How similar is the Shelby engine to the Ford GT?

[Z06 KILLER]

I recently saw a new Shelby with a Kenne Bell blower on it at the Kenne Bell facility. They told me the blown 5.4 liter Shelby put down 425 horse to the wheel on their in house chassis dyno in stock form. I believe the Ford GT makes approximately 525 to the tire stock. Is this 100 rear wheel horse advantage due to a superior OEM blower or motor? Or is it a combination of both?

[185MPH]

From what i've heard the motor is the same execpt the Gt motor is forged and the GT500 motor is some composite not forged not cast thing. The blower is the main difference , with a twin screw the GT500 would make similar power levels.

[Biggest]

The Shelby motor is cast iron block, the GT motor is aluminum block (400 pound difference). Different blowers account for the HP delta. And a GT with 525RW is very strong stock and dyno'd under ideal conditions.

[The Great One]

Originally Posted by Biggest

And a GT with 525RW is very strong stock and dyno'd under ideal conditions.

I thought that they typically dyno'ed at about that. I know they were very underrated. The highest stock that I can recall was almost 550 RWHP

[Paul Beach]

Originally Posted by The Great One

I thought that they typically dyno'ed at about that. I know they were very underrated. The highest stock that I can recall was almost 550 RWHP

It tops out at 214 stock, too.

[The Great One]

Originally Posted by Paul Beach

It tops out at 214 stock, too.

Go to the GT forums and search it up, then you can stfu.

[kmodstang]

at the NYIAS ford had a display set up that showed a bunch of engines outside of the car and you can see a noticeable difference between the blower on the GT and the blower on the Shelby.

[tom86zt]

Plus the GT is Dry sump where the Shelby is not...........
GT has dual injectors per cylinder Shelby has 1 per
GT has a Twin screw blower, Shelby has a roots (and I believe they run different boost, like 11 on the gt and 9 on the shelby)

[Paul Beach]

Originally Posted by The Great One

Go to the GT forums and search it up, then you can stfu.

Go to streetfire and there is a video of the run on the Autobahn.

[CHAD]

They run 212 unrestricted supposedly, as they are in Europe.

[Mark O]

Originally Posted by Biggest

The Shelby motor is cast iron block, the GT motor is aluminum block (400 pound difference).

Are you sure about that?? A bare cast iron 426 Hemi Y block & bare heads doesn't even weigh 400 lbs. I can't imagine that a cast iron small block Ford V-8 could weigh in at more than 125-150 lbs.

[Biggest]

That's just what they told me at SSV when we were discussing the differences between the GT500 motor and the GT motor Saleen uses in the Extreme Mustang.

[DR EVIL]

the 400 lbs difference refers to the weight difference of the vehicles......there might be 100lbs difference between the blocks.

differences in the two motors are block, rods, pistons, crank, cams, blower.


I believe the only common parts are the heads and maybe some gaskets.

[Got-Busa?]

Where did you find that info?

The last thing I read said they had the same cams....


Don't forget these Shelbys come with a very safe tune from the factory. With just a reflash they are pulling 475rwhp with NO other mods.

[DBK]

Originally Posted by CHAD

They run 212 unrestricted supposedly, as they are in Europe.

I don't know if there even is a limit in the U.S or if they just say that. I've got a homemade DVD of the two cars at Nardo for testing and on their first lap out to try and certify for 205mph they went 208. Whoops. In both cars. They did four laps, and called it good. Both were U.S CP cars, and both are still being driven around today.

I think it was two days later and they were out doing additional foot to the floor testing and it went 211.89. I was pretty impressed because the digital read out was still climbing pretty good even at 200+...