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Datalogging spark advance question

 
Old 02-07-2019, 06:16 PM
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Originally Posted by w00t692 View Post
yeah and then multiply it by .85 to get a more realistic number for the wheel horsepower.
i see what you did there...
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Old 02-08-2019, 10:54 AM
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Car we had that flowed 53 lb/min on the dyno made 430'ish whp. It's a low reading dyno so it's a fair number but....

(53 * 10).85 = 450 hp

So when you get this result, you can be confident that this is probably what this car makes on something like a dynojet that doesn't read as low as the dyno we use. It's a pretty close estimate.
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Old 02-08-2019, 11:00 AM
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Originally Posted by w00t692
Car we had that flowed 53 lb/min on the dyno made 430'ish whp. It's a low reading dyno so it's a fair number but....

(53 * 10).85 = 450 hp

So when you get this result, you can be confident that this is probably what this car makes on something like a dynojet that doesn't read as low as the dyno we use. It's a pretty close estimate.
I have dyno time scheduled next wed so I'll have a pretty good idea. I'm seeing about 46 lb per min at 5700-5800 rpm. I need to get a log up to about 7k after my tuner just sent a revision. I noticed they added .5 timing in at 5-6k rpm and it's still showing -3 spark advance so I feel confident that aspect is safe. Truck is running great with the cams. I haven't logged my e85 nitrous tune yet, just working on my 93 tune currently. Will the maf readings also ring true with a nitrous wet kit?
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Old 02-13-2019, 01:10 PM
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Sorry for the double post, as I just made a separate thread. Just thought I'd post in here because I had a few guys give good insight. Went to the dyno and it put down 492hp/562tq
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Old 02-18-2019, 05:54 PM
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Originally Posted by w00t692 View Post
yeah and then multiply it by .85 to get a more realistic number for the wheel horsepower.
Just thought I'd follow up on this as I've hit the dyno and done some logging. So right at about 6350 RPM, I was making 373 hp to the wheels, and my maf flow rate at the same rpm was 43.9... 439x.85 = 373. So this equation definitely rang true for me. Was done on dynojet fwiw.
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Old 02-18-2019, 08:52 PM
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You figure out that MAF issue?
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Old 02-18-2019, 09:27 PM
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Originally Posted by BadCon
You figure out that MAF issue?
I actually did. SCT remotely logged in and realized it was just the obd2 cord going bad. Replaced, got a few clean logs and sent them off.
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Old 02-20-2019, 07:54 AM
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What RPM should I be shifting at both NA and with nitrous while at the track? I did some more logging yesterday while in Drive(not locking in 3rd or 4th) and noticed it's shifting at about 6900 at WOT. My assumption is with the gt cams and boss intake I should be shifting higher. Somewhere around 7400-7500? Any suggestions are appreciated. This was with my PRX tune. No nitrous.

Last edited by blue5.0; 02-20-2019 at 08:07 AM. Reason: Edit
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Old 02-20-2019, 12:31 PM
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When we tuned a 13 truck recently with fbo, 18 f150 manifold and PMAS intake it liked shifting around 6500 max. I think 6900 is probably a 7k commanded shift that is just shifting a little early. With your mods i'd totally think a 7500 would be where you'd wanna be at. At the very least 7500ish in 1st and 2nd gear and then lower in the later gears unless it forces you to shift again when you don't want to.
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Old 02-20-2019, 01:26 PM
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Originally Posted by w00t692
When we tuned a 13 truck recently with fbo, 18 f150 manifold and PMAS intake it liked shifting around 6500 max. I think 6900 is probably a 7k commanded shift that is just shifting a little early. With your mods i'd totally think a 7500 would be where you'd wanna be at. At the very least 7500ish in 1st and 2nd gear and then lower in the later gears unless it forces you to shift again when you don't want to.
Ok, this was me in 4th then going Wot and dropping to third so I actually didn't log the top of 1st and 2nd. I'll check that out. Thanks.
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