How can you determine your new red line?

[Reign_Maker]

I got a question for all you brainiacs out there... I mean, there is a question... For all you brainiacs out there... Right there, in my title... Why are you reading this? Just answer the question in my title... COME ON! THERES NOTHING LEFT HERE! :biglaugh: :biglaugh:


Ok, maybe I should elaborate...

You all know Im doing my monster mega mucho powered 7M, and one of the mods I'll be doing is valve train upgrades, full farrea... With the stand alone, AEM ems, I can raise my red line... But how do you determine what the new red line is? How can I find a safe red line with out blowing apart my motor?

KthxBye... :evil2:

 

[Justin727]

rev it up till it pops

 

[Reign_Maker]

But it pops from the rev limiter... If Im setting a rev limit, then what do I do to find a safe one? And I dont wanna hear: well I knwo a guy with farrea train and he's running 7500rpm...

I wanna know how to know for sure...

 

[Justin727]

i know a few 7M guys running up to 8k.... LOL no but seriously there have been a few posted in the past. Im sure on the AEM you will be able to determine it somehow.

 

[Stanzaspeed]

when in doubt, ask IJ :hsugh:

edit: ahh! devil post!!111!!!!one!!1!11!!!!

edit again: victory! no longer 666 posts!

 

[Joel W.]

I would guess when it stops pulling hard and just before it grenades. lol

 

[gixxer750]

1. build engine.
2. Do not set any rev limiter.
3. Rev it until it explodes.
4 Build new engine exactly the same way
5 set rev limter 211 rpm below what the first one blew up at.
6 have fun

 

[outofstep]

I wouldnt have any problems doing 7500 on a stock head.

Figure in 15% overload as max tolerance as engineered from the factory, or hell even 10% and 7500 shouldnt be an issue.

Work it safe, test 5% increments and check for valve float. If you're golden, bump some more. Just like OCin a CPU. Bump it just a bit, test for reliability, bump a little bit more.

 

[IJ.]

LOL @ the answers so far !!

You'll get a feel for the motor Jake and it'll let you know when it's not happy.

Given good parts and a correct build no reason why you can't run it to 8000.

Peak power may be a bit lower but here's my take on it you rev to 7700/8000 and shift the rpm drop to the next gear will still be higher than if you shifted at peak power so it comes on strong again right away.

Shifting at peak may drop you down enough to let the Turbo slow enough to be noticable (you're not running a kiddie munchkin turbo on this build)

 

[Chris-Supra]

When is it going to be possible to raise the stock rev limit on the stock ECU damnit... I want another 1000rpms, that would be MOST useful with this .81a/r SP63.

Wasn't someone working on an ECU crystal mod that raised the rev limit on pre-89 ECU's?

Sorry for the thread hi-jack:icon_bigg

 

[shaeff]

baby steps.

-shaeff

 

[Bigzavs]

i have a friend with a haltec on his 89 and he accidentally took his to a lil over 8K (got a lil too excited during a race) he didnt have any problems other than his 57 trim CT didnt wanna breathe that high, but hed never do it again (he did it on a stock jdm motor)

 

[tissimo]

a little over wehre the power stops.. prolly be ~ 7500..

 

[Doward]

No, no, no.

The ONLY way to set your rev limiter, is to take it to a dyno. Before doing that, however, CALL THE MANUFACTURER OF THE VALVE SPRING AND ASK THEM HOW HIGH OF AN RPM THEY RECOMMEND. If they recommend 8000 MAXIMUM rpm, then DO NOT EXCEED THIS.

Dyno the car, and spin the car to 7000 rpm. Still making power there, or has it dropped off? Still got injector duty cycle left? Go to 7500 on the next pull. Repeat until:

A) You blow the motor up. To prevent this, I'd recommend that you have the bottom end zero balanced (None of this nancy 1 or .1gram tolerance BS) and make sure the valve springs are up to it!

B) Power starts to drop off. At this point, I like to set my rev limit 300rpm over, so that I drop back on the high side of the torque mountain.

There you have it. I'm really sick of this 'OMG MY MOTOR WILL SPIN 7 BAJILLION RPMZ!!! MAD TOP END POWER YO!'

I don't give a RAT'S ASS how high the motor can spin! Forces on your connecting rods go up PROPORTIONALLY to the SQUARE of the RPM you spin! If you don't make power over 7000rpm, then DO NOT SPIN IT TO 8000! YOU ARE DOING NOTHING BUT ACCELERATING WEAR AND TEAR.

/rant.

 

[Anomili]

^^^ That was sweet. I feel violated just reading that post lol. Good Rant

 

[Stanzaspeed]

OMG MY MOTOR WILL SPIN 7 BAJILLION RPMZ!!! MAD TOP END POWER YO!'

:yelrotflm

 

[miggles]

^^ and thats before the Vtech kicks in

 

[tubbie]

1. build engine.
2. Do not set any rev limiter.
3. Rev it until it explodes.
4 Build new engine exactly the same way
5 set rev limter 211 rpm below what the first one blew up at.
6 have fun

:rofl: :rofl: :rofl: :bigthumb:

 

[IJ.]

Tubbie: LOL that's the one that cracked me up !

 

[gixxer750]

and what? no rep points for that????