power comparison - Pontiac GTO Forum
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post #1 of 9 (permalink) Old 01-06-2005, 09:40 PM Thread Starter
 
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power comparison

how is the mustang, so close on performance, with only a 4.6 litre, as apposed to the GTO's 5.7 litre. is the 5.7 detuned.
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post #2 of 9 (permalink) Old 01-07-2005, 09:53 AM
 
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There is a lot more to engines than cubes.
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post #3 of 9 (permalink) Old 01-08-2005, 02:22 AM Thread Starter
 
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hp

well explain, is it in the gearing.
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post #4 of 9 (permalink) Old 01-08-2005, 06:11 AM
 
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Quote:
Originally Posted by rsmith44
how is the mustang, so close on performance, with only a 4.6 litre, as apposed to the GTO's 5.7 litre. is the 5.7 detuned.
Tweaked cars the Ford guys send to the magazines!
I've never even had a close race with a stang in my WS-6 T/A. Most of the time they run from anyway! Hard to get on to challnege me.
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post #5 of 9 (permalink) Old 01-08-2005, 11:44 AM
 
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Well, the Ford has a 24 valve V-8, compared to our 16. The Mustang makes it's peak torque and HP 500 RPM higher in teh rpm range. The Mustang has a wider space gear ratio than we do, and a smaller rear end gear, resulting in a numerically higher gear ratio.

Mustang GTO
1st 3.38 2.97
2nd 2.00 2.07
3rd 1.32 1.43
4th 1.00 1.00
5th .67 .84
6th N/A .57
Final 3.55 3.46

Finally, the Mustang is 350 pounds lighter.

Last edited by Purdone; 01-08-2005 at 11:50 AM.
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post #6 of 9 (permalink) Old 01-08-2005, 03:02 PM
 
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Before anyone starts pointing to overhead cams and 3+ valves per cylinder as an advantage, it is slowly getting recognized by some in the auto media that GM made the right decision in staying with a single cam pushrod engine. Dual overhead cam, 4-valve per cylinder engines make more horse power per cubic inch, however, GM's engine design make more HP per installation volume, more HP per engine weight, and more HP per manufacturing dollar.
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post #7 of 9 (permalink) Old 01-09-2005, 10:35 AM
 
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The Mustang has now incorporated variable cam timing to go along with its OHC design.

I totatlly agree with you on the weight and money aspects of pushrod vs. OHC. But, the question was posed, why is a 4.6 keeping up with a 5.7. I tried to point out all areas of difference. I think a OHC engine with variable timing is going to have a much flatter torque curve, and could have a higher average HP rating. As far as what I put with the gear ratios, I don't even know which is the advantage. But, I thought I would at least post the info so others could figure it out.
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post #8 of 9 (permalink) Old 01-09-2005, 01:02 PM
 
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In a nutshell, the 4.6 ain't keeping up with the 5.7. Now the 6.0 will stretch that gap even more!
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post #9 of 9 (permalink) Old 01-09-2005, 10:31 PM
 
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I cant wait
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  Pontiac GTO Forum > The 2004-2006 GTO > Service, Maintenance and Technical Discussion

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