writeup: MAFT Pro install for 7M-GE

[CRE]

If you use the 3" MAF is it basically a plug and play? Or is there still some tuning involved?

Depends on how you want to set it up. It should run fairly close to stock when dropped in to a stock N/A. If the stock O2 sensor is left in place and connected the only thing to keep an eye on would be the AFRs in open loop.

In your case, there'd still be quite a bit of tuning involved.

 

[AJ'S 88NA]

Depends on how you want to set it up. It should run fairly close to stock when dropped in to a stock N/A. If the stock O2 sensor is left in place and connected the only thing to keep an eye on would be the AFRs in open loop.

In your case, there'd still be quite a bit of tuning involved.

Because of the Mods I have I presume?
Question Open loop and Closed loop in simple terms because you know I'm a simple guy:biglaugh: I think I've tried to consume too much Maft-Pro stuff and have a brain loop.
Thank you sir.

 

[CRE]

Because of the Mods I have I presume?
Question Open loop and Closed loop in simple terms because you know I'm a simple guy:biglaugh: I think I've tried to consume too much Maft-Pro stuff and have a brain loop.
Thank you sir.

Mainly because of the MASSIVE injectors you're using.


In Open Loop the ECU (or MAFT Pro in my case) isn't adjusting the fuel supply in order to maintain a given AFR (14.7 for example). Closed Loop is where the ECU adjusts the fuel supply to maintain a stoichiometric AFR using the signal from the O2 sensor. With the MAFT Pro PT and AFR Tracking would qualify as Closed Loop.

With the stock O2 sensor disconnected you're basically forcing the ECU to run in Open Loop.

Where I to refer to Closed or Open Loop when you and I are discussing tuning, I would be referring to whether or not the MAFT Pro's PT or AFR Tracking are active.

This thread gives some more conditions which effect whether or not the stock ECU is running in open or closed loop.


Brain Loop? :runaway: That sounds like trouble.

 

[suprarx7nut]

Thought I'd add my perspective on CRE's MAFT Pro set up.

I've driven half a dozen mkiii N/A's in the last year(mostly stock) while trying to buy one and I can easily say his set-up has got 'em beat by quite a bit. Its hard to say how much the MAFT Pro has contributed to the gains, but I did drive it once while he was tuning. How far along in the tuning he was, he will have to add.

First impression was that it was much more responsive and pulled more consistently through the rpm range. The consistency in the power band seemed much better than the others.

Last weekend I had the opportunity to witness what a full tuning can really do. Biggest improvement over mine and the other N/A's i've experienced is that CRE's pulls harder and harder and doesn't let up until you decide to let off or shift. The rest seemed to pull harder up to about 4000 then level off. That was my most notable difference, but it also seemed to have zero hesitation. All the torque is right there if you're above 2000. Step on it and go. I'm sure if i spent 15 minutes in mine, then 15 in his, I'd be able to rattle off 10 other small differences in the feel, but those are the main points.

Aside from that its just so damn sweet to be able to track all the data your engine is throwing out to the ECU(or MP).

Next time we meet up, CRE, I want to see some charts

 

[Tire Shredder]

if you can't afford a dyno, hit the track for $10 and get us some MPH numbers! it sounds like a great modification. Although, I think I want some camshafts installed first :evil2:

 

[Illusive MA70]

ok, So I guess I will try to research which LS-1 MAF I need, I called Chevy and they looked one up off a 99 something for like $200, that's why I am wondering which application is cheapest and correct for our cars.

 

[CRE]

ok, So I guess I will try to research which LS-1 MAF I need, I called Chevy and they looked one up off a 99 something for like $200, that's why I am wondering which application is cheapest and correct for our cars.

http://www.fullthrottlespeed.com/it...317C9B}~ic~02225180303~eq~0223inchmaf~Tp~.htm

 

[CRE]

if you can't afford a dyno, hit the track for $10 and get us some MPH numbers! it sounds like a great modification. Although, I think I want some camshafts installed first :evil2:

With a 3.93 diff 1/4 mile times wouldn't really help much... that and the fact that I doubt I'd do very well (not much of an off-the-line kind of driver).

I don't think more aggressive cams would make for too great of an improvement, although I must admit I have been growing a bit curious.

 

[AJ'S 88NA]

ok, So I guess I will try to research which LS-1 MAF I need, I called Chevy and they looked one up off a 99 something for like $200, that's why I am wondering which application is cheapest and correct for our cars.

I've got a used one I was going to use looks good , I decided to go Speed Density. It's off a 99 LS-1

 

[AJ'S 88NA]

With a 3.93 diff 1/4 mile times wouldn't really help much... that and the fact that I doubt I'd do very well (not much of an off-the-line kind of driver).

I don't think more aggressive cams would make for too great of an improvement, although I must admit I have been growing a bit curious.

