~BuMps AloT~

iTrader: (5)

Hey guys I was wondering what the advantages are to having a speed density tune vs keeping the MAF are?

My car currently is speed density tuned (mail order pig rich) all mods to the car are listed in my garage (forged 383, ported tfs heads, LE 236/242 cam). I am going to be having it dyno tuned in spring. So i would like to know which one is better to go with and why.

Thanks
Devin

MattSapp95_T/A

iTrader: (35)

Hey bud from what I have been told

If you're not boosted, there's no reason to run speed density. People switch to speed density because they're pushing more airflow than the MAF can read

~BuMps AloT~

iTrader: (5)

See thats what I was thinking. The guy that tuned the car said that he only does speed density tunes and wouldn't have anything to do with the MAF...

ThreeHonks

iTrader: (10)

I have an open loop speed density tune on my N/A car. runs great.

This looks like a good discussion. what kind of tune does everyone run on here?

ZGOBYBY

iTrader: (14)

More input please from other people, I am interested in this for my buddy and my project car.

mguidry629

iTrader: (6)

Isn't MAF the "newer technology"? I would think GM had a reason for switching to MAF. And it seems much easier to tune if your N/A, but I can see how it could get complicated with forced induction setups.

1badzee

iTrader: (12)

open loop maf tuned here. No o2's for me. Switched from speed density.

qc97z

iTrader: (9)

If you're not boosted, there's no reason to go speed density. Stick with the MAF and KEEP YOUR O2's. You want to have the ability to see lean conditions and check engine lights....

Wicked94Z

iTrader: (26)

speed density for the past 2 years. There's no way my **** would idle with a MAF or narrow band o2s

~BuMps AloT~

iTrader: (5)

Really haven't got a straight answer as to why which one is preferred over the other.

wrd1972

iTrader: (12)

Wicked said it. Some motors with really agressive cams dont idle well with MAF. A SD tune seems to be more friendly with more agressive combos. Also many have found they they can get just a little more power with a SD tune. Also some find it easier to tune becasue they can use VE master.

My personal experience, I gained around 8RWHP with SD but I prefer the MAF tune because it should provide better mileage and better adapt to climate changes. Also I dont have any idle issues so the MAF works for me.

Wicked94Z

iTrader: (26)

the SD tune is crisper, it's easy as hell to tune, you can run an open tb, and it's one less sensor to deal with.

ThreeHonks

iTrader: (10)

when tuned properly on a setup that needs a SD tune there is an advantage to be had.

The reason for me going open loop was because at idle the O2's would see fresh air with a free-flowing exhaust and a cam with large overlap. The MAF was not liking the overlap either

A SD tune also lets you attack the VE tables, I dont see myself ever switching to a MAF-based in any car I own

MEAN LT1

iTrader: (2)

Ive tuned both and didnt gain a thing going from one to another. The only reason I see going to SD is if your FI or a all out race car. Some will say that the maf doent like big cams. It can be tuned but requires some time. I will agree that SD is easy as hell tune but I prefer using the maf.