Vortech fmu with calibration disks and boost bleeder
Vortech super fmu
Cartech fmu
Apexi S-AFC
?

From what I have gathered, the S-AFC is the most sophisticated, right?

 

The S-afc isn't really the most sophisticated.. It just requires dyno tuning to get the full potential out of it. So you can tune the afc to your chart and make a flatter line... Installation is easy.

 

Any one of the FPRs you listed will still require a S-AFC to really fine tune it.

People are recently leaning towards the Cartech FMU cause it has a screw that you can turn to adjust the Fuel Pressure. This is better than removing the disc on the Vortech FMU. The Super FMU by Vortech is similar to the Cartech except a bit more $$$

Dixit

 

FWIW

Super FMU has a base fuel presure adjustment, so you dont need the OEM FPR or an adjustable FPR to lower the base FP with a walbro fuel pump. It also has an adjustment for max fuel pressure no matter what the boost presure. The car tech has neither of these.

 

Very nice. Maybe I should look into this for the install starting Saturday.

Dixit

 

Cartech has this feature.

 

Thats not what they told me on the phone.

 

Checked their webpage

http://www.cartech.net/fmu2020instruc.htm

 

Haltech E6K

 

My mistake... I just realized Matthel doesn't have a stock FPR so we were able to lower the pressure to 23 psi on the dyno.

How's the Vortech Super FMU able to lower the base FP with the stock regulator still inline?

 

Vortech website says you can use it as a standalone fpr in place of the stock fpr.

 

So that means you have to remove the stock FPR... just like the Cartech FMU.

http://www.vortechsuperchargers.com/tech/fmu_sfmu.html

 

Alright with all this confusion, which is better? I seem to like the cartech since you dont need discs to change the fuel pressure. The both vortech ones you still do.

Dixit

 

Nooooo, with the Cartech you need the stock FPR. With the Vortech SFMU you can go either way, to go with a lower pase fuel pressure than the OEM FPR will allow you need to remove it.

Dixit, I would go with the Cartech if you are planning on staying with the stock injectors. If you want to go past ~375whp you will need larger injectors so using the SFMU is a better deal because you can lower the base fuel pressure.

Also if you ever want to do wet nitrous, the Vortech SFMU is better. You can use the max fuel pressure setting so you get to 70psi by 3500rpms and it stays their through 6500rpms, stable fuel pressure is a requirement for properly tuned wet nitrous. You will need an AFC to lean it out and tune the injectors/AFR for boost only. Its a wierd set up that hit me the other night, I think it will work well. Once my motor project is finished I will go that route. 100hp wet + 15psi should break the tranny very easily!

 

Gotcha.

 

Here's a fitting we may be able to use to replace the stock FPR and have the line go straight to the adj fmu.

http://www.junauto.co.jp/products/en.../index.html?en