RPMs

[Cruzinaround]

Agreed...and not that I know "jack-crap" about racing...I just watch it on TV..lol but the peak HP and TQ are at around 6,500 RPM right?..so why run it up to 8250 for power..I thought it was just a cushion (if you will) for the shifting...hope this makes sense...:shrug:

The 8250 would get "blipped" at most during any point where the driver is rev matching heading into an APEX then possibly bounce close to that threshold when the downshift is completed to accomplish an engine brake heading in and already be in the sweet spot on the way out at WOT.

Depends on how twisty that road course is. And how talented the driver is.

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[ihc95]

Agreed...and not that I know "jack-crap" about racing...I just watch it on TV..lol but the peak HP and TQ are at around 6,500 RPM right?..so why run it up to 8250 for power..I thought it was just a cushion (if you will) for the shifting...hope this makes sense...:shrug:

I think the Voodoo makes peak power at 7500 with it holding pretty steady up to 8250. I think the car would be faster shifting at redline than if you shifted at ~7500.

 

[Mystic_Cobra]

Something's just not right here. Ford's not going to produce its "most track-focused vehicle ever" and prevent it from running flat out at the track. There were plenty or reports of the cars hitting the redline last week from the media preview at Grattan. Several of those guys actually know what they're doing, and many of them are racers. Don't you think at least one of them would have reported something strange about the way the car revs - especially since Ford is pushing so hard to promote the 8,250-rpm redline?

Exactly what I'm thinking. I'm sure it will make sense once we get the real story.

 

[Khell86]

Are the gear ratios known yet for the this modified version of the transmission for the GT350? After watching the hotlap POV video at Grattan, the car seems to have long gears.

To my eyes it looks like its dropping back down to 6K RPM's between shifts from 3rd to 4th gear.

 

[Mystic_Cobra]

I'm confused. Who said anything about WOT?

I did. I'm just saying that people don't typically hold an engine at redline in a gear. They go to WOT and the engine revs and then they shift.

Maybe when you up shift, it does reset the timer (even though the language here doesn't suggest that). That would make more sense.

Using that graph above, if you shift at 7500 instead of 8200, it puts you back in the green (err, blue) at about 6000 rpm and allows you to rev again.

 

[FPCV8YO]

Are the gear ratios known yet for the this modified version of the transmission for the GT350? After watching the hotlap POV video at Grattan, the car seems to have long gears.

To my eyes it looks like its dropping back down to 6K RPM's between shifts from 3rd to 4th gear.

http://www.mustang6g.com/forums/showthread.php?t=28792

 

[Grimace427]

After watching the hotlap POV video at Grattan, the car seems to have long gears.

It seems that way due to how high the engine can rev compared to the regular GT. Actual gear spacing is very similar to the GT's Getrag but with 1,250 more RPM's to play with you will spend a little longer in each gear.

Same thing for low revving engines and wide gear ratios.

 

[chopsui]

I did. I'm just saying that people don't typically hold an engine at redline in a gear. They go to WOT and the engine revs and then they shift.

Maybe when you up shift, it does reset the timer (even though the language here doesn't suggest that). That would make more sense.

Using that graph above, if you shift at 7500 instead of 8200, it puts you back in the green (err, blue) at about 6000 rpm and allows you to rev again.

Well as long as I don't have any issues on the back straight at COTA, I'll be happy.

My local club track is small enough that I'm sure there wont be any issues either way.

 

[350Mike]

I think the Voodoo makes peak power at 7500 with it holding pretty steady up to 8250. I think the car would be faster shifting at redline than if you shifted at ~7500.

90% of peak torque is at 3450 so you won't be shifting at 8250 for fastest lap times. You might rev it out to make a pass or a fly through in a high speed corner where you just can't shift yet. If you're shifting at 8250 I imagine you're wasting some of the power band, like starting the next gear obove the optimum RPM range or sweet spot for fastest acceleration. Just my thoughts. Probably why they call it over rev and not a shift point. Perfect example is the Ecoboost mustang, from what I hear is it peters out on the top end forcing you to shift early.
Something that's commen to all internal combustion engines and nothing to think to much about.

 

[Khell86]

http://www.mustang6g.com/forums/showthread.php?t=28792

Ok so then

2nd to 3rd = 5661 RPM
3rd to 4th = 5956 RPM
4th to 5th = 6345 RPM but by then you're already doing 142 MPH.

So are there any straights that would require you to go over 142 mph and thus shift into 5th gear, which wouldnt allow you to drop below the 6250? I'm also assuming you need to do so to keep the overrev feature from kicking in.

 

[Spa2k]

Possibly Road America, depending on how hard this thing pulls. :shrug:

 

[AgentOrange]

This is impressive: "90 percent of peak torque produced from
approximately 3450 – 7000 rpm"

This not so much: "Engine Overrev Indicator
• Helps increase the performance range of Shelby GT350
• Overrev is indicated on the tachometer by raising the
redline from 6250 to 8250 rpm
– When conditions permit, overrev is indicated by a
8250 rpm redline
– If conditions limit overrev accessibility, the
tachometer redline is illuminated at 6250 rpm
• Engine torque and maximum rpm are limited until
coolant temperature reaches 170 degrees F
• Warm-up is indicated when the illuminated
tachometer redline changes from 6250 rpm to
7000 rpm
• Once the engine is warm, the overrev feature allows
8 seconds above 6250 rpm up to 8250 rpm
• If the 8-second time limit is exceeded, maximum
engine rpm is reduced to 6250 until both of the
following occur:
– Engine is operated for at least 15 seconds below
6000 rpm
– Engine rpm falls below 5000"

After googling I noticed this info posted on camaro6, but do you have an official source from Ford discussing this that you can link us to?

 

[350Mike]

The Ford training guide

 

[R 350 gt Donson]

Ok so then

2nd to 3rd = 5661 RPM
3rd to 4th = 5956 RPM
4th to 5th = 6345 RPM but by then you're already doing 142 MPH.

So are there any straights that would require you to go over 142 mph and thus shift into 5th gear, which wouldnt allow you to drop below the 6250? I'm also assuming you need to do so to keep the overrev feature from kicking in.

142 MPH's for 8 seconds...that's a lot of ground covered....that would be a long track...IMO

 

[disneyfun1]

After googling I noticed this info posted on camaro6, but do you have an official source from Ford discussing this that you can link us to?

http://www.mustang6g.com/forums/showthread.php?t=28945

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