Mods and 05 GT 3v

[streetstang03]

Anyone have any ideas about how well the 05+ 3v is going to respond to mods?? Hopefully it will be way better than how the current 2v responds to mods I hope it responds like the LS1 and such motors respond to mods


Oh ya...whats the current word on the 07 Cobra

 

[SVTdriver]

Anyone have any ideas about how well the 05+ 3v is going to respond to mods?? Hopefully it will be way better than how the current 2v responds to mods I hope it responds like the LS1 and such motors respond to mods


Oh ya...whats the current word on the 07 Cobra

It's going to be great. I hear you can get up to 700 rwhp with a turbo on the stock internals. And the computer is going to be able to be programmed from the dash.

 

[spectravp]

It's going to be great. I hear you can get up to 700 rwhp with a turbo on the stock internals. And the computer is going to be able to be programmed from the dash.

 

[tjm73]

.....Hopefully it will be way better than how the current 2v responds to mods I hope it responds like the LS1 and such motors respond to mods

Don't count on it responding to mods like a LS1 or the ol 5.0 did. THose engines were designed long ago and their efficency is not that great. Hell, the SB Chevy's basic design was released in 1955. It's a 50 year old engine.

Mod motors are highly tuned and design to make specific amounts of power from a comparitivly small displacement. So it will be harder to make large jumps in power.

5.7 Corvette makes 350 hp (per chevy website), that's 61.4 hp/litre
4.6 '05 GT makes 300, that's 65.2hp/litre. So it's a bit more efficent. It doesn't look like a lot, but there is a significant difference.

 

[FinlayZJ]

Just like what Tim said..............

Modern engines are much more efficient than engines of old. The more power the factory can squeeze out of an engine, the less there is in bolt on/aftermarket mods. Granted, a S/C or NOS will aide in power, but for basic bolt ons, i'm not sure you can get tons of extra power out of it. It's already making a ton of power out of 281 cubic inches. I'd say save your pennies and get a supercharger.

 

[Rootus]

Don't count on it responding to mods like a LS1 or the ol 5.0 did. THose engines were designed long ago and their efficency is not that great. Hell, the SB Chevy's basic design was released in 1955. It's a 50 year old engine.

FYI -- the LS1 has no relationship to the SB 350 other than the fact that it's made by GM.

Dave

 

[ryanrule]

Don't count on it responding to mods like a LS1 or the ol 5.0 did. THose engines were designed long ago and their efficency is not that great. Hell, the SB Chevy's basic design was released in 1955. It's a 50 year old engine.

Mod motors are highly tuned and design to make specific amounts of power from a comparitivly small displacement. So it will be harder to make large jumps in power.

5.7 Corvette makes 350 hp (per chevy website), that's 61.4 hp/litre
4.6 '05 GT makes 300, that's 65.2hp/litre. So it's a bit more efficent. It doesn't look like a lot, but there is a significant difference.

yeah, but ls1 can make like 450 with h/c/i

3v better have at least some modability without too much money, or there will be a very limited aftermarket

 

[SVTdriver]

yeah, but ls1 can make like 450 with h/c/i

3v better have at least some modability without too much money, or there will be a very limited aftermarket

Have you seen how limited the current mod motor is? Is anyone yet making heads for them other than Ford racing? Maybe the 3 vlave will catch on a little faster getting performance pieces out. But I wouldn't count on it.

 

[63_Fairlane]

"There is no replacement for cubic inches... except cubic dollars"
I want to attribute that quote to Smokey Unick, but i am not sure about it.


The 4.6 3V seems to have every performance tweak available at present minus Variable lift and direct injection. Of course, there is some leeway in the computer tune for more power since the car is tuned for 87 octane. The factory exhaust is probably a bit restrictive so there may be some gains to be had in that area. A good port and polish might yield some additional power.

There just isn't going to be a silver bullet that adds 75hp to these like a new set of heads and intake on an old 5.0 because most of the work has already been done. The heads already flow, the cam timing is computer controled, the stock intake manifold looks pretty good, etc... Ford has done their job.

