GT-40 Performance Upgrades Help

Hey Thomas, I've been reading on the other site as well, very interesting discussion even if a bit over my head. As a GT-40 owner I appreciate all the work to find solutions to the ECM support issue.

Yes, we get a bit off track at times here, but it generally is something useful like an electric connector discussion, I've learned a ton on this site. I've been looking more and posting on the other site lately, enjoy it and it's a different group and different discussion so interesting to spend time on both.

Tom I used this kit but it previously came with a new ford connector.
https://www.diyautotune.com/product/diypnp-ford-60-pin-eec-iv-unassembled-kit-no-connector/
I have since moved the ECM up under the driver side dash panel. With an extension cable I manufactured. I think one of the reasons the original PCM GT40 ECM's are starting to fail on these engines besides age is the amount of heat cycles they have endured under the engine cover.
I verified the logged ignition table at a few points with a timing light and then transferred those values straight into the Megasquirt ECM. The fuel table required quite a bit of trial and error. In fact I am still adjusting it, that is part of the fun. When Adam and Tim visited last year there was quite a few back to back barefoot runs that showed I was a bit too fat on the top end of my table. Previously I had hardly ever used that section of the fuel table. Being able to log and then re tune makes this a fun project that just keeps giving. Hey I may even add that stroker kit so i can start all over again.

If you decide to go with the Megasquirt I can supply you with my tables. The block for the O2 sensor was the one Alan had made for his 81 when doing engine upgrades but never used. He kindly sent it all the way to Oz. I made up a elbow to get it further away from the wet exhaust if the O2 sensor failed but it has not been required yet.

   

Gary S wrote: I don't want to talk for Jbear but we must have used a million of them,they work in the proper use and sure beat the alternative. In Marks defense the picture of them above is not the megasquirt kit. In the telephone industry,before scotchloc's they would strip about 1" of insulation off a wire twist them together then slide a closed ended tube filled with some sort of grease over it. It relied on the grease to keep them on. Then they went to a connector called a " pumpkin seed" you'd do the same but they would crimp on,they were better because they didn't fall off as easy.

yup...scotchlocs were the boss Gary....but they sure helped to cut down on our overtime! Had to laugh remembering the twist and the little cloth tube. Was cleaning out the attic getting ready to move and found a box of 1000 'beanies' or in your lingo...'pumpkin seeds.

sorry Tom to be boring you........



john

Lewy2001, sent you a pm... any info you have on your megasquirt setup would be appreciated. I'm considering the same conversation and maybe setting up closed loop scheme. rbarras@gmail.com

I helped Thomas awhile back with testing the GT40 replacement computer options. I will be doing power adders at some point on my boat. I have done the research on the MEgaSquirt, but I'm also exchanging emails and working with the guys that support Ford EEC-IV Binary Editor and TunerPRO to get a definition file made to tune the factory PCM GT40 computer. I'll post any info I receive.

Are all GT40 heads the same?
Can I use a Mustang/explorer set on my 86 Martinique?

gun-driver wrote: If you can break the code and come up with a not super expensive way to add power to the GT-40 you will be a hero to a lot of people on here. I’ll be watching this one

It is done!!! Core Tuning compiled a definition file for the 300m marine gt-40 using their Binary Editor Software. I was emailing Clint and Ben for months to get it ready. This can also be used on earlier e290 ecus. I just got it loaded. Going to do some test using the QuarterHorse Chip in the coming weeks. The definition is MCSR1. There are way more parameters defined than what i expected. see screen shot. It is supposed to be able to datalog too.

Any updates to the GT40 Performance Upgrade?

Rusty

Using that MCSR1 strategy you can view BOTH the 300M and E290 tune? Or is this MCSR1 just for the 300M? Out of curiosity I’d sure like to compare and contrast the two tunes and see what changes PCM made.

yes.. the MCSR1 strategy will open both calibrations, but i wouldnt use e290 at all. the 300m seems to be a more mature calibration.

Biggest thing to notice it that they drop some spark and richen up the upper rpm range. they made some adjustments to lower/smooth idle too.

gun-driver wrote: Did this upgrade just allow you to get a dead ECU running or are you putting more ponies to the water with the tune?

both! sort of. the dead ecu replacement with the chips that places are selling are taking this same family of hardware and loading a stock tune/calibration on it to get up and running.

this software addition will let you manipulate/tune that stock calibration file for any performance upgrades you do. it also does datalogging. personally i plan to put a stroker rotating assembly in mine and i'll need to tune for it.

Rlbarrasjr wrote: gun-driver wrote: Did this upgrade just allow you to get a dead ECU running or are you putting more ponies to the water with the tune? personally i plan to put a stroker rotating assembly in mine and i'll need to tune for it.

Personally I would go roller cam, roller rockers and a nice set of AFR heads then see how it tunes, that combo should put you close to the 400 ponies mark.

I have a engine with 1998 date codes on some components - it has the 300 tune.

DHMcFadin wrote: Does any know what years pcm used the e290 and 300m calibrations? I have a 99 GT40 with the original ECM.

If you read the sticker on your ECM you'll know what you have for sure

Here's a picture of a sticker

Thank you! I appreciate the picture!

KENO wrote: DHMcFadin wrote: Does any know what years pcm used the e290 and 300m calibrations? I have a 99 GT40 with the original ECM. If you read the sticker on your ECM you'll know what you have for sure Here's a picture of a sticker