Shadow Dee

How can i tune make car to run rich and make my injectors run ar about 80% since it only show there running at 7% and for some reason my load vslue is always on WOT??? ANYONE

dubulup

not sure what's going on in here???

compuskills

He is talking about the Powertrain Management Computer. (piggyback)

dubulup

yes, I know that...he questions make no sense, and it sounds like his piggyback is broken.

compuskills

Oh sorry bout that and I hope its not broken as I think he just picked it up from another board member.

Shadow Dee

Everything runs okay, i already tuned all three modes i just dont know how to make my car rich, therefore thats my question, the only thing that is weird is that the load is always on WOT??? No idea y or how i can change that.

compuskills

Do you have or have you downloaded the manual?

Shadow Dee

It came with the manual, read it several times just incase I missed something and nothing about the rich/lean problem nor the WOT just tuning.

compuskills

Did you check for any error codes? I would think the WOT would be tps related.

dubulup

why do you want to "make your car run rich?"

if you tuned all three modes...you should have used a wide band oxygen sensor and tuned for the proper A:F ratio.

sereneseven

Umm how did you manage to tune it with out knowing how to make it rich or lean??

rajeevx7

iTrader: (11)

Add fuel through the commander key pad to make it rich.

Your always on WOT, so your TPS needs re-calibrating.

bajaman

You have 'FUEL' and 'TIMING' for three throttle openings, basically: Idle, Part Throttle, Wide Open Throttle. You select the mode, and make changes. For example typing in code '100' enters you into the 'Idle' menu. '200' takes you into the 'Part Throttle' menu, etc. Within the Part Throttle and WOT menus there are rpm ranges you can 'Add' or 'Subtract' fuel.
You do the same thing with timing.
Really...if you read the manual it is pretty step-by-step, and even has a tutorial.

Shadow Dee

Another PFS user gave me the 3 data sheets and i went off those settings and im still lean.

Shadow Dee

Umm..... well its never good to be lean so...... i should be running rich, im not saying i want to run extremely rich where ill be shooting out flames from my exhaust.....

maxcooper

First things first: BE VERY CAREFUL. You could easily break an apex seal in your engine, requiring a rebuild. Rebuilds start at $3K, probably average about $5K, and can be as much as $8K+. You really shouldn't be tuning without a wideband oxygen sensor, a lot of rotary FI tuning experience, or prefereably both.

The load value thing sounds like it might be a problem. You should fix that before boosting your car or attempting to tune it.

Under what conditions are you running lean (you could be lean under boost at 6000 RPM and lean at 4000 RPM, etc.)? How do you know that you are running lean? What evidence do you have?

-Max

Shadow Dee

Well my keypad says that im Lean and my fuel cycle is like at a 7% where as it should be around 80% and my 02 readings are very low as well.

sevensheaven

iTrader: (1)

The PFS indicator of lean is useless, it uses the stock O2 sensor. You need a wideband with data logging to determine a true across the spectrum AFR.

Terry7

rajeevx7

iTrader: (11)

So, are you saying that you are adding fuel, and your duty cycle is saying 7%?? If that is the case, one/both of your computers are screwy.

Shadow Dee

my o2 must be bad, i just got a wide band and as for the 7% cycle which has to be wrong, i will have to look into the connections or harnesses ect.

Thanks for the input evryone.

maxcooper

7% when? "80%" refers to a peak injector duty cycle, not a constant reading. Injector duty cycle will change dramatically (it MUST or your car would stall from massive flooding) as you change the load and RPMs.

Here's my web page to help "play with the numbers" for fuel system control parameters and PEAK power production:
http://maxcooper.com/rx7/how-to/fuel_system/calcs.html

Wade Lanham used to have a web site with a bunch of info about PFS PMC (aka EFI PMS) tuning. However, the link I have no longer works. Does anyone have a newer link to Wade's site?

-Max

rajeevx7

iTrader: (11)

Right, Max is correct. Your idle duty will be lower when idling, but it should still increase if you add fuel while parked.

Wade's site is down I wish I had printed it!

sevensheaven

iTrader: (1)

I saved all the written material by Wade on the his web site for a rainy day! If anyone knows him and can get his permission and or is willing to host it I would gladly offer it up. Pm me for a copy of what you need.

Terry7