chassis dyno results

[oldschool]

I took my last 500" motor build to the chassis dyno today. I mainly wanted to see the fuel curve.  I have been messing around with my fuel curve trying to tune it with my LM-1.  My fuel curve looks good, the results are:
Max HP 590
Max torque 568.31
That was without the air cleaner.  With the air cleaner:
584.83
558.28
I don't know why it lost 10 ft lbs of torque going without the air cleaner.  
Recap of the motor build:
500"
Indy SR 295 CNC
Solid Roller
272/276 @ .050"  .610"
Mopar 337 Manifold with 1000 CFM 4150
12.75 CR
On the engine dyno it made 708 hp

[tan top]

 

[oldschool]

I'm trying to post a better image.

[oldschool]

this is the car dynoed, the green one...

[BBKNARF]

NICE  now put slicks on it and go to the track 

[oldschool]

NICE  now put slicks on it and go to the track 

i would LOVE too. i dont think they will let me run though . what do you guys think it would run? i had it weighed, it was 3650 with out me in it. 3.55 posi, 4 speed, 255/60 drag radials.

[lasvegas69charg]

that's pretty awesome having 700+ HP on the motor. I bet she moves.  Is it street drivable?

[firefighter3931]

Those are good numbers Brian but it does look a little lean up top....assuming those a/f readings are correct. The top end flutter past 5k rpm seems to bear this out. 

It probably needs more jet but the power number looks great 

If you could get it to hook and launch i would think it's an easy mid 10 sec combo 


Ron

[oldschool]

hey ron. i dont know what was up with the dyno.the first couple of runs, it would not get a good sample. he had to mess with it to get it to read a complete run. also the first af ratio, was way off too. it read 14.7-15.5. i knew it was wrong because i have been tuning with my lm-1. my results were:
idle 14.5-15.0
cruise 13.8-14.2
wot 12.5-12.7

i had him change the sensor, and it read alittle high also. i have 3 of the same combo,s and they all use about the same jetting. i think if it was that lean, it would ping like crazy and not make the power it did. like i said the car drives perfect. as far as hooking up, i dont think it ever will with 255/60 tires. now i can be going about 50 mph, downshift to third and nail it. the tires will spin so much that it will wheel hop........still alot of fun thou.
i have had funky dyno readings before. this was my charger with the 580" motor. this is a different dynojet.

[firefighter3931]

I knew it was wrong because i have been tuning with my lm-1.

My results were:
-idle 14.5-15.0
-cruise 13.8-14.2
-wot 12.5-12.7

Those are excellent numbers....can't ask for anything better. Nice job on that Carb ! 

I have more faith in the LM1 than any chassis dyno. Seen lots that had "odd" A/F readouts like yours yet the car seemingly runs fine ?  Sometimes i wonder about tire slippage on the drum and how that affects the results ? 

At any rate, the motor is making the power it should be based on the engine dyno results so you should be happy....i would be 



Ron