LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

First time at dyno, what do you think *PICS*

Thread Tools
 
Search this Thread
 
Old Oct 25, 2003 | 01:42 PM
  #1  
NVetro's Avatar
Thread Starter
Registered User
 
Joined: Jun 2003
Posts: 1,439
From: New Jersey
First time at dyno, what do you think *PICS*

Just got back from the dyno here localy. My best pull was: 283.8 rwhp 329.3 rwtq. Below is a link to this dyno run's print out. Tell me what you think, the guy there said i mite be running rich but then agian he is an import dude Lemme know, post comments and stuff.

http://www.webideas.net/misc%20art/dynopull.jpg
Old Oct 25, 2003 | 02:04 PM
  #2  
NVetro's Avatar
Thread Starter
Registered User
 
Joined: Jun 2003
Posts: 1,439
From: New Jersey
thanks, im VERY happy with them. I thought for sure i was gonna be in the 260's from what people say. I dont have much done, stock exhaust is killing me rwhp wise.

Last edited by NVetro; Oct 25, 2003 at 02:29 PM.
Old Oct 25, 2003 | 02:38 PM
  #3  
94formulabz's Avatar
Registered User
 
Joined: Apr 2003
Posts: 1,591
From: PA
Looks good. You were selling yourself short with your list of mods only expecting 260.

Do you have a printout of the conditions so that you can figure out the SAE correction factor? Actual HP numbers are pretty worthless unless you are comparing it to other runs made the same day immediately before and after.
Old Oct 25, 2003 | 02:48 PM
  #4  
NVetro's Avatar
Thread Starter
Registered User
 
Joined: Jun 2003
Posts: 1,439
From: New Jersey
They are all corrected and everything i belive. It was on a dynojet
Old Oct 25, 2003 | 02:52 PM
  #5  
94formulabz's Avatar
Registered User
 
Joined: Apr 2003
Posts: 1,591
From: PA
Well the reason i said something is because the graph is labeled "actual hp". In WinPEP (the dynojet software) there are many options for what you graph. It appears that they Plotted the actual power output to the dyno and didn't apply the SAE-j or STD correction factors.

You'll need them if you want to accureately compare this baseline run to your future mods.
Old Oct 25, 2003 | 02:57 PM
  #6  
TQdrivenws6's Avatar
Registered User
 
Joined: Oct 2003
Posts: 1,454
From: MN/WI
Something is wrong with the graph. It is not possible for tq and hp to intercept anywhere other than at 5252rpm, and it crosses before that, more like at 4500rpm, so I would get that checked out.

HP = TQ*(RPM/5252)

So if you are at 5252rpms, HP = TQ thats just how it works.

Chris
Old Oct 25, 2003 | 03:58 PM
  #7  
NVetro's Avatar
Thread Starter
Registered User
 
Joined: Jun 2003
Posts: 1,439
From: New Jersey
thanks Slow95car. Yea the chart is alittle diffrent then most from what I see. The numbers are right, they are true and corrected for conditions from what the guy said. What I am curious about is how it getting ALITTLE choppy at higher rpms 4500+, anyone have any ideas? Is it to rich cus oif my new fuel pump?

Last edited by NVetro; Oct 25, 2003 at 04:05 PM.
Old Oct 25, 2003 | 04:06 PM
  #8  
Sanger's Avatar
Registered User
 
Joined: Jan 2001
Posts: 177
From: Morgan Hill, California, US
Was your 101.80 trap speed with the current mods you dynoed with as well?
Old Oct 25, 2003 | 04:22 PM
  #9  
drewstealth's Avatar
Registered User
 
Joined: Mar 2003
Posts: 1,623
From: Fairfield, ca
Did you ask the guy for sure if they were corrected #'s? Because usually the graph says SAE or STd on it, if it had the correction. But either way your #'s look good. What mod did you notice the biggest difference with. Because my hp is close to yours but your tq is a lot higher then mine. I also have a catback.
Old Oct 25, 2003 | 04:33 PM
  #10  
TQdrivenws6's Avatar
Registered User
 
Joined: Oct 2003
Posts: 1,454
From: MN/WI
Hah! My bad, the numbers do look like they would cross there.

Chris
Old Oct 25, 2003 | 04:39 PM
  #11  
NVetro's Avatar
Thread Starter
Registered User
 
Joined: Jun 2003
Posts: 1,439
From: New Jersey
Yes the 101.8 was run with my mods in the sig, naturaly aspirated of course. As for my highe tq numbers, maybe that is due to my billet flywheel and stage 3 clutch. As for SAE numbers it turns out I am wrong as usual, lol. They are the actual numbers, here are the conditions during the dyno, anyone have a calc?

Temp: 57 F
Dew: 57 F
Humidity: 69%
Pressure: 30.35 inches
Elevation: 43 feet
Location: Lodi, New Jersey

Can anyone calculate it for me please, I think it mite go down, not sure. Thanks.
Old Oct 25, 2003 | 05:44 PM
  #12  
NVetro's Avatar
Thread Starter
Registered User
 
Joined: Jun 2003
Posts: 1,439
From: New Jersey
anyone?
Old Oct 25, 2003 | 05:56 PM
  #13  
drewstealth's Avatar
Registered User
 
Joined: Mar 2003
Posts: 1,623
From: Fairfield, ca
Well i got 270rwph and 314rwtq. After a .954 correction factor.

Last edited by drewstealth; Oct 25, 2003 at 06:02 PM.
Old Oct 25, 2003 | 06:54 PM
  #14  
NVetro's Avatar
Thread Starter
Registered User
 
Joined: Jun 2003
Posts: 1,439
From: New Jersey
is that good for my mods?
Old Oct 25, 2003 | 07:10 PM
  #15  
94formulabz's Avatar
Registered User
 
Joined: Apr 2003
Posts: 1,591
From: PA
I got 268.8 SAE

Correction factor of 0.947343986
0.947343986=cf = 1.180*[(990/Pdry)(Tk/298)^.5]-.18

Pdry= P-Pwater69% = 1027.769-11.03=1016.739 millibar
Tk=286.8 Kelvin

Still good for your mods. Here is a dyno with similar mods.

Does Ion have your car tuned rich for the nitrous?

-brent

Last edited by 94formulabz; Oct 25, 2003 at 07:13 PM.



All times are GMT -5. The time now is 11:33 PM.