Dyno pull feedback
#697611
05/14/10 08:19 AM
05/14/10 08:19 AM
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Joined: Jul 2004
Posts: 4,732
Watertown, WI
MikeyT
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Watertown, WI
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Hi all I just wanted to get your feedback on my build and give me some pointers on where I should go from here. This was my first trip to the dyno, so I didn't know what to expect. First off here is the mill 440 bored .40 over total cubic inches are 448 set of stock aluminum 440 source heads 1.5 stock rockers comp xtreme cam XE268H 480 lift .050 224degree/230 degree Holley Street Dominator intake headman shorty headers 1 3/4" at 2/5 inch collectors 800 cfm Thunderseries edlebrock carburator Jetted up 2 sizes 3860 lbs with me in it.  hp 304 and torgue at 416. A couple of nice things about the graph. I have a very nice broad power band it arches well between 4600 and 5400 rpms. As is a rule my 440 is a torque monster. It seems to make my Converter flash about 3300. The torque band is pretty impressive and remained high through the whole run. Now we are going to continue to work on this a bit. The guy who runs the dyno has a father who is a carter expert and he is going to look at it as well as take some time to adjust timing with it and we will do it again. For the most part, I was hoping for more, but am satisfied for what the engine is, which is a mildly built big block car. Mike
1969 Dodge Dart Swinger
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Re: Dyno pull feedback
[Re: MikeyT]
#697613
05/14/10 11:50 AM
05/14/10 11:50 AM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
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oops  it's an automatic . You have what appears to me to be about 100hp of drivetrain loss . What work was done to the heads , if any ?
Last edited by JohnRR; 05/14/10 11:52 AM.
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Re: Dyno pull feedback
[Re: JohnRR]
#697614
05/14/10 07:25 PM
05/14/10 07:25 PM
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Joined: Jul 2004
Posts: 4,732
Watertown, WI
MikeyT
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no work done to the heads, out of box put them on the car. 100 hp loss of the auto (gasp) really?
Mike
1969 Dodge Dart Swinger
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Re: Dyno pull feedback
[Re: 1badx]
#697616
05/15/10 01:50 AM
05/15/10 01:50 AM
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Joined: Jul 2004
Posts: 4,732
Watertown, WI
MikeyT
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Thanks Mike for the perspective. My buddy Nate ran the set up and he has bee doing it for year so I think it was a good set up, my only question is weight, what if the car weighs a little bit more then the 3860 lbs listed?
Mike
1969 Dodge Dart Swinger
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Re: Dyno pull feedback
[Re: MikeyT]
#697619
05/15/10 08:15 AM
05/15/10 08:15 AM
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U.S.S.A.
JohnRR
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Quote:
Thanks Mike for the perspective. My buddy Nate ran the set up and he has bee doing it for year so I think it was a good set up, my only question is weight, what if the car weighs a little bit more then the 3860 lbs listed?
Mike
The dyno doesn't care how much the car weighs , weight only comes into play for dragstrip calculations.
Considering the heads were run out of the box I guess that's not a bad HP number .
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Re: Dyno pull feedback
[Re: BSB67]
#697620
05/15/10 10:36 AM
05/15/10 10:36 AM
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Joined: Jul 2004
Posts: 4,732
Watertown, WI
MikeyT
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Quote:
For what you have, I think those are good numbers. Did you have an et and mph goal?
My hope is to get solidly into the 12's. This might not happen, but last fall I had one run of 13.68 at around 105 mph, yet that was with 3:91 gears in it. This pull was done with the 3:23's in it.
However looiking at it, it seems like 3:91's are the best gear for me, because I would cross the traps at between 5400 and 5700 rpms.
The car fills like it might even like more jetting, it took the largest ones I had in the Eddy kit.
Yet, fuel seemed good most of my pulls put 02 at 12.5 and at top point 14.1 AFR with it averaging out to be 13.1 AFR across the whole run, so perhaps a little more tweaking is in order!@
Mike
PS for the record this engine performaed with the timing set at which is 16 initial and 36 total all in at 2800 rpms.
1969 Dodge Dart Swinger
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Re: Dyno pull feedback
[Re: MikeyT]
#697623
05/15/10 11:37 AM
05/15/10 11:37 AM
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Joined: Sep 2008
Posts: 2,840
Flint, Michigan
B1Fish540
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Quote:
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Is that the real un-corrected power numbers or the SAE corrected power numbers? Anyhow, it looks good considering how small the cam is for that combination.
LOL, I alwaysd thought it was a nice middle sized cam, I guess not!!  I'm not up on my dyno lingo,but I beleive uncorrected power numbers. I know it was 70 degrees out and not overly humid for the day, but I can't give you humidity stuff.
Mike
Mike
Mike another option would be to swap in some 1.6 ratio rockers ...that would give you over .500 lift w/your present cam. Better yet would be the .509 cam with 1.6 rockers for around .535 lift. Then , you would be letting those heads work and gain about 50 hp. 440s like to breath, thats why the Holley 850 db would be the "best" choice.
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Re: Dyno pull feedback
[Re: JohnRR]
#697624
05/15/10 02:26 PM
05/15/10 02:26 PM
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Joined: Apr 2007
Posts: 807
Toronto, Canada
dirtybee
super stock
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super stock
Joined: Apr 2007
Posts: 807
Toronto, Canada
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Quote:
Quote:
Thanks Mike for the perspective. My buddy Nate ran the set up and he has bee doing it for year so I think it was a good set up, my only question is weight, what if the car weighs a little bit more then the 3860 lbs listed?
