Setting rev limit on MSD box?

gregkelley · April 14th, 2007, 03:07 PM

Where do I need to set my Rev limiter at on my MSD box? 6K 7K 8K?

angermgt · April 14th, 2007, 03:37 PM

depends on where hp peaks.

gregkelley · April 14th, 2007, 03:52 PM

Dont really know?

angermgt · April 14th, 2007, 05:07 PM

well for some help i have 475 rwhp and my box is set with the 6k pill.i could go higher but the safe way is usually the best way.take the car out and hammer it. find an approximate rpm where it stops "pullin" and thats where i would put it, anything over that is just slowin you down. its probably right around 5500 depending on mods(cam, intake, heads,etc.)

tording92lxnotch · April 14th, 2007, 05:52 PM

Some info about your car would help us to better help you. If its stock heads/cam/intake then I doubt the car is making power much beyond 5k. If you have upgraded all the previous stuff I mentioned then it could be 5700 or 5800 or even 6000. As already said you don't want to rev past where your car stops making power because its just slowing you down.

gregkelley · April 14th, 2007, 08:51 PM

it has been converted to a 650 Holly carb ,eldebrock victor jr intake, msd distributor,msd 6al, msd coil, after market plug wires

Stangzilla · April 14th, 2007, 10:32 PM

Originally Posted by gregkelley

Where do I need to set my Rev limiter at on my MSD box? 6K 7K 8K?

Unless you have a Programmable Management System or a rpm extender the factory computer will kick the rev limiter in I think at 6250rpm.. So no matter what chip you put in the MSD the computer will override it.. Unless you put a 6k in it...

Stangzilla · April 14th, 2007, 10:35 PM

Oops I just read its a carbed car.. I doubt that car makes power past 6k.. Prob less...

tording92lxnotch · April 15th, 2007, 01:28 PM

I would put the 6k pill in it for now and go get it dynoed. Find out where it stops making power and then change it. With that setup is not making power over 6k for sure so you will be safe at 6k.

Stangzilla · April 15th, 2007, 01:47 PM

Well its not for sure to say that he will be safe at 6k. If the car stops makin power at say 5500 then if for example the power drop is due to the valves floating. If he revs it to 6k all the time there could be an issue with some valvtrain breakage.. I would put the 5.5k in it until you get it tuned then bring a 6k and a 6.5k and see what one you need.

tording92lxnotch · April 15th, 2007, 02:05 PM

I would hope he doesn't have valve float at 5500, even a stock 5.0 factory limiter is 6250 yet I wouldn't recommend revving that hight but yes if you do then to be extra safe 5500 would be better yet. You really need to find out where it stops making power is the bottom line.

Stangzilla · April 15th, 2007, 03:45 PM

Yeah if you have stock heads.. I dont know what you have just tryin to keep you on the safe side until you get it tuned... But yeah you are right about the 6250rpm limiter on a stock injected motor. Even though that motor stops making power way before that..

angermgt · April 15th, 2007, 06:20 PM

get in and hammer it see where it falls off!

85cobradude · April 22nd, 2007, 09:19 PM

DYNO IT. YOU'LL FIND UR PEAKS THEN.

HMUSN · April 22nd, 2007, 09:22 PM

Damn you fox guys are old..

you need to take pills in order to go fast

j/k..i love the foxes!

i miss my 86 4eye

April 14th, 2007, 03:07 PM	#1
gregkelley Regular Join Date: Feb 2007 Posts: 52	Setting rev limit on MSD box? Where do I need to set my Rev limiter at on my MSD box? 6K 7K 8K?

April 14th, 2007, 05:52 PM	#5
tording92lxnotch Regular Join Date: Apr 2007 Posts: 165	Some info about your car would help us to better help you. If its stock heads/cam/intake then I doubt the car is making power much beyond 5k. If you have upgraded all the previous stuff I mentioned then it could be 5700 or 5800 or even 6000. As already said you don't want to rev past where your car stops making power because its just slowing you down. __________________ 92 notch--Shorty headers--Pro 5.0--3G alt--U/D pullies--A/C delete--190 LPH Walbro FP--Compucar N2O kit--FMS alum D/S--Taurus fan--Weld Draglites--Mallory 685 ign Box--dccontrol fan controller 13.0 - 108 mph - 1.9 60' - 90 shot N2O and 175k on the clock

April 14th, 2007, 10:35 PM	#8
Stangzilla MM Fanatic Join Date: Aug 2006 Location: On my way to Baines's house!! Posts: 3,007	Oops I just read its a carbed car.. I doubt that car makes power past 6k.. Prob less... __________________ Rotating The Earth 1320 Feet At A Time!! The very existence of flamethrowers proves that sometime, somewhere, someone said to themselves, “You know, I want to set those people over there on fire, but I’m just not close enough to get the job done.”

