silverbullitLS1

me and my tuner were missing with my tune the other day and tried running the car on speed density to see what would happen only to find out that with the MAF not working the TB also shuts off. So does anyone here have a vette running on speed density? just curious by the way.

99C5JA

Did you set the MAF fail frequency to 0Hz and disable the SES lights (not the codes completely) for MAF codes P0101, P0102, P0103? The only time I have had the MAF kick on reduced power mode was when I neglected to disable the SES for the listed codes.

Red99TA

iTrader: (11)

Yes you can run the vette in speed density (I am).

~JOSHUA

iTrader: (92)

I've run speed density when I was getting my short term fuel trims dialed in using what what mentioned in post #2.

Gotta set the maf to zero and set the corresponding codes to "3" (do not report) in hptuners.

silverbullitLS1

yea i dont think he tried any of that mentioned aboved but is there any advantage to running speed density?

99C5JA

On a naturally aspirated car the main advantage is you don't have to dial in the MAF after you've finished the SD tune. It eliminates another variable. The MAF is supposed to be more precise at higher RPM. Whether it's more hassle or equates to more power or better driveability is debatable. I plan on tuning the MAF, but others opt not to.

When you go F.I. I've only seen multi bar SD recommended. But judging from your sig we're talking N.A. here.

obi-1

iTrader: (1)

If you exceed your VE disable RPM with the maf failed, the car can go into reduced power mode. I learned this a few weeks ago.

silverbullitLS1

sorry it took so long to respond iv been out of town working. but my car is a 2000 FRC with stage 3 ls6 heads, whiplash 2 cam, vararam CAI, electric water pump, fast lsxr 102mm, 90mm TB, UD pulley, kooks LT's, GMS exhaust, built mn6, built diff., DTE brace, and hp tuned. Now that you know the mods would going speed density help me? any info would help thanks guys!

Red99TA

iTrader: (11)

I don't think you will gain anything going with a speed density tune over your current one. SD is just easier to tune IMO since as mentioned it takes the MAF out of the equation and allows you to run a straight pipe from the filter to the throttle body for a little less restriction.

performinnorman

iTrader: (7)

As others above has said, you can run them SD. My C5Z is tuned SD.

silverbullitLS1

well thanks guys my tuner is coming down this weekend and we are going to retune it since i just put the fast lsxr intake and were going to try the SD tune. ill let you guys know how it goes.