2 Step Question

04MidnightGT · February 4th, 2012, 04:22 AM

Okay well this might get some flaming but I'm trying to be serious here. I know a few people that have boosted vehicles that run a 2 step (evo, 370z tt, eclipse gsx), now when they get on the 2 step there's a huge bang out of the exhaust with some fire, is this healthy? I know that the plugs can get fouled after prolonged use but is there anything else?

My understanding is that when the 2 step cuts ignition fuel is dumped into the exhaust, and when it gets hot enough the fuel simply ignites causing the loud bang/fire. Is this only because of the turbo? Will mufflers cancel out this? Will my car do this when I have my turbo in and I use my msd 2 step?

Sorry for the random questions lol just curious is all.

DickH · February 4th, 2012, 04:31 AM

You are throwing extra unburnt fuel into your exhaust, its just something thats going to happen. I really have no idea how much the turbo might help, if you have cats they might get damaged. Personally im a little fond of the sound of an ignition 2 step and I would just go with it.

stal94gt · February 4th, 2012, 08:57 AM

2 step

2 step - YouTube

850rwhp03monster · February 4th, 2012, 09:09 AM

I had this on two of my evos. It's made to launch. Mufflers won't delete it. It's made to spool your turbos for bigger turbo cars. It's HORIBLE for your turbos!

Sent from my Autoguide iPhone app

850rwhp03monster · February 4th, 2012, 09:10 AM

And it is just generally really hard on the engine.

Sent from my Autoguide iPhone app

WickedSnake00 · February 4th, 2012, 10:22 AM

Originally Posted by 850rwhp03monster

And it is just generally really hard on the engine.

It certainly is.

But people do use it, and it can be used to great success.

Fastest Manual No Nitrous Ported Eaton 03/04 Cobra 9.91@138.76!!!! - YouTube

Shaun03GT · February 4th, 2012, 11:57 AM

I had it on my car, it was the n2mb wot box. I would get flames out of the exhaust onbetween shifts and on the 2 step. It was cool. But i couldn't practice enough with the no lift shift so i sold it.

2 step for a centri or turbo car would be great. But woth the right tires. No point using it on drag radials since you don't want to come out of the hole wot on DR's.

WickedSnake00 · February 4th, 2012, 12:13 PM

Did some more reading on the two step, and I see it's not just a "soft" secondary rev limiter.

The two step actually significantly retards ignition timing to ATDC. What this does re-directs most of the combustion energy from the piston (spinning the engine but at low torque) out the exhaust valve. This means you get a significant amount of energy into the exhaust to drive the turbo with higher drive pressure. Unfortunately it also creates much higher EGT's which is not friendly to turbines or valves.

One thing I saw they did to lower the in cylinder temps to prevent pre-ignition (dieseling) is to artificially richen the mixture. This combined with ATDC timing causes incomplete combustion and excessive raw fuel into the exhaust. Not friendly for cats.

I also wonder if all two steps use this technique, or if some are in fact just a soft rev-limiter. Non-turbo applications would not benefit from the spooling characteristics of ignition retarding. With any NA or S/C application they only need the RPM part.

sillyrabbit0420 · February 4th, 2012, 01:31 PM

...Man. I wish I had Nickleback airbrushed on my car.

I'm not familiar with the aftermarket 2 step products or how they function. Just never been interested in them. Caleb at Fastlane in NC programmed a 2 step into my tune. So there's an option instead of spending the $$$ on those products.

I've never messed with it much, but it's fun for scaring ricers, and you better be prepared to shift into second real fast.

mustanginky · February 4th, 2012, 01:37 PM

a 2 step is pretty hard on a blower belt too if i'm not mistaken. i used to use the sct 2 step, but realized it cuts fuel which is no bueno for a blower car. at least that's how it was explained to me.

sillyrabbit0420 · February 4th, 2012, 01:43 PM

Originally Posted by mustanginky

a 2 step is pretty hard on a blower belt too if i'm not mistaken. i used to use the sct 2 step, but realized it cuts fuel which is no bueno for a blower car. at least that's how it was explained to me.

I don't doubt that a bit. It's also hard on tires since I'm running 4.10s.
My car isn't a drag car, it's just a fun car to drive. So the 2 step is just a neat feature if I'm out on a back road and want to scare the shit outta whoever's sitting shotgun.

Also, I wanted to bring it to attention that a tuner can program it into the car.

mustanginky · February 4th, 2012, 01:52 PM

Originally Posted by sillyrabbit0420

I don't doubt that a bit. It's also hard on tires since I'm running 4.10s.
My car isn't a drag car, it's just a fun car to drive. So the 2 step is just a neat feature if I'm out on a back road and want to scare the shit outta whoever's sitting shotgun.

Also, I wanted to bring it to attention that a tuner can program it into the car.

if you're using an sct tuner you can do it yourself as well by adjusting the parameters.

y2k02 · February 4th, 2012, 01:58 PM

My car on the msd 2-step with transmission in neutral.

Twin Turbo 2V Mustang MSD Launch Master 2-Step - YouTube

My car on msd 2-step using the transbrake.

Twin Turbo 2V Mustang MSD Launch Master 2-Step - YouTube

BaznastyDave · February 4th, 2012, 06:56 PM

2 step sounds awesome and help with an auto to build boost but useless on a manuel or at least I think so. If you can't drive or lauch very well im sure they help though. I have used my rev limiter as a 2 step a few times at the track.

y2k02 · February 4th, 2012, 08:00 PM

2-step will allow you to launch at the same rpm every pass flat-footed.
It allows a manual turbo setup to build boost also.

86er · February 4th, 2012, 08:09 PM

Originally Posted by BaznastyDave

2 step sounds awesome and help with an auto to build boost but useless on a manuel or at least I think so. If you can't drive or lauch very well im sure they help though. I have used my rev limiter as a 2 step a few times at the track.

You are slightly backwards.

It helps more on a stick car than an auto. With an auto you can foot brake and build some boost, because of the load.

With a stick car, you cant/wont build a load until you are in gear, thats where the 2 steps helps a stick car out

BaznastyDave · February 4th, 2012, 08:13 PM

^ Forgot about boosted manuel cars. For N/A cars i think thier for sound mainly, its not hard at all to launch at the same RPM everytime. With that said though i would like a 2 step on my DD tune just for the sound of it lol

stal94gt · February 4th, 2012, 08:29 PM

A 2 step isn't as bad on a motor as it sounds. I hit full boost on the 2 step and there is a big diff in how hard my car launches. If your not running slicks at the track a 2 step is pointless

My boost gauge is in the upper right hand side

N2mb 2 step - YouTube

86er · February 4th, 2012, 08:31 PM

Originally Posted by BaznastyDave

^ Forgot about boosted manuel cars. For N/A cars i think thier for sound mainly, its not hard at all to launch at the same RPM everytime. With that said though i would like a 2 step on my DD tune just for the sound of it lol

eh it helps consitancy, if you arent launching off the rev limiter try and hold the exact same rpm every time

Shaun03GT · February 4th, 2012, 09:39 PM

Here was my car with the N2MB set at 4000rpm

03 mustang GT N2MB WOT Box - YouTube

Mustang GT N2MB WOT Box - YouTube

You can see alittle puss flame on the passenger side after I let out

February 4th, 2012, 04:22 AM	#1
04MidnightGT Hardcore Enthusiast 2004 Mustang GT 12.9 @ 111.44 Join Date: Jul 2011 Location: Wichita, KS Posts: 1,262 iTrader: 0 reviews	2 Step Question Okay well this might get some flaming but I'm trying to be serious here. I know a few people that have boosted vehicles that run a 2 step (evo, 370z tt, eclipse gsx), now when they get on the 2 step there's a huge bang out of the exhaust with some fire, is this healthy? I know that the plugs can get fouled after prolonged use but is there anything else? My understanding is that when the 2 step cuts ignition fuel is dumped into the exhaust, and when it gets hot enough the fuel simply ignites causing the loud bang/fire. Is this only because of the turbo? Will mufflers cancel out this? Will my car do this when I have my turbo in and I use my msd 2 step? Sorry for the random questions lol just curious is all. __________________ l Custom Hotside l TurboSmart l MHS l Hallman l On3 l BBK l Hellion l SCT l Flowmaster l Steeda l AEM l Tial l HPX l Hawk l Trickflow

February 4th, 2012, 04:31 AM	#2
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,191 iTrader: 2 reviews	You are throwing extra unburnt fuel into your exhaust, its just something thats going to happen. I really have no idea how much the turbo might help, if you have cats they might get damaged. Personally im a little fond of the sound of an ignition 2 step and I would just go with it. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

February 4th, 2012, 11:57 AM	#7
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,447 iTrader: 12 reviews	I had it on my car, it was the n2mb wot box. I would get flames out of the exhaust onbetween shifts and on the 2 step. It was cool. But i couldn't practice enough with the no lift shift so i sold it. 2 step for a centri or turbo car would be great. But woth the right tires. No point using it on drag radials since you don't want to come out of the hole wot on DR's. __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

