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Old 04-12-2012, 04:31 PM   #85
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Aha... 518 rwhp... pretty much the same as my ZL585...
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Old 04-12-2012, 05:02 PM   #86
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bullshit
Why do you say that?
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Old 04-12-2012, 05:26 PM   #87
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Slow down there, buddy. These aren't the LS1's of back in the day.
if average loss is about 15% from the crank to the wheels and these are pumping out 518 at the wheels then that is 610 at the crank...
and some people say newer ones only lose 12-13% so that would make it even more...
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Old 04-12-2012, 05:49 PM   #88
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Kind of like it would have been cool to break into the "magic 11s" at the track.
Exactly.
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Old 04-12-2012, 06:37 PM   #89
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if average loss is about 15% from the crank to the wheels and these are pumping out 518 at the wheels then that is 610 at the crank...
and some people say newer ones only lose 12-13% so that would make it even more...
All engines are SAE Certified. There is no such thing as under rating engines like the good old day when there was no certification. LS3's, 5.0's, 6.1 & 6.4 Hemis are NOT under rated.

The engine is making 580hp as advertised. Give or take a couple hp.

We installed a whipple on a LS3 5th Gen with long tubes and other supporting mods. It made 505rwhp. You honestly think a stock ZL1 with a smaller TVS blower, no other bolt ons, and probably lower compression engine is makin more power??

Trust me, its the dyno.
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Old 04-12-2012, 06:43 PM   #90
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Originally Posted by ThaCamaroKid View Post
if average loss is about 15% from the crank to the wheels and these are pumping out 518 at the wheels then that is 610 at the crank...
and some people say newer ones only lose 12-13% so that would make it even more...
Not so sure the math works that way. A 15% drivetrain loss on 518 RWHP = 518/.85 = 610. So, 13% loss would be 518/.87 = 595 and 12% would be 518/.88 = 589. That's the cool thing about statistics ( and dynos ) - play with the numbers long enough and you can tell any story you want.
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Old 04-12-2012, 06:46 PM   #91
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Originally Posted by BigHemiSrt View Post
All engines are SAE Certified. There is no such thing as under rating engines like the good old day when there was no certification. LS3's, 5.0's, 6.1 & 6.4 Hemis are NOT under rated.

The engine is making 580hp as advertised. Give or take a couple hp.

We installed a whipple on a LS3 5th Gen with long tubes and other supporting mods. It made 505rwhp. You honestly think a stock ZL1 with a smaller TVS blower, no other bolt ons, and probably lower compression engine is makin more power??

Trust me, its the dyno.
So whats up with all these dynos showing the Mustang GT usually between 370 to 380rwhp? Are all the dynos wrong, or does that car have very low powertrain loss? Assuming the car makes its advertised 412 HP, that would mean it only has a 9 to 10% drivetrain loss....otherwise if the drivetrain loss is closer to 15%, its making 440 to 450 crank hp. At 412 HP, at a 15% loss, it should be around 350rwhp but they never are.

I was also told that the SAE rating only means they are making at least that much HP.

Look, I'm not arguing that these cars ARE making more than advertised HP, but I'd love for someone to give the reason reason to what I said above. I'm fully aware that the dyno should be used a tool to measure your gains from a baseline dyno and not as an end all be all measuring device.
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Old 04-12-2012, 07:29 PM   #92
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Originally Posted by KMPrenger View Post
So whats up with all these dynos showing the Mustang GT usually between 370 to 380rwhp? Are all the dynos wrong, or does that car have very low powertrain loss? Assuming the car makes its advertised 412 HP, that would mean it only has a 9 to 10% drivetrain loss....otherwise if the drivetrain loss is closer to 15%, its making 440 to 450 crank hp. At 412 HP, at a 15% loss, it should be around 350rwhp but they never are.

I was also told that the SAE rating only means they are making at least that much HP.

Look, I'm not arguing that these cars ARE making more than advertised HP, but I'd love for someone to give the reason reason to what I said above. I'm fully aware that the dyno should be used a tool to measure your gains from a baseline dyno and not as an end all be all measuring device.
Yes, if every 5.0 is dynoing that (which i doubt) then id say every dyno is reading high.

Remember the SRA doesnt eat up as much power as a IRS. Even with that tho a 412bhp car should not be putting down 380rwhp.

If this is the case id put my money on the dyno reading high, but we do live in a corrupt world so anything is possible. Maybe ford is paying off whoever is certifying these engines, lol. Never know.
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Old 04-12-2012, 09:19 PM   #93
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Ready for what?
Its ready for its competition. Bring it!
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Old 04-12-2012, 10:06 PM   #94
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Its ready for its competition. Bring it!
Have no doubt, it's coming! Be careful what you ask for.
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Old 04-12-2012, 10:18 PM   #95
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I was there today......and these beasts are alive and well. Wow! The cars will be screamers!!!!!!!!!!
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Old 04-12-2012, 10:22 PM   #96
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Originally Posted by BigHemiSrt View Post
Yes, if every 5.0 is dynoing that (which i doubt) then id say every dyno is reading high.

Remember the SRA doesnt eat up as much power as a IRS. Even with that tho a 412bhp car should not be putting down 380rwhp.

If this is the case id put my money on the dyno reading high, but we do live in a corrupt world so anything is possible. Maybe ford is paying off whoever is certifying these engines, lol. Never know.
Lol who knows. All I know is I picked four or five random YouTube videos of stock 5.0s and they were all 373 and up after some crazed mustang owner claimed they were underrated ....not saying I believe him but the evidence I saw supported his claim. Anyways don't mean too throw off this thread.
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Old 04-12-2012, 11:29 PM   #97
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Tough choice still between ZL-1.... CTS-V or a Grand Sport.... If i HAD to choose to trade my SS in... I'd likely take a GS. Weight does mean a lot in terms of feel.
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Old 04-13-2012, 10:24 AM   #98
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Have no doubt, it's coming! Be careful what you ask for.
....yeah....because they (ford) may get it.

Seriously, the zl1 seems to be in good shape. What it should also mean is that this car will be in prime shape for any power tweak that may (or may not) be required when the new gt500 hits the street.
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