so the engine isnt really putting out more power it is just that the manual will dyno higher at the rear wheels?

 

Yes, and yes. I think. If it is like any other Ford product that I have had any experience with. Two things working here. A stick tranny can take more HP than the auto generally speaking. It will also transmit more power to the rear wheels due to the lack of parasitic loss in a stock auto tranny which is slip slipping away.

Having said that, and looking at longevity issues, I believe the standard tranny models where programmed for the higher HP number via the PCM because they can handle it and there is no warranty issue.

So, I think it is all at the flywheel, and naturally a standard tranny can transmit more to the rear wheels, and therefore will dyno higher.

Same engine, different program.

 

In a manual transmission there is a direct link from the wheels to the crankshaft, a in and out clutch. On a automatic, the torque converter will always slip a tiny bit, even with a fully built transmission, as the "clutch" is a fluid coupling, and not an acutal hard in-out clutch.

 

Another data point - Our 2000 F250 Crew 4x4, at the rear wheels on a Mustang dyno, does 215hp. Don't remember the exact torque offhand, but for the emissions dyno you have to divide the number by your gear ratio to get it, 415tq or so. AFE Intake, high-flow muffler - no chip or other mods.

Sounds high for no chip I think - but I know numbers can vary quite a bit between dynos.

thanks, jon.

 

Thats what I've been taught as well. Does that not also apply to torque numbers as well?

I talk to a lot of people in the RV/Camper towing circles, who have various makes/models of tow vehicle, and they always get upset with me when I bring that up (effectively decreasing how strong they say their trucks are).

 

thats exactly why i was wondering if the #'s were rwhp or @ the crank.
an auto tranny has much more parasitic power loss than a manual.

 

ok, history shows the numbers given by the sticker means nothing at all. if you dyno 10 identicle trucks with identicle milage you will get about a 15% change across the board. with an auto you typically lose around 15% through the drivetrain (ie: converter loss) depends on how loose your converter is. with a stick you still lose about 10% percent. most vehicles in the performance catagory are under rated from the factory. i put a 2000 LS1 on an engine dyno stock trim made 348hp factory says 320. seen an 03 cobra dyno more than the book says on a chassie dyno, that means the factory underated the car by over 15%. no two cars or trucks are the same, if you are curious take yours to the local hot rod shop with a dyno and see what those tunes are really getting you


p.s. the numbers are always flywheel.