Help trying to figure out an issue with my car

[2k05gt]

Strange thing, today I ran 5 runs at MIR Test and Tune.
I did not reflash the tune I was runnig the tune since Nov 2008 (the last time I raced) so I exspected the car not to run great until I re-flashed the tune. The Car Falls Flat on it's face in 4th gear it feels like it's running out of gas.
I just don't understand the MPH either 105.93 on all three runs, I think a malfunction with the speed gun.....Because the last 2 runs were identical except the MPH. I also PROVED that the PS Delete Belt does nothing at all.

First Run Old Tune Adaptive learning full of crap - (69.8 Deg 30.18 49% Hum DA 671 Ft) (the car bogged of the line)
60' - 1.893
330 - 5.352
1/8 - 8.208
mph - 85.97
1000- 10.696
1/4 - 12.803
MPH - 107.12

Re-flashed tune and installed a PS Delete Belt. (71.8 Deg 30.17 46% Hum DA 797 Ft)
60' - 1.766
330 - 5.139
1/8 - 7.955
mph - 86.91
1000- 7.955 ????
1/4 - 12.510
MPH - 105.93 (Same as the ones below)

PS Delete. (69.8 Deg 30.16 46% Hum DA 693 Ft)
60' - 1.814
330 - 5.209
1/8 - 8.032
mph - 86.79
1000- 10.499
1/4 - 12.591
MPH - 105.93 (same as before)

PS Delete. (71.6 Deg 30.14 46% Hum DA 831 Ft)
60' - 1.777
330 - 5.142
1/8 - 7.955
mph - 87.10
1000- 10.415
1/4 - 12.503
MPH - 108.00

Put the PS Belt to normal (71.6 Deg 30.12 46% Hum DA 854 Ft)
60' - 1.777
330 - 5.146
1/8 - 7.957
mph - 87.07
1000- 10.418
1/4 - 12.506
MPH - 105.93 (Same as the others)

 

[GI Joe]

well the numbers look as if the lights are broken, but if it actually feels like the mcar is laying down, I 'd check the plugs to make sure they are ok, make sure the car is not going fat on the big end ( check A/F) and that will cover the third point which is the fuel pump ( making sure its not going lean)...That will also show on the plugs. Check the plugs.

 

[terry5357]

Strange thing, today I ran 5 runs at MIR Test and Tune.
I did not reflash the tune I was runnig the tune since Nov 2008 (the last time I raced) so I exspected the car not to run great until I re-flashed the tune. The Car Falls Flat on it's face in 4th gear it feels like it's running out of gas.
I just don't understand the MPH either 105.93 on all three runs, I think a malfunction with the speed gun.....Because the last 2 runs were identical except the MPH. I also PROVED that the PS Delete Belt does nothing at all.

First Run Old Tune Adaptive learning full of crap - (69.8 Deg 30.18 49% Hum DA 671 Ft) (the car bogged of the line)
60' - 1.893
330 - 5.352
1/8 - 8.208
mph - 85.97
1000- 10.696
1/4 - 12.803
MPH - 107.12

Re-flashed tune and installed a PS Delete Belt. (71.8 Deg 30.17 46% Hum DA 797 Ft)
60' - 1.766
330 - 5.139
1/8 - 7.955
mph - 86.91
1000- 7.955 ????
1/4 - 12.510
MPH - 105.93 (Same as the ones below)

PS Delete. (69.8 Deg 30.16 46% Hum DA 693 Ft)
60' - 1.814
330 - 5.209
1/8 - 8.032
mph - 86.79
1000- 10.499
1/4 - 12.591
MPH - 105.93 (same as before)

PS Delete. (71.6 Deg 30.14 46% Hum DA 831 Ft)
60' - 1.777
330 - 5.142
1/8 - 7.955
mph - 87.10
1000- 10.415
1/4 - 12.503
MPH - 108.00

Put the PS Belt to normal (71.6 Deg 30.12 46% Hum DA 854 Ft)
60' - 1.777
330 - 5.146
1/8 - 7.957
mph - 87.07
1000- 10.418
1/4 - 12.506
MPH - 105.93 (Same as the others)

Odd that you would say the p/s delete does nothing. It made a .3 tenths difference in the 1/8 mile and a full half second in the quarter. The on difference between your car and mine that really stands out is the torque converter.

