Ideal fuel/ air control

[Tictakman]

im on the quest to find the best fuel and air control setup without going to a complete management system. ( i hear that you cant pass emissions)

im looking to get around 400+ hp and from what ive been reading i think a safc II will be ok for the job.

i have a walbro fuel pump and im wanting to get above 550cc injectors. not sure which ones though. can a cobra maf and a safc II control the air/ fuel correctly for a good amount of tuning? or am i way off track?

also any other setups are welcome.

Zak

[IvoryJ30t]

greddy E-Manage and E-01 EBC/programmer.

also a laptop, a wideband, and an egt sensor for tuning.

[C-Kwik]

AFAIK, the SAFC and E-Manage can't compensate for the Cobra MAF directly. You'ld have to tune it manually. If you use a MAF that is supported by the SAFC or E-Manage, then the piggyback can calculate the map changes for you. At least I think this is the case with the SAFC. The E-Manage can do this for sure.

If I were looking for some 400+ HP, I'd probably use a JWT ECU and if I needed further tuning, I'd piggy back that as opposed to trying to piggy-back that much based on the stock fuel maps. Piggybacks have to fight the O2 Feedback of the ECU during closed-loop, which can particularly cause problems at high boost part throttle applications. At low to moderate boost levels, you may be able to get away with it, but at higher boost levels, you may run into issues where the piggy-back may not be able to keep the ECU rich enough.

[huguetpj]

At least I think this is the case with the SAFC.

Yes it is

[Tictakman]

ok ill look into the jwt ecu/ piggyback safc II. what injectors would be more than enough for this application. from what ive read i think i would prefer side fed to cool the fuel going in. any objections?

Zak

[andrave]

expensive though...and JWT will only tune to so large on side feeds, I think its 740's...

[Tictakman]

could i do a cobra maf, 740cc injectors, and e manage?

[C-Kwik]

You could, but you'ld be better off with a Z32 MAF. The Cobra MAF is limited to some 350 HP, unless you use a reducer circuit. And the Cobra MAF would have to be tuned completely manually. The Z32 MAF is a supported MAF so the E-Manage can automatically remap any tuning you have done to compensate for it.

[huguetpj]

The Cobra MAF is limited to some 350 HP, unless you use a reducer circuit.

What do you mean by a reducer circuit?

[andrave]

well, first off the cobra maf requires additionally stuff to install, JWT has more details on that. The Z32 mafs is a "supported" mafs so it won't require anything additional. Second, the Z32 mafs is good for at least 550 hp. I've seen some guys push them past that.The cobra mafs is good up to 350-400 hp but if you want more you have to use a reducer circuit, which reduces the voltage it puts out (or something) to extend its usefullness.I think that using a JWT ecu and an emanage is overkill, for the money you might as well get a standalone!

[huguetpj]

The cobra mafs is good up to 350-400 hp but if you want more you have to use a reducer circuit, which reduces the voltage it puts out (or something) to extend its usefullness.

But, I suppose, the Cobra MAF also outputs up to 5V, so reducing the voltage output won't make it read past that. Unless you mess around with the sensor itself, hmmm maybe changing the R values of the R bridge.... but this could be used on the KA MAF also... hmmm need to look into this. :thinker

[Tictakman]

so from what ive been reading ill be going with the z32 maf. since id be using that then i could go with the safcII correct? or should i go with the emanage with more tuneability?

Zak