4' around idle and 8' everywhere else. Others have different ideas but that's what I usually do.

[ForcefeedWS6]

When the ecm sees knock while in the high octane table does it drop down to the low actane table in that cell or just cut timing in the high table? I will drop my low table down some. Joecar said my PE looked a little lean. Wonder if I should try bumping it up just a little and see if that helps what knock I have?

[joecar]

Your PE ranges from 1.1396 to 1.1504... I would make it 1.17 all across.

[ForcefeedWS6]

Ok, thanks joe. What do you recommend on my low actane timing table?

[Chalky]

From what I have read, when you get KR, the tables are blended until the KR disappears. Once the KR is gone, the timing will migrate back to the high table. I have also read that at some point, and this may be ecm specific, the timing will revert to the low until your next fuel purchase. I believe there is a pid to watch high/low octane tables interact but I cannot be certain.

I looked at your log and your KR didn't seem bad at all. It is normal to a degree when going to and coming off throttle. My stock LS7, with no mods, did the same thing. Headers make matters worse. I have tunes on hand for LS7 where some tuners dial back knock sensor sensitivity to cover false KR or KR in general. It scares me.

I think Joecar has an opinion on this subject as well.

Correct me if I am wrong, but your primary pipes merge into one exhaust pipe correct? Always seemed like a real bottleneck to me on F-Body.

[joecar]

I usually drop 4' around idle and 8' everywhere else. Others have different ideas but that's what I usually do.


Ok, thanks joe. What do you recommend on my low actane timing table?What Simon said is good, and Chalky has valid points.

[joecar]

...

Correct me if I am wrong, but your primary pipes merge into one exhaust pipe correct? Always seemed like a real bottleneck to me on F-Body.Yes, that is why a large diameter aftermarket catback is a good mod.

[ForcefeedWS6]

Your PE ranges from 1.1396 to 1.1504... I would make it 1.17 all across.


Are you referring to B3618 to make these changes?

Thanks again.

[ForcefeedWS6]

I figured it out. I wasn't finding the same numbers you had listed. I changed the decimal point on B3618. Thanks again.

[Sid447]

If I try to do a warm restart it loads up and dies.

You might want to look at the Desired Idle Speeds table {B4603}.
If you are M6 then only the first two columns need to have values (you have all four, like an A4 car) but the values you have differ by quite a margin:-
500rpm In Gear, AC On. & 900rpm In Gear, AC Off.

Copying over the 900rpm column would certainly help with your re-starts.

[ForcefeedWS6]

I don't have my idle set that low. Was playing with it to see what it sounded like idling at 500. My idle is normally set at 800.

[Sid447]

I don't have my idle set that low. Was playing with it to see what it sounded like idling at 500. My idle is normally set at 800.

You posted a tune file here,

For people to help you; that you've purposely adjusted out of whack.......
....Okay I get it.

[ForcefeedWS6]

I didn't notice that I posted the tune that I dropped the idle on. My idle has always been set at 800. I apologize.