I have a friend that has a stick and he said he didn't notice any change either. Strange, very strange.
Also there are several other board members who have reported success with the p/s delete

 

[Rygen]

Scott, when was the last time you replaced your fuel filter. I talked to two guys in the staging lanes yesterday, thier mph was down by a handful as well as their ETs. Seems everyone was struggling. I cut a 1.67 60ft and that usually yields me a 11.7 launching off foot brake at no boost, have to wonder if their timing equipment was having issues.

 

[2k05gt]

Scott, when was the last time you replaced your fuel filter. I talked to two guys in the staging lanes yesterday, thier mph was down by a handful as well as their ETs. Seems everyone was struggling. I cut a 1.67 60ft and that usually yields me a 11.7 launching off foot brake at no boost, have to wonder if their timing equipment was having issues.

I just changed the Fuel Filter Friday night, I also changed the Oil.
I am trying to get some Ideas on whats up with the car loosing power in 4th. I tried to talk t doug about it, I thought that I had to hve him change my tune to reflect the new Stall, He said no tuning for the converter.

I am watching John (boss281) to see how his fuel trim issue works out.

 

[qwikhuh]

Looks like the MPH clocks had issues which is typical for early season racing. I still don't think the PS delete is worth a heck of a lot either, there is no way by itself it is worth 1/2 second. If someone saw that much of a gain there were many other variables in play. MAYBE half a tenth for just deleting the PS. Considering the weather and your slower 60 foot times I don't think your ET is that far off. YOur 60 is off close to a tenth and your best time of the day is off by about .2 tenths. I am not seeing anything really crazy there, especially give that DA absolutely SUCKS for MIR. You average right around 12.30 and ran 12.50 at 800+ feet. That is right in line.

 

[terry5357]

Looks like the MPH clocks had issues which is typical for early season racing. I still don't think the PS delete is worth a heck of a lot either, there is no way by itself it is worth 1/2 second. If someone saw that much of a gain there were many other variables in play. MAYBE half a tenth for just deleting the PS. Considering the weather and your slower 60 foot times I don't think your ET is that far off. YOur 60 is off close to a tenth and your best time of the day is off by about .2 tenths. I am not seeing anything really crazy there, especially give that DA absolutely SUCKS for MIR. You average right around 12.30 and ran 12.50 at 800+ feet. That is right in line.

Well not going to get on the soap box about the p/s bypass, but I was running 13.30's in the 1/4 bypassed the p/s and went 12.72...... weather was pretty much the same. I have to be honest though. I don't care what happened, doing the p/s bypass netted me .5 in the 1/4 and .3 in the 1/8 so I am a happy camper....lol

 

[08blackchrome]

Well 1/2 a sec is just not possible that would be equivalent to 50 hp gain. So I guess I will be the only on that calls B.S. I am not saying that you didnt gain .5 sec but it was not all a result of the p/s delete. I have this mod as well and i did notice a difference up top but not that much. There are a couple people who have dynoed and seen around 7-10 hp difference that means about a tenth max. Sorry bro but congrats on the 12s

 

[chad05gt]

I just changed the Fuel Filter Friday night, I also changed the Oil.
I am trying to get some Ideas on whats up with the car loosing power in 4th. I tried to talk t doug about it, I thought that I had to hve him change my tune to reflect the new Stall, He said no tuning for the converter.

I am watching John (boss281) to see how his fuel trim issue works out.

Did you do something different w/ exhaust... I tried going open headers and could only get 12.400 w/ 110mph (lost .2 and 2mph), and I felt it MOST in 4th gear; nothing there for last 330ft.

 

[2k05gt]

Did you do something different w/ exhaust... I tried going open headers and could only get 12.400 w/ 110mph (lost .2 and 2mph), and I felt it MOST in 4th gear; nothing there for last 330ft.

No Same setup, JBA LT and JBA Catted H, GTA Mufflers

I am now wondering if it has to do with my TCI Super Street Fighter Converter, I notice that as soon as it shifts into 4th just before the trap the RPM's go up and slowly drop, like the converter it trying to catch.
I wonder if the Converter is toast.

