Back from the track after tuning

[12secondv6]

http://www.camarov6.com/ubb/ultimate...;f=10;t=001797

Pre tuning
Temp mid 80's
High humidity that day
Times-
14.527-91.52
14.516-91.66
14.515-91.98
14.568-91.88
14.474-92.18
14.465-91.94
14.548-91.85
Race weight 3114

All runs were done from 6 PM to just before 9 PM soooo cooler temps obviously at night.

Now, runs AFTER tuning:

Keep in mind, runs were from 10 AM to 1 PM.
Today was MUCH hotter than the previous day.
Humidity was NOT as bad.
I was sweating like a crazy person ALL damn day. This was a day of some bracket racing so some runs
are not completely WOT... but I'll indicate it

Good comments:
1) Car shifted at 5,900 rpm for each gear.. it has NOT done that before
2) Temp never went higher than 190, typical temp was just under the 185 mark
3) Speedo is correct
4) Car FEELS MUCH stronger than times indicate

time...9:52
60.....1.973
330....5.856
1/8....9.125
mph....75.05
1000...11.972
1/4....14.409
mph....92.22

time...10:02
60.....2.033
330....5.962
1/8....9.263
mph....74.48
1000...12.131
1/4....14.587
mph....91.53

time...10:42
60.....1.991
330....5.874
1/8....9.141
mph....75.29
1000...11.980
1/4....14.409
mph....92.57

time...11:17
60.....2.002
330....5.892
1/8....9.164
mph....75.25
1000...12.004
1/4....14.432
mph....92.51

time....12:17
dial in.14.42
r/t.....083
60......1.971
330.....5.866
1/8.....9.140
mph.....75.22
1000....11.985
1/4.....14.424
mph.....92.06
let off top end slightly

time....12:43
dial in.14.42
r/t.....311
60......2.032
330.....5.940
1/8.....9.225
mph.....74.92
1000....12.078
1/4.....14.524
mph.....91.63
let off top end a bit more

time....12:56
dial in.14.42
r/t.....199
60......2.012
330.....5.923
1/8.....9.209
mph.....74.93
1000....12.061
1/4.....14.496
mph.....92.29
BOG off the line, damn throttle cable is coming out.

Every single run the throttle gets partially stuck when I let off. The throttle cable has partially sheared away inside. Sometimes I get a bog off the line, that is next to be addressed.


So......this is with tuning....

I'm not making rash judgements.

I noticed that since the tuning I was trapping 75+ mph in the 1/8, pre tuning I was 74.

I noticed that since the tuning I was trapping 92+ mph in the 1/4, pre tuning I was 91.

I was expecting... 14.2-14.3

I have seen a reduction in ET and a gain in MPH, but no where NEAR what I was hoping for.

I want to wait another month or so to see how the bird reacts w/ cooler temps. I'm about 1/2 second off my best times N/A.

Keep in mind, my bird is NOT an N/A car, it is a nitrous car. I don't expect much gains N/A usually. This could be the mod to take me from a best of 14.07 to high 13's.

Temp's were in the low 90's - high 80's

The drivability has DEFINATELY improved due to correct speedo, shift points, fan temp, etc.

Race weight was 3100 pounds even
Last week it was 3114 pounds

Car is lighter now... new nitrous set up is in the bird so it increases weight... slightly less gas now... driver lost a bit of weight too

I was 196 pounds last week
This week 186 pounds

Tire psi reamined the same from last week
Shock settings front and rear were the same

The past couple months, the bird isn't stalling as high as it used to, I remember the days of 2900-3000 rpm launches.

Now, I'm seeing 2600-2800 rpm's

I haven't quite figured out that one yet... the bird just pushes forward which annoys me.

Well, I'm keeping an open mind on this tuning.

Also, remember this... this was MAIL ORDER tuning. The BEST way to get tuning done is OBVIOUSLY on the dyno with access to adjustments. I should redyno the bird to see where it is now.

I also have a perm SES light now.... 1336... crankshaft position sensor relearn.

We shall see........

[skorpion317]

i think with better temps you'll see results. you'll nail 13's N/A this year, just wait and see.

[ReodDai]

I think you have a weight fetish

[RedFrk13]

The computer definitly helped since u gain a MPH on a hotter day. Getting that relearn done to the sensor should also help it run better.

[BLLDOGG]

good job. any gain is a good thing [img]smile.gif[/img]

[merlinsrealm]

James, you of all people know how I am with tuning.....Based on your numbers and issues you still have with the car I would not make judgement unit Oct/Nov......

Keep me informed

[njspder]

if the car is starting to push at a lower stall speed i have to ask when was teh last time you did your brakes? stops from high speed(ie:slowing at teh end of teh track) can hurt fluid even if you don't jump right on teh brakes hard. the repeated temp increase will eat it up.
bleed out teh brakes really good and make sure the calipers are moving nice and free when pumped.

later
tim

[Shirl]

Yesterday was a TERRIBLE day for racing.. hot and humid as hell. I washed my bf's car and detailed it for like 4 hours and it sprinkled. Then I waited, wiped it off and covered it as quickly as I could cuz I could hear thunder in the distance, and sure enough... it POURED. 2 hours later, I took the cover off cuz we were gonna take it out last night and WHAMMO!! It poured rain again... at that point, I said F this and just let it get wet and messed up... wasted a whole day.

Anyway, you gained .056 and .63mph. You weighed less though (114lbs less). So, it looks like the biggest factor is the temperature and humidity in figuring out whether the tuning really helped or not. Also, did you try to clear the code or is it just coming back up? I'm wondering if that sensor will eventually adjust to the new tuning or not. I'd call them right away and find out how to remedy that problem.

['98 BlackBird]

Hey James, I had the same thing after my tuning. It will take a while for the car to "learn" the new programming. Be patient. I did not see much of a change in time for the first 5-10 runs, but after that, I saw a good .1-.15 sec off. Can you feel the 1st to 2nd shift any firmer?

[12secondv6]

Race weight was 3100 pounds even
Last week it was 3114 pounds

14 pound difference

[andrew.brandon]

james did you say you were still running 3.23's? if so why?

[12secondv6]

3:23's

Why?
1.584 60 foot spinning.

I have NO need for MORE gear even though almost EVERYONE on this board tells me go with a higher gear.

If I went with a higher gear I would spin EVEN MORE!

[Shirl]

14 pound difference

My bad... did you call HP yet about the code?

[Notoriousdom]

Originally posted by 12secondv6:
3:23's

Why?
1.584 60 foot spinning.

I have NO need for MORE gear even though almost EVERYONE on this board tells me go with a higher gear.

If I went with a higher gear I would spin EVEN MORE!

Numerically higher gears spin LESS at any given RPM. ;)

More revolutions of the drive shaft are required to spin the wheel the same way. So you would be coming out spinning LESS. ;)

You seem to be nitroused focused so stick with what you got. No need for steep gears on nitrous.

[Tru2Chevy]

Originally posted by Notorious D.O.M.:
Numerically higher gears spin LESS at any given RPM. ;)

More revolutions of the drive shaft are required to spin the wheel the same way. So you would be coming out spinning LESS. ;)

This is true - however, numerically higher gears will offer more tq multiplication, which will make it much easier to spin the tires. So if he were to step up to say, 3.73's, then he would most likely have more traction issues off the line. While the tires may be spinning less at a given RPM, the numerically higher gears will let the engine rev up to a higher RPM much faster, thus creating even more wheelspin.

- Justin