transamws6_97

iTrader: (5)

I'm getting a street tune tomorrow. I planned on keeping my maf but I know some of the local guys are running speed density tunes on the lt1s and ls1s. What are the benefits to running speed density over a regular maf tune?

infinitebird

iTrader: (11)

for your car, none.

Easier for some turbo setups, but other than that, stick with the maf.

transamws6_97

iTrader: (5)

what about some cammed cars?

infinitebird

iTrader: (11)

Put it this way unless you are making at least 500rwhp, stay with the MAF.

MEAN LT1

iTrader: (2)

I agree, there nothing wrong with tuning with the maf.

transamws6_97

iTrader: (5)

okay one last question...do i need to have a wideband o2 sensor for street tuning? someone said i should have one but i dont...would the tuner have one and just be able it put it in?

1badzee

iTrader: (12)

I have a speed density and i am well under 500hp lol.. i guess you're asking in terms of swapping?

transamws6_97

iTrader: (5)

nah im not gonna swap i'm going w/ maf tune but my friend who has a cammed ls1 thinks he needs a speed density tune for a car he never races just drives around the street

96lt1m6

iTrader: (31)

Tell him N/A cars still benefit from a maf,now if he had a turbo he should really consider SD tune cause the turbo will exceed the mafs capabilities at 3/4 throttle...

infinitebird

iTrader: (11)

To do it right, yes you need a wideband. Although a good tuner can typically get you somewhere in the general optimal range if your O2s are working properly.

Dragframe

iTrader: (14)

Speed Density on the lt1 pcm is a joke anyways. On the ls1... its easy and works good. At a certain point (hp level, boost level.... just depends... its all about CFM!!!) you will max out the MAF. At that point you need to get either a MAF that reads more (cfm) or go SD.

Speed Density figures fueling using an algorithm and feedback from MAP, TPS, RPM, intake temp, and motor temp. Use of o2 sensor depends on tuner and goals with the car. IMHO speed density would have been a better move than the maf in cars mainly just cause of cost (dont have to pay for a MAF on every car).

transamws6_97

iTrader: (5)

yeah after talking to my tuner he said if you have ls1 speed density is the way to go. I just had a regular maf tune and I'm happy