D16A6Turbo

what's all the super loud popping that can be heard. Is that detonation or an overly rich condition causing them to backfire...

Evil DOHC

MSD 2 STEP Baby.
EVIL

STHPERFORMANCE

those suckers leave the line at 30psi sometimes.... gotta love that sound.. My friends pro-street integra is just as loud as some of those pro cars and he drives his on the street... scares the **** out of people

Pelican

I bet they don't leave at 30psi
My guess would be full boost at the line would be like 15
And then up from there

D16A6Turbo

explain the MSD 2 step. why would it make all the loud popping

lazerus

It's probably an antilag setup of some sorts.

http://www.22b.com in the movies section....

inspyral

It's a 2-step rev-limiter. They sit there witht he throttle wide open, and the 2-step limits their revs to whatever their launch RPM is by cutting spark. Since the the throttle is wide open, it pre-spools the turbo.

TurboedGSR

retards the timing to spool the turbo

simple4012

I dont think its got nothin to do with antilag. Most pro usually only launch at lower boost like ~20 psi. The loud popping is most likely coming from the WG as well as the exaust from sitting on the 2 step with boost. ***** hot though either way

TenaciousC

what it does is set the rev limiter for somewhere really low...this way they just sit there full throttle and bounce off the (rev limiter) letting them launch at full boost

FFgaeson

that popping is the car on its 2 step rev limiter its popping like that because it's a tuned backfire used to help spool the turbo at the line

and yes those cars are boosting as high as 30psi off the line...

bretx0r

the no spark makes for a lot of unburnt fuel gases which spools up the turbo

Jared

wasnt there a huge thread on this about a month ago?

AR Fab

OK.....When your on the 2 step, ignition spark is cut in a certain order or sometimes random then next time it comes around to fire that cylinder there is excess fuel that is in the exhaust port that ignites in the manifold....This ignition is sort-of controlled detonation which spools the turbo BUT.....when this detonation occurs close to the turbine its like hitting it with a hammer especially on a race car. Also this "controlled detonation" reduces the life span of valves and valve springs. And most of the pro racers I know launch at around 15-20 psi. We dont launch at any boost, we rely on RPM and Nitrous off the line. When we launch our RPM is around 6000 and our nitrous engagement point is 5K. Being that I dont hit WOT until I release the clutch the Nitrous stays ready until I lay into it and release the clutch. As soon as our Nitrous hits the chamber we have seen datalogs of 50-60 psi spikes because of the violent increase in cylinder pressure from the nitrous....The 2 step method of launch control is some peoples eyes is bad....The anti-lag retards timing and adds gobs of fuel. This will also have the same result with the poping. Lots of V8 guys run throttle stops to keep them from destroying valve train, but this will not help us because they dont help increase boost. Throttle stops are a mechanical device that keeps the throttle plate open just enough to rev to a set point even when the foot is to the floor. Then when the device is released it allows the throttle plates to open 100%. "free revs" Doesnt help build boost.

Hope this gives a detail explantion for you....More info on this is avail. from MSD

Howard

DRAGLS

So will the 2-step cause any damage on a daily driven
car?

Etylorcen

Read ar fabs post!
This reminds me of a funny story. Long time ago when I went to the track for the first time I was on the side lines to the right of the box when adam s. rx7's was warming up his tires. I was standing by the concrete wall just checking everything out when he started to burn out shooting flames and soot my way. Scared the **** out of me and it didnt smell too great.

DLB1994

i have got 10psi sitting still with 2step at about 5700rpms

MiraiZ

also see backfiring system or Initial D stage 2 vs. Evo IV race

IntegD

Misfiring System!

Suprdave

A 'Bang Bang' Misfiring System is different than a Rev-Limiter.

Suprdave

IntegD

Yeaaa I kno..I was just responding to the Initial D thing....

Cant wait to get my hondata 2 step hooked up...oh wait..I still need a DP and injectors....

sporkcrx

Is there a way to rig this up on ours cars??? I have enough traction problems as is without boost, but I enjoy it most in 3rd gear when the other person just seems to hit a wall

mskibbz-T

Just got my Digital 6 from Summit Can't wait to throw that bad boy in

Suprdave

What makes the Digi-6 better than a 6AL with the Rev-Limiter?

Especially ona Car with a Distributor.

Suprdave

tony1

Well, the digital 6 only works with a distributor, it's the dis that is for individual coil setups. The digital 6 has a stronger spark among other things. It also has a timing retard option that is triggered by 12v. Good for nitrous.