Fuel Managment question!

[hondaaccordlx]

gotta 91 crx w/ jdm b16.  i am putting eagle rods and JE pistons. for internals. and prolly upgrade the valve train(not cams)   i am going to use a t3 turbo and keep the boost down on it, like 5-8 psi.   But my question is. what kinda Fuel managment should i use. the vortech FMU or should i use the hondata?  There are no dyno shops even close around me or a hondata dealership. what should i do?

Thankx

[silverkorn]

where are you located, there are people that know hondata fairly well that can usually be found that can help with tuning.

personally i would go with hondata, it comes to you get what you pay for. but then again for the little amount of boost your going to be doing a Vortech FMU might do the job but its not a 100%. i would say if you have the money and want something that will last get the hondata, but if your trying to cut some corners here and there the FMU might be the way to go

[drastik]

go to homemadeturbo.com and look into uberdata (hondata equivalent) or the afc hack (if you don't mind running 10 psi).

[silverkorn]

you get what you pay for

[drastik]

....... unless you do it yourelf

[cottagecreep]

go to homemadeturbo.com and look into uberdata (hondata equivalent) or the afc hack (if you don't mind running 10 psi).

using the afc hack does not cut it. You need to address your timing as well. AFC hack also does not mean you have to run 10psi. You can run anything up to 10psi (actually just a bit under 10) on a stock map sensor using a vafc/safc.

[drastik]

the afc hack requires 450cc injectors, and unless you want too much fuel, you should be at at least 9psi. (i'm pretty sure anyway )

[cottagecreep]

The afc does not require 450cc injectors. It will control any injector which you can install on your vehicle.

What an afc does for turbo cars, is allow them to control the amount of fuel getting into the combustion chamber. Therefore controlling the air/fuel flow. When you install 1st gen dsm 450cc injectors (for arguments sake), of course they will be pumping way too much fuel when compared to your stock 230cc(I think thats stock) injectors.

So, with your handy afc, you cut back the amount of fuel delivered by a self determined percentage, across incriments in the rpm band. So, the incriments vary from device to device, some are 1k rpm incriments others are 500k incriments.  

Lets give an example (do not follow this for a setup), 450cc injectors pump x amount of fuel, and you need y amount of fuel. So you mathmatically decide that for your setup, your injectors need to pump out 34% less fuel than they do at their normal duty cycle. So, you start with that, maybe leave it a little richer up top. So on and so on. Allowing you to run any psi you want, because you can control your injectors by up to 50% (if I remember correctly on my safc).


Thats a very early morning basic overview.

[Goldfingiz]

Stay away from the FMU. If you go with Hondata, you'll have to convert to OBD1 unless you go with the older Hondata system. You may want to check out www.zdyne.com A little more expensive than Hondata, but it looks great. Mine should be here this week. If you're interested in it, I'll let you know how it is.

[hondaaccordlx]

I d'nt wanna run a hondata. or something just like it. because there is no place around here that is a dealer for them.  I just wanna run something that i can install, dyno it. and be good. Run 10 psi and not have to worry about my engine blown up..

Thankx for the replys ....

 more suggestions are welcomed

[Honda4ever]

Have any of you guys done any type of turbo work? :crazy:  With the 8lbs that you plan on running a FMU with a VAFC is the best option seeing you have no dyno or Hondata tuners. :drivingskid:  Once you are not planing to go over 10lbs, you can stay on stock timing, but try using a colder spark plug...preferably NGK #7. :headbang:

Oh, try getting wiseco piston. They are really good for the price $409.00 compared to the JE/SRP, and I built many turbo and N/A engine with wiseco. :werd:

[cottagecreep]

Have any of you guys done any type of turbo work? :crazy:  With the 8lbs that you plan on running a FMU with a VAFC is the best option seeing you have no dyno or Hondata tuners. :drivingskid:  Once you are not planing to go over 10lbs, you can stay on stock timing, but try using a colder spark plug...preferably NGK #7. :headbang:

Oh, try getting wiseco piston. They are really good for the price $409.00 compared to the JE/SRP, and I built many turbo and N/A engine with wiseco. :werd:

Ok, first of all. You need to adress your timing no matter what, weather it be with an msd btm, or tuning your stock computer, it is a must. Engine managment is the key to your engines life. If you do not adress your timing (ESPECIALLY AT 10PSI) than you will be pinging from here to piston melt down.

Also, using an FMU and a VAFC/SAFC is trying to complete the same task. That is not accurate at all and is very poor advice. Basically, a FMU tries to use a higher fuel pressure to deliver more fuel into the cylinders (not really reccomended, but works) a VAFC/SAFC works as I mentioned above.

The only piece of advice that our buddy Honda4ever made that even made sence  :crazy:  was use one step colder plug.

Here is a good link to confirm what I just told you is true and accurate.

http://www.homemadeturbo.com/faq/index.html

[Goldfingiz]

Have any of you guys done any type of turbo work? :crazy:  With the 8lbs that you plan on running a FMU with a VAFC is the best option seeing you have no dyno or Hondata tuners. :drivingskid:  Once you are not planing to go over 10lbs, you can stay on stock timing, but try using a colder spark plug...preferably NGK #7. :headbang:

Oh, try getting wiseco piston. They are really good for the price $409.00 compared to the JE/SRP, and I built many turbo and N/A engine with wiseco. :werd:

I've been dealing with turbo Hondas for about two years, and I'd never run over 6psi without a legitimate EMS. Even at 6psi I'd at least get my ECU chipped to retard timing 1 deg/psi and add a nice fuel map, THEN do minor adjustments with a VAFC.

[r7]

yeah, i've had my car turbo'd for a while too .... anyhow


6psi on forged pistons and rods?  bah, go with hondata or aem, and run 10psi @ least..

running 7 psi on stock internals here... motor holds fine


and where are you located?  tuning yourself isn't that hard, on the street.

[crx91]

ask around.  I would go with the hondata