GT-40 Performance Upgrades Help

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

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.

   

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.

That's because on this site as opposed to the other site you frequent have actually met and hang out together. Why not PM Mark and ask him your questions? He only lives on the other side of the world and does not keep the same hours as we do.

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.

uk1979 wrote: Guys the Scotchlock jell filled 314's and alike have worked well for me

They absolutely work, it's just that when you think about what they are doing, it's an unnatural act. Chopping part of your wire away to make a connection is about the 10th best way to do it. I would never use one in a boat application, I will admit I've snapped a few on trailer wiring just because I was in a hurry.

Once you had mapped out the stock PCM fuel and timing tables how was it programming the megasquirt to replicate those tables you had logged?

Which model megasquirt are you running and are you utilizing the stock engine harness? I see megasquirt make a plug n play EEC that has the Ford 60 pin connector so you could perhaps use the stock PCM engine harness with it.

Any pics of the setup?

I ran the engine with the standard PCM ECU while using the Megasquirt logging feature with a wideband O2 sensor. I also logged the timing while running the standard PCM ECU.

The wideband O2 sensor is stilling surviving in the wet exhaust environment after two seasons of use. I do not use the O2 sensor in closed loop mode it is just there for manual tuning purposes. The Megasquirt ECM is run just like the original PCM ECM in open loop mode.

Gary S wrote: I question any company who would use scotch loc's in a marine environment .........

WOW!! There's no question in my mind. This puts them at the very bottom of my list!

Picture is from "marine performance chip"


I wonder if they would guarantee the Scotch Lock's for 10 years?

Where someone found a chil for it

CI Restorations wrote: http://www.magnumtuning.com/en/detail/smart-tune-x-boat-fuel-tuner-performance-module     Anyone???

Mike,
Here's a direct link to the Magnumtuning site. I haven't heard anything about them but maybe another member can comment.

What were you referring to below?

CI Restorations wrote: Any clue where?

Maybe you missed the question but I'm curious if this boat is yours or a customers?

Has anyone used or heard of Magnum smart tune boat performance module the "claim" 17% hp and tq increase????

Unfortunately there isn’t anything bolt on that is going to help you. PCM has gotten a fair amount of power out of that engine as is, and its not the same as the automotive in terms of it running open loop vs closed loop. None of the automotive chips would help you… and the marine gt40 market is not big enough that any aftermarket is going to support it from a computer side. If you want to scrap the fuel injection buy a carb and ignition system, then change the cam, intake, etc you can end up with more hp but it wont be easy or cheap. Sticking with the fuel injection requires a custom solution.

Any clue where you may have seen that

Mike,
Is this 99 sport your boat or a customers? How versed are you with the PCM's?