I was curious to know what kind of horespower these trucks need to dish out to run 11's. Without the bottle. Anyone running 11's with no bottle ever get dynoed? Friend of mine thinks 600 at the wheels and over 700 at the flywheel. What do you guys think??

 

I think the non-nos folks running (high) 11's here are nowhere near running 600rwhp, more like mid 400 rwhp range, if that.

 

Well, probie I am new to this board but maybe I can be of limited assistance. If you go by the many horsepower calculators on the net, in order to run 11.65 in a 4800 lb vehicle, you need 560 horsepower at the wheels. This translates (through 20% drivetrain loss) to over 700 at the flywheel. I am of course assuming no weight reduction on the truck and approximately 200lb driver. Keep in mind that this 11.65 is calculated for a perfect launch and track conditions....so maybe its more...maybe its less. Either way I think you are looking at at least 670 horse at the flywheel to run consistant 11's

Feel free to flame away, I am not claiming to be an expert by any means


Joe

edit: bad math...doh!

 

Its not only a Horsepower thing, its also the trans, tires, and weight reduction. Track conditions play a huge part and so does the wether.

If you want to get a good Idea, of what it will take to do that then just model your truck after JL's.

He's without a doubt the fastest non NOS truck out there with the stock motor, Heads, Pistons, Rods, Basically no motor work... Mostly bolt ons and CAN WE ALL SAY IT TOGETHER, JL gutting! (weight reduction)

I wouldl honestly say with a light truck and great conditions 450 rearwheel hp should do 11's everytime!

 

The trucks going 11's are no where near 4800 pounds. Every thing that can be removed has been.

 

Just to clarify, this is the hp needed with full street trim and no JL gutting haha.

 

I race with JL and I've never seen him "gut" his truck. I've seen a lot of people remove their tailgate and some remove their seat, but that's it. I believe anyone who is serious about racing removes the hitch and spare tire as a first mod. I actually didn't gain anything from that, I just don't get traction now. Give me some ideas of what he guts from his truck.

 

just an fyi, these trucks only lose 11.2% through the drivetrain

 

not to flame anybody... but only 11.2% lost to the rear wheels!!!!! i mean i have seen dyno tests of bone stock vipers that put out 360 to the rear wheel(rated 450 at flywheel)(an article in a high performance mopar magazine from earlier this year) for a loss of 20%. and i have seen dyno test of a bone stock 89 conquest tsi automatic that put out 136 to the rear wheels(rated 188 from the factory) for a loss of about 28%.. it seems nearly infeasable for a automatic truck to lose only 11.2%. and even if there is a dyno of a bone stock truck putting out approx 337 rwhp do anyone think that more likely that these trucks are underrated from the factory(as a 380hp should not be able to pull 4800 lbs w/driver to a high 13 sec 1/4 mile run) or that ford has discovered some manner of drivetrain magic that enable their vehicle to put out those astounding numbers..... just my 2 cents anyways

n8

 

Why didn't you just say: "not to flame anybody...........BEEFCAKE"
hehe...j/k

actually though, I think n8r has it right on. I don't think Ford sprinkled any pixie dust on their tranny to elminate drivetrain loss.

You cannot escape the laws of physics when discussing mass accelerating over a certain distance at a certain elapsed time. You need a certain amount of force to do it. Maybe the HP and ET calculators on the 'net aren't perfect, but they aren't unrealistic

Joe

 

check out this link... if we put in these numbers...
11.99 @ roughly 112mph ( that is about what you would run in the high 11's) and 4800 lbs, you get a grand total of 550 on the rear wheels. That is about 600 @ the motor. Giving wind resistance, tire drag and track/weather conditions you would need a really perfect day both weather/ mental/physical to make a 11.99 run. I am by no means an expert either but I have had some experience in this field.



Here is the link.http://www.mustangworks.com/analyzer.html

 

Well,

Considering I just spent about 2 hours the other day with the engineer that designs and builds these trannies, who also builds the Facory tech shift kit, has 20 years or so in the industry, has access to all of the testing equipment.

He said the # is 11.2%,

that is why most people think these things are underrated from the factory because they usually dyno around 330 to 340 stock.

most people think they should be 304 if you figure the 20% loss.

it's just a damn good tranny!

i'm sure factory tech will be jumping in on this one soon

 

I guess our motors are underrated.

Stock, I made 355rwhp. That is about a 9.2% loss the way I figure it. There is no way we only lose 9.2% and 11.2 % seems pretty low also. I think the motors are a little underrated and we do have an effecient drivetrain especially compared to older standards.

On the other hand what does it really matter and lets not get our shorts in a knot (again) over this.

 

The magic in these trucks, is due to the hard work of "The Three Tuners" thats Johnny, Sal, and Jim pictured above. they must have been receiving an award or something because they are usually pretty greasy

 

I understand what you guys are saying. I was quite surprised myself.

First think I said when the kit was being installed was something about the 20% drivetrain loss.

Greg said 11.2% for the tranny

I said, yeah, but the rear end and everything too.

greg said 11.2% to the wheels, bottom line, no ifs ands or butts

with most people dynoing around 340 or so, is it so hard to believe ford has a very efficient drivetrain or is willing to give us 30 to 40 free horsepower.

after owning a 99 cobra, i can tell you, ford does not give free horsepower