So the other night I was racing another S197 Mustang and during first gear I brought the RPM up to 6,500. I have a CAI and Tune and told them not to remove the rev limiter but it was removed and I did know that before the race, I just was not paying attention to the RPM's. But it was in the red for about 3-4 seconds and I mean it runs fine still, I won the other race but really dont care about that, just was wondering if this did any damage? But like I said it still runs like before no noises coming from the engine or anything like that. It has 30k miles as well. Thanks!
When I first got my GT I hit the stock 6250 rev limit a couple times. Put in a Tillman tune and noticed they set the limit to 6500. I left it that way a while and never once hit the limiter. The last time I changed the tune, I set it to 6300. I really don't need to rev it that high anyway. The torque is done at 5600 or so from the graphs I have studied. Haven't hit the lower rev limiter yet either. Guess I learned the sound because I know I am not looking at the RPM while getting on the freeway.
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2008 manual GT with deluxe trim, FRPP CAI, FRPP GTB Mufflers & 91 All Out Tillman Tune. 3.73 gears, Coast Ultralight Drive-shaft. 18" OEM Polished Bullitts, Webelectric Sequentials, XM built into the Shaker 500. Alarm and Escort 8500.
So the other night I was racing another S197 Mustang and during first gear I brought the RPM up to 6,500. I have a CAI and Tune and told them not to remove the rev limiter but it was removed and I did know that before the race, I just was not paying attention to the RPM's. But it was in the red for about 3-4 seconds and I mean it runs fine still, I won the other race but really dont care about that, just was wondering if this did any damage? But like I said it still runs like before no noises coming from the engine or anything like that. It has 30k miles as well. Thanks!
I think on the tach the red line shows as 6000. So if you mean you were in the red for 3 or 4 seconds and hit only a maximum of 6500 then you're fine. The Bullitt and I even think the 2010 GTs are set from the factory with a 6500 rev limit so it should be safe to that level. The 2009 GTs and earlier were 6250 from the factory.
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2007 GT - Grabber Orange, exterior appearance package, IUP, leather, 5 Spd stick, 3.55s, C and L Street CAI, BamaChips tune, Gen 2 qtr window louvers, Astra Hammond chin spoiler, Mac Pro-Chamber with cats, Saleen Heritage Spoiler, FRPP LCAs,
you didnt hurt anything if it is running normal. but if you look at any dyno run on stock cams they dont produce power at that high of an rpm. and i would guess that after 6500 you would start to get valve float and loose a lot of power then.
I thought this whole subject is dependant on what cams you have and what the dyno charts show. Does it make sense to over rev your motor if the last 500 to 700 rpm makes less torque or power than peak? Should you shift at the peak value or continue past so the next gear is closer to the best power number? Then you have to figure in the max rpm where the physical strengh of the motor is affected. I have read that the rods on th 4.6 fail when they are pulling the piston down from a high rpm and very rarely fail in compression. That sounds like you are pulling them apart as opposed to bending them in compression.
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05 GT Techco 7psi, 428hp/395tq, Tillman tune, 18x9.5 GT500 wheels, 14" Brembos, Steeda Front strut pads and front relo kit, BMR lowering springs, Tokicko D-Specs, GT500 Front lower control arms, BMR adj upper third link, BMR adj PHB, BMR rear relo brackets, boxed stock phb brace, Hooker super comp LT with Pypes HF cats, Stillen adj front & rear sway bars, Steeda sport shifter.
That sounds like you are pulling them apart as opposed to bending them in compression.
Correct. I forget the actual formula, but the forces holding the piston to the rod at the top of the stroke get really really high with slight increases in rpm.
