Is anyone running a OBD2 60* in speed density?

[Bridgetown]

I have been doing some research lately on converting my 2002 GA 3400 to speed density. Just curious if anyone on here has actually done this?

[3400-95-Modified]

What are your reasons for wanting to do so?

I've been running a MAF setup for a while now and I'm 100% happy with it, very easy to tune and tweak for any changes. I've also worked on a SC'd 3400 with a MAF and have no issues with that setup either.

[caffeine]

I find speed density usually results in better throttle response at the expense of cold-start drivability. Depends on your preferences I guess.

[Superdave]

I don't think he wants to try to figure out how to run 6 MAF's

[caffeine]

Aaahhhh . ITBs I take it.

[Bridgetown]

Aaahhhh . ITBs I take it.

Precisely.

I have been talking to some knowledgable 60* tuners, none of them are aware of anyone running my ecu in speed density. I am really thinking going to obd1 might be the better solution.
Just looking for some advice from other more experienced people before I dive into this project

[caffeine]

Can you just enable speed-density mode? If so, its probably easier to try tuning that way than to go straight to OBD1, which can always be done anyway.

That being said, since you have to run speed density anyway the OBDI computers are a lot more versatile as there are plenty of modified bins out there for increased tuning ability.

[Bridgetown]

I was hoping to find out if running my ecu in speed density is even possible first before dropping $500 on HP tuners. I have most of the hardware and software and a base tune for a OBD1 3400. I would rather run the OBD2 if I could, but I'm not opposed to going back to OBD1. Anyone out there have experience with my ecu serv. #12209614?

[3400-95-Modified]

I know it's been done since that's what RSM did to the ECU's that were made for their SC kits... I think all they did was unplugged the MAF and disabled the codes for it. I'm not 100% sure if that is reverting it 100% back to speed density though or if it's putting it in some sort of limp mode where it just relies on speed density calculations to run.

There is no Enable/Disable speed density check box...

[Bridgetown]

Well, I'm kinda stuck now. I've had a couple of knowledgeable tuners tell me running my ecu in speed density is a bad idea.
That's interesting about RSM though. Any more advice?

[3400-95-Modified]

RSM was a hack job deal, so I would agree with the other knowledgeable tuners... I think if you have OBDII run a MAF, if you want speed density, move to stand alone or OBDI, it just makes more sense.

[caffeine]

Weird. LT1s use a MAF normally but tons of people run them in speed density mode. There is a flag to enable speed density though. Maybe there is in the 3400 PCMs too; its just not accessible with current software?

[robertisaar]

i've seen quite a few LSx PCMs/vehicles run without a MAF as well.

i'd say it probably is just a lack of it being understood/shown in the tuner programs.

[3400-95-Modified]

i'd say it probably is just a lack of it being understood/shown in the tuner programs.

I wouldn't argue that statement in the least, but unfortunately that's what your stuck with when no one cares about the OSID or application you have to use. LSx get's tons of attention, I got a straight statement from HPTuners that they will NOT investigate the 97 Venture or Monte tables anymore because they don't want to waste the time... therefore I did not purchase a HPTuner.

[robertisaar]

not that i'm saying it's the end-all solution, but in tinytuner....

97 lumina (09355440) Fuel->MAF->MAF Failure Airmass Calc Mode

3 options are shown, including speed-density and alpha-n.

at that point, i imagine you could just either set the MAF min/max fail frequencies to something that will cause the alternative fueling mode to be entered, or just simply disconnect the MAF sensor and it should jump to that.