27 replies to this topic

[mini.30]

Does anyone on here have MegaSquirt up and running on a 5 port??

I am looking into the possibility of adding it to a standard mpi, I have been on the Turbo Minis forum and found some information that seems to indicate that it is possible to use most of the standard mpi sensors etc.

Just wondering if anyone has it running and could give me a few pointers

Thanks
Mark

[Ethel]

I think it's been done by some of the Turbo-minis crew.

[jamie@thefatgarage]

Although sensors may be an issue (not tried it with standard sensors) the major issue with running megasquirt on a 5 port head is getting around the charge robbing due to shared inlet ports. There are ways to mitigate it with long inlets and lots of squirts per cylinder or a wet plenum setup. I don't think you would have any benefits over the standard setup which is designed to cope with the inlet ports configuration of the 5 port head unless you made modifications to inlet and positioning of the injectors etc.

I am in the process of building a turbo with 5 port head and MS, running a wet plenum and tuned lengths between to sets of injectors to get around the issue. Should be ready in the late spring. If it's successful I'll share the design.

[mini.30]

According to one of the guys on Turbo Minis it is possible with many of the current MPI sensors. The charge robbing is sorted out by 'siamese code'. I just needed it explaining in simpleton terms as the guys on Turbo Minis are very technical.

Never mind, i'll keep looking

Thanks
Mark

[jamie@thefatgarage]

This link explains it quite well. Different ECU but same theory.

http://www.emeraldm3...ts_Aseries.html

You can use siamese code but that creates other issues with having to use very big injectors to allow the squirts to be separate at high power/rpm. It's all compromise. No one right or wrong answer to it really depends on engine spec and use.

[mini-geek]

what amazes me with injection a 5 port is everyone goes on about charge robbing yet no one has ever mentioned it on a carb setup????

[mini13]

well actually they did... thats why scatter cams were invented.

but.... it works differently on FI systems to carbs... a carb regulates fuel dependant on the ampunt of fuel being droawn through it, Injection puts in the amout of fuel it thinks the engine needs, and within a "window", because of these windows the inner cylinders can steal the outer cylinders fuel but not the otherway round.

[mini-geek]

Fair enough.... there is a cure to it though............. 7port!! lol

[mini13]

Yep, thats what I did...

[jamie@thefatgarage]

Fair enough.... there is a cure to it though............. 7port!! lol

You are right. 7 Port is the proper cure, but I do like a challenge. I enjoy the process of making stuff work, plus it will be a good cheaper alternative for others without the budget for more expensive conversions. Once I've done the 5 port version of mine I'll be too tempted to resist 7 ports or crossflow/16v...

[mini-geek]

I'm fitting the SC 5 port kit, fitted the tank last week, just need to run fuel pipes and a bit of electrical string.. should be picking the kit up at Bingley if the bank balance can take it.

[mini.30]

I'm fitting the SC 5 port kit, fitted the tank last week, just need to run fuel pipes and a bit of electrical string.. should be picking the kit up at Bingley if the bank balance can take it.

I am unfamiliar with this kit, can you tell me more please?

Thanks
Mark

[mini-geek]

I can tell you a bit but, I don't know all that much myself, they Haven't even sold one yet.... they are going to bring out a MPI conversion at some point so that may be your best option, there's a video on the homepage.

http://www.specialis...mponents.co.uk/

[Granmas_car]

i looked into running megasquirt on my race car but i couldn't find anyone willing to map it locally i ended up going with emerald and i can say its one of the best choices i ahve ever made i cant fault the service or the quality of the actual unit and the advise i got on were to go next in terms of tunnig has been invaluble

[mini.30]

Where did you buy your emerald setup from?