Disable high Rev cold start

[FRSBRZGT86FAN]

Originally Posted by steve99

you need to do all tables A-F

quiet start you need to do 4 things

lower fast idle speeds
reduce the maf offset after start ingear/neutral
Reduce Post start ignition timing

and on USA roms disable P050B cel code post start ignition performance or you will get CEL light.

Does this look correct? Thanks again for helping us all! I matched the idle RPM pretty much to what @KoolBRZ has except for at temp where it idles at 800, also is the ignition timing post start ok?

[steve99]

You need a '-' minus sign in your post start ignition timing you got +4 instead of -4 :-)

your post start maf corrections look a bit agressive, it might have problems , after start on rearly cold days, not sure it never gets cold where I am.
try the ones below from wayno,s thread


do you need it to idle at 800 ?? when its fully warmed up, im back down to 700 .

[steve99]

mod your cold/warm/hot injection ration tables as per below

ie zero port in the 0.2 load column will smooth idle a lot

[FRSBRZGT86FAN]

Originally Posted by steve99

You need a '-' minus sign in your post start ignition timing you got +4 instead of -4 :-)

your post start maf corrections look a bit agressive, it might have problems , after start on rearly cold days, not sure it never gets cold where I am.
try the ones below from wayno,s thread


do you need it to idle at 800 ?? when its fully warmed up, im back down to 700 .

Originally Posted by steve99

mod your cold/warm/hot injection ration tables as per below

ie zero port in the 0.2 load column will smooth idle a lot

Thanks! I have edited my Values to match Waynos, as well as the injection ratio tables as you suggested, as for the idle stock before the edit it was at 750 RPM so I put it back to that. Also why does waynos car have -6.99 vs the -0.04 post start ignition timing I was supposed to have before? Thanks again for checking these:

[steve99]

Originally Posted by FRSBRZGT86FAN

Thanks! I have edited my Values to match Waynos, as well as the injection ratio tables as you suggested, as for the idle stock before the edit it was at 750 RPM so I put it back to that. Also why does waynos car have -6.99 vs the -0.04 post start ignition timing I was supposed to have before? Thanks again for checking these:

Its just a sound preference rearly, wayno has stock catback so does not need to dial out the post start timing as much to quieten it down, -4 just takes out a bit more of the bark, you could use +4, i tried it a while back but it sounds like crap, well on my hks catback anyway ,sounded like just holding the revs up a bit once car warm.

If you need more knock resistance above 4800 then change the pi\di ratio rpm scaling in the last two rows like waynos tables from 4800, 5200 to 7000,7200. This will hold full di to 7000 instead of 5200. Not rearly needed if you have good 93 usa fuel but works on our crap 98 and your 91

[bottle]

I will make a note for others that I noticed if I used any advanced timing at all during my cold start in cold weather, I could occasionally get knock during cold start ups (lowering the adv multiplier). I have since reverted back to a retarded post ignition start (also around -6) and lowered the cold idle RPM to max at 1100 to help keep the noise down. Due to this, I also had to reduce my MAF tables even more (or else it kinda just idles at a higher RPM anyway).

Steve, could you explain how a lower MAF offset results in it being "more aggressive"? From what I understand, it should make it less aggressive. The RPMs will dip heavily initially if the MAF offset after start is too low, but comes right back up to the desired RPM as necessary I found. Or are you saying that it may not draw enough air during initial cold start and flood/stall the engine?

[FRSBRZGT86FAN]

Originally Posted by steve99

Its just a sound preference rearly, wayno has stock catback so does not need to dial out the post start timing as much to quieten it down, -4 just takes out a bit more of the bark, you could use +4, i tried it a while back but it sounds like crap, well on my hks catback anyway ,sounded like just holding the revs up a bit once car warm.

If you need more knock resistance above 4800 then change the pi\di ratio rpm scaling in the last two rows like waynos tables from 4800, 5200 to 7000,7200. This will hold full di to 7000 instead of 5200. Not rearly needed if you have good 93 usa fuel but works on our crap 98 and your 91

I'm lucky enough to have decent 93 octane everywhere here in PA, USA so I don't feel any extra need for knock resistance however I will occasionally check the data logs from OFT to be sure in the future.

