2 Step with Hp Tuners
2 Step with Hp Tuners I read this and I didn't want to hijack his thread so I started this one. Is it possible to program in a 2-Step using HP Tuners? And how do you do it?
https://ls1tech.com/forums/pcm-diagn...hp-tuners.html
https://ls1tech.com/forums/pcm-diagn...hp-tuners.html
Simply set your 2-step RPM in the P/N column. When the top clutch switch (rest position) closes then the P/N limit will energize until you return the clutch pedal to the rest position. Works at both launch and shifting, for flat-foot throttle shifts.
No there is no wiring at all. Just set those values in HPTuners. If it doesnt work then get up under your dash and make sure the clutch pedal is tripping the upper clutch switch.
honestly, i wouldnt use that as the ls computers cut fuel for the rev limiter. thts just me though. there was a discussion about a possible launch controler with hpt but the consensus was its bad juju on anything but an n/a setup and even then i probably wouldnt do it.
Yes it's fuel cut, but it's not going to hurt anything. Just because your wideband show's lean when you are using it doesnt mean it's actually lean! When it cut's fuel it cut's the fuel for that entire stroke which means it's only pumping the cylinders full of air. Air will not combust without something to burn. When the fuel is turned back on it will give it the amount of fuel it's supposed to pending your tune is right.
You wouldnt want to use this with nitrous unless you have a deactivation switch for the nitrous on the clutch pedal.
You wouldnt want to use this with nitrous unless you have a deactivation switch for the nitrous on the clutch pedal.
It worked great at the track Friday night. I didn't actually launch with it as a 2-step, but with the P/N limit set at 5,000 rpm, I flat footed the throttle for the entire 1/8 mile (nice flat TPS scan). It makes shifting a little quicker and less effort.
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I don't see this as being real effective (for 60fts) in comparison to a real 2 step launch controller. You want the 2 step to shut off as soon as your clutch pedal moves off the floor, not when it's fully released. Plus the fuel cut is super slow in comparison to an ignition cut. Maybe a decent shifting aid, nothing more. Just my $.02.......
And I agree with jmm98LS1 - the P/N RMP limit can be helpful with shifting and holding WOT, but it is too slow to be an effective 2-step. It might win you some points at a street cruise-in or stop light though.
A good antilag setup would be to use the Lingenfelter box. But also to add to it's affect you could use the Idle Spark tables to retard the timing even more to help create big boost! Basically to make the idle tables stay enabled at WOT on the launch control you would set the main spark min TPS value to 100% and then set the Max Speed to 1mph so that once you take off it disables instantly.
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Joined: Feb 2009
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From: Salem, OR
when i set mine, it will limit when i edit the RPM vs Gear table and change the P/N setting, but it limtis the rpms all the time, even while in gear and driving.
i only edited the P/N table on the RPM vs Gear. editing the P/N fuel cutoff doesnt do anything.
i only edited the P/N table on the RPM vs Gear. editing the P/N fuel cutoff doesnt do anything.
Last edited by Fury_786; Jun 7, 2010 at 09:22 PM.
If it does it all the time then your PCM isn't seeing the clutch switch tripping when the clutch pedal is all the way up. I had a buddies car we did this on and that was the case on his. It works like a charm on my 2000 Z28 but honestly I don't like it at all because I find myself on the flat foot shifting waiting for the fuel to come back on and it actualy slows my car down because the fuel doesnt come back on quick enough.
