I have a date Jan. 19....

[1974dodgecharger]

with a dyno machine lol!!!!  I hope my 383 gives me 300 to 350HP that day since she built we predicted 400 to 450 to the fly based on the products we picked, but never dynoed her. 

Pual G will be there since I just joined the Arizona Mopar club so he can laugh at my pulls that day with the 4 speeder going at it.  CANT WAIT!!!!

no more guessing or predicting my HP/TQ anymore!

[Bob T]

Good, something to look forward to for sure. I did mine yesterday, glad I did it too, finally sorted some issues with it, there's a thread up in engine /performance and a link to a clip, man it sounded good  
Ended up with 281rwhp 353 torque


http://www.dodgecharger.com/forum/index.php/topic,107245.0.html

[1974dodgecharger]

just saw that bob and listened to the youtube video WOW!!!  Cant wait for mine..I never done one before so im pretty excited!!!!!

[Bob T]

just saw that bob and listened to the youtube video WOW!!!  Cant wait for mine..I never done one before so im pretty excited!!!!!

Yah, turn the speakers up!!!! 

The big thing was sorting out all the little niggles and getting the engine to make all the power it could ( conservatively ), nothing more annoying than knowing the car should run better but does'nt and a dyno is the only real time effect to dianostically tune with that a static tune cant, money well spent in my book.

Maybe it will even get better mileage  , probably not though, 'cause I'm mashing the pedal a lot more 

[tan top]

 

[fy469rtse]

Bob , what percentage do you think you lost through drive line, have done mine on a engine dyno, got impressive numbers, rest of drive line built the same, but I keep hearing its about 15% , do you think that's on the money

[resq302]

Back sometime around 2002 or so I had my 383 HP 4 bbl (factory rated at 335 hp) chasis dyno'd and the engine is a restoration cam, .30 over pistons, going through a 4 spd manual trans and at the time 3.23 gears in the rear.  I dyno'd 230 at the rear wheels which the guy said is about right.  Typically he said you lose about 100 hp through the drive train, especially with a manual gear box.

[Ghoste]

Shouldn't there be greater loss with an automatic?

[A383Wing]

yea....I have always heard greater loss with auto trans

[Bob T]

Bob , what percentage do you think you lost through drive line, have done mine on a engine dyno, got impressive numbers, rest of drive line built the same, but I keep hearing its about 15% , do you think that's on the money

I'd heard the 20% is likely ballpark for losses FY, but also its taking more hp loss to get past the further up the curve. Constant ratio losses? I'm not so sure now. On the printout I've got off the Dynojet Research machine, it shows at 5120 rpm the losses are 168hp, this is 40% of the 420 crank hp, a lot more than I would have guessed.

I reckon the losses could also be minimized a bit, for example, if I changed out my 15 x 10 295/50 magnums/bfg's to my buddys 15 x 8 aero alloys then straight away there is a rolling mass inertia saving, maybe harder tyre pressure as well.