So all in all what I have looks good correct? Just loaded it onto my oft and will flash it onto the car after I install the berk muffler delete

[steve99]

Originally Posted by FRSBRZGT86FAN

I'm lucky enough to have decent 93 octane everywhere here in PA, USA so I don't feel any extra need for knock resistance however I will occasionally check the data logs from OFT to be sure in the future.

So all in all what I have looks good correct? Just loaded it onto my oft and will flash it onto the car after I install the berk muffler delete

yes looks fine

[FRSBRZGT86FAN]

Originally Posted by steve99

yes looks fine

Thanks Again! It's surprisingly easy to use romraider, so easy it might lull one into a false sense of security when messing with things

[FRSBRZGT86FAN]

Originally Posted by steve99

yes looks fine

Also another curious question, does changing the PI/DI ratio tables @ 0.20 g/rev simply make it so that only DI is used at idle? Does this help a bit o acceleration as well?

[steve99]

Originally Posted by bottle

I will make a note for others that I noticed if I used any advanced timing at all during my cold start in cold weather, I could occasionally get knock during cold start ups (lowering the adv multiplier). I have since reverted back to a retarded post ignition start (also around -6) and lowered the cold idle RPM to max at 1100 to help keep the noise down. Due to this, I also had to reduce my MAF tables even more (or else it kinda just idles at a higher RPM anyway).

Steve, could you explain how a lower MAF offset results in it being "more aggressive"? From what I understand, it should make it less aggressive. The RPMs will dip heavily initially if the MAF offset after start is too low, but comes right back up to the desired RPM as necessary I found. Or are you saying that it may not draw enough air during initial cold start and flood/stall the engine?

yes -4 seems to be a good compromise for startup, normal idle is about +11

the maf offset adds fuel to heat up cats its probably possible if maf offset is left high ie lots more fuel and advanced timing it may knock but seems unusual at such low rpm.

like most stuff it a bit od a balancing act, just make small changes and log results.

true if you dont back off the maf offset a bit it will jyst idle high anyway.

you need enough maf offset to tichen it up a bit for rearly cold mornings else it may stall

[steve99]

Originally Posted by FRSBRZGT86FAN

Also another curious question, does changing the PI/DI ratio tables @ 0.20 g/rev simply make it so that only DI is used at idle? Does this help a bit o acceleration as well?

Yes in that table 0% means 0% port and 100% di.

except at startup i believe engine uses 100% port for initialt startup\warmup then start to use those tables for pi\di split.

the idea behind using 100% di was to stop the two intecion system having to inject small amounts of fuel, just let one system do it all for more idle stability.

[BRZ_F]

Originally Posted by steve99

You need a '-' minus sign in your post start ignition timing you got +4 instead of -4 :-)

your post start maf corrections look a bit agressive, it might have problems , after start on rearly cold days, not sure it never gets cold where I am.
try the ones below from wayno,s thread


do you need it to idle at 800 ?? when its fully warmed up, im back down to 700 .

Hello! I just installed a Gruppe-S UEL header and flashed Shiv's Stage 2 UEL e85 tune and I'd like to disable the high rev cold start but I can't seem to find the "maf corrections after start" tables to do so. I'm on OTS v2.070. Is there a different way to do so on this version of the tune? NAy help is much appreciated!

[steve99]

Originally Posted by BRZ_F

Hello! I just installed a Gruppe-S UEL header and flashed Shiv's Stage 2 UEL e85 tune and I'd like to disable the high rev cold start but I can't seem to find the "maf corrections after start" tables to do so. I'm on OTS v2.070. Is there a different way to do so on this version of the tune? NAy help is much appreciated!

Yes those tables are not defined in the standard oft defs if you are using V2x tunes you can use wayno's defs for oft tunes see bottom of linked post below

http://www.ft86club.com/forums/showthread.php?t=83945

once you load up wayno's defs for your rom those tables will show up in romraider

The tables are always in the tune its just that those tables were not indexed in the standard oft definitions