With other Mods. it makes a difference, just the cams alone I agree with CRE, not much difference.

 

[CRE]

I've got a used one I was going to use looks good , I decided to go Speed Density. It's off a 99 LS-1

Is that a 3" or a 3.5"? If it's a 3" do you recall what car it's from?

 

[AJ'S 88NA]

Is that a 3" or a 3.5"? If it's a 3" do you recall what car it's from?

It's a 3.5" and the guy I got it from just said it was from a LS-1 motor used on many 99 models. I can get some pics up if it will help.

 

[CRE]

I don't think we need pics. I'd just like a list or which vehicles used 3" and which used 3.5".

 

[Illusive MA70]

I've got a used one I was going to use looks good , I decided to go Speed Density. It's off a 99 LS-1

What are you asking for it?

oh and CRE Thank you for the link. The 3.5" is less expensive than the 3", I wonder why?

 

[CRE]

The 3.5" is a more common upgrade.

Be forewarned that with the 3.5" you're likely to run quite rich. I've already posted details about this and a possible solution to avoid it in this thread. If you have a wideband and will be tuning the system, then you needn't worry about it as you'll be tuning out the extra fuel.

 

[Illusive MA70]

I am going to be guessing that the 3.5 is off of the later year LS1 like 2001, according to some info I read in 2001 the LS1 received a higher flowing intake.....thats a guess though, based off this. http://en.wikipedia.org/wiki/GM_LS_engine#LS1

 

[Sl1dewaysSupra]

My quick thoughts and impressions on CRE's setup vs. my stocker.

After driving CRE's car during it's many stages it gets stronger and stronger each step. When he let me drive it in one of the first stages I only noticed better throttle response and higher end torque.(This was before it was tuned at all and his 3.91 diff vs. my 4.30.) It got better from there.

Flash foward to a few nights ago and a tuned car. Hands down this is the funnest N/A I have ever driven. Even the neighborhood driving was a joy. For the simple fact that you know what is in store if you press the loud pedal to the floor! It rev's super easily and precise/quickly. The car pulls hard no matter what gear or RPM it's ready and egar to do more. Keep in mind this is a N/A! Of course there is no huge kick after 3000 RPM, it is even better IMHO. Looooong steady and even pulls. I like the power delievery better than a stock turbo. All in all it is a stronger, rev happier, torque-ier and whatever -ier you can think of. My kudos to a true pioneer and "out of the box" thinker.

 

[AJ'S 88NA]

My quick thoughts and impressions on CRE's setup vs. my stocker.

After driving CRE's car during it's many stages it gets stronger and stronger each step. When he let me drive it in one of the first stages I only noticed better throttle response and higher end torque.(This was before it was tuned at all and his 3.91 diff vs. my 4.30.) It got better from there.

Flash foward to a few nights ago and a tuned car. Hands down this is the funnest N/A I have ever driven. Even the neighborhood driving was a joy. For the simple fact that you know what is in store if you press the loud pedal to the floor! It rev's super easily and precise/quickly. The car pulls hard no matter what gear or RPM it's ready and egar to do more. Keep in mind this is a N/A! Of course there is no huge kick after 3000 RPM, it is even better IMHO. Looooong steady and even pulls. I like the power delievery better than a stock turbo. All in all it is a stronger, rev happier, torque-ier and whatever -ier you can think of. My kudos to a true pioneer and "out of the box" thinker.

So that is were he's been, out playing:biglaugh: I have to agree with you about CRE, I haven't driven his car but I can truly say that with his help with mine in setting up the Maft-Pro has been a learning experience from the start and there has not been one time that I've talked to him, I haven't learned something. Kudos II. Thank you my friend for hanging in there for me and fielding all my dumb questions. And he said I have a long way to go:cry:
As far as the tuning on my car, I am about as far as I can go without a laptop(comming soon), but so far with the Maft-Pro SD, just half-ass tuned, I can agree with Sideways about the "feel" Fantastic. It will GO RIGHT NOW and wants to KEEP GOING all the way. I can't wait to get the tune all the way right.
Thanks again CRE for all your hard work in getting the info that we need to get this setup for the NA"s.

AJ

 

[Tire Shredder]

time for a dyno visit AJ!

 

[AJ'S 88NA]

time for a dyno visit AJ!

Not until I get the laptop so I can make sure of my tune. Too hard driving and looking at the Maft:aigo: I offered to put CRE up for awhile to come help me:naughty: But he used the excuse of working or something:biglaugh: The dyno shop has a new guy and he admitted not knowing very much about the Maft-Pro, so I don't really trust that, that's why I'm going to get as close as I can. CRE said he could tune it from the Tuner-Pro downloads long distance:naughty: My butt dyno tells me another 20-25hp as it is now. :naughty: