No More Voltage Clamps!

[FormerDatsun510Man]

Major update. We have now tested on a '96, my '00, '01 and '02 models and have found that we no longer need TPS nor O2 voltage clamps! No more mucking with the ECU! The key is adding just the right amount of fuel at low to mid rpm so that the ECU stays happy. As a result, I have done some pretty major changes with the programming for the Main Card. The fuel trims have been removed as they are redundant when the fuel curve is properly set in the first place. Additionally, I have found that some tuners used the fuel trims incorrectly which would make the engine run ok in one case (i.e. WOT) but not correctly in the transitions. In a nutshell, I think we had too many variables in the past versions of the card. Also, the Accelerator Pump is no longer an adjustable parameter. It still works, it is just that I have found there is no need for adjustment. The default setting has worked on every Miata I have tested to date. Thus, I have used the Green-Blue as a third parameter in adjusting the fuel curve optimally, which I think is much more useful. The instructions are attached.

The new PC Pro files are also attached. I now have a standardized way of naming the files so that I think it will be much easier for everyone to stay on top of what version file they are running. For all of you with programmers, I recommend giving these files a try. Like the instructions state, you don't have to remove the wires from outputs "A" or "B" on the card... the reprogramming takes care of disabling the O2 and TPS clamps and allowing the signal from the sensor to simply pass through the PC Pro as if it weren't there.

Anyway, I cross posted here because I would like to have this thread open to discussion, but I want the original location where I have a centralized spot for all PC Pro programming udpates, well... updated :biggrin:.

I'm curious what sort of settings you guys end up with and how good your fuel curves get.

The original spot for all PC Pro Programming Updates is here:

http://www.fastforwardsuperchargers.com/forum/showthread.php?t=1733

[Gman7007]

Bill,

Does this effect hotsiders? I had my card reflashed Aug 2009 and she runs great.

Jose

[FormerDatsun510Man]

It has only been tested on Coldsides so far, but I expect it will work equally well on Hotsides.s

[tann3r]

I'll definately have to give this new update a shot.

If anyone in the Houston, TX or surrounding areas is interested, shoop me a PM. Maybe we can get a group together next weekend and meetup, compare notes, and install this update. Yall bring the cars, I'll bring the programmer.

[Godless Commie]

Bill, how would I go about this update?

Should I send my cards to you, or just buy a programmer?

[beatle]

How does this affect drivability? I always had that tiny hesitation before the ECU went open loop and started delivering proper fuel. My car is currently down for a clutch, and this may be a good time to ship you my cards.

[FormerDatsun510Man]

The reason I made this update was to improve driveability and I feel it is working well on the two '96s, my '00 and the '01 that have had the updates done. I've learned now that the clamps aren't needed and the car will drive smoother when the correct fuel curve is used.

Just did a '96 here on Saturday and it drove without any hesitation from what I could see. I hear the owner is very happy with it.

Please note that I have another update I put in the usual "PC Pro Programming Updates" thread. This is the update I did to the two '96s and my '00.

[lowboy72]

I have put over 1000 miles on my 2002 with the clamp removed. The trims are good and I have had no transition issues.

[Godless Commie]

Great.. I updated the cards, which makes me realize I need new rear tires.

[FormerDatsun510Man]

I thought I would post on update on this. Now that I have spent some time on the east coast and have my third engine in the car for the last few months, I have had a bit of time to do more experimentation with the PC Pros. Verdict? I am now certain that the latest version that I posted here (version 003) is the best. This has no voltage clamps at all. Additionally, I found there is a driveability improvement in putting the wires for the TPS and/or O2 voltage clamps (if your cards were wired this way) back to stock. That is, bypass the PC Pro with the TPS and O2 wires and have them going straight to the stock ECU. Specifically, the only wires that should be connected to the PC Pro Main Card are the Power, Ground, and 4 injector wires.

