Goin to the chassis dyno tomarrow
Oh yea I forgot to mention that it is an automatic with a 2500 rpm stall with a pure evil tranny. The guy did mention that it seemed to be running a bit rich but within tolerance. Any idea how to lean it out just a bit?
If you trust the stock hp numbers and your dyno results (assuming 20% drivetrain loss) you're only about 5 hp / 15 ft/lbs above stock.
Am i reading that right? I'm sure your mods would have gotten more bang for the buck than that.
Am i reading that right? I'm sure your mods would have gotten more bang for the buck than that.
Well there are some things that dont get shown on a dyno. For instance throttle response, mpg, stuff like that. Also, I believe the rating in 1996 for these motors was 235 hp. I dont know if they were going off of crank or rwhp. I dont know how accurate they were back then. I am sure someone else could help on that one. All in all though I am not too disapointed, and again this is a starting point. I have a friend with an 04 ford f250 and he made about 193hp and 260 lbs torque. The owner of the dyno stated thats about what his 06 mustang GT made, and his wifes 07 1500 Ram with 5.7 made 300 hp on the dyno. So taking into account age, miles and such, I am really not unhappy.
The numbers sound reasonable for a 5.9 V8 with headers and a less restrictive exhaust.
I can't really read the attachment image's air to fuel ratio line at all,
even zooming 200%,
so if you could type those in or post a finer resolution JPEG image that would help.
An easy trick to lean the air to fuel ratio is to add some E85 fuel.
For a rough comparison to stock 5.9V8 output
here are two different pdf files of rear wheel dyno runs
where the blue line in the Hypertech shows about
189 hp to the rear wheels at 4000 rpm
http://www.hypertech-inc.com/media/d...odge%2059l.pdf
and the red line in the Kenne Bell graph shows about 204 hp stock if you smooth the result around 4000 rpm
http://www.kennebell.net/techinfo/do...-test-data.pdf
because rear wheel dynos are sensitive to
* the rear tires used and their air pressure,
*how much downward tension the dyno operator puts on the straps on the rear of the truck
* the temperature of the air blowing over the engine compartment and air inlet
* the temperature of the ATF, engine oil and coolant
* whether an auto trans is in 2nd or 3rd gear, or whether the tcc locks during the run
it is not unusual for one rear wheel dyno to read 189
and another to read 204 hp to the drum
now that you have a rear wheel dyno measurement
you might go out and try this estimator of hp and torque on a 'real world' road
http://www.bgsoflex.com/dyno.html
for your 1996 Ram the Cd of Drag will be about 0.47 and the frontal area about 34.5 square feet if it does not have a suspension lift. The other things you can measure.
I can't really read the attachment image's air to fuel ratio line at all,
even zooming 200%,
so if you could type those in or post a finer resolution JPEG image that would help.
An easy trick to lean the air to fuel ratio is to add some E85 fuel.
For a rough comparison to stock 5.9V8 output
here are two different pdf files of rear wheel dyno runs
where the blue line in the Hypertech shows about
189 hp to the rear wheels at 4000 rpm
http://www.hypertech-inc.com/media/d...odge%2059l.pdf
and the red line in the Kenne Bell graph shows about 204 hp stock if you smooth the result around 4000 rpm
http://www.kennebell.net/techinfo/do...-test-data.pdf
because rear wheel dynos are sensitive to
* the rear tires used and their air pressure,
*how much downward tension the dyno operator puts on the straps on the rear of the truck
* the temperature of the air blowing over the engine compartment and air inlet
* the temperature of the ATF, engine oil and coolant
* whether an auto trans is in 2nd or 3rd gear, or whether the tcc locks during the run
it is not unusual for one rear wheel dyno to read 189
and another to read 204 hp to the drum
now that you have a rear wheel dyno measurement
you might go out and try this estimator of hp and torque on a 'real world' road
http://www.bgsoflex.com/dyno.html
for your 1996 Ram the Cd of Drag will be about 0.47 and the frontal area about 34.5 square feet if it does not have a suspension lift. The other things you can measure.
Well as promised, I finally got back to the chassis dyno after putting the jet stage 2 chip back in. It took a little longer than I wanted but I have been crazy busy with work. I am working on scanning my print off. I have moved recently and misplaced my printer cable. But here are the numbers anyways. Again the only change this time was the Jet Stage 2 chip and running 93 octane. It has been about 6 months and 4000 miles so the computer should have had plenty of time to re-learn
Without chip HP: 200.26 TQ: 277.28
With chip HP: 207.35 TQ: 276.17
So there ya go. I will probably take it out and possible get the SCT.
Without chip HP: 200.26 TQ: 277.28
With chip HP: 207.35 TQ: 276.17
So there ya go. I will probably take it out and possible get the SCT.