Hacking the computer is probably the best bet.

 

[ryanrule]

if they had done their job, it would have more hp. the high end v6's that are maxed out have almost as much hp

 

[Phoenix00GT]

The fact that it will have an extra valve tells me that it will respond to boost a little more like the 4v motors do now. Also, you could try to get more displacement out of them (i.e. bored and/or stroked).

Other than that, they have made good headway into creating the most efficiency possible.

All of this being said, you all know that the aftermarket will come up with a ton of bolt-ons that will add (mostly nominal) ammounts of power here and there.

For my money, I'm waiting a couple of years for the SVT model, and if it isn't blown and making at least 420 at the crank I'll get myself a Vette.

 

[TheMaster]

5.7 litre LS6 405hp 71.05 hp/litre and 4.6 '05 GT 300hp 65.2hp/litre so the pushrod motor is more efficent.

 

[SVTdriver]

5.7 litre LS6 405hp 71.05 hp/litre and 4.6 '05 GT 300hp 65.2hp/litre so the pushrod motor is more efficent.

And the GT-r motor has 400 hp out of a 5.0 liter engine 88hp/litre. Much more efficient. It's all in how you tune the motor. And also back to the old statement. There is no replacement for displacement.

 

[M1Rifle]

5.7 litre LS6 405hp 71.05 hp/litre and 4.6 '05 GT 300hp 65.2hp/litre so the pushrod motor is more efficent.

The LS6 uses premium fuel! I would hope it could produce more hp/liter

 

[63_Fairlane]

if they had done their job, it would have more hp. the high end v6's that are maxed out have almost as much hp

Almost as much HP.... The Ford engineers did their job within certain contraints, 87 octane, 3 valves per cylinder, etc... Tune this engine for 92-93 octane and it will probably pick up a good bit of horsepower. Pure speculation, but I would put bets on as much as 20 hp power with a radical tune.

The V6s that you are talking about are top of the line engines.There is no Cobra/Mach/Shelby/ above a regular 350Z, etc. They are sporting 4 valve heads, require premium fuel, etc. Part of designing the Mustang GT is leaving room for higher end models which may have 4 valve heads, super chargers, require premium fuel, have larger displacements, etc. This has been discussed.

 

[tjm73]

5.7 litre LS6 405hp 71.05 hp/litre and 4.6 '05 GT 300hp 65.2hp/litre so the pushrod motor is more efficent.

In that particular setup, yes it is. The Cobra makes 84.78 hp/liter, but blowers tend to make engines more efficent in many ways.

 

[Z28Marcus]

yeah, but ls1 can make like 450 with h/c/i

3v better have at least some modability without too much money, or there will be a very limited aftermarket

That's lowballing I'd say. More like a solid 475-480 HP, while passing emissions and retaining very good drivability has been attained, PCM tune needs to be tweaked a little of course.

 

[mattdee1]

If they designed the engine with a higher compression ratio and required premium fuel, this engine would easily be capable of 350hp.

Remember, the main reason why Japanese engines get so much peak power out of relatively small displacements is the fact that they rev so high. And unfortunately, simply revving high isn't enough -- the engine has to be able to breathe well at the high RPM. This is where variable valve timing comes in.

Anybody who's ever revved a 4.6 2V into redline knows how quickly this engine falls on its face in the high-rpm range. That's because the intake system is not tuned to achieve a good volumetric efficiency in this range.

The VVT should help out in this regard, and perhaps make the engine slightly more responsive than the 2V to mods that make the engine breathe easier.

 

[tjm73]

The VVT should help out in this regard, and perhaps make the engine slightly more responsive than the 2V to mods that make the engine breathe easier.

Exactly what I was thinking. Visualize a KB blower on top of the engine. I'm interested in seeing how it responds to that!!

 

[CatmanJJ]

Hp per liter, WTF am I on a ricer site?