Speed Density or Regular MAF Tune?

**ls1camino** · 01-23-2009, 05:40 PM

Torquer V.2 Cam (112 LSA)
CNC Ported 5.3L Heads Milled to 60cc
FAST 90mm Intake/TB
and various supporting mods

What do you guys think?

**0rion** · 01-23-2009, 09:26 PM

I would probably do speed density just because it would be easier........ I'm lazy that way.

It would probably run fine through the maf though. Curious to see what Frost has to say.

**mcefab** · 01-24-2009, 12:23 AM

Originally Posted by ls1camino

Torquer V.2 Cam (112 LSA)
CNC Ported 5.3L Heads Milled to 60cc
FAST 90mm Intake/TB
and various supporting mods

What do you guys think?

you could go either way , but i find going sd has big advantages ; ie smother more consistent idle , sharper throttle responce , more hp , just to name a few

cheers mcefab

**Frost** · 01-26-2009, 02:38 PM

It always depends on the setup, but sounds very likely to be a good SD candidate...

**Frans96ss** · 02-02-2009, 06:27 PM

You can prob pick up some power goin SD.... but no need in an allmotor car with a mild set up like that.

**Frost** · 02-03-2009, 06:33 AM

Originally Posted by Frans96ss

You can prob pick up some power goin SD.... but no need in an allmotor car with a mild set up like that.

For H/C setups, I favor it more and more every day...

**0rion** · 02-03-2009, 07:08 AM

Originally Posted by Frost

For H/C setups, I favor it more and more every day...

me too.....mines going back to speed density this spring. I ran SD year before last and ran the maf last year. I preferred how it ran without the maf. It just makes the light cruising and idle areas easier to nail down IMO. I'm no expert by any means....just what I experienced with my car.

**Dezert** · 02-19-2009, 04:23 PM

So what exactly does the SD do differently than the MAF?

**Hi-Po** · 02-19-2009, 04:41 PM

hmmmm.... Interesting. I really want to know more about SD tuning. Still possible with HPtuners?

**Dezert** · 02-19-2009, 04:43 PM

I Just had the SD tune done on mine today and it was done with the HPTuner. So yes that is possible. I just wanna know the difference in the tunes and why 1 is better than the other?

**mark21742** · 02-22-2009, 10:37 PM

Originally Posted by Hi-Po

hmmmm.... Interesting. I really want to know more about SD tuning. Still possible with HPtuners?

I did my SD tune with hp tuners.

I would say a good reson to go SD is the fact that you take the MAF out of the equation and (dumb down) the system, taking out more variables and its easier to force the computer to do what you want it to do vs. what it wants to do.

**Hi-Po** · 02-23-2009, 02:09 PM

Originally Posted by mark21742

I did my SD tune with hp tuners.

I would say a good reson to go SD is the fact that you take the MAF out of the equation and (dumb down) the system, taking out more variables and its easier to force the computer to do what you want it to do vs. what it wants to do.

I have heard that also. Whats involved in "taking the MAF out of the equation" though? Or is this one of those things you should just say, wait untill you get your HPtuner and laptop?

**Dezert** · 02-23-2009, 02:14 PM

well if you or someone you know doesnt have a HP Tuner you wont be able to disable the MAF. When they disable the Maf they will reset your tables to compensate for the MAF being gone. I am really satisfied with my SD tune. The car seems so much more responsive now. Once the Maf is disabled you can just take it out of the car and run a solid hose or tube from the Airfilter to your Intake.

**Hi-Po** · 02-23-2009, 02:15 PM

Originally Posted by Dezert

well if you or someone you know doesnt have a HP Tuner you wont be able to disable the MAF. When they disable the Maf they will reset your tables to compensate for the MAF being gone. I am really satisfied with my SD tune. The car seems so much more responsive now.

I just bought HPtuners with LC-1 wideband. And a laptop.

**Dezert** · 02-23-2009, 02:19 PM

Kewl then your a step ahead of me. I cant tell you exactly what to do once you disable the MAF because I didnt program mine. I had it done by 1 of the racers here localy but I am sure someone here can tell you what to change in your tables to compensate for it.

**Bouvers** · 02-23-2009, 02:37 PM

I have a tuner here tell me that he feels safer with SD over MAF and that he runs it in his own car. I understand how it works slightly but to me fundamentaly it still doesn't make sense how only using one tool could ever be safer then using two?

I mean isn't it easier to lean out a tune when only using one sensor rather then two?

maybe I'm oversimplifying... thanks for the help.

**mark21742** · 02-23-2009, 05:10 PM

Originally Posted by Bouvers

I have a tuner here tell me that he feels safer with SD over MAF and that he runs it in his own car. I understand how it works slightly but to me fundamentaly it still doesn't make sense how only using one tool could ever be safer then using two?

I mean isn't it easier to lean out a tune when only using one sensor rather then two?

maybe I'm oversimplifying... thanks for the help.

i have a good situation for you. with the MAF hooked up the computer will take all of its fueling comands for the MAF, unless it is overwhelmingly off the charts.
i had an intake tube leak after the MAF, before the TB, it kept seeing the amount of air coming in through the MAF ad sent my A/F ratio to almost 20:1.

sealed the leak and it dropped back to 14.8:1

**Dezert** · 02-23-2009, 06:49 PM

So your saying with the SD tune you wont have that problem. Becase the comp is not reading what the MAF is sensing?

**mark21742** · 02-23-2009, 07:04 PM

Originally Posted by Dezert

So your saying with the SD tune you wont have that problem. Becase the comp is not reading what the MAF is sensing?

basicly just unplug your MAF andyou will be automaticly set into SD mode and your fueling will be determined by a preset table (VE table) based off of your MAP and TPS.
but you are going to be running in SD, you have to fine tune your VE table which in stock programing is just close but needs lots of improvement.
that is were you open up hptuners scanner, datalog, tune and repeat sevearl times till you get the base programing nailed down

**mark21742** · 02-23-2009, 07:42 PM

Originally Posted by Dezert

Kewl then your a step ahead of me. I cant tell you exactly what to do once you disable the MAF because I didnt program mine. I had it done by 1 of the racers here localy but I am sure someone here can tell you what to change in your tables to compensate for it.

all you have to do to disable the MAF is unplug it. if your intake air temp sensor is incorporated in the MAF then you have to replace it with a stand alone IAT ( know this sensor came stock on my 04 GTO, and was not built into tge MAF. I'm not sure abouy the F-bodies