Mike
The dyno doesn't care how much the car weighs , weight only comes into play for dragstrip calculations.
Considering the heads were run out of the box I guess that's not a bad HP number .
the one time i went on a chassis dyno the operator had to enter the vehicle weight  maybe some are different 
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Re: Dyno pull feedback
[Re: MikeyT]
#697625
05/15/10 06:08 PM
05/15/10 06:08 PM
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Joined: Feb 2005
Posts: 4,316
Prospect, PA
BSB67
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Quote:
Quote:
For what you have, I think those are good numbers. Did you have an et and mph goal?
My hope is to get solidly into the 12's. This might not happen, but last fall I had one run of 13.68 at around 105 mph, yet that was with 3:91 gears in it. This pull was done with the 3:23's in it.
However looiking at it, it seems like 3:91's are the best gear for me, because I would cross the traps at between 5400 and 5700 rpms.
The car fills like it might even like more jetting, it took the largest ones I had in the Eddy kit.
Yet, fuel seemed good most of my pulls put 02 at 12.5 and at top point 14.1 AFR with it averaging out to be 13.1 AFR across the whole run, so perhaps a little more tweaking is in order!@
Mike
PS for the record this engine performaed with the timing set at which is 16 initial and 36 total all in at 2800 rpms.
I guessed a little more mph with your RWHP and weight, but not much, like 107. Keep tuning, and practicing your launch and you could see high 12s in good air without changing anything else.
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Re: Dyno pull feedback
[Re: dirtybee]
#697627
05/15/10 07:04 PM
05/15/10 07:04 PM
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Joined: Sep 2006
Posts: 411
Portersville, Pa
1badx
mopar
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mopar
Joined: Sep 2006
Posts: 411
Portersville, Pa
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Quote:
Quote:
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Thanks Mike for the perspective. My buddy Nate ran the set up and he has bee doing it for year so I think it was a good set up, my only question is weight, what if the car weighs a little bit more then the 3860 lbs listed?
Mike
The dyno doesn't care how much the car weighs , weight only comes into play for dragstrip calculations.
Considering the heads were run out of the box I guess that's not a bad HP number .
the one time i went on a chassis dyno the operator had to enter the vehicle weight maybe some are different
Actually the weight does matter. On our Mustang dyno the more weight you add the more the dyno loads (or applies braking force) the car during a pull. Now if the question is how much will it affect your horsepower I'm not sure, it may not affect it at all or it may put the car in a load range it may never see. It doesn't look like the weight difference was substantial so I wouldn't loose sleep over it. We have doubled a cars weight to experiment with quicker boost rise and the total horsepower with correction factor did not vary that much.
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Re: Dyno pull feedback
[Re: 1badx]
#697628
05/16/10 11:31 AM
05/16/10 11:31 AM
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Joined: Jul 2004
Posts: 4,732
Watertown, WI
MikeyT
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Thanks everybody for input. I certainly appreciate it. Now, I want to look at tweaking things a bit. Mike PS no Rob, I'm not putting a 950 DB on my 440!  I like my taxicab carburator!
1969 Dodge Dart Swinger
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Re: Dyno pull feedback
[Re: dirtybee]
#697629
05/16/10 04:16 PM
05/16/10 04:16 PM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
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Joined: Jan 2003
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U.S.S.A.
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Quote:
Quote:
Quote:
Thanks Mike for the perspective. My buddy Nate ran the set up and he has bee doing it for year so I think it was a good set up, my only question is weight, what if the car weighs a little bit more then the 3860 lbs listed?
Mike
The dyno doesn't care how much the car weighs , weight only comes into play for dragstrip calculations.
Considering the heads were run out of the box I guess that's not a bad HP number .
the one time i went on a chassis dyno the operator had to enter the vehicle weight maybe some are different
can't remember being asked that and I've been on superflow and a mustang ...
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Re: Dyno pull feedback
[Re: 1badx]
#697630
05/16/10 04:19 PM
05/16/10 04:19 PM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Quote:
Quote:
Quote:
Quote:
Thanks Mike for the perspective. My buddy Nate ran the set up and he has bee doing it for year so I think it was a good set up, my only question is weight, what if the car weighs a little bit more then the 3860 lbs listed?
Mike
The dyno doesn't care how much the car weighs , weight only comes into play for dragstrip calculations.
Considering the heads were run out of the box I guess that's not a bad HP number .
the one time i went on a chassis dyno the operator had to enter the vehicle weight maybe some are different
Actually the weight does matter. On our Mustang dyno the more weight you add the more the dyno loads (or applies braking force) the car during a pull. Now if the question is how much will it affect your horsepower I'm not sure, it may not affect it at all or it may put the car in a load range it may never see. It doesn't look like the weight difference was substantial so I wouldn't loose sleep over it. We have doubled a cars weight to experiment with quicker boost rise and the total horsepower with correction factor did not vary that much.
I did a dyno shootout in CT on a superflow, i think , and there was a guy with a dually that took off his outer rims to see if he could get a higher number because he was upset thata the big name shop that his truck was the test mule for was bested by some low life ... me ...
Maybe the dyno operator didn't know what he was doing ?
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