IDRIVEAG8GT

Just gonna say, my G8=632 RWHP with plenty of headroom on my boosted MAF tune. So..... Go MAF. It's the icon of a good tuner.

foff667

iTrader: (2)

Fortunately for the G8 it has a 4000g/sec limit for the maf sensor, doubt you'll ever hit that.

In comparison every 97-2007 LS1 pcm had a 512g/sec limit

slow

iTrader: (7)

Scaling to get around the MAF sensor limitation in the pcm is no problem if you know what your doing, I proved that 5+ years ago to get at least the equilivent of 1024 g/sec on a "junk" 98 pcm.

The 2003-4 cobra pcm is limited to 63.9 #/minute, but yet they run 800-1000 rwhp on maf without issue due to aftermarket MAF support to get the extra range.

Ryan

69 Ghost

Scaling has been done alot longer than that even with old SD tunes. If you want proof look at the thirdgen site under Super AUJP. The hackers there overcame a BPW limit that was hardcoded into the system which caused problems with bigger cubed motors. Don't give your MAF up for the MAF limit excuse.

slow

iTrader: (7)

I'm sure its been done before that as well, I also had tested a voltage to frequency adapter to run a Ford BA2400/2800 series MAF on my car to get around the "limit" of the GM maf. Now with the ABACO mafs available to anybody as well as the card/slot style mafs, you should get able to get around the limit easily.

Ryan

CalEditor

iTrader: (1)

I have an ABACO story hehehehehehe. Not a good story

Hemi2Slo

Correct me if I'm wrong but SD tunes do not account for variations in ambient temperature or elevation do they? So a car tuned SD on the gulf coast in 80 weather won't run as good elsewhere in say 50 degree weather, or even in the same area at various temps. MAF takes into account ambient temperatures and barometric readings and adjusts long term fuel trims. That's what I've always been lead to believe anyway.

slow

iTrader: (7)

I've heard mixed reviews as well. Most people do not have the ability to build a voltage to frequency converter to run a ford maf, but the LS3 slot style mafs get some great range in 4"+ tubes.

Ryan

davidws6

iTrader: (36)

I've not been tuning long but the MAF does not read "ambient temperatures and barometric readings" .

Those are read by the MAP / Baro sensor and IAT sensor

The MAF is just a sensor for AIR VOLUME .. ie G/Sec...

A SD tune WILL compensate for both .

Now, some of this hardware on newer engines, might be different.

2xLS1

iTrader: (25)

Study up on what effects the air density that the MAF sees and report back what you find.

Hemi2Slo

I realize that the MAF doesn't read the temps and the barometric readings, but it works in conjunction with the instruments that do. I was always of the understanding that SD tunes do not take into account differences in temp and baro readings and that they were only good for the specific conditions existing when they were tuned. Now I was told tonight that they now have SD tunes that are programmed for every weather condition, but that they take a lot of time to do. Still seems that MAF is the quickest, easiest way to tune.

CalEditor

iTrader: (1)

A GM SD calibration will update the BARO at times.

macca_779

They don't take long to do at all. There is a fair bit of atmospheric flexibility in the standard tunes alone. Temp from heat soak gives more of a drift than baro does and there are custom OS's available to account for that. Plus there is always Closed Loop for those guys that can't quite get it right.

Hell the highest powered LS1's released here that were SD from FACTORY.

CalEditor

iTrader: (1)

Imagine that - A GM SD Calibration from the FACTORY.

Now why would you have to purchase a credit for that OS or one like it?

foff667

iTrader: (2)

You wouldn't, you are more than welcome to use the stock 1 bar operating system with.

We, meaning hptuners, also give the option of 2 bar, 2.5 bar & 3 bar custom operating systems which extend the VE table keeping the same resolution as stock in most cases, add a Boost VE table, real time tuning in most cases. etc. something the stock operating system cannot support. If you feel you can tune around the limits of the stock operating systems nobody forces you to upgrade to a custom operating system. We just try to make it easier for the community to tune their vehicles.

-Bill

CalEditor

iTrader: (1)

So instead of extending the MAF HPT did the VE tables? Hmm
and
Thanks for the 2 bar info. From your post I gather HPT has the copywrights to the 2.0, 2.5, and the 3.0 bar SD Cals?
That means you can not post a 2.0, 2.5, and the 3.0 bar SD Cal as a bin?

foff667

iTrader: (2)

Doubtful anyone has copyrights, we likely weren't the first to modify pcm code and definitely won't be the last.

-Bill

slow

iTrader: (7)

You actually have to purchase 2 credits to use a different OS with hptuners So the 1 credit is cheaper. lol

Ryan

slow

iTrader: (7)

436F7079726967687420466F7264204D6F746F7220436F2E20 32303038

Or translated to Ascii "Copyright Ford Motor Co. 2008" The GM does not have this in the image read from a warren or e40/38 controller, but it could still be in the pcm somewhere. Shelby does put his name in the image for the series 1 controller as well.


Ryan

CalEditor

iTrader: (1)

100% INCORRECT!

You are misreading that line.
Shelby didn't build the calibration. Shelby wasn't given CalTools to build or even alter that program. It came from Warren. I have had that calibration for years. I had information before most tuning companies did for the S1 setup. I worked next door to 1 of the investors (Mike Juneau) and I have talk to him. I have seen several S1's at his dealership.

I guess I could take a 2 bar SD tune and change the OSID to a stock OSID# and the VCM ID in a Hex Editor to the bin file.