 

[2k05gt]

Odd that you would say the p/s delete does nothing. It made a .3 tenths difference in the 1/8 mile and a full half second in the quarter. The on difference between your car and mine that really stands out is the torque converter.

I have a friend that has a stick and he said he didn't notice any change either. Strange, very strange.
Also there are several other board members who have reported success with the p/s delete

Yea, You can clearly see the two runs

PS Delete Belt. (71.6 Deg 30.14 46% Hum DA 831 Ft)
60' - 1.777
330 - 5.142
1/8 - 7.955
mph - 87.10
1000- 10.415
1/4 - 12.503
MPH - 108.00

With PS Belt to normal (71.6 Deg 30.12 46% Hum DA 854 Ft)
60' - 1.777
330 - 5.146
1/8 - 7.957
mph - 87.07
1000- 10.418
1/4 - 12.506
MPH - 105.93 (forget the MPH track malfunction)

My Car is Very Consistant once I get in the groove I can knock off
almost identical times. (I should Bracket Race)

Here is another instance, Last year I was testing whether the stock mufflers cause a loss in power, I made several runs with the mufflers and then removed them and made several more runs - here are the results

I cut Exact 1/4 Mile Times (Car 22)

 

[Boss281]

Damn Scott, you should bracket race!

We "fixed" the fuel trim issue on the tune which, oddly enough, made for a real seat of the pants change experience, but I can't seem to get to the track with this wet weather that seems to prefer weekends around here.

 

[2k05gt]

Damn Scott, you should bracket race!

We "fixed" the fuel trim issue on the tune which, oddly enough, made for a real seat of the pants change experience, but I can't seem to get to the track with this wet weather that seems to prefer weekends around here.

What was involved in fixing the fuel trim? Maybe I need to talk to your tuner?

 

[Boss281]

Scott, there a handful of settings he logged regarding "short term" and "long term" fuel trim settings, and indicated that the values should be within certain boundaries--it's not clear to me why he focused on these parameters. His made the changes to my tune through his tuning software, and the uploaded tune sure seemed to feel much better--if I had to put my finger on it I'd say responsiveness was better.

Personally, I'm surprised none of the major tuners haven't released profiles for diagnostic purposes. Seems to me that using a basic diagnostic suite of parameters, say 15-20 or so, would be a great way to datalog while going down the track, upload the results to the tuner, and let them make changes to a tune as they see fit.

I've searched threads on xcal profiles but haven't really found a good list other than this one: http://www.tricktuners.com/advanced_sct_datalogging.htm . Note no fuel trims are in this list, so it's truly a basic set of things to be watching.

John

 

[psfracer]

No Same setup, JBA LT and JBA Catted H, GTA Mufflers

I am now wondering if it has to do with my TCI Super Street Fighter Converter, I notice that as soon as it shifts into 4th just before the trap the RPM's go up and slowly drop, like the converter it trying to catch.
I wonder if the Converter is toast.

You converter is toast, its locking/unlocking on the big end and your mph is going to be way off. I had the same problem a long time ago with the stock converter, went to the PI multi disc and its been fine ever since.

 

[2k05gt]

You converter is toast, its locking/unlocking on the big end and your mph is going to be way off. I had the same problem a long time ago with the stock converter, went to the PI multi disc and its been fine ever since.

Man That Sucks... I just bought it last August from Jim III @ JDM.
Here is the Link http://s197forum.com/forum/showthread.php?t=5350
He said it had The converter has about 1,500 miles on it from street use and 4 trips to the drag strip. I have 1000 miles and 15 runs should it fry that quickly?

It was in the car for about 800 miles, i really only drive my car on the weekends and live/work within 1 block from home so it doesnt get much use! But that was over about 3-4 months. It was the first converter i put in my car, ive had 2 others since trying get all i can out of the car! This converter actually worked best but ive finally got one thats looser and works better at the track for me! Its however a little crazy for the street! My car is NA and makes about 400 HP at the tires.

JimIII

 

[2k05gt]

Any Ideas, Could the Converter be Fried or would a tune fix it up?
Maybe a Nice Stage II Comp CAMS setup ?