2-Step in HP tuners???
12-19-2006, 03:39 PM
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2-Step in HP tuners??? I posted this up a long time ago and did not get much back on it. I figured I would try again since it has been out for a while with lots of people doing new and different things with it.
My question is, is it possible to trick the PCM into performing a 2-step function? On HP tuners forum a guy with a V6 car did it. How about us V-8 cars? My thoughts were to tap into the NSS pinout in the PCM and turn on the PRNDL and setting rev limiters acordingly. Any thoughts or suggestions? Maybe experiences? There has to be a way to make this work. This would be for an M6 car.
My question is, is it possible to trick the PCM into performing a 2-step function? On HP tuners forum a guy with a V6 car did it. How about us V-8 cars? My thoughts were to tap into the NSS pinout in the PCM and turn on the PRNDL and setting rev limiters acordingly. Any thoughts or suggestions? Maybe experiences? There has to be a way to make this work. This would be for an M6 car.
12-20-2006, 12:06 AM
#3
Originally Posted by Shawns30thannZ28
by 2 step u mean igniting fuel in the exhaust to spool the turbo early right? or am i on a different page
12-20-2006, 12:34 AM
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Originally Posted by 02 BLK WS6
Different page bro. I don't know about this though, there are a couple of guys running a Harlan 2 step around STL.
2 steps are only for turbo cars thought right? its my understanding that it is used to spool the turbo while the car is at a stand still.
::edit::
Originally Posted by MrDude_1
no fuel = no burn in the exhaust... no burn = slower/less turbo spooling...
with a conventional 2step, the fuel ends up burning in the exhaust, so the volume in the exhaust is still like WOT, keeping that turbo spooled up good..
this 2step only sounds like a solution for N/A guys.. mostly manuals, but i suppose someone with a large stall and a transbrake could use it to launch from a less then true stall RPM...
with a conventional 2step, the fuel ends up burning in the exhaust, so the volume in the exhaust is still like WOT, keeping that turbo spooled up good..
this 2step only sounds like a solution for N/A guys.. mostly manuals, but i suppose someone with a large stall and a transbrake could use it to launch from a less then true stall RPM...
Last edited by SShawn; 12-20-2006 at 12:46 AM.
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01-04-2007, 05:46 PM
#10
A good two-step cuts spark randomly to multiple cylinders to maintain a desired rpm, even at WOT. The reason for varying cylinders is to keep from loading up/fouling out cylinders during this process. You can achieve a half-assed two step with the P/N rev limit fuel cutoff in HPT, but the response time is so slow that you can't maintain a steady rpm. For N/A cars, a two step can provide a consistent launch rpm. For centrifugal cars with an auto, it can keep from pulling through the converter's stall speed and overheating the tranny at the start line. For turbo cars, having the throttle wide open allows the turbo to build boost, which is enhanced by the raw fuel expanding(burning?) in the exhaust pipe. A good spark cut rev limiter cannot be used on a car with cats, as they will quickly overheat and come apart.
