[97GOLDGT]

Wsup guys, i have a 97 mustang gt stock, I was wondering is it ok to rev it to 6k rpms. I dont do it a lot, usually when im racing someone,i'll rev it that high, but usually rev it to 5200 rpms when just speeding up on to the freeeway n stuff....so it safe to rev to 6k?? Car is compeltely stock, bessides 40 flows.

o yeah and how much power would I get if I chipped it, and what is the difference between an X AND H PIPe?

thanks guys

[HMUSN]

not it's not safe
depends on the chip

the shape is the difference.
the x makes slightly more power.

[suds488]

I have a 96 GT with some mods and I never let mine get that high for fear of blowing something up. Plus I think the power drops off at about 5500 so i shift right around then and it puts you right in the right spot for the next gear.

I have an X-pipe and to my knowledge you can get more ponies out of the x because of the scavenging (vacuum) effect for pulling the exhaust out of the engine. Plus I think they sound better than H-pipes

Well if your running a stock motor I'd say a chip could get you maybe 5-10 HP but you could definetly get more with bolt ons first. Spend your money on some underdrive pullies and x-pipe. You will feel a dramatic increase. I DID!

[G.T. Rags]

Originally Posted by HMUSN not it's not safe depends on the chip the shape is the difference. the x makes slightly more power.

what about on PI cars?

how hi is to hi?

[MustangMatt96GT]

well the valvesprings are the weak point. since we have the same valve springs i would say 5900 is the limit on a NPI and PI stock motor.


Once I have my motor built, with my valvesprings and everything, i will never take mine higher than 6500, because at that point the rods are the weak spot. I know people that have taken a PI swaped motor past 7000 but what is the point if you arnt making power anyway?

[G.T. Rags]

i ussually shift at about 5700-5800 when i get on it...

i hit the limiter once on the 1-2 shift trying to impress some hot girls at a car wash with the car going sideways......

it prolly only made me look like a idiot loosing control of his car

[MustangMatt96GT]

lol at the track i run mine to around 5800, even though my peak is at 5200 i run quicker when i run it up to 5800 rather than 5400.

[G.T. Rags]

:golf clap

[Boomer]

As Matt said there is no real point unless you have the components that will allow you to do so. The factory rods start to flex at around 6500 rpm going betond this will only put you out more money. Anything beyond 6000 even with most aftermarket cams and springs is really to much..

[96Snaker]

I shift my 4 valve at 5700 at the track. I get the most out of a powershift at 5500 though, as that particular rpm helps me get the most out of second gear for some reason. I don't know if it's worth getting above 6,000 rpms, seeing as how our cars typically hit peak hp/tq right around 5,500 rpms. Going any higher is fun, but not worth the risk, in my opinion. (though I've done it once or twice, lol).

[MustangMatt96GT]

Originally Posted by 96Snaker I shift my 4 valve at 5700 at the track. I get the most out of a powershift at 5500 though, as that particular rpm helps me get the most out of second gear for some reason. I don't know if it's worth getting above 6,000 rpms, seeing as how our cars typically hit peak hp/tq right around 5,500 rpms. Going any higher is fun, but not worth the risk, in my opinion. (though I've done it once or twice, lol).

Ur 4V should pull harder up top and beable to rev higher than that.

[Boomer]

Originally Posted by MustangMatt96GT Originally Posted by 96Snaker I shift my 4 valve at 5700 at the track. I get the most out of a powershift at 5500 though, as that particular rpm helps me get the most out of second gear for some reason. I don't know if it's worth getting above 6,000 rpms, seeing as how our cars typically hit peak hp/tq right around 5,500 rpms. Going any higher is fun, but not worth the risk, in my opinion. (though I've done it once or twice, lol). Ur 4V should pull harder up top and beable to rev higher than that.

Matt, the factory cams are the limitation on his car, it has the same rods also. Reving past the peak power will not gain any.

96Snaker mentioned peak torue when it is actually peak power around 5500-5700 on a 4 valve (stock).

[Boomer]

Originally Posted by Boomer Originally Posted by MustangMatt96GT Originally Posted by 96Snaker I shift my 4 valve at 5700 at the track. I get the most out of a powershift at 5500 though, as that particular rpm helps me get the most out of second gear for some reason. I don't know if it's worth getting above 6,000 rpms, seeing as how our cars typically hit peak hp/tq right around 5,500 rpms. Going any higher is fun, but not worth the risk, in my opinion. (though I've done it once or twice, lol). Ur 4V should pull harder up top and beable to rev higher than that. Matt, the factory cams are the limitation on his car, it has the same rods also. Reving past the peak power will not gain any. 96Snaker mentioned peak torque when it is actually peak power around 5500-5700 on a 4 valve (stock).

[MustangMatt96GT]

oh i thought that they made power up above 6000, maybe that is the newer 4Vs

[96Snaker]

Originally Posted by Boomer Originally Posted by MustangMatt96GT Originally Posted by 96Snaker I shift my 4 valve at 5700 at the track. I get the most out of a powershift at 5500 though, as that particular rpm helps me get the most out of second gear for some reason. I don't know if it's worth getting above 6,000 rpms, seeing as how our cars typically hit peak hp/tq right around 5,500 rpms. Going any higher is fun, but not worth the risk, in my opinion. (though I've done it once or twice, lol). Ur 4V should pull harder up top and beable to rev higher than that. Matt, the factory cams are the limitation on his car, it has the same rods also. Reving past the peak power will not gain any. 96Snaker mentioned peak torue when it is actually peak power around 5500-5700 on a 4 valve (stock).

Boomer thx for the correction. lol. But you got what I was saying :wink

[Ryan Paymaster]

Our 4v's will go to 6700, you seem to be shifting pretty early? I always shift around 6500 or so and run consistant times. I'll try a lower shift point next time.

[96Snaker]

Originally Posted by Ryan Paymaster Our 4v's will go to 6700, you seem to be shifting pretty early? I always shift around 6500 or so and run consistant times. I'll try a lower shift point next time.

Yes they will go that high but that is not where peak power is reached on my stock engine, so I choose to shift earlier, while still in the powerband. Our 4 valves do very well in high rpms, don't get me wrong, but not That high of an rpm. When I powershift from 1st into 2nd, I hit the clutch while @ 5500-5700rpms, granted the rpms then nearly redline during a powershift.

I have tuned my engine to where the redline is much less than stock... right now, I have it set for 5900 rpms. That's just for safety purposes while driving down the street, especially when someone else is driving.

[nes]

mine sees 5500+rpms everday, 6k when ever its really cold out and i wanna read my boost gauge...

[Ryan Paymaster]

Originally Posted by nes mine sees 5500+rpms everday, 6k when ever its really cold out and i wanna read my boost gauge...

On a stock GT, I'd imagine you are just trying to give it a reason to break so you can upgrade? That seems incredibly high, but I don't know your mods.

That and go for it, it must be both fun and awesome to do assuming it's not hurting her.

[Fryrice]

Originally Posted by Boomer Matt, the factory cams are the limitation on his car, it has the same rods also. Reving past the peak power will not gain any.

Yup,thats why people need some solid dyno pulls to understand their band.


But for the most parts modular motors can be spun pretty high without causing damage when done sparingly. This is one advantage they have over pushrods.