Finally, if you have the big TB and the standard to high boost (105mm through 115mm crank pulley and 65mm sc nose pulley), then the default settings are great. However, I have found with the stock TB and lower boost settings (less then the 105mm pulley) the Main card settings need to be increased from 6 to 7 lights on the Y-B. Also on the E-Cool card setting needs to move up from 3.5 to 4 lights. On the LowCost kits I would suggest 7 lights on the Y-B on the Main Card. Basically you want whatever you need to ensure 11-12:1 AF ratio from 3500-7000rpm.

Just to clarify, the latest PC Pro files are always here:

http://www.fastforwardsuperchargers.com/forum/showthread.php?t=1733&page=2

Basically, all I am saying in this post is a reconfirmation that the PC Pro files in the above link are the ones that yield the best results. The only additionally comment is that on lowboost kits the fuel settings may need to be increased to arrive at the same 11-12:1 AF ratio.

[Byrdmen]

Bill,

I had my cards reflashed by Tom a month or two ago to the latest firmware. Since my harness was built just under two years ago, do I still need to reroute the wires to the TPS and O2 back to stock?

Thanks.

[FormerDatsun510Man]

When the harness was built, I'm pretty certain it would have had the TPS clamp wired in. Thus you should check your harness and see if it is still wired that way. To clarify, make sure the only wires attached to your Main Card are the Power, Ground and the Four Injector Wires (both "in" and "out" wires so that is a total of 8 wires). The solid purple and purple with the yellow stripe were the ones used with the TPS clamp. If those are still wired to the Main Card, cut them and wire them together on the ECU side. Or you could remove the harness from the car and simply cut those wires completely back to the harness and reconnect the solid white wire for the TPS pin.

[Byrdmen]

Pin 3E is the ECU to TPS. Formerly passes from the bypass harness to the PC cards and back to the ECU.

Now, on the harness, Pin 3E, Purple to Purple/yellow, soldered and heat shrunk. Both bare ends of the Purple and Purple/yellow to the PC cards heat shrunk just in case. No CELs.

Thanks for the heads up Bill.

[KiwiFFSFan]

I thought I would post on update on this. Now that I have spent some time on the east coast and have my third engine in the car for the last few months, I have had a bit of time to do more experimentation with the PC Pros. Verdict? I am now certain that the latest version that I posted here (version 003) is the best. This has no voltage clamps at all. Additionally, I found there is a driveability improvement in putting the wires for the TPS and/or O2 voltage clamps (if your cards were wired this way) back to stock. That is, bypass the PC Pro with the TPS and O2 wires and have them going straight to the stock ECU. Specifically, the only wires that should be connected to the PC Pro Main Card are the Power, Ground, and 4 injector wires.

Finally, if you have the big TB and the standard to high boost (105mm through 115mm crank pulley and 65mm sc nose pulley), then the default settings are great. However, I have found with the stock TB and lower boost settings (less then the 105mm pulley) the Main card settings need to be increased from 6 to 7 lights on the Y-B. Also on the E-Cool card setting needs to move up from 3.5 to 4 lights. On the LowCost kits I would suggest 7 lights on the Y-B on the Main Card. Basically you want whatever you need to ensure 11-12:1 AF ratio from 3500-7000rpm.

Just to clarify, the latest PC Pro files are always here:

http://www.fastforwardsuperchargers.com/forum/showthread.php?t=1733&page=2

Basically, all I am saying in this post is a reconfirmation that the PC Pro files in the above link are the ones that yield the best results. The only additionally comment is that on lowboost kits the fuel settings may need to be increased to arrive at the same 11-12:1 AF ratio.

Bill,

i received my kit only a few weeks ago in new zealand..... what versions of the software would be loaded on the pcpro cards
and would the wiring of the tps /02 be back at stock or not?

Also as i am really new to all this ,.... i press the mode button on the cards and it cycles between the colours .... but when i get to a coloour like red/blue... how to i then get in to see how many lights are programmed up for that parameter???

[socal pat]

at that point press the + or - and you will see the lights go up or down. You'll get the hang of it pretty quickly.

[KiwiFFSFan]

thanks.... you are right i got the hang of it... wanted to be comfortable changing it before i hit the dyno next week!