So.... back from the dragstrip round 4!
09-30-2010, 02:46 AM
#21
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BASH BASH BASH!
just kidding. Something went wrong, and it'll get resolved. Cheer up. The gains are dyno-proven and pulls proven. Picking up only one tenth on your previous times is just not in line with what we have seen from APR...who are honest to a fault, so I don't think anything they shared was off.
Looking forward to seeing it get resolved.
While I don't think 12.4 is something you guys should be 'expecting'...I think this car should trap closer to 113mph, not 111. My prediction was 12.6 @ 113 for on the average for APR tuned + catback B8 S4s. I stand by that. Do I win a prize?
This car however running so well on stock ECU, I figured would be more like 12.50. Most of the others are closer to 13.0-13.2 stock. I'd expect 12.7@112 out of those cars, but not this one.
The 60 foot times are not awesome...1.85 or so is kinda 'good' but I guess the transmission limits your ability to launch harder. The 60 foot vs. 330ft vs .1/8th vs 1/4 times are all very consistent. Neat that your fastest times were the last ones.
p.s. what were the conditions on the good pre-tune runs?
just kidding. Something went wrong, and it'll get resolved. Cheer up. The gains are dyno-proven and pulls proven. Picking up only one tenth on your previous times is just not in line with what we have seen from APR...who are honest to a fault, so I don't think anything they shared was off.
Looking forward to seeing it get resolved.
While I don't think 12.4 is something you guys should be 'expecting'...I think this car should trap closer to 113mph, not 111. My prediction was 12.6 @ 113 for on the average for APR tuned + catback B8 S4s. I stand by that. Do I win a prize?
This car however running so well on stock ECU, I figured would be more like 12.50. Most of the others are closer to 13.0-13.2 stock. I'd expect 12.7@112 out of those cars, but not this one.
The 60 foot times are not awesome...1.85 or so is kinda 'good' but I guess the transmission limits your ability to launch harder. The 60 foot vs. 330ft vs .1/8th vs 1/4 times are all very consistent. Neat that your fastest times were the last ones.
p.s. what were the conditions on the good pre-tune runs?
first visit
Weather was 80F, 54-56% humidity, 60-61 dew point, 5-10 mph breeze, and sunny/partly overcast. The track sits at about 1,250 feet elevation. Unfortunately, I forgot the weather station but a guy was there with one and I looked at his a few times. His claimed 2900-3100... but I think it was a little high... probably more like 2500ish. Either way not great!
second visit
70 degrees, 55% humidity, 55 dewpoint, no wind, 1900ish DA..... Really a very nice day for drag racing in June.... Unfortunately, this produced a huge crowd so I only got 3 runs..
third visit
Conditions.... 67 degrees, 53% humidity, 53 dewpoint, 5-10mph cross wind, overcast, and 30ish BP.... DA was 1500ish...
last night
62F, 70% humidity, 29.92BP DA of 1900....
So about the same DA as the 2nd visit when I ran 12.85, 12.90 and 12.91
Thoughts....
Thanks Ron
09-30-2010, 05:59 AM
#23
My guess? There was still some of that 93 in the tank and lines mixed with the 100, just enough to cause the ECU to pull timing. Note how every pass seemed to improve a bit.
Hope APR finds the problem. I would have expected at least a low to mid 12.5.
Hope APR finds the problem. I would have expected at least a low to mid 12.5.
09-30-2010, 06:32 AM
#24
AudiWorld Senior Member
Thread Starter
I thought about that, but I only had less than 1/16 of a tank when I filled up with 100... then drove a ways before getting a flat, then drove to the tire store, then back home and parked the car.... I then let the car run 30ish minutes after installing the chip, then drove around 30-45 minutes in the car, and then to the track and burned up about 1/2 tank so I would think it should have been burned through or very very diluted.... I could be wrong but I don't think that is the issue.... I was expecting better than 12.5 but that would be another .1-.2 better than my runs... Honestly, the trap speed is more concerning to me...
09-30-2010, 08:50 AM
#26
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So.....I am completely ignorant when it comes to ECU tune/improvements/problems.
And I echo Prime's sentiment in not wanting to bash APR as they have been posting their dyno figures and what not.
But just as an educational exercise, at least for me, what COULD be the problem? And I don't mean obvious things like the flash was not installed or he didn't really have 100 octane in the tank.
An example of what I am talking about: Prime DID have a problem with a tire blowout last week. Could tire pressure effect his time to this degree?
And I echo Prime's sentiment in not wanting to bash APR as they have been posting their dyno figures and what not.
But just as an educational exercise, at least for me, what COULD be the problem? And I don't mean obvious things like the flash was not installed or he didn't really have 100 octane in the tank.
An example of what I am talking about: Prime DID have a problem with a tire blowout last week. Could tire pressure effect his time to this degree?
09-30-2010, 08:58 AM
#27
AudiWorld Senior Member
Thread Starter
So.....I am completely ignorant when it comes to ECU tune/improvements/problems.
And I echo Prime's sentiment in not wanting to bash APR as they have been posting their dyno figures and what not.
But just as an educational exercise, at least for me, what COULD be the problem? And I don't mean obvious things like the flash was not installed or he didn't really have 100 octane in the tank.
An example of what I am talking about: Prime DID have a problem with a tire blowout last week. Could tire pressure effect his time to this degree?
And I echo Prime's sentiment in not wanting to bash APR as they have been posting their dyno figures and what not.
But just as an educational exercise, at least for me, what COULD be the problem? And I don't mean obvious things like the flash was not installed or he didn't really have 100 octane in the tank.
An example of what I am talking about: Prime DID have a problem with a tire blowout last week. Could tire pressure effect his time to this degree?
My theroy at this point is the tune didn't take and the small improvements are from the 100 octane.... Should know by tonight! later Ron
09-30-2010, 09:04 AM
#28
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Once again, I preface this by saying I am completely ignorant regarding ECU tunes.
How can the tune not "take"? And maybe I am being paranoid but how can the average Joe then be sure that his tune DID "take"?
I realize you may not have the answers either. Just thinking out loud....
How can the tune not "take"? And maybe I am being paranoid but how can the average Joe then be sure that his tune DID "take"?
I realize you may not have the answers either. Just thinking out loud....
09-30-2010, 09:44 AM
#29
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Once again, I preface this by saying I am completely ignorant regarding ECU tunes.
How can the tune not "take"? And maybe I am being paranoid but how can the average Joe then be sure that his tune DID "take"?
I realize you may not have the answers either. Just thinking out loud....
How can the tune not "take"? And maybe I am being paranoid but how can the average Joe then be sure that his tune DID "take"?
I realize you may not have the answers either. Just thinking out loud....
09-30-2010, 09:51 AM
#30
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A boost gauge would be very handy here as well.