I knew it was underrated, but not by that much...ouch...Lutz better get ready to bring it if the next Z06 is going to blow the doors off this...

LINK

discussion at stangnet

 

http://web.camaross.com/forums/showt...&highlight=565

Theres a link to it in the lounge....I still call on 565 to the wheels...

The testing verson that MT had could barely take a Viper which is putting out 500 NET HP. And they nearly weigh identical...

 

What exactly are the differences between the blown 5.4 in the Ford GT (at over 550 actual hp), and the blown 5.4 in the Lightning/Harley Davidson Truck (at about 420-430 actual hp)?

Anyone???

 

my reply to that topic. Just copied and pasted over to this one.

1) pre-production prototype. According to MT, the one they used for testing was a well-worn prototype that has already seen tons of testing/abuse. That and that testing took place either late last summer or early fall. Months have since gone by, and the GT's engine further tweaked and tuned. It wasn't as far in the development stage as it is now. Now, the GT should be nearly complete.

2) Newer test which was in C&D had the GT trapping 128mph, which would hint at a seriously underrated car. That's 5mph faster than a 500hp SRT-10 which weighs the same. Trapping 5mph higher is no joke.

3) According to the autoextremist website, the GT just passed powertrain certification and will be rated at 550hp, and not the estimated 500hp we've been hearing about since the concept debuted 2 or so years back.

4) Have you looked at what smaller 4.6L Dohc with an aftermarket Twin screw blower (GT will have one from factory) and 12psi (stock setting for GT) makes? I'm going to take a wild guess and say somewhere near or in between 470-500rwhp. The GT's bigger and better 5.4L should be capable of 565rwhp with its twin screw blower and 12psi of boost. I personally don't doubt it is capable of those numbers at all.

Anyways, they should hit streets soon. Then we'll get the facts. Yeah, there's the possibility that this is BS, but there's also the real possibility that it isn't.

Edit: That Viper vs GT wasn't a side by side test btw. They just reused the best numbers they were able to muster from the SRT-10 from previous tests. They were tested on the same date, place, etc... I don't know why they'd bother doing a side by side test and just testing one car while reusing numbers from a previous test for the other car.

 

I'm pretty sure the blown 5.4 in the Lightnings were iron blocks with AL heads...They were also 2V SOHC rather than the GT-40's 4V DOHC, and lack the top-shelf racing technology used in their supercar.

 

Lots of differences. From what i've read 85% of the GT is all new, meaning it only shares 15% of the parts with other 5.4's. I believe the differences are greater between the GT's 5.4 and L's 5.4, since the closest 5.4 to the GT's would be the Navigator and Cobra R (so the articles say).

Anyways, major differences off the top of my head: GT has more efficient twin screw blower compared to the L's roots style, higher flowing Dohc heads to the L's sohc, stronger internals, Aluminum block to the L's iron, higher boost setting ( i believe L is 10psi, and GT 12psi). The GT's 5.4 also loves to revv since it peaks at 6,500rpms and L at a truckish 4,750rpms. Differences are more, but those should be the major ones.

 

From what I've read the blower is different (obviously). Also, there is a difference in the heads, though I can't find the article on that now

 

I believe it when a non-prototype/non-Fordtinkered car comes out in the publics hands in production form and then it dynos that bone stock.

 

Guion, here's a good read on the GT's 5.4 from Hot Rod mag.

http://www.hotrod.com/techarticles/engine/113_0311_gt/

 

I doubt any private owner is going to dyno their new GT let alone post it anywhere. But maybe one the Ford rags like MMFF can convince someone or maybe even Ford to bring one over for them to test.

Actually the one GT that Motortrend and CD have run should be available to the smaller mags about now.

Course this is all pretty meaningless. Who cares what the Ford GT really dynos. It's not something that affects the musclecar balance of power.

What really matters is that Colletti has stated indirectly that the GT's motor will show up in the new Lightning and Cobra. That's where dynos really matter, cuz those are the vehicles that are going to be laying an *** slapping on everything this side of the Ford GT.

That said, based on the reported dynos of the new GT I'd estimate the new Lightning and Cobra to dyno around 475rwhp stock and be severly underrated and detuned(low boost, easily correctable).

 

now that i think about it; isn't this pretty historic (if accurate)?? This has to go down as FoMoCo's most powerful production engine ever, doesn't it?

 

now if Dodge can come back and stick the 500hp srt-10 motor into the 300c, I will be very happy, lol.

 

It's not bs, i checked the GT40 at the Chicago Autoshow, awesome car.

 

That would be nuts if its true. If true, owners of Ford GTs need not fear any exotics on the roads. Looks like Ford has effectively stuck it to Ferrari again. Any news if the GT is gonna be doing any form of racing? I would hope so to honor the legacy of the original.

 

Not with factory support. Maybe a select few owners will privatly race theirs, but that would be about it. Ford has made that part clear.

I kind of agree with them though. Original won 1st, 2nd, 3rd overall. In order to do that today, you'd need a LMP900 or some prototype racer, something the GT wouldn't classify as. Now assuming Ford were to go racing, they'd have to position it within the GTS class and settle for something like 1st in GTS class and 7th overall. 7th overall? I can see why they don't want to mess with the racing legacy of the original.