Updated: Comptech SC Dyno and AFR
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Joined: Apr 2002
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From: Northern NJ
Updated: Comptech SC Dyno and AFR
So when I first had my S2k dyno'd there was what seemed to be some detonation after 7k and the AFR was running 12.5:1 in that same range. I checked the plugs and it turns out the previous owner was running the OEM plugs at stock gap. I replaced the plugs with NGK resistor copper plugs (BK7RE?) added a fuel pressure gauge and redyno'd.
The runs were we went to 8k the power was up to where it was expected to be and after adding in about ~2-3lbs of fuel pressure the AFR is down around 12.2:1-12.4:1 in that same range with no detectable missing or detonation. The tuner said it seemed fine and he would leave it alone so I did.
Here are todays pulled corrected ( you can see the power falling off as it was getting hotter) and then the first and last pull today vs the first and last pull on the dyno day. It look like I'm where I wanted to be, safe, so I'll leave it alone.
Thanks for the advice all of you have offered to help get this worked out.
Power pulls from today
AFR from today
Power comparison vs dyno day with stock plugs
AFR comparison vs dyno day with stock plugs fuel pressure increased ~2 lbs
The runs were we went to 8k the power was up to where it was expected to be and after adding in about ~2-3lbs of fuel pressure the AFR is down around 12.2:1-12.4:1 in that same range with no detectable missing or detonation. The tuner said it seemed fine and he would leave it alone so I did.
Here are todays pulled corrected ( you can see the power falling off as it was getting hotter) and then the first and last pull today vs the first and last pull on the dyno day. It look like I'm where I wanted to be, safe, so I'll leave it alone.
Thanks for the advice all of you have offered to help get this worked out.
Power pulls from today
AFR from today
Power comparison vs dyno day with stock plugs
AFR comparison vs dyno day with stock plugs fuel pressure increased ~2 lbs
Joined: Sep 2003
Posts: 10,301
Likes: 18
From: New Jersey
Good to see the numbers are where they should be.
A/F seems to be within a safe range expect for that little spike. I'm sure a little tuning with an emanage would yeild some nice mid-range gains but if your happy, thats what counts
A/F seems to be within a safe range expect for that little spike. I'm sure a little tuning with an emanage would yeild some nice mid-range gains but if your happy, thats what counts
Thread Starter
Joined: Apr 2002
Posts: 1,511
Likes: 1
From: Northern NJ
Yeah Chris said the spike was his software if you're talking about that dramatic one after VTEC on the one pull. Cars feels great and I feel much more comfortable driving it hard now so the peace of mind was worth it. Having nobody else there and getting some time to talk to Chris I'd recommend him and his shop to anyone. Down to earth guy that wants the best for his customers and wasnt trying to rape me or talk smack about imports even though his bread and butter is Fords.
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Joined: Sep 2003
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From: New Jersey
Originally Posted by ThatPreludeGuy,Feb 15 2008, 03:27 PM
Yeah Chris said the spike was his software if you're talking about that dramatic one after VTEC on the one pull. Cars feels great and I feel much more comfortable driving it hard now so the peace of mind was worth it. Having nobody else there and getting some time to talk to Chris I'd recommend him and his shop to anyone. Down to earth guy that wants the best for his customers and wasnt trying to rape me or talk smack about imports even though his bread and butter is Fords.
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