My Dyno Results...
Thread Starter
Race Director
Joined: Aug 2003
Posts: 11,043
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From: San Jose Pat Tillman - American Hero
My Dyno Results...
Got in three pulls today at a local get-together with a great bunch of fellow vette owners (plus an F-Body and a Vega!). I was actually pretty pleased with my numbers, but my car seems to be running pretty lean straight across the board.
1st pull:
317hp / 317tq ... 79* outside, 27% humidity
2nd pull:
324hp / 325tq ... 81*, 27%
3rd pull:
323hp / 322tq ... 81*, 26%
Air/Fuel was somewhere between 14.5-15.0, and it was straight as a board all the way across. On the first pull, there was a pretty sharp dip and recovery (about 15hp/tq) between 5500RPM and 6k. There was a similar, though less drastic, drop on the second pull at exactly the same spot on the curve. On the third pull, it was completely smooth. I'm not sure what the deal was there - the tech said maybe some kind of electrical gremlin or mild detonation? I dunno. Anyway, I'm pretty happy with the numbers all in all. Unfortunately, I don't have any baseline numbers to compare it to, but I just imagine that my LT4 made (stock) right around what others made (290ish).
1st pull:
317hp / 317tq ... 79* outside, 27% humidity
2nd pull:
324hp / 325tq ... 81*, 27%
3rd pull:
323hp / 322tq ... 81*, 26%
Air/Fuel was somewhere between 14.5-15.0, and it was straight as a board all the way across. On the first pull, there was a pretty sharp dip and recovery (about 15hp/tq) between 5500RPM and 6k. There was a similar, though less drastic, drop on the second pull at exactly the same spot on the curve. On the third pull, it was completely smooth. I'm not sure what the deal was there - the tech said maybe some kind of electrical gremlin or mild detonation? I dunno. Anyway, I'm pretty happy with the numbers all in all. Unfortunately, I don't have any baseline numbers to compare it to, but I just imagine that my LT4 made (stock) right around what others made (290ish).
Melting Slicks
Joined: Jan 2002
Posts: 2,784
Likes: 3
From: Atlanta GA
Very nice numbers. I was waiting to see what you put down considering we have a very close setup!
Awsome job
EDIT... post that dyno sheet too! 14-15:1 A/F is pretty darn lean. Get some fuel in there like they said above
Awsome job
EDIT... post that dyno sheet too! 14-15:1 A/F is pretty darn lean. Get some fuel in there like they said above
Le Mans Master
Joined: Aug 2002
Posts: 6,080
Likes: 3
From: Clearwater FL
St. Jude Donor '06
Nice #'s! Did you do your long tubes with cats after you had your Corsa exhaust? Reason I ask is I heard a LT1 with Corsa, LT heardes without cats and it was obnoxiously loud. I was wondering if the RT cats help a little or a lot with noise levels...
Thread Starter
Race Director
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From: San Jose Pat Tillman - American Hero
Originally Posted by StealDads67
... post that dyno sheet too! 14-15:1 A/F is pretty darn lean. Get some fuel in there like they said above
Originally Posted by C4DC
Nice #'s! Did you do your long tubes with cats after you had your Corsa exhaust? Reason I ask is I heard a LT1 with Corsa, LT heardes without cats and it was obnoxiously loud. I was wondering if the RT cats help a little or a lot with noise levels...
Thread Starter
Race Director
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From: San Jose Pat Tillman - American Hero
Here's that printout...
Blue was my first pull - you can see that drastic drop between 3500 and 4000 on that run. I don't know really what caused that, but it didn't do it on the other two. Red was my 2nd (and best) pull, but there was still the little "droop" in the upper RPM range. Green was the last pull - HP numbers virtually the same, and Tq was just 3 lb.ft lower.
Blue was my first pull - you can see that drastic drop between 3500 and 4000 on that run. I don't know really what caused that, but it didn't do it on the other two. Red was my 2nd (and best) pull, but there was still the little "droop" in the upper RPM range. Green was the last pull - HP numbers virtually the same, and Tq was just 3 lb.ft lower.
