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-   -   "Official Rear Wheel Horse Power Thread" ? (http://www.clubcobra.com/forums/all-cobra-talk/116136-official-rear-wheel-horse-power-thread.html)

Jeff Frigo 06-23-2012 06:32 PM
"Official Rear Wheel Horse Power Thread" ?
 
I did many searches and didn't find any good threads, so maybe this can be the "Official RWHP Thread". Ok guys post them if you got them. No, should be, will be, I hope numbers. No calculated numbers either. Only post numbers if you have had your car on a chassis dyno. Please give as many details as possible.

OK I will start, 427 FE with a 428 crank, solid lifter cam, made 465 rwhp @6,100 rpm, and 475 rwtq @4,250 rpm. This was done on a Dynojet machine at LRS Performance in Lake Villa IL today. Talk to Larry, very reasonable, and knows carburetors inside and out.

G-Pete 06-24-2012 09:13 AM
Thanks Jeff for starting that.
If you guys post your dyno results, please give as much as possible info on the drive train.
AND post the dyno sheets!!! Not only the peak HP and TQ - would be nice too see how did you get there...

THX!

Jeff Frigo 06-24-2012 11:19 AM
Pete:

Top loader with 3.73 gear and a Jag rear end. Started out far to lean, 15 to 1 and too much timing, best number of the day!! Pulled 5 degrees of timing out to get to a final of 32 degrees over a few pulls, richened up the primaries by 2 sizes and the secondaries by 4. Lost a total of 2 hp, with a much safer tune.

mpanten 06-24-2012 01:45 PM
427 small block, aluminum dart block, afr 205 heads, a worked over holley 850 with a victor junior netted me 420 at the wheels with a aftr or 12.1. It was a 97 degree extreamily humid day on a dyno dynamics dyno. Im told it would have read 475 on a mustang dyno. Id like to try it again to see what it actually reads on another dyno but im stuck with the official 420. Cant remeber the tq.

Other info:
Trans-tremec 3550
Rear 3.27
headers canfield 1 7/8

undy 06-24-2012 02:25 PM
Keith Craft, Pond 482" SO, stage II Eboks and a mild Hydraulic Roller. Tunnel Wedge intake w/2 of Barry's Quick Fuel 750s... 474 RWHP

What a gutless turd...:rolleyes:

itstock 06-24-2012 03:15 PM
Quote:
Originally Posted by mpanten (Post 1197235)
427 small block, aluminum dart block, afr 205 heads, a worked over holley 850 with a victor junior netted me 420 at the wheels with a aftr or 12.1. It was a 97 degree extreamily humid day on a dyno dynamics dyno. Im told it would have read 475 on a mustang dyno. Id like to try it again to see what it actually reads on another dyno but im stuck with the official 420. Cant remeber the tq.

Other info:
Trans-tremec 3550
Rear 3.27
headers canfield 1 7/8
For accuracy sake of this thread, are you sure you don't have the dyno's mixed up? Or did they use an odd correction on the dynojet? Typically, a mustang dyno reads roughly 10% lower in my experience, but almost universally, it will read lower based on different variables because it is a loaded dyno.

Jeff Frigo 06-24-2012 04:26 PM
Sorry guys, 950 HP Holley carb. 80 in the primaries, 82 in the secondaries. 88 degrees outside. The most important detail is the SIDEPIPES. 3-1/2" Howe's.

Jeff Frigo 06-24-2012 04:29 PM
Quote:
Originally Posted by undy (Post 1197240)
Keith Craft, Pond 482" SO, stage II Eboks and a mild Hydraulic Roller. Tunnel Wedge intake w/2 of Barry's Quick Fuel 750s... 474 RWHP

What a gutless turd...:rolleyes:

Exhaust exhaust, exhsust.:o:o:o My neighbors love me.:CRY::CRY::CRY:

fordracing65 06-24-2012 04:49 PM
Dynos lie.

mpanten 06-24-2012 05:10 PM
Quote:
Originally Posted by itstock (Post 1197245)
For accuracy sake of this thread, are you sure you don't have the dyno's mixed up? Or did they use an odd correction on the dynojet? Typically, a mustang dyno reads roughly 10% lower in my experience, but almost universally, it will read lower based on different variables because it is a loaded dyno.
I believe you are correct on which one reads lower, but it was a dyno dynamics dyno, not a mustang or dyno jet.

Jeff Frigo 06-24-2012 06:22 PM
Quote:
Originally Posted by fordracing65 (Post 1197255)
Dynos lie.
Dyno's can lie. I will post some 1/4 mile times in a couple of weeks, they don't lie. Dyno's are a tuning tool and should be used to dial a car in not to get in a HP war.

Jeff Frigo 06-24-2012 06:25 PM
By the way, my car pulls clean in 4th gear ( I know its not good on the crank) from 1,000 rpm until the 6,500 pill kicks in. :):):):

itstock 06-24-2012 06:26 PM
Quote:
Originally Posted by mpanten (Post 1197259)
I believe you are correct on which one reads lower, but it was a dyno dynamics dyno, not a mustang or dyno jet.
I'm not sure how I missed that part, but based on certain variables, the dyno dynamics read extremely close to the mustang dyno. On a Dynojet, the guestimated number could be believable, but really, it's not worth even guessing.

Either way, I'd be more interested to see what some of your cars trap in the 1/4 with these dyno numbers.

G-Pete 06-24-2012 07:23 PM
Quote:
Originally Posted by fordracing65 (Post 1197255)
Dynos lie.
...like torque wrenches - right?:rolleyes::LOL:

John Owen 06-24-2012 11:39 PM
OK - 1130 crank hp with an all natural BOSS 9 hemi from Kaase. Great fun at a track but not so much on the street. 553 rwhp for my street Cobra on a Dynojet - 521 with tame solid roller.


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