tune help, files attached

[BAD_LS1]

If anyone has the time, could they look at my log file and my tune and give any pointers. My 1/4 mile times don't seem too right and I feel I should be 60' alot harder than it is (1.62). This is my second to last pass of the day. I didn't get the last pass logged after I adjusted some of the timing as I was getting some KR.

Car is a '98 TransAm, stock '98 PCM running speed density, 346 c.i., built 4l80e auto w/ FTI 4400 convertor, MWC 9” w/ 4.11 gears, 28” MT drag radials, MS3 cam (234/242 dur @ .050, .603/.609 lift, 113 lsa), PRC stage 1 243 cylinder heads w/ Patriot Performance gold spring kit, SLP underdrive pulley, LS6 intake, TR7 spark plugs and MSD 8.5 wires, Pacesetter 1 3/4” long tube headers and TSP off road y-pipe to a Magnaflow catback, 3” DMH cutout, 42# green top injectors

Best time before the new 4l80e trans was 11.45 @ 119 mph. On this log, I think it went an 11.71 @ 117 mph and 1.65 60'. DA probably wasn't that good but I feel this car should still run better. Car is probably a 100 lbs lighter than stock. Full suspension minus tubular k-member and a arms. Weld alumastars in the front and rear. Getting no wheel spin.

What do you think? Probably needs new driver mod???

[Google]

Best time before the new 4l80e trans was 11.45 @ 119 mph. On this log, I think it went an 11.71 @ 117 mph and 1.65 60'. DA probably wasn't that good but I feel this car should still run better. Car is probably a 100 lbs lighter than stock. Full suspension minus tubular k-member and a arms. Weld alumastars in the front and rear. Getting no wheel spin.

The 4L60E and the 4L80E don't have the same gearing and the 80 wieghs about 70lbs more the the 60. the 80 1st gear is like going from 4.10's to 2.73's. so you need more power to get the same times as you do with the 60.

[orange ss]

what kind of compression are you running ? Are you using N2O ?

[69lt1bird]

Why TR7 plugs?
The VE tables need a lot of work, seems off.
Injector data is not correct for the green tops.

[BAD_LS1]

what kind of compression are you running ? Are you using N2O ?

whatever stock is but a little bit more for the 243 unmilled heads. I plan on spraying a wet shot at it but haven't yet. When that time comes, I'll bump the timing down for those runs. That's the reason I'm running the colder TR7's.

[BAD_LS1]

Why TR7 plugs?
The VE tables need a lot of work, seems off.
Injector data is not correct for the green tops.

TR7's for the nitrous runs I plan on (150 wet shot). I'll have to look into the injector data as I pulled it off one of the sites...

[BAD_LS1]

just found out that the ford 42#'s are rated at 41.47 @40 psi. so I'll fix the flow rate...

[Frost]

the car is dead nuts lean in flash in first gear in the log. It's ok up top, but at near 14:1 where load is the greatest ('sitting on the stall'). Fixing that will help for sure in the 60'. Having the injector data so far off means that estimated cylinder fill is near HALF of what it should be. You are landing wayyy too high on the timing map because of this and getting like 30deg of timing while at 14:1 in first gear (at WOT). With the long first gear in the 80; that's kinda rough on things.

[beamar]

The 4L60E and the 4L80E don't have the same gearing and the 80 wieghs about 70lbs more the the 60. the 80 1st gear is like going from 4.10's to 2.73's. so you need more power to get the same times as you do with the 60.

the 80 only weights about 15 to 20# more...

4l60e gearing:
1 2 3 4 R
3.06 1.63 1.00 0.70 2.29

4l80e gearing:
1 2 3 4 R
2.48 1.48 1.00 0.75 2.07

[Google]

the 80 only weights about 15 to 20# more...

4l60e gearing:
1 2 3 4 R
3.06 1.63 1.00 0.70 2.29

4l80e gearing:
1 2 3 4 R
2.48 1.48 1.00 0.75 2.07

not trying to argue, I have both and it's alot more then 20lbs. plus the converter is alot more as well.

[beamar]

not trying to argue, I have both and it's alot more then 20lbs. plus the converter is alot more as well.

I hear you. I am just tired of seeing everyone post that they weight 100#'s more. They don't. I have a 4l80e in my T/A and it's not that much more. Yes the converter weights more stock vs stock. Otherwise, an aftermarket converter is about the same.

[BAD_LS1]

the car is dead nuts lean in flash in first gear in the log. It's ok up top, but at near 14:1 where load is the greatest ('sitting on the stall'). Fixing that will help for sure in the 60'. Having the injector data so far off means that estimated cylinder fill is near HALF of what it should be. You are landing wayyy too high on the timing map because of this and getting like 30deg of timing while at 14:1 in first gear (at WOT). With the long first gear in the 80; that's kinda rough on things.

thanx for the useful info!! I know that the injector flow rate was off but do you think it had that huge of an effect on everything? It was only off a point here and there. I know it all adds up and that a culmination of little things will really make a huge effect. Just wonderin'.

[69lt1bird]

Voltage and minimum pulse width is also not right. That will throw everything else off.

[BAD_LS1]

Voltage and minimum pulse width is also not right. That will throw everything else off.

Could you give me the correct figures for this? I left that stuff at the stock settings. Any help is appreciated, thanks!

[69lt1bird]

Sorry man, can't post them on here someone will probably sue me.