Tuning the MAFT - Grimm

[rakkasan]

Strange, but I'll take it.

Question: When doing a light pull from 30-45mph, I'm getting 2.5v, which is good, but when I cruise at let's say 35mph, it goes up to 3.75v (or even 5.0v briefly). Is that normal?

 

[GrimJack]

Anything that is 'brief' on the vf reading is normal. Mine bounces back and forth a lot.

Remember to ignore any readings while you are decelerating.

 

[rakkasan]

Anything that is 'brief' on the vf reading is normal. Mine bounces back and forth a lot.

Remember to ignore any readings while you are decelerating.

Gotta, thanks

 

[dbsupra90]

oh you had the aux wire hooked up? if you had this enabled it will add or subtract that amount from the whole fuel trim. cool thing about it is you can use it to set up a secondary map when enabled. such as set 1 fuel trim for street driving and pump gas then enable for high boost and race gas. problem is you have to remember to change it back and forth. you could use a boost switch to auto enable aux mode at a certain boost level, but thats adding complication and something else to go wrong haha.
either way, glad you got it sorted. if you did have #4 on dont forget what you were tweaking was the wot map. you might want to go back and turn it on, 0 everything back out and reset again just to be sure.

good luck!

dave

 

[rakkasan]

oh you had the aux wire hooked up? if you had this enabled it will add or subtract that amount from the whole fuel trim. cool thing about it is you can use it to set up a secondary map when enabled. such as set 1 fuel trim for street driving and pump gas then enable for high boost and race gas. problem is you have to remember to change it back and forth. you could use a boost switch to auto enable aux mode at a certain boost level, but thats adding complication and something else to go wrong haha.
either way, glad you got it sorted. if you did have #4 on dont forget what you were tweaking was the wot map. you might want to go back and turn it on, 0 everything back out and reset again just to be sure.

good luck!

dave

Thanks for all the help, same to Grim & Cnewingham. Funny thing is, it's only temporary. I'll end up with a SAFC in the near future. If you think I have questions now..... :biglaugh:

 

[cnewingham]

I am also using an SAFC with my MAFT. you can only get the fine tuning by adding an safc. The maft is a rough tuning device and it shows from my dyno tuning sessions but it is an awesome upgrade to have. When youu get the SAFC put in and tuned you will be very happy.

 

[malloynx]

Strange, but I'll take it.

Question: When doing a light pull from 30-45mph, I'm getting 2.5v, which is good, but when I cruise at let's say 35mph, it goes up to 3.75v (or even 5.0v briefly). Is that normal?

yes. on my wideband i'll see 18:1 on the deccel. it's completly normal

 

[bbaacchhyy]

Been watching this thread guys, and am glad it is sorted and have learnt heaps from it.

Quick question though, how much benefit over the MAFT will the SAFC give ? Just better/finer mixture control or what ?

Cheers

Michael B

 

[Orion ZyGarian]

Just more places to specifically tune your fuel ratio

 

[bbaacchhyy]

Just more places to specifically tune your fuel ratio

If that is all, why bother with the extra expense and mucking around ?

 

[cnewingham]

because it is all about tuning my friend!!!!

 

[GrimJack]

Tuning is a remarkable thing - it can make or break your car. Being able to tune to a more precise level is a very good thing, especially when you are aiming for higher than stock horsepower numbers.

 

[dbsupra90]

i didnt care so much about the tuning aspect of it, but it is a benefit. big reasons for me were getting rid of the afm for more flow, cleaner design and bigger filter. also, i can blow off my ic piping or not even have them connected and drive my car just fine. a few others, can run shorter isc line (one less thing over the motor), "supposedly" quicker spool and hp, and finally no open vent bov stall.
mind you sev of the benefits above are from running blow thru only. otherwise its not much more than a fancy adjustable lex afm (which in its own right is nice if you have stock afm and no afc).
i think we need to compile some maft experiences, tuning and setup notes again. most of the good info was lost from the hack.

dave

 

[rakkasan]

i think we need to compile some maft experiences, tuning and setup notes again. most of the good info was lost from the hack.

dave

I think that's a great idea. IMO, it should be segmented by application. Draw thru vs. Blow thru, standard setting vs SAFC settings, ect.

 

[Orion ZyGarian]

Well any day now I should have enough money to get my MAF-T...I'll be whoring this portion of SM most definetly, as I'll be running blow through with no SAFC

 

[cnewingham]

I'll be running blow through with no SAFC

invest in the safc especially when setiing it up in blow thru. In draw through the maft is more of a plug and play item with minimal adjustments needed but in blow thru it is a different ball game.

 

[Orion ZyGarian]

I'll set it up and see how had it is. If it is as bad as you say (I hope not ), I'll just switch back to crappy-through then

 

[cnewingham]

why not just hook up an safc too?

 

[Orion ZyGarian]

I'm not made of money

The MAF-T is a cheap way to manage A/F, and I'm saving up for it, meaning I dont have much money to use for stuff! I just dont think it'd be worth it...I'd already have one way of managing fuel and as long as it doesnt spike lean or rich I think I'll be okay for now.

 

[yannis-supras]

This is very valuable information indeed, thanks a lot guys. I'm seriously considering going the maft way instead of a lex afm. My main concern is fuel cut. I was thinking of a standalone so as to be able to tune/set the fuel cut by will, not eliminate it. That would take a lot of money saving that I may do with out for the 500rwhp goal that I've set . The maft alternative is obviously a far better alternative moneywise just for that.
I've read that Grim manages to tune out fuel cut but could anyone clarify on this matter? Can fuel cut be set at will with the maft (and maybe SAFC if necessary) and if not when does it start to be a limitation power or boost wise?