Stutterbox Pros and Cons

[DGajre777]

I have an msd dis 2 how do you set up the 2 step??

http://www.msdignition.com/pdf/frm25956_for_62112_62152/frm25956.pdf
See Page 9.

 

[Karma]

Even 4500 was pretty bad, but that's as low as I'd ever go. 5000 is really a sweet spot on smaller turbos where the 2-step really comes into its own. It's all in how you launch the car- as long as you slip the clutch out smoothly the 5000 stutter shouldn't put undue wear on the car. I mean, barring mechanical mistreatment like wheel-hopping clutch side stepping you're still going to have to put some load on the tranny to get a good launch. If you're really that worried about breaking something, do what others in this thread did and get the 5000 limiter, but only use part throttle when you're launching. It will still bounce off the limiter and keep the revs where they should be, but you won't build as much boost and it will be easier on your drivetrain. Then when you really want to launch it you'll be able to go WOT and build some boost off the line.

Never thought about the partial throttle. Thanks
Can't wait to try it out this spring.

 

[pneumo]

So what do you suggest if it was a big turbo, something like a 60-1?

I have a GT35 on my car right now and I'm using 5500rpm. If I go any higher I'll roast the tires. With a big turbo you have to find a balance between not making enough boost and making so much that the wheels spin. Getting more traction helps. I'm still on street tires so I have to play it safe. Drag radials can handle more power, so the stutterbox could be raised up around 6000rpm or more.

Lightweight flywheels have less momentum, so the setting should be adjusted up by a few hundred rpm to compensate.

 

[jpbrazill]

I use an MSD DIS 2 for mine. I have it set for 3300...damn FWDs!

J.P.

 

[Caithness]

I have a GT35 on my car right now and I'm using 5500rpm. If I go any higher I'll roast the tires. With a big turbo you have to find a balance between not making enough boost and making so much that the wheels spin. Getting more traction helps. I'm still on street tires so I have to play it safe. Drag radials can handle more power, so the stutterbox could be raised up around 6000rpm or more.

Lightweight flywheels have less momentum, so the setting should be adjusted up by a few hundred rpm to compensate.

You just made me remember that I'm running an ACT Streetlite flywheel. 11.25 lbs vs 18 or 19 or whatever stock is makes for a huge difference in moment of inertia. I did have to bump up the stutter to get the same launch out of it compared to the stock flywheel. I'd say even as much as 500 rpm higher to get a similar effect. 5000 rpm on the streetlite doesn't compare to 5000 on the stocker- 5500 is more like it. So, if you had a stocker, you *might* get by with 4500, but I still stand by my advice to go for 5000 because you can always modulate the power you put down with different throttle openings, and 5000 rpm made for the biggest throw-you-back-in-your-seat factor on the stock flywheel. And it's still much, much easier to launch with a 2-step even when you're holding it at 50 or 75 percent throttle instead of foot-to-the-floor.

 

[thisdsm]

thanks for the input guys.

 

[eldiabloz13]

Now dont eat me alive for this but what is a 2 step. Also no-lift-to-shift what is that and how does it work. Im just looking for some plain answers nothing to into it if you'd like.

 

[Locke]

A 2 step rev limiter has a high limit (set to your redline) and a low limit, used for launch control. The low limit is usually set by a switch (with your line lock or trans brake) or chipped ECU's can figure it out with clutch position.

No lift to shift is another limiter, it is wired into your clutch switch and speed sensor to drop RPM for a shift, so you can keep your right foot all the way in. Helps keep turbo's spooled, as you never shut the throttle.

Both usually work by cutting spark at various cylinders at a certain RPM.

 

[eldiabloz13]

Thank you.

 

[arash15]

stutterbox sounds really cool but it drowls your motor with un-burned fuel that finds its ways throught the exhaust and drenching the rings with it too. the fuel can seep past the rings and coat the cylinder walls with fuel. plus it kills WB sensors like no other. if you dont get too crazy with the stutterbox you'll be fine.

 

[Syndicate13]

stutterbox sounds really cool but it drowls your motor with un-burned fuel that finds its ways throught the exhaust and drenching the rings with it too. the fuel can seep past the rings and coat the cylinder walls with fuel. plus it kills WB sensors like no other. if you dont get too crazy with the stutterbox you'll be fine.

That implies that you are using a ignition cut type 2 step, like an MSD soft touch. It still only cuts spark on every other stroke so you should be relatively safe. A system that cuts fuel, such as DSMlink, will not let unburnt fuel into your exhaust. Antilag is another story.

 

[northendtrooper]

why doesn't it turn off certain injectors at the specified rpm? make more sense but then could probably hurt the motor in return. true?