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Safety Car
Joined: Sep 2003
Posts: 3,692
Likes: 5
From: Hayward CA
I was there also - My best pull was 294rwhp - 309 lb/ft tq...... with the mods in my sig. Mine was also very lean.... detonating above 5500 rpm. I think I'll do some headers...hi flo cats....and go back to the dyno.
Thread Starter
Race Director
Joined: Aug 2003
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From: San Jose Pat Tillman - American Hero
Originally Posted by TM-96CE
I think I'll do some headers...hi flo cats....and go back to the dyno.
You guys would've had to have been there to get that one. If you are really gonna do headers, get in on that Exotic Muscle group purcase and save yourself $100.
Thread Starter
Race Director
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From: San Jose Pat Tillman - American Hero
Originally Posted by STL94LT1
At WOT these numbers are dangerously lean.
Safety Car
Joined: Sep 2003
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From: Hayward CA
Originally Posted by Perfusion
Awesome! Then heads/cam...then bottom end...then forced induction...then part the car out! J/k. You guys would've had to have been there to get that one. If you are really gonna do headers, get in on that Exotic Muscle group purcase and save yourself $100.
You guys would've had to have been there to get that one. If you are really gonna do headers, get in on that Exotic Muscle group purcase and save yourself $100.Baby steps....... that's what I'm trying to convice myself to take. I have JBA headers on my work bench....gotta keep it legal
Heads and cam aren't far off. Crane makes a cam with a CARB EO#. Who knows.........maybe by the summer dyno day ( hint hint)
Le Mans Master
Joined: Jul 1999
Posts: 8,683
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From: Phoenix AZ
Originally Posted by Perfusion
So what should I do? New O2 sensors? AFPR? Injectors? I definitely wanna get that fixed if it's something that (as it sounds) is that dangerous...
Safety Car
Joined: Sep 2000
Posts: 3,524
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From: Hinckley Ohio
Originally Posted by Perfusion
So what should I do? New O2 sensors? AFPR? Injectors? I definitely wanna get that fixed if it's something that (as it sounds) is that dangerous...
O2 sensors don't come into play at WOT......
I think reprogramming injectors is better than AFPR, but I suppose either approah will work..
Your stock injectors ought to be adequate for this horsepower level...
To be honest though I have to really question whether the A/F monitor on the dyno was really working.....I have never seen such a straight line..and the red line is flat from even before the start????
Great results from your mods.....
Safety Car
Joined: Jun 2004
Posts: 4,197
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From: lafayette co
Great numbers.
Cam and Heads are a must! Although I got great results with the stock LT4 heads!!
I'm going to wait till Jan '05 to order my Longtubes, and HiFlo Cats.
Weather will be ****ty around here soon enough anyway!
Cam and Heads are a must! Although I got great results with the stock LT4 heads!!
I'm going to wait till Jan '05 to order my Longtubes, and HiFlo Cats.
Weather will be ****ty around here soon enough anyway!
Burning Brakes
Joined: Jan 2003
Posts: 784
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Originally Posted by Perfusion
1st pull:
317hp / 317tq ... 79* outside, 27% humidity
2nd pull:
324hp / 325tq ... 81*, 27%
3rd pull:
323hp / 322tq ... 81*, 26%
:
317hp / 317tq ... 79* outside, 27% humidity
2nd pull:
324hp / 325tq ... 81*, 27%
3rd pull:
323hp / 322tq ... 81*, 26%
:
Team Owner
Joined: Aug 1999
Posts: 24,017
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St. Jude Donor '10
Originally Posted by LT4BUD
Seems to me you need to get your computer reprogrammed......
O2 sensors don't come into play at WOT......
I think reprogramming injectors is better than AFPR, but I suppose either approah will work..
Your stock injectors ought to be adequate for this horsepower level...
To be honest though I have to really question whether the A/F monitor on the dyno was really working.....I have never seen such a straight line..and the red line is flat from even before the start????
Great results from your mods.....
O2 sensors don't come into play at WOT......
I think reprogramming injectors is better than AFPR, but I suppose either approah will work..
Your stock injectors ought to be adequate for this horsepower level...
To be honest though I have to really question whether the A/F monitor on the dyno was really working.....I have never seen such a straight line..and the red line is flat from even before the start????
Great results from your mods.....