Chassis dyno results

[70sixpkrt]

I did a chassis dyno yesterday and here are the numbers. I had my engine dynoed on a stand about 2 yrs ago and the numbers were 491hp and 535 torque. It looks like I lost about 18% thru the drivetrain. On the chassis dyno I made 398.8hp and 447.8 torque.

[r_biccum]

  wow nice numbers!

[70sixpkrt]

I know I am running rich. Should I play with the mixture screws or jets or do both?

[firefighter3931]

I know I am running rich. Should I play with the mixture screws or jets or do both?

Ricky, the mixture is for idle adjustment; once you're past the idle circuit (1100 rpm) the main circuit kicks in....jetting is for wide open throttle. The power numbers look real good but will improve once you lean out the A/F numbers....especially lower in the powerband. I would probably start with adjusting the outboard carbs. 



Ron

[70sixpkrt]

I would probably start with adjusting the outboard carbs. 

Ron should I play with the mixture screws or jets first?

[maxwellwedge]

For the outboards you are going to have to play with the metering plates....unless you have a modded setup with metering blocks on all 3 carbs.

[70sixpkrt]

I am running the Promax jettable plates for the outboard carbs. I am running 80 jets on a four corners and 65 in the center carb. The mixture screws are 1 turn out on the center carb and 1/2 turn out on the outboard carbs.

[maxwellwedge]

Good numbers indeed! Cool stuff - It wouldn't hurt going down two sizes and trying it out on the end carbs for now - check, and then try the same on the center.

[firefighter3931]

I would probably start with adjusting the outboard carbs. 

Ron should I play with the mixture screws or jets first?

How is the idle ? Smell rich ? If not leave it alone for now and jet down 2 sizes on the outboards as Jim suggested. 

A LM1 with a wideband o2 sensor would come in handy right about now. 


Ron

[70sixpkrt]

How is the idle ? Smell rich ? If not leave it alone for now and jet down 2 sizes on the outboards as Jim suggested. 

A LM1 with a wideband o2 sensor would come in handy right about now. 

The idle doesn't smell too bad. Maybe smells a tad rich. Funny thing that you mention LM-1. I am thinking about buying one. How can I use 2 bung sensors with it? I want to be able to check a/f ratio on both sides at the same time.

[70daytonaclone]

just like to say that yellow charger is now on my desk top! I sure do like reading about a really nice Charger. Out living the racers dream! I'm going to install a 4:10 in my 70r/t and give it a go! Great site !!!