Quickin

What it is?

How is it different than an LS1Edit type tune?

Is it better to do it this way?


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2000 Tran Zam

iTrader: (2)

What I think happens is when you start to tune a car with a certain amount of power, the MAF cant read it past 1 bar accurate, so fuel/air combo will be a little fucked up and not as accurate making it harder to tune.

With an SD tune I think you have certain "tables" that you rely on to use instead of a device that measures air.

Im not too familiar with it, just some random things Ive heard from.

slow

iTrader: (7)

Speed Density, is where you remove the MAF, and just go by the MAP sensor, to guess, or predict the airflow coming into the motor, instead of using a sensor designed to measure airflow.

LS1 edit, HPtuners, EFI Live, Tuner Cat, and others are just different software packages that allow you to tune the vehicle. You can do speed density tuning with any of them that allow access to the VE tables.

The maf doesn't have a problem reading more than 1 bar, it is just measuring airflow. There is a pcm limit of 512 g/sec though.

Ryan

Quickin

So can I go get my car tuned using SD right now if I wanted to? It would run perfect? Figure 500/500 RWHP/RWTQ N/A.

TAQuickness

iTrader: (28)

take a look at the link in my sig.

VooDooo

I dont know why SD tuning is so rare in the US. The majority of cars tuned in Australia use this method. Some get a Maf tune first but soon upgrade to Mafless.

foff667

iTrader: (2)

my take on it is this...austrailia for one doesnt have huge variances in climate I assume, thats number one. Number two alot of cars built in austrailia come stock with no maf if im not mistaken. Number 3 cars in america might be built in canada & then sent to florida so they have to be able to run pretty much the same in all climates which is one thing SD has a slightly harder time doing in some cases.

LASTLS1

iTrader: (7)

If your running a big cam I would do it. I tried to keep my MAF last year and my car didn't do well at idle or slow speeds. I needed a SD tune!!!!

Quickin

I have a 242/242 .610/.610 114 lsa It idles like a stock LS1, zero lope, no shaking at all.

Maybe I need a much bigger cam

Phoenix 5.7

iTrader: (7)

Im running SD on my car. right now its just to get used to tuning in SD, but when i put in my cam, it will allow me to tune a bit more accurately, as long as i keep up with it.

FYI, Cyrsler doesn't have a maf on a decent number of their cars(i know the hemis). they run SD, but they also have widebands. that is what makes it work for various climates

LASTLS1

iTrader: (7)

You do! My cam was a 275-286 .735-.715 @ 112+3 . Try to tune that one with a MAF! I just pulled that one out to put a real cam in it!

koji777

iTrader: (3)

I'm currently tuning using the SD meathod. I had the car running, shut her down and went SD. I started to tune my VE tables.... done a few normal driving runs. I shut her down and she cooled off.... I took off my wideband, and thought I would continue the tuning in the morning. Next day, she started rough, really rough. I shut her down.. figured I'd tune another day.... now she won't start, seems I've fouled all my plugs... she is running so rich. As it stands, I gotta replace my plugs and mybe my 02's...... I wish I knew what I was doing!

LASTLS1

iTrader: (7)

Yea, I don't think it's so easy. If you get a good base tune I'm sure you could keep it fine tuned from there.

koji777

iTrader: (3)

Could ne1 spare a good FI base tune for a 408CI motor?????? Thanks!!

Quickin

Damn, I don't want to shake anyones fillings out. My weal link in my 436 are the heads...they're still just LS1 ported heads and a stock ported TB. If i go with a bigger cam I'd be wasting my time I think?

Is that cam in a street car? How does it run on the street?

LASTLS1

iTrader: (7)

It doesn't get driven much. Car shows, a couple local hangouts. It think the cam would be fine with a SD tune or Big Stuff. I put a smaller cam with 10 deg less duration and it was ALOT better for the street. Made more torque down low and made the same peak power. My new set up is going to be more on the wild side. We'll see. Andy.