[cornellm5]

Before I put the crane hi-6s on my 87 fox it didn't have a limiter I was revving it all the way up to 6k plus and now I put the crane hi-6s box on and now my limiter comes on at 5k sometimes and very few times it comes on at 6k I'm wondering did I activate the limiter or just something else is wrong and I have a a9l computer

[nolife]

The stock limiter is 6250 and they all have it unless you have a chip or rpm extender attached. Your tack may be off as well.
Why the swap of ignition? The stock ignition is very reliable and very capable.

[EscortSportage]

Never heard that before, i always heard and thought the stock ignition is weak and csnt keep up with higher revs

[cornellm5]

I figured the ignition box would help me and why Before the box my car was reving to however high I wanted it to go

[nolife]

No, the stock ignition is more reliable than anything in the same price range aftermarket, including the dizzy. It can handle 6250 with no problem. Anything above and YMMV.
To look at it another way.. When you add an MSD or something similar, you are disconnecting the coil source wires from the computer and adding your aftermarket ignition to it, the output of that new ignition box goes right back to the coil (or an aftermarket one). You aren't replacing anything at all, only adding more between it. All of your existing stock ignition system is still there and being used. Maybe you swap out the coil as well but either way... The aftermarket boxes add new capabilities like multispark discharge under a certain RPM, a seperate tack output, soft start, windowing, retarding, adjustable rev limiters (although the stock fuel pull one will still activate at 6250 regardless of your setting on your box) etc. Any of those may be required for your specific tune or application but it does not make it any more reliable or more capable and the power gains and fuel economy claimed for some of them is questionable in my opinion although some people claim they see a few more low end HP and MPG.

If you need something above 6250 (although you still have to defeat the factory rev limiter) or advanced features of an aftermarket box, go for it, other than that, you are wasting your money and adding something else to the mix that can fail. A lot of people buy them and install them so they must be doing something useful right

I have the factory coil and an MSD box (6BTM) but I only needed it so I could retard my timing under boost.

[nolife]

Originally Posted by cornellm5 I figured the ignition box would help me and why Before the box my car was reving to however high I wanted it to go

What mods do you have? If you getting anywhere close to a true 6250 rpm (not going by the factory tach which can be over 1K off) on occasion, you are shifting way to late.

[ryanw]

Originally Posted by nolife No, the stock ignition is more reliable than anything in the same price range aftermarket, including the dizzy. It can handle 6250 with no problem. Anything above and YMMV. To look at it another way.. When you add an MSD or something similar, you are disconnecting the coil source wires from the computer and adding your aftermarket ignition to it, the output of that new ignition box goes right back to the coil (or an aftermarket one). You aren't replacing anything at all, only adding more between it. All of your existing stock ignition system is still there and being used. Maybe you swap out the coil as well but either way... The aftermarket boxes add new capabilities like multispark discharge under a certain RPM, a seperate tack output, soft start, windowing, retarding, adjustable rev limiters (although the stock fuel pull one will still activate at 6250 regardless of your setting on your box) etc. Any of those may be required for your specific tune or application but it does not make it any more reliable or more capable and the power gains and fuel economy claimed for some of them is questionable in my opinion although some people claim they see a few more low end HP and MPG. If you need something above 6250 (although you still have to defeat the factory rev limiter) or advanced features of an aftermarket box, go for it, other than that, you are wasting your money and adding something else to the mix that can fail. A lot of people buy them and install them so they must be doing something useful right I have the factory coil and an MSD box (6BTM) but I only needed it so I could retard my timing under boost.

Hey Nolife do you get your car tuned ? The reason I ask is I'm going to supercharged my car next year and I wasn't sure if retarding the timing under boost can be programed into the computer or do I need to go with msd for some thing like that.

[fogged306]

Yea you can adjust your timing for boost with a chip or a tuner.

[nolife]

Yes, My crap is old school. No chip just an adjustable FPR, adjustable FMU, and adjustable boost retard. Makes decent power but I am always listening to the engine and looking at FP

[cornellm5]

Originally Posted by nolife What mods do you have? If you getting anywhere close to a true 6250 rpm (not going by the factory tach which can be over 1K off) on occasion, you are shifting way to late.

I have a 306 with ported Windsor jr heads tf track heat intake lt headers 238 cam .550 lift 112 ls and all the rest of boltons