Dyno Results???
Thread Starter
|
Member
Joined: Jul 2001
Posts: 29
Likes: 0
From: Cromwell, IN
Dyno Results??? (Link to Video Added)
I finally got the Lightning to the Dyno yesterday afternoon. I was in Chicago for the weekend and had some free time, thanks to those who recommended ATR in Joliet! Al was a hell of a guy.
There was a little bit of a delay, but the good thing about that was I got to watch the dyno in operation. There was a 420ci Fast Times chevy w/300hp NOS strapped down when I arrived, I'll post some videos of that later for those who are interested.
THE RUN:
To get to the run's(actually only one)
We got the lightning strapped down and the wideband and rpm pickup hooked up. ATR has dynoed probably 10 other lightnings, so I am guessing they had a good idea of what to expect. They fired up the L and started through the gears. This being the first time I had ever been on the dyno I wasn't sure how they would bring the truck up to speed and keep it from down shifting into 3rd, or if 3rd is the gear the dyno is run in? Regardless I believe that the truck was well into 4th when the dyno began. Tomorrow I will post the video that I took, but it appears that the truck down shifted for a few seconds and then upshifted. Not sure, but this may have caused the spike in the curve(See Attached Dyno Sheet).
THE RESULTS:
Onto the results, here is the Dyno Sheet PrintoutDYNO RUN . I will post the actual dyno file tomorrow for those who want to look further into the run.
There are many questions that lead to me deciding the first run was enough.
1. You will see that the Torque is a little bit on the low side from what most have seen with my mod's. My question is where is peak torque on our trucks? My data logging started at approx. 4000rpm's and measured 483.9ft-lbs, at this measurement the curve was headed down. Would I have seen more torque if the run would have been started earlier?
2. HP was a max of 433.1hp, but for some reason I had a spike which I believe caused the high number? If you look just after the spike I did go just over 400, 401.3hp. What could have caused this spike, the truck shifting?
3. A/F Ratio was the reason I only ran a single pass. I had planned to run 3 passes, but when I saw that the A/F was steady at 13.5:1 I was somewhat concerned. I do not know what optimum is, but I was guessing right around 12:1? I have absolutely no detonation, that I can hear. I had LFP re-burn my chip because the previous owner EXCITED had blown his engine with the exact setup I am running. What do you guys think, re-burn by LFP or move on to another tuner?
CONCLUSION:
The truck is running lean & mean, litterally! Should I be concerned with the A/F or should I be safe with the setting? If this is a problem, would an adjustable regulator help, or should I just have the chip re-burnt? Thanks for all the help, I can't wait to start blowing unsuspecting F-Bodies off the street!
Brent
There was a little bit of a delay, but the good thing about that was I got to watch the dyno in operation. There was a 420ci Fast Times chevy w/300hp NOS strapped down when I arrived, I'll post some videos of that later for those who are interested.
THE RUN:
To get to the run's(actually only one)
We got the lightning strapped down and the wideband and rpm pickup hooked up. ATR has dynoed probably 10 other lightnings, so I am guessing they had a good idea of what to expect. They fired up the L and started through the gears. This being the first time I had ever been on the dyno I wasn't sure how they would bring the truck up to speed and keep it from down shifting into 3rd, or if 3rd is the gear the dyno is run in? Regardless I believe that the truck was well into 4th when the dyno began. Tomorrow I will post the video that I took, but it appears that the truck down shifted for a few seconds and then upshifted. Not sure, but this may have caused the spike in the curve(See Attached Dyno Sheet).THE RESULTS:
Onto the results, here is the Dyno Sheet PrintoutDYNO RUN . I will post the actual dyno file tomorrow for those who want to look further into the run.
There are many questions that lead to me deciding the first run was enough.
1. You will see that the Torque is a little bit on the low side from what most have seen with my mod's. My question is where is peak torque on our trucks? My data logging started at approx. 4000rpm's and measured 483.9ft-lbs, at this measurement the curve was headed down. Would I have seen more torque if the run would have been started earlier?
2. HP was a max of 433.1hp, but for some reason I had a spike which I believe caused the high number? If you look just after the spike I did go just over 400, 401.3hp. What could have caused this spike, the truck shifting?
3. A/F Ratio was the reason I only ran a single pass. I had planned to run 3 passes, but when I saw that the A/F was steady at 13.5:1 I was somewhat concerned. I do not know what optimum is, but I was guessing right around 12:1? I have absolutely no detonation, that I can hear. I had LFP re-burn my chip because the previous owner EXCITED had blown his engine with the exact setup I am running. What do you guys think, re-burn by LFP or move on to another tuner?
CONCLUSION:
The truck is running lean & mean, litterally! Should I be concerned with the A/F or should I be safe with the setting? If this is a problem, would an adjustable regulator help, or should I just have the chip re-burnt? Thanks for all the help, I can't wait to start blowing unsuspecting F-Bodies off the street!
Brent
Last edited by zrwhat; Mar 16, 2003 at 09:07 PM.
Senior Member
Joined: Jul 2002
Posts: 512
Likes: 0
From: Rahway, NJ
You are probably well over 500 lb/ft of torque. They should have started the run at approx. 3000rpm in drive at about 70mph, and ended the run at about 5800 rpm. At that speed, the truck should not downshift and you will produce some nice curves...We have similar mods, and my truck produced 553 RWTQ at 3400 rpm, and 425 RWHP at about 4500 rpm. You a/f does sound a bit high, defenitely have the program checked....
Senior Member
Joined: Apr 2001
Posts: 5,939
Likes: 0
From: Warner Robins, Ga, CSA
Did they turn the overdrive off? I hope so. Dyno it in 3rd only and as it's been said, the pull should start at about 3-3100 rpms and end at redline.
Downshifts will cause a spike.
Dan
Downshifts will cause a spike.
Dan
Last edited by LIGHTNINROD; Mar 16, 2003 at 07:49 PM.
Thread Starter
|
Member
Joined: Jul 2001
Posts: 29
Likes: 0
From: Cromwell, IN
Still Confused?
Ok, I finally am back in Indiana and had a chance to pull up the dyno run on the Dynojet RunViewer. Needless to say, I am very confused now. Can someone take a look at the dyno run and give me your thoughtsDyno Run File ?
After review of the file I did find out that the run was actually started way before the 4000 rpms that the printout said, it was actually around 2800 rpms. When looking at this data the numbers were very confusing.
Max Torque@3700rpms=616.04 ft-lbs
Max HP@3700rpms=433.98 hp
A/F is 14.85:1@3200rpms and then comes down to 13.5:1@5300rpms
I hope someone out there can make some sense of these numbers.
Thanks
Brent
After review of the file I did find out that the run was actually started way before the 4000 rpms that the printout said, it was actually around 2800 rpms. When looking at this data the numbers were very confusing.
Max Torque@3700rpms=616.04 ft-lbs
Max HP@3700rpms=433.98 hp
A/F is 14.85:1@3200rpms and then comes down to 13.5:1@5300rpms
I hope someone out there can make some sense of these numbers.
Thanks
Brent
Thread Starter
|
Member
Joined: Jul 2001
Posts: 29
Likes: 0
From: Cromwell, IN
LIGHTNINROD: That must of been what it was, see video
For those interested, here is a link to the dyno run.
Dyno Run @ ATR in Joliet,IL on Saturday 3/24/03
Is that a shift that I hear?
For those interested, here is a link to the dyno run.
Dyno Run @ ATR in Joliet,IL on Saturday 3/24/03
Is that a shift that I hear?
