MAF tuning with flow bench??

[SweetS10V8]

Is there a way to use a flow bench to crate an accurate MAF Sensor calibration (B5001)

I have access to a SF-1020 flowbench and an adjustable voltage power supply and want to take my entire intake system and hook it up on the flow bench. But I dont know what I would have to do to make it work correctly.

[Mr. P.]

Well that's how GM does it! You need more than the MAF though, you have to assemble the actual CAI + filter + MAF + tube to the TB and flow the whole assembly; once you hit a frequency listed in the MAF table then you note the measured airflow at that frequency. In theory!

Mr. P. :)

[SweetS10V8]

Yeah, I knew Ill have to have the entire intake system.

Sounds like I'll need two or three adjustable power supplies. On to drive the electronic throttle body and another to power the MAF. The third to supply a 5v reference signal to the MAF?

As I record the HZ through efi live

Ill have to figure out what pins need power/ground on the throttle body.

Ive built my own CAI and also changed to a FAST LSXR 102mm Intake So Im sure I need it!!
http://inlinethumb31.webshots.com/37790/2678760500060344825S600x600Q85.jpg (http://rides.webshots.com/photo/2678760500060344825iVFYqQ)

[joecar]

What car do you have there...?

[SweetS10V8]

What car do you have there...?A Sweet-S10-V8..... :hihi:

6.0L LQ9
CNC LS3 heads
Comp Cam 219/235 .607/.621 113+5
FAST LSXR 102mm Intake
1 3/4" Longtube headers
Mandrel bent exhaust

Ive done all this new stuff and had a friend help me get in the ballpark for idling. Im still trying to learn about all the small detail work involved.

Luckily I also have a free chassis dyno too, with eddy current, to really get my AutoVE tuning correct along with doing my MBT timing tuning.

http://inlinethumb62.webshots.com/32701/2769341510060344825S600x600Q85.jpg (http://rides.webshots.com/photo/2769341510060344825laadpL)

[Frost]

Nice!!

If you have access to that though (dyno with LC), why would you not just use it to calibrate the MAF rather than try to do it on the bench ?

[Mr. P.]

Very cool man :thumbs: What did you use for headers? We had a bastard of a time with the exhaust, and that was using manifolds off a '99 F-body.

Here's ours we did this last May, my partner built it for his GF so she can daily-drive it to/from school! We were able to get it done in 2 weekends and after selling the original V6 the total outlay was $1500. Motor is a 5.3L with Z06 cam & springs & fresh 4L60. It's pretty funny when you start it up and it sounds like a Camaro rather than an S10 lol.

http://www.hp-motoring.com/Projects/LS-10/_DSC0686.jpg

http://www.hp-motoring.com/Projects/LS-10/_DSC0157-w.jpg

Mr. P. :)

[Mr. P.]

...Luckily I also have a free chassis dyno too, with eddy current...
Wait a minute - if you have a steady-state dyno then recalibrating your MAF is easy, you don't need a flowbench. Get your SD tune spot-on, so you know it's right. Then re-enable your MAF and using the scan tool get a map going of the BENs (correction) versus MAF frequency... sorry to not be specific here as I have not done this myself, I'm still learning SD tuning; but you already have what you need to dial-in the MAF.

Mr. P. :)

[SweetS10V8]

Nice!!

If you have access to that though (dyno with LC), why would you not just use it to calibrate the MAF rather than try to do it on the bench ?Im new at this, I havent calibrated a MAF ever. Ive just gotten into the AutoVE tuning on the street, havent been on the dyno yet with to tune this setup beyond making a quick power pull or two.

[joecar]

lol... I should have known...:cheers:

[joecar]

+1 on calibrating MAF using AutoMAF procedure (as said by Frost and Mr.P above)...

AutoMAF is same as AutoVE but with MAF enabled, B0120 set to 400 rpm, using BEN map that looks like B5001.

:)

[joecar]

If you find too much variation/oscillation in MAF output when it should be steady, move it further away from the bend in the plumbing.

[joecar]

If you have a good VE, then while MAF is still disabled log DYNAIR (g/s) into a B5001-like map and compare with MAF table.

[SweetS10V8]

Thanks for the tips!!

I tried to keep the MAF far away from the filter for the same reasons. I figured the air should be straighted out the farther I put it away from the filter. I never thought of the bend affecting it. I have extra silicone tube thankfully since I had to buy two feet.

[macca_779]

Your theory is right in that you should be able to calibrate a MAF and entire intake setup on a flow bench. But the reality is as GM has proven, that once it all goes together it doesn't work out quite as accurate as it should be. Far better off to do as joe mentioned and force the MAF 100% and do an AutoMAF map to dial it in.

[Redline Motorsports]

If you find too much variation/oscillation in MAF output when it should be steady, move it further away from the bend in the plumbing.

Exactly. The worse thing is a "noisy" signal at low MAF hrtz. I actually will dial in a MAF before we do big motor work as the low hrtz area is very smooth. Once you stick a big cam in the engine the low speed signal goes to crap.

Using the engine for a air dyno is a piece of cake. You'll spend more time screwing around with that flow bench vs. the 20 minutes it will take to get the MAF dialed in on the car. Just make a error factor and log it over MAF hrtz and you'll be done real quick!

Howard