What are the options for fine tuning the AFR?
02-13-2003, 12:13 PM
#1
What are the options for fine tuning the AFR?
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?
Vortech super fmu
Cartech fmu
Apexi S-AFC
?
From what I have gathered, the S-AFC is the most sophisticated, right?
02-13-2003, 02:20 PM
#2
Re: What are the options for fine tuning the AFR?
Originally posted by Stephen Max
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?
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?
02-13-2003, 06:04 PM
#3
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 $$$
Dixit
People are recently leaning towards the Cartech FMU cause it has a screw that you can turn to adjust the Fuel Pressure. This is better than removing the disc on the Vortech FMU. The Super FMU by Vortech is similar to the Cartech except a bit more $$$
Dixit
02-13-2003, 06:08 PM
#4
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.
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.
02-13-2003, 06:11 PM
#5
Originally posted by MardiGrasMax
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.
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.
Dixit
02-14-2003, 11:41 AM
#8
Checked their webpage
http://www.cartech.net/fmu2020instruc.htm
Installation
The rising rate regulators fit into the fuel system after the stock regulator, and in series with it. They become the last item before the fuel returns to the tank. Do not remove the stock regulator, as it still controls the fuel flow under most manifold vacuum conditions.
The rising rate regulators fit into the fuel system after the stock regulator, and in series with it. They become the last item before the fuel returns to the tank. Do not remove the stock regulator, as it still controls the fuel flow under most manifold vacuum conditions.
02-14-2003, 12:14 PM
#10
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?
02-14-2003, 12:25 PM
#11
Originally posted by Y2KevSE
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?
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?
02-14-2003, 12:52 PM
#12
Originally posted by Stephen Max
Vortech website says you can use it as a standalone fpr in place of the stock fpr.
Vortech website says you can use it as a standalone fpr in place of the stock fpr.
http://www.vortechsuperchargers.com/tech/fmu_sfmu.html
Is it necessary to use a stock or another regulator with the SFMU?
For almost all applications only the SFMU would be used. Using the restrictive stock regulator with the SFMU with a high flow rate pump would cause the rail pressure at idle to be too high and cause a rich condition. Because the SFMU has so many adjustment features most requirements can be met with it alone.
For almost all applications only the SFMU would be used. Using the restrictive stock regulator with the SFMU with a high flow rate pump would cause the rail pressure at idle to be too high and cause a rich condition. Because the SFMU has so many adjustment features most requirements can be met with it alone.
02-14-2003, 05:11 PM
#14
Originally posted by Y2KevSE
So that means you have to remove the stock FPR... just like the Cartech FMU.
http://www.vortechsuperchargers.com/tech/fmu_sfmu.html
So that means you have to remove the stock FPR... just like the Cartech FMU.
http://www.vortechsuperchargers.com/tech/fmu_sfmu.html
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!
02-14-2003, 11:55 PM
#15
Originally posted by MardiGrasMax
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.
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.
Originally posted by MardiGrasMax
Once my motor project is finished I will go that route. 100hp wet + 15psi should break the tranny very easily!
Once my motor project is finished I will go that route. 100hp wet + 15psi should break the tranny very easily!
09-21-2003, 09:14 PM
#16
Senior Member
Join Date: Sep 2000
Posts: 775
Originally Posted by Y2KevSE
Gotcha.
http://www.junauto.co.jp/products/en.../index.html?en
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