73 Comet Dyno Sheet

Earlier in the month I went to a Dyno Day sponsored by my husband's car club (SoCal SVTOA).

121hp not too bad for my 302. Although its was nothing compared to the 300+ hp that the Cobra's were showing.

 

121 hp for a 302?

wow... that must be a real mild build on that... the torque is pretty high for a low HP...

 

Something is weird with that scale. I'm sure the hp & torque figures are right but that mph scale has me confused. 130 mph??

 

WIsh I had a place where I could do that on my car. Get some real numbers, and no more of this 250-ish or 300-ish HP crap I am always throwing around. I would like to see some torque numbers also.

I use how much I beat the 04 mustang at the track as my estimated HP, but his is not stock, either, and this is not a good estimate. No idea on torque.

 

were they grading you on a curve

 

Factory 73 Maverick/Comet 302's are supposed to be 140-145 HP. Wonder why your geting a dyno rating of 121 HP

 

That sounds about right for a 30 year old motor... probably more than my 77 was still putting out before I replaced it.

The scale is wierd, why not RPM? But without wind drag, I can see where 130mph would be feasible with a 2.79 gear.

 

The engine was rebuilt by the previous owner, about 20000 miles ago, to stock, I think. We have added an MSD Billet Distributor and blaster coil. That's it, except for my chrome Edlebrock air cleaner (I bet that adds at least 10 HP ).

I don't know why the tuner set the scale to MPH, it showed a tach on the computer when he ran the dyno, it was a Mustang dyno. I did see that during the two runs, he let off at about 5000 rpm. My husband's friend had his autoshop class's 72 Maverick on a dyno and it put out 76 HP at the tire (100K mile stock engine).

The hp at the tire is 15-20% less than the hp at the flywheel (net factory rating) to account for drivetrain losses.

 

Yes, I already knew that, I must have forgotten that the dynos numbers are coming from the rear wheels. heres how it is, before 1972 they had them rated at the flywheel with no accessories hooked up, then after 1972 they started rating with with a Net rating which is at the back of the transmission.

Stock Maverick/Comet 302's HP Ratings.

Fly Wheel HP Rating 210.

Net HP Rating 140.

Rear Wheels 120-125, number coming from your dyno information.

 

I think net power is still at the flywheel. That's how we were measuring 3 years ago. All the accessories were still hooked up though.

 

It never ceases to amaze me how much higher people estimate their power to be. No slam to anyone, I just think we'll all a little over optimistic. An honest 300 fly wheel hp in a little car like a maverick (2700ish lbs) should put you in the mid to high 12s at 110 + MPH. That's with a decent 2.0-2.5 60' time.

 

Net is at the rear of the tranny with all accessories on and running for the time frame of our vehicles, I don't know where they measure now. I know Ford, as of late, advertises flywheel hp, Chevy advertises to the ground, sometimes conservatively on the Vettes and such.

 

From what I understand pre 72s are gross (no exhaust tuned carb & timing no acessories at the flywheel) post 72 are net ( with exhaust manifolds factory setting on carb & timing, water pump and the alternator hooked up at the flywheel)

I have never heard of post 72s measured at the trans. That being said her car makes 142-161 not bad.

BTW Tammy's car made 295 Hp and 295 Tq at the rear wheels

 

answer to SAE horsepower vs..... blah blah blah

http://www.washtimes.com/autoweekend/20031203-113912-8358r.htm

 

Thats pretty close. Mine dyno'd at 303 rwh. Car weighs 3200 with me in it and a full tank. Best so far is a 12.98 with 2.1 60 ft. Traction is non existant with my 4 spd. Spins in first 3 gears. I think it could easily be mid 12's with the right traction.