February 4th, 2012, 12:13 PM	#8
WickedSnake00 MM's king of Neon's 404 - car not found 17.81@87 Join Date: Aug 2010 Location: Diesel Engine Capital of the World, Columbus, IN Posts: 7,374 iTrader: 0 reviews	Did some more reading on the two step, and I see it's not just a "soft" secondary rev limiter. The two step actually significantly retards ignition timing to ATDC. What this does re-directs most of the combustion energy from the piston (spinning the engine but at low torque) out the exhaust valve. This means you get a significant amount of energy into the exhaust to drive the turbo with higher drive pressure. Unfortunately it also creates much higher EGT's which is not friendly to turbines or valves. One thing I saw they did to lower the in cylinder temps to prevent pre-ignition (dieseling) is to artificially richen the mixture. This combined with ATDC timing causes incomplete combustion and excessive raw fuel into the exhaust. Not friendly for cats. I also wonder if all two steps use this technique, or if some are in fact just a soft rev-limiter. Non-turbo applications would not benefit from the spooling characteristics of ignition retarding. With any NA or S/C application they only need the RPM part. __________________ Official Secondhand Snake Build Thread Here Looks Like a Cobra, Sounds Like a Cobra, Tastes Like a Cobra, Not a Cobra. For Sale: P71 Interceptor motor

February 4th, 2012, 01:31 PM	#9
sillyrabbit0420 Banned from AFM member! 1999 Mustang 2v 4.6L Join Date: Dec 2010 Location: Colorado Springs Posts: 454 iTrader: 0 reviews	...Man. I wish I had Nickleback airbrushed on my car. I'm not familiar with the aftermarket 2 step products or how they function. Just never been interested in them. Caleb at Fastlane in NC programmed a 2 step into my tune. So there's an option instead of spending the $$$ on those products. I've never messed with it much, but it's fun for scaring ricers, and you better be prepared to shift into second real fast. __________________ 1999 2v 4.6L 380 RWHP/ 362 RWTQ, Tuned by Fastlane Motorsports Peace - That brief, glorious moment in history when everyone's standing around reloading.

February 4th, 2012, 09:09 AM	#4
850rwhp03monster Newbie 03 termi 10.79 Join Date: Dec 2011 Location: York, PA / West Chester, PA Posts: 34 iTrader: 0 reviews	I had this on two of my evos. It's made to launch. Mufflers won't delete it. It's made to spool your turbos for bigger turbo cars. It's HORIBLE for your turbos! Sent from my Autoguide iPhone app

February 4th, 2012, 09:10 AM	#5
850rwhp03monster Newbie 03 termi 10.79 Join Date: Dec 2011 Location: York, PA / West Chester, PA Posts: 34 iTrader: 0 reviews	And it is just generally really hard on the engine. Sent from my Autoguide iPhone app

February 4th, 2012, 01:37 PM	#10
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 4,259 iTrader: 2 reviews	a 2 step is pretty hard on a blower belt too if i'm not mistaken. i used to use the sct 2 step, but realized it cuts fuel which is no bueno for a blower car. at least that's how it was explained to me. __________________ Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

February 4th, 2012, 06:56 PM	#14
BaznastyDave MM Fanatic 2004 Mustang Join Date: May 2010 Location: NC Posts: 4,336 iTrader: 4 reviews	2 step sounds awesome and help with an auto to build boost but useless on a manuel or at least I think so. If you can't drive or lauch very well im sure they help though. I have used my rev limiter as a 2 step a few times at the track. __________________ 305/333 WHP/WTQ with CMS Stage II cams 440/552 WHP/WTQ on Spray 7.86 @ 89.1mph, 1.61 60 foot N/A 7.20 @ 98.8MPH 1.55 60 foot on spray Stock Longblock with Cams

February 4th, 2012, 08:00 PM	#15
y2k02 Hardcore Enthusiast 02 Mustang GT 9.91@133 Join Date: Mar 2009 Location: Ohio Posts: 1,307 iTrader: 1 reviews	2-step will allow you to launch at the same rpm every pass flat-footed. It allows a manual turbo setup to build boost also. __________________ 2002 GT PI heads Twin 60mm turbos Th400 6.34@114 1/8 9.99@137 1/4 http://i160.photobucket.com/albums/t...t/DSCF5654.jpg http://i160.photobucket.com/albums/t...2gt/IMG060.jpg

February 4th, 2012, 08:13 PM	#17
BaznastyDave MM Fanatic 2004 Mustang Join Date: May 2010 Location: NC Posts: 4,336 iTrader: 4 reviews	^ Forgot about boosted manuel cars. For N/A cars i think thier for sound mainly, its not hard at all to launch at the same RPM everytime. With that said though i would like a 2 step on my DD tune just for the sound of it lol __________________ 305/333 WHP/WTQ with CMS Stage II cams 440/552 WHP/WTQ on Spray 7.86 @ 89.1mph, 1.61 60 foot N/A 7.20 @ 98.8MPH 1.55 60 foot on spray Stock Longblock with Cams

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