Why Is It That When I Hit 7,800 Rpm

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Jun 16, 2003 | 07:04 PM

#11

vosko

Super Moderator

Joined: Jul 2001

Posts: 17,839

From: NJ

Quote:

Originally Posted by rmaiersg' date='Jun 16 2003, 03:38 PM

Is there a neccessity to rev the engine up that high? Isn't max horse power at 6,500? Wouldn't it be slower if you over rev it like that?

when i raced if i revved high enough it eliminated an extra shift in the 1/4 thus lowering my overall time...................

Jun 16, 2003 | 07:18 PM

#12

ChainSawOnSteroids

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Senior Member

Joined: Jul 2002

Posts: 1,007

***, if i could i woud rev to 11k

which will be possible when i pull my engine and do the rebuild and bridge port it, or maybe peri port dont know yet

Jun 16, 2003 | 08:10 PM

#13

Erik

Senior Member

Joined: Nov 2001

Posts: 458

From: New Jersey YO!

Quote:

Originally Posted by ChainSawOnSteroids' date='Jun 16 2003, 10:52 PM

i like to rev high because it sounds FREAKIN awesome, and my power doesnt run out til about 7500rpm, it still pulls though and then comes 7800 and it hits a brick wall, lol

dude...i have the same problem...in my 91 n/a...i always did...cut off around 7500...

and THEN...one day a mustang lightly rear-ended me...but it was enough to give the car a good shake. And GUESS WHAT! after that for 2 months it RAN FLAWLESSLY...pulling up to 8500 with ease...I was stocked!

And then after about 2 months it seemed to drop back to its lazy ways...i've tried a few things...but haven't tried all the options...

Jun 17, 2003 | 12:22 AM

#14

RX7Aggie

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Joined: Apr 2002

Posts: 870

From: NASA/JSC - Clear Lake, TX

Quote:

Originally Posted by rmaiersg' date='Jun 16 2003, 01:38 PM

Is there a neccessity to rev the engine up that high? Isn't max horse power at 6,500? Wouldn't it be slower if you over rev it like that?

nope, by leaving it in a lower gear you still get more torque to the rear wheels, which give more acceleration than shifting to a higher gear, which puts your engine at a lower rpm (reduced torque) and lower gear ratio in the tranny (more reduced torque).

this is the same reason that the rx-8 has a 0-60 in only 5.9 sec, and only has 159 ft-lb of torque. it can leave it in a lower gear till 9K, putting more torque to the ground through the transfer system (drive train).