View Poll Results: Good, Bad, or Ugly
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Extrapolated C5 Z Dyno Graph
Thread Starter
Melting Slicks
Joined: Feb 2007
Posts: 3,297
Likes: 398
From: Raleigh Suburbs
Interesting questions/comments - let me tackle 'em,
Yes. Not sure why. Potentially because of the Inaccurate Nature of the MAF when logged? Seems to be worse with more RPM..
Few Performance Modifications:
- Top side of the Airbox cut out (Alternate "zip tie mod")
- K&N Filter (Stock Dimension)
- Full Hand-Tune (On the Street)
==> Projected to have gained ~50 bhp with this setup (from the factory's 405)
Yes, I noticed, interesting it is! Why the hell would I run out of injector with only a few performance modifications?? Edit: Plausibly, the age of the Motor (<100k)?
Yes. Not sure why. Potentially because of the Inaccurate Nature of the MAF when logged? Seems to be worse with more RPM..
What is the intake setup?
- Top side of the Airbox cut out (Alternate "zip tie mod")
- K&N Filter (Stock Dimension)
- Full Hand-Tune (On the Street)
==> Projected to have gained ~50 bhp with this setup (from the factory's 405)
Also you are running out of injector.
Last edited by Hitman227; Sep 2, 2019 at 12:28 PM. Reason: Additional analysis
Racer
Joined: Mar 2008
Posts: 457
Likes: 52
From: Elkhart, Texas
Interesting questions/comments - let me tackle 'em,
Yes. Not sure why. Potentially because of the Inaccurate Nature of the MAF when logged? Seems to be worse with more RPM..
Few Performance Modifications:
- Top side of the Airbox cut out (Alternate "zip tie mod")
- K&N Filter (Stock Dimension)
- Full Hand-Tune (On the Street)
==> Projected to have gained ~50 bhp with this setup (from the factory's 405)
Yes, I noticed, interesting it is! Why the hell would I run out of injector with only a few performance modifications?? Edit: Plausibly, the age of the Motor (<100k)?
Yes. Not sure why. Potentially because of the Inaccurate Nature of the MAF when logged? Seems to be worse with more RPM..
Few Performance Modifications:
- Top side of the Airbox cut out (Alternate "zip tie mod")
- K&N Filter (Stock Dimension)
- Full Hand-Tune (On the Street)
==> Projected to have gained ~50 bhp with this setup (from the factory's 405)
Yes, I noticed, interesting it is! Why the hell would I run out of injector with only a few performance modifications?? Edit: Plausibly, the age of the Motor (<100k)?
Tune is a bit rich most likely as to why you are running out of injector. I don't think it picked up 50hp with a filter and a tune. I'd recommend to put it on a dyno to confirm the health/logs and a wideband to confirm the target AFR at WOT under PE is accurate, overall not bad at all it looks like!
Last edited by niterydr; Sep 13, 2019 at 11:01 AM.
Thread Starter
Melting Slicks
Joined: Feb 2007
Posts: 3,297
Likes: 398
From: Raleigh Suburbs
Tune is a bit rich most likely as to why you are running out of injector. I don't think it picked up 50hp with a filter and a tune. I'd recommend to put it on a dyno to confirm the health/logs and a wideband to confirm the target AFR at WOT under PE is accurate, overall not bad at all it looks like!
I estimate about 430, NOT 450, with the modifications that I have.
Here is the analysis information I concluded subsequently:
>> Negative Characteristics (Suggestions Welcome):
- Constrictive intake track (because only minor bolton)
- Running out of / running spurt of an injector plot (Wtf)
- Much lower than ideal spark (never got around to this)
- IAT Temps soaring upon throttle (engine-bay heat-soak)
- MAF curve wavy like an ocean wave far from shore upon greater Revolutions (Heh)
- HP & TQ Curves look correct, for LS6
- Able to Derive Peaks of HP & TQ @ Specific RPM
- O2 sensor plot looks nice and smooth at just > 900
- Able to gauge 6000+ RPM Performance
- No Knock Retard present
- Good Street Load Test
As far as running out of Inducted Air, with increased RPM's - one Vararam big MAF bigger TB 102 IM etc, should quell this just fine. Opinions?
Pretty darn good for what it is, with just hand tune. Very Fast!
As far as real power, the Graph/Data reports 456 brake horse power, which seems optimistic for the modifications. Thoughts? I'm believing it could be 430 bhp without blinking an eye.
Melting Slicks
Joined: Nov 2013
Posts: 2,049
Likes: 316
From: USA
I've had good luck using virtual dyno to give me relative accurate and consistent results without actually going to a dyno. Ideal conditions would be flat road with no wind, and get a log in both directions. And all subsequent runs would be similar conditions and same spot on the road. Vdyno can account for minor temp/pressure deviation but not winds, slope etc.
Once you get a baseline for your setup you can tweak the correction factor to "match" your local dyno or whatever you wanna do.
Required params are Time, RPM, TPS and it can also display AFR and boost.
Here's 2 back to back runs I did on the same stretch of road in opposite directions:
Once you get a baseline for your setup you can tweak the correction factor to "match" your local dyno or whatever you wanna do.
Required params are Time, RPM, TPS and it can also display AFR and boost.
Here's 2 back to back runs I did on the same stretch of road in opposite directions:
Last edited by aaronc7; Sep 13, 2019 at 06:01 PM.