April 15th, 2007, 01:28 PM	#9
tording92lxnotch Regular Join Date: Apr 2007 Posts: 165	I would put the 6k pill in it for now and go get it dynoed. Find out where it stops making power and then change it. With that setup is not making power over 6k for sure so you will be safe at 6k. __________________ 92 notch--Shorty headers--Pro 5.0--3G alt--U/D pullies--A/C delete--190 LPH Walbro FP--Compucar N2O kit--FMS alum D/S--Taurus fan--Weld Draglites--Mallory 685 ign Box--dccontrol fan controller 13.0 - 108 mph - 1.9 60' - 90 shot N2O and 175k on the clock

April 15th, 2007, 01:47 PM	#10
Stangzilla MM Fanatic Join Date: Aug 2006 Location: On my way to Baines's house!! Posts: 3,007	Well its not for sure to say that he will be safe at 6k. If the car stops makin power at say 5500 then if for example the power drop is due to the valves floating. If he revs it to 6k all the time there could be an issue with some valvtrain breakage.. I would put the 5.5k in it until you get it tuned then bring a 6k and a 6.5k and see what one you need. __________________ Rotating The Earth 1320 Feet At A Time!! The very existence of flamethrowers proves that sometime, somewhere, someone said to themselves, “You know, I want to set those people over there on fire, but I’m just not close enough to get the job done.”

April 14th, 2007, 03:37 PM	#2
angermgt Regular Join Date: Nov 2006 Location: new jersey Posts: 131	depends on where hp peaks.

April 14th, 2007, 03:52 PM	#3
gregkelley Regular Join Date: Feb 2007 Posts: 52	Dont really know?

April 14th, 2007, 05:07 PM	#4
angermgt Regular Join Date: Nov 2006 Location: new jersey Posts: 131	well for some help i have 475 rwhp and my box is set with the 6k pill.i could go higher but the safe way is usually the best way.take the car out and hammer it. find an approximate rpm where it stops "pullin" and thats where i would put it, anything over that is just slowin you down. its probably right around 5500 depending on mods(cam, intake, heads,etc.)

April 14th, 2007, 08:51 PM	#6
gregkelley Regular Join Date: Feb 2007 Posts: 52	it has been converted to a 650 Holly carb ,eldebrock victor jr intake, msd distributor,msd 6al, msd coil, after market plug wires

April 15th, 2007, 02:05 PM	#11
tording92lxnotch Regular Join Date: Apr 2007 Posts: 165	I would hope he doesn't have valve float at 5500, even a stock 5.0 factory limiter is 6250 yet I wouldn't recommend revving that hight but yes if you do then to be extra safe 5500 would be better yet. You really need to find out where it stops making power is the bottom line. __________________ 92 notch--Shorty headers--Pro 5.0--3G alt--U/D pullies--A/C delete--190 LPH Walbro FP--Compucar N2O kit--FMS alum D/S--Taurus fan--Weld Draglites--Mallory 685 ign Box--dccontrol fan controller 13.0 - 108 mph - 1.9 60' - 90 shot N2O and 175k on the clock

April 15th, 2007, 03:45 PM	#12
Stangzilla MM Fanatic Join Date: Aug 2006 Location: On my way to Baines's house!! Posts: 3,007	Yeah if you have stock heads.. I dont know what you have just tryin to keep you on the safe side until you get it tuned... But yeah you are right about the 6250rpm limiter on a stock injected motor. Even though that motor stops making power way before that.. __________________ Rotating The Earth 1320 Feet At A Time!! The very existence of flamethrowers proves that sometime, somewhere, someone said to themselves, “You know, I want to set those people over there on fire, but I’m just not close enough to get the job done.”

April 15th, 2007, 06:20 PM	#13
angermgt Regular Join Date: Nov 2006 Location: new jersey Posts: 131	get in and hammer it see where it falls off! __________________ http://i11.tinypic.com/485udec.jpg 473whp/432wtq 13lbs. boost

April 22nd, 2007, 09:19 PM	#14
85cobradude Newbie Join Date: Apr 2007 Posts: 23	DYNO IT. YOU'LL FIND UR PEAKS THEN.

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Setting rev limit on MSD box?

Setting rev limit on MSD box?

Re: Setting rev limit on MSD box?