Guess my dyno numbers (RESULTS ARE IN)

7173Mustangs.com

Help Support 7173Mustangs.com:

Joined
Jan 1, 2012
Messages
8,261
Reaction score
1,010
Location
Eugene, OR
My Car
1971 Mustang Sportroof M code
That should give you a static compression ratio of about 10.3 to 1 and a dynamic C.R. In the 7.8 to 1 to 8.2 to 1 range, depending on the cam specs. Should run great.

 
Joined
Dec 11, 2015
Messages
626
Reaction score
105
Location
Philadelphia
My Car
73 Mach 1
That should give you a static compression ratio of about 10.3 to 1 and a dynamic C.R. In the 7.8 to 1 to 8.2 to 1 range, depending on the cam specs. Should run great.
Still hold to you original numbers? Also I noticed my oil pressure is pretty high I feel but I'm not sure if it's because it still has to break in? The pump is a m84ahv oil pump. I'm seeing about 75 cold at idle. Doesn't seem to go down much warm. Haven't driven it enough to pay attention to cruising. 

 

boilermaster

Well-known member
Joined
Feb 19, 2015
Messages
505
Reaction score
119
Location
michigan
My Car
71 fastback
73 mach1lots of room for speculation here, for me its all about whos dyno, who is operating the dyno and how much loss from engine to tires.                                                                                                 

I have a similar 408 with very similar camshaft but closed chambers and 10.6 static and 8.1 dynamic.

on software 1 am anywhere from 500 to 520 hp. at the crank, its all in the translation.

where did you have emi/rfi on your sniper?, I have installed a few of these units on gm cars and have not encountered any of this as of yet, i did install the secret emi tape and redundant grounds before installs and thats what I am crediting my sucess to.

 
Joined
Dec 11, 2015
Messages
626
Reaction score
105
Location
Philadelphia
My Car
73 Mach 1
73 mach1lots of room for speculation here, for me its all about whos dyno, who is operating the dyno and how much loss from engine to tires.                                                                                                 

I have a similar 408 with very similar camshaft but closed chambers and 10.6 static and 8.1 dynamic.

on software 1 am anywhere from 500 to 520 hp. at the crank, its all in the translation.

where did you have emi/rfi on your sniper?, I have installed a few of these units on gm cars and have not encountered any of this as of yet, i did install the secret emi tape and redundant grounds before installs and thats what I am crediting my sucess to.
GM probably have more success due to the fact that the dizzy is in the rear opposite the ecu. I believe it was coming off the dizzy and my metal air cleaner and stud were acting like an antenna. I also rerouted my Sniper power wires opposite side of my sensor wires. I took the orange and black coil wires and twisted them and cut off about 2ft of non needed wire. Some of my grounds are redundant but they are clean and out of sight so it's more preventative. 

 

midlife

Shorts checker
Joined
Jan 24, 2012
Messages
4,293
Reaction score
894
Location
Tucson, AZ
My Car
No Mustangs at the moment.
My prediction is that there's more power than the dyno can handle; thus the dyno will break long before you're able to get a good reading of HP and torque.  *G*

 

giantpune

Well-known member
Joined
May 1, 2021
Messages
458
Reaction score
353
Location
GA
73 mach1lots of room for speculation here, for me its all about whos dyno, who is operating the dyno and how much loss from engine to tires. 
Yep, the numbers the thing puts out are very dependent on the type of dyno it is and the person running it.  The numbers can be affected by the operator and their technique, whether on purpose or on accident.  

Here's one example of a bone stock car, taken to a handful of different shops and getting a 10% fluctuation in HP numbers.  Still a fun guessing game to play.  
hrdp_0405_16_z-chassis_dyno_guide-.jpg


 
Joined
Dec 11, 2015
Messages
626
Reaction score
105
Location
Philadelphia
My Car
73 Mach 1
Yep, the numbers the thing puts out are very dependent on the type of dyno it is and the person running it.  The numbers can be affected by the operator and their technique, whether on purpose or on accident.  

Here's one example of a bone stock car, taken to a handful of different shops and getting a 10% fluctuation in HP numbers.  Still a fun guessing game to play.  
Not 100% sure on the type of dyno being used at this time. Guy was suggested from someone I trust. Should be interesting. 

 

giantpune

Well-known member
Joined
May 1, 2021
Messages
458
Reaction score
353
Location
GA
Is this like the jellybean game or the price is right showcase?  Whoever guesses closest without going over wins the car?

 
Joined
Dec 11, 2015
Messages
626
Reaction score
105
Location
Philadelphia
My Car
73 Mach 1
Well... well... so I'm not trying to be cryptic here but my guy only had one number to give me. He has the car and I'm waiting for the torque numbers. Apparently my buddy only cared about the RWHP. I can only guess she made more in torque? Anyway...she made 417RWHP! To say I'm happy is an understatement. Stock 4v open irons did pretty damn good on this motor. Soon as I get Tq numbers I'll report back.

 

Lazarus

Well-known member
Joined
Mar 19, 2019
Messages
293
Reaction score
186
Location
NC
My Car
1973 Mustang Convertible 302
1972 Mustang Convertible 351-2V/TKO600
Official numbers are 418rwhp and 437rwtq. Very happy with that. I'll post the sheet as soon as I get it.
That’s really great man!  Congratulations; you must be pretty pumped!

 

midlife

Shorts checker
Joined
Jan 24, 2012
Messages
4,293
Reaction score
894
Location
Tucson, AZ
My Car
No Mustangs at the moment.
Bah!  Your mechanic is lying to you, as your car broke his dyno and he doesn't want to admit it.  That means I win!  *G*

Good numbers, but what are the revs for each?

 
Top