Hi,

I'm after a MegaSquirt 2 V3 Map for either a TBI or TPI 305 or even 350 running the standard ignition system (HEI, with 8/7 Pin module).

Reason for this is because Ive recently converted my Camaro to Propane only (uk its half the price of petrol) and it runs a MS2 V3. Had the car idling and running but proved difficult to map. We found this to be due to a weak signal from the HEI module.

Done the modifications to the ECU for HEI and signal is a lot better. But it wont start now and nothing we do seems to alter it. Going to re flash the software but would like a running map from a Camaro to upload to it straight away just so we know the ECU setting are correct and we haven't clicked some setting on/off with out realizing.

So if anyone would be able to email me a map from a running Camaro, either TPI or TBI with HEI ignition system would be greatly appreciated!

 

I have MS 3 extra so my maps won't just plug it for you. I would say just grab any spark table you see for a small block chevy. Heck, even for a ford would work. I would be concerned about the spark for propane as I know nothing about using propane as a fuel and how much spark it could take.

 

just so u know when u first flash the ms firmware the tune that is loaded into the ecm is for a stock 350 tpi

 

So when I re-flash it I should have a standard tune for my car anyway??

Propane spark needs a more advanced ignition as its a slower burning fuel, but it will run on a petrol map, just not efficiently.

I would like a map for something running the same ignition system? I assume fords are a little different when coming to settings? Could you send me your ms3 map, I could at least open it up and just copy the settings over to a new map for my ms2?

 

unless they have changed it in some of the latest code releases , ms1 and ms2 extra code always came loaded with a 350 tpi tune in it

so yes reflashing the firmware to the ecm should give u a stock tpi tune

im actually going to be reflashing mine tonight so i can verify for ya

 

Thank you project 89, going to re-flash mine today, but confirmation will still be helpful. Cheers for your help so far guys.

 

im running an older ms1 extra code but the tune was infact for a tpi engine when i reflashed my ecm

so just double check after u reflash it it will be pretty obvious if its not a v8 tune just look under the engine constants page

 

Sorry for long awaited post... Turns out the map isnt for a 350TPI anymore, but more for a 2l car.

Got it running with a re-flash though! so all is good. Only problem i have now is when i hook up all the timing wires (5vREF, ECU Control wire) it just kills the car! thinking theirs a setting i need to click on the ECU, as i assume the 5vREF is working, but something causing the ecu to either not work, or time wrong.

Cheers for your help guys!

 

Which spark output are you using?

This has hung up more people than I can count. You did the stupid HEI mod to the 3.57 board ?

The MS3 is a lot nicer, same with the Module (MS-PNP, etc). The MS2 v3 stuff is still a little too 'diy'. Plus the MS2 v3 has lower noise tolerance than the newer stuff.

-- Joe

 

I was looking at the MS3, but with me only using LPG injectors i needed drivers that can work with Low impedance injectors.

Screen shot of the map - HEI Mod has been done as well.

 

i dont have time to show u the proper settings as im leaving for the farm , but the settins u have are wrong for gm hei , ill post up a screen shot when i get home

 

Had a feeling they might be, there's a few different setting for this type of set up according to the wonderful world of the Internet lol.

Greatly appreciated with the help and look forward to the screen shot!

 

dammit i forgot all about this , ill get ya the info when i get home from work today

 

Thank you!

 

switch ignition capture to rising edge
set the sparkmode to gm hei
cam input should be off
dwell should be around 2.1-2.4

 

Hi, unfortunately half the setting you have mentioned I can't do

I've alter dwell and ignition capture.

Don't have GM HEI, but I do have the option to select it as a separate option to 'GM bypass on D16', which I've done.

Spark A output to JS10 instead of D14

Cam input can only be changed to inverted?

With the above settings and setting "spark mode" to 'basic trigger' it now runs connected up and altering timing seems to alter the engine. Although laptop is now charging so not had much of a play with it.

Thanks, Carl

 

they really screwed up the manual , depends on which page u look at and the info is different , glad u were able to get it running

not sure why u cant disable cam input , must be something in the new code , last time u used ms2 code was about 2 or 3 years ago , and i wanna say it was ms2 v 2.11 or something

 

Are you using what you believe to be a stock table? Running an engine on LPG requires more advance typically from what I remember of it. When I worked at a propane plant the trucks that ran on it had a box that would advance the timing. I may be able to find out how much over gasoline in my Impco book if I can find it.

 

That makes sense. I converted my bobcat to propane a number of years ago and the thing I noticed most was it was a little down on power. Perhaps I should have added more advance.

The only thing about propane is you lose the cooling affect of fuel. When gas hits the valves, it absorbs a lot of the heat. With propane you always have a hot combustion chamber. But it runs clean, smells cool, and you can run it in a barn for hours without passing out. I've since switched to a diesel machine, and even working outside after a couple hours I feel a little sick from secondary exposure to fumes.

-- Joe

 

Also running LPG you probably can turn off the Acceleration Enrichment.

 

I'm trying to wrap my head around this.

When I did my LPG conversion I took a carb apart, cross drilled it and installed a big jet, which I then connected to a beam type propane regulator. (with primer button for cold start).

This was vac draw, so it pulled what it needed.

Now on an EFI application, you are using LPG injectors yes, so would't you still want a 'pump shot' on large throttle transitions?

-- Joe

 

The LPG system uses a vapouriser/regulator which converts the liquid from the tank to gas, this is regulated through a diaphragm which is controlled off the manifold pressure to keep it at the right pressure.

That then goes to the injectors which kinda work the same as petrol ones. So you just tune them to open for a certain amount of time at a certain rev range.


No the table is being modified and tuned to be more LPG friendly, as in a load more advance ignition lol. Going to be connection a EGT sensor into it too so I can get everything perfect.

Thank you for the offer.

The good thing about LPG is the high octane = high compression= more efficiency and power lol