Joined: Sat Apr 29 2006, 05:11PM
Location: Cincy
Posts: 269
I agree on the carb - - the engine should flow decent air and a larger carb can help. But the smaller carb helps get the car moving.
1.73 60 ft is not too good for that much torque/hp.
MP guidelines are just that - - guidelines. There is more than one way to skin a cat.
I can only speak of my experience. Running a 11.6:1 compression (actual), stock bottom end, .590 cam, M1 intake, ported 906 heads my motor made around 540 hp.
My 540 hp in a 3450 lb car went 10.81 @ 121.5 mph with a decent suspension and good converter. In a 3800 lb car the motor would of went around 11.16. At 547 hp, a 3800 lb car should go 11.16.
I do not have a good hp calculator for mph, but the ET calculator is pretty good.
Joined: Sun Oct 09 2005, 05:02PM
Location: ALLEN PARK, MI.
Posts: 2007
Whew! I can't wait for Dana to chime in here! So your basicly saying that Dana's and my engines ARE NOT running about mid 500's on BHP? Hmmm.....interesting!
A 550 +/- engine in a 3400 lbs +/- car running in the high 10's with just good suspension and converter and NO NoS? Boy! I'd like to see that one!
By the way, a 1.72/3 60' is not good? Boy, do you have high standards! Learn somtin' new every day! Tony P.
Joined: Sat Apr 29 2006, 05:11PM
Location: Cincy
Posts: 269
wrote ... By the way, a 1.72/3 60' is not good?
Let me clarify........... 1.72 is not good for 547 hp engine in a car with a decent suspension and slicks.
wrote ... So your basicly saying that Dana's and my engines ARE NOT running about mid 500's on BHP? Hmmm.....interesting!
I think your cars run great! I can only tell you my experience. 3450 lbs with a 11.6:1 compression 906 headed 440. This motor was nothing special, but the combo worked okay. It did not make 550 hp - - on a DynoJet chassis dyno, it made around 410 - 420 hp.
It also depends on the Torque converter,just because it is a 9" 4000 stall piece does not tell the whole story,as this converter may be one of those saturday night specials.I will say that if it is one of those and you swap in a pro "Coan" converter or equivilent, it will drop that 0-60 time.1.72/73 ain't too bad for a stock heavy car,no matter how much power you got.Throw in a cage and tie the frame together,alum. driveshaft and lightweight wheels.That alone will drop it in the mid 1.60 range,if everything else is optimised.Stock class racers spend big $ to get the cars to hook in this range.There is a lot of variables here.Glen
Joined: Mon Oct 10 2005, 01:49PM
Location: Grand Rapids, MI
Posts: 421
Well what to say...hehe
Those online calculators/Moroso slide calculator, they can get you close, but imo when your running C's at the weight we are they arn't all that accurate imo.
We're saddled with a bunch of extra weight all the while trying to push a barn door thru the air at the top end.
His combo is off on a few things things imo.
Not enough compression and cam for the heads he's using, with too little gear. Carb could be bigger but its not killn the combo. And personally I'd be shifting that Yeep a whole lot higher...
As for me, I am running a saturday night special converter, can u say 13%+ slip, and will be the first thing that changed with my combo.
I'm goin up on the cam, thinking 557 MP, 9.5" Dynamic, and since both my Hoosiers and BFG's are done, just gonna go with a one tire deal, I'm getting old and lazy and sick of swapping Yeep around , gonna go with a 275/60/15 MT DR's.
Joined: Sun Oct 09 2005, 05:02PM
Location: ALLEN PARK, MI.
Posts: 2007
Well, I am running one of the best Mopar converters on the market.....Turbo Action! I do NOT think I'm slipping a high percent! I have a chart where you line up weight with ending MPH in the 1/4 which tells you BHP. It showed my engine above 500 BHP. I may not be at 550 on the nose, but I am up there! Maybe I should have spent the extra $500 to get the engine dyno'ed!
Yes, pushing a BRICK thru the air...indeed! Tony P.
Joined: Sun Oct 09 2005, 05:02PM
Location: ALLEN PARK, MI.
Posts: 2007
Dana has frame ties and lite weight wheels. He is "part" there! He also is using Cal-Tracs. With 9" slicks, he is running well! He has had time to tune his engine at the track. If he was going to cut 1.6 60', I think he would have hit that by now. His converter is the ONLY thing holding him back now! Tony P.
Joined: Sat Apr 29 2006, 05:11PM
Location: Cincy
Posts: 269
You folks do bring up some good points. Didn't say if car had a cage - - without a cage car may be flexing and that could be hurting 60 ft. But even with a better 60 ft car is still not running the ET's of a 547 hp car.
This car is no more of a brick than my car. I do however agree that the C's are a bit more of a brick, and that can skew the hp calculation some.
I use the formula out of the old Direct Connection catalog. I find it pretty accurate.
Joined: Sun Oct 09 2005, 05:02PM
Location: ALLEN PARK, MI.
Posts: 2007
Bode, using that formula on my 66' and then my old 68', I have to come to the conclusion that it must be for REAR WHEEL BHP! There is just NO WAY my engine is at 438 BHP! The way my engine is built, that is WAY TO LOW for my 431 stroker at the flywheel!
That guy with the 470 must be puss shifting that stroker! I shift at 6500 RPM's and I still can go above that with no "feel" of power loss or float! Muscle Motors may not be gods, but their reputation is world wide known! If they say ABOUT 550 bhp......I feel I can believe it! There is just no way a 4,000 lbs car is going low 12's without over 500 bhp! If it is true, show me the cars! Tony P.
Joined: Sat Apr 29 2006, 05:11PM
Location: Cincy
Posts: 269
wrote ... Bode, using that formula on my 66' and then my old 68', I have to come to the conclusion that it must be for REAR WHEEL BHP! There is just NO WAY my engine is at 438 BHP! The way my engine is built, that is WAY TO LOW for my 431 stroker at the flywheel!!
That is for flywheel hp, and is about right for my car. Shows 540 hp for my engine, and the chassis dyno came in at 410 - 420 hp. The difference is about right. No way that a pretty basic 906 headed motor is making much over 550 hp.
The formula works well for a decent suspension car that hooks reasonably well. May be a little skewed for your car, and may be reporting a little low.