MegaSquirt PNP for Miatas

[FoundSoul]

I may be able to shed some light there... I actually tuned the base map for the 1.6 cars on Scott Siegel's SM car here locally, on what has since become my dyno but this was back a year and a half ago when it was at the local Subaru dealership Scott used to tune at, I later bought the dyno from them when Scott left. Long story there .

We tested his car on his stock ECU as he had been running it in SM with a fairly standard SM setup. He was running the standard issue Racing Beat intake, with the AFM, and had his timing advanced to 14* base on the stock ECU. Here are the results of the stock ECU versus the MSPNP MM9093 dialed in with the AFM still in place:


That's about 9 ft/lbs down low, and still 5.5 ft/lbs up top and 6.6whp up top, with gains across the board.

Then even though it wouldn't be legal to completely remove the AFM in SM or IT I don't believe, we tested it anyways and saw further gains:


We didn't spend alot of time on the tune when we removed the AFM so I believe we could have further improved things, gotten rid of that one dip and possibly brought out the top end a bit more, but there you have it, gains pretty much across the board.


Larger images here if you'd like:

http://megasquirtpnp.com/images/mm90...withoutafm.gif

http://megasquirtpnp.com/images/mm90...withoutafm.gif

[IPRESS]

I am going to try to get to Jerry's next month and get the "supa fly tune". We should have some info to post. on the 1.8 MSPNP, in ITA trim. I may see if we can do some tuning without the AFM too (which would work with NASA).

[tnord]

Jerry -

If I'm trying to research and learn how the software works on the 96-97 PNP unit on the msefi.com website, what should i be looking for?

is the MS-I or MS-II processor used? it seems like from the product description on your site that it's the MS-I, but from msefi.com it looks as though only the MS-II has ignition timing capabilities which certainly your product has.

is the version of Megatune i should be researching the MS1-Extra-Hi-Res HR10e?

i don't see any installation articles for the PNP on your site, is that because you truely do just plug the existing wiring harness from the OEM ECU into the MS?

[Marcus Miller]

Jerry -

If I'm trying to research and learn how the software works on the 96-97 PNP unit on the msefi.com website, what should i be looking for?

is the MS-I or MS-II processor used? it seems like from the product description on your site that it's the MS-I, but from msefi.com it looks as though only the MS-II has ignition timing capabilities which certainly your product has.

is the version of Megatune i should be researching the MS1-Extra-Hi-Res HR10e?

i don't see any installation articles for the PNP on your site, is that because you truely do just plug the existing wiring harness from the OEM ECU into the MS?

Speaking for the 90-93 unit, yes all you do is plug in the stock wiring harness and the vaccum line to the maf.

Would be interested to know more about your other questions though Travis.

Marcus

[Monkeywrench]

Can anyone comment on the rate of fuel burned with a PNP or other ECU set-ups? I would imagine it has a lower bsfc rating. Might make for a better enduro set-up.

[FoundSoul]

Can anyone comment on the rate of fuel burned with a PNP or other ECU set-ups? I would imagine it has a lower bsfc rating. Might make for a better enduro set-up.

With a standalone such as the MSPNP you have the capability to adjust your ignition timing and AFR at different load/rpm cells allowing fuel consumption to be fined tuned for sure. In any situation you can only go so lean to accomplish better fuel mileage, and in a race situation it's often even more important to err to the side of caution here for reliability's sake on a engine you're running harder than normal. But the fact remains with complete control of your ignition and fuel tables you have complete control. Is there a significant portion of the course where you're at 40% load(*) and 6000rpm? Don't see any reason why you can't lean it out there to get better mileage? You've got the power. And better yet, doing so won't effect the WOT areas of the tables at all. You don't have to compromise economy and power, generally these are sought in different load ranges, hence you can accomplish both.


(*) Load isn't really measured in percentages but in kPa, but it's easier to express this way here...

[wepsbee]

I have a 95 Ford Escort GT with a 91 engine. This is a Mazada BP 1.8 engine which was also in the Miata's. I am having trouble locating a stand alone ECU for this car. Does the Miata MS ECU also work for my car?

[FoundSoul]

Sorry I missed your post from earlier this month Travis. I'll have to check my account here and see if it's setup for email notifications... but to answer your questions:

All three of the current MSPNP models for Miatas (90-93, 94-95, and 96-97) are running the MS-1 processor. The MM9093 and MM9495 models run the standard MS1 Extra firmware, and the MM9697 runs the HiRes MS1 Extra firmware. For those familiar with MegaSquirt these details are of course available. For those that just want it to work though, when you install the MegaSquirtPNP software package from the included CD-ROM or from the download link here (http://www.megasquirtpnp.com/mspnp_downloads.htm) the software is properly setup for your specific MSPNP model and you don't have to worry about what firmware version you are running unless you just want to know, or go out on your own and update it. (for example some of the MM9093 and MM9495 guys have ventured out and installed the HiRes firmware on these models, works fine of course)

The install is incredibly simple. Maybe an hour if you goof around. Check out the 'Quick Start Guides' for the install process in a nutshell on this page: http://www.megasquirtpnp.com/mspnp_installation.htm

That also has the full manuals linked ^^


Joe Tenney (ITA Miata #16) came by the shop today actually. We installed a unit in his car and I tuned it out for him. I pulled 3 comparo graphs before we did anything with his stock ECU in place with tweaked AFM, and have before and after comparison charts. I think Joe's pretty pleased. I'll post charts soon but figured I'd give him a chance to share if he wanted to.

[JIgou]

I am going to try to get to Jerry's next month and get the "supa fly tune". We should have some info to post. on the 1.8 MSPNP, in ITA trim. I may see if we can do some tuning without the AFM too (which would work with NASA).

A not-so-little birdie mentioned to me that "mission accomplished" might be appropriate?