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v8GTmac1

Megasquirt on a V8 build

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Very interesting stuff   I wonder how you program their ecu? 

So in the UK do you all have The air pump for the cats and Evap components?

 

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On 23/12/2019 at 22:00, snowrx said:

Personally, I'd avoid the complexity of staging secondaries. Just get the primaries the pulse width they need, or go to bigger injectors if you exceed your duty cycle (or fuel pressure) availability. Two additional injectors would seem like they would never give you truly equal fuel distribution to all the cylinders, unless they only come on with enough WFO airflow and heat to completely vaporize the fuel before the runners separate.

guess what, I made this new video and if you notice i'm reving a little higher then my last vid. I'm now going lean instead of rich at the higher end. 

Problem was the factory ECU was turning on the 2nd fuel pump mid way thru the REV range, upping the pressure so high it pegged my AFR to the rich side all the sudden. And the Lotus manual states the secondary fuel pump and injectors are for high speed only 🤨  130+ mph my arse. 

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On 25/11/2019 at 19:26, snowrx said:

+1 for the MS3X board, it just makes adding features easier.

Oh and I recieved this in the mail yesterday. THis will be so much fun. Full sequential on everything, idle control and boost along with water injection. i'll be able to optionally run the secondary pump and injectors progressively.

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12 hours ago, v8GTmac1 said:

Problem was the factory ECU was turning on the 2nd fuel pump mid way thru the REV range, upping the pressure so high it pegged my AFR to the rich side all the sudden. And the Lotus manual states the secondary fuel pump and injectors are for high speed only 🤨  130+ mph my arse. 

Perhaps adding an aftermarket fuel regulator with more capacity to keep pressures steady in spite of the second pump?  Or just use a one pump system with a higher capacity pump? I don't know the intent of a two pump system, unless they thought the primary was undersized. "Hydraulic" high load enrichment would seem a little vague to implement.

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On 10/01/2020 at 15:45, v8GTmac1 said:

8 LEDs to the 12v pulsed leg of each of the 8 ignitors 

run the engine at the lowest rpm and record them flashing with camera in slomotion to capture their firing order. 

Then you know which is for what cylinder and have an attack plan. Is any of this clear enough to understand? Or do I need to tackle this job and post a vid ?

 

Hi Michael,

I'd love to know the answer regarding all 8 ignitors, how soon can you post the video? 😄

This thread is fascinating. Keep up the good work everyone. 👍

cheers

-Chris

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5 hours ago, snowrx said:

Perhaps adding an aftermarket fuel regulator with more capacity to keep pressures steady in spite of the second pump?  Or just use a one pump system with a higher capacity pump? I don't know the intent of a two pump system, unless they thought the primary was undersized. "Hydraulic" high load enrichment would seem a little vague to implement.

Yes Aeromotive is the one who makes an adjustable FPR for the Chevy fuel system we use.

  Bigger injectors then I already invested in is another thought.

Bigger single fuel pump as well and Leave the secondary in place if the 1st leaves me stranded. 

 

Im thinking the reason for the complexity was to have smoother control of smaller injectors rather then larger when at low duty cycle (idle) which in return nets better mpg. 

And perhaps the entire system is capable of 500hp as we all know the 918 can produce any day of the week and twice only Sunday.....

At this point without continued investment into experimentation, I will most likely mimic the oem setup and run it all progressively. 

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It's been running for a few weeks on Full Sequential MS3x and I couldnt be happier to drive her in this awsome weather. 

It is on 4.5psi wastegate pressure with no Duty going to the boost solenoid. 

23 degrees of timing at those boost levels but i have no idea what it should be. 

The factory ECU is currently only doing the job of working the SPeedo gauge which reads 5 MPH High. 

Currently the AC needs to be re-wired due to the oem ecu not getting a CAM signal thus no longer getting RPM readings. 

Oh and at 4.5psi the 252cc Mustang injectors have allready Max'd out the higher you go into the REVs. 

I have the secondaries and the 2nd F/P hooked up for staged injection but needs more seat time with the laptop to tune it's progressive nature, it gets really rich!

https://www.youtube.com/watch?v=K6M4RZW7gpg

 

Edited by v8GTmac1
Here is a good video.

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Nice work. It should be super easy to get the wheel speed and A/C hooked up to the MS. For speed, you just need to change the sensor type at the rear wheel and run one extra wire (standard is VR sensor and MS needs hall effect). You can then remove the stock ECU completely.

Another benefit of having the speed go through the MS is that you can also fill out the gearing info. That way, the ECU can work out what gear you are in by comparing speed and RPM. Opens up opportunities for things like boost vs gear etc.

Edited by cammmy

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5 hours ago, cammmy said:

Nice work. It should be super easy to get the wheel speed and A/C hooked up to the MS. For speed, you just need to change the sensor type at the rear wheel and run one extra wire (standard is VR sensor and MS needs hall effect). You can then remove the stock ECU completely.

Another benefit of having the speed go through the MS is that you can also fill out the gearing info. That way, the ECU can work out what gear you are in by comparing speed and RPM. Opens up opportunities for things like boost vs gear etc.

I like boost Vs gear. 

Although being that the speedo is a universal VDO gauge, 

it can be calibrated directly to the VSS

or I can order a VDO GPS module. 

Atm I will leave as is but I do need to ad a relay to turn compressor on and off. 

I have a output ready for turning off the AC when programmed to. 

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Quick n' Dirty Hall effect VSS install for Megasquirt-

I just epoxied 6 neodymium magnets to the periphery of the CV joint (don't use JB weld, it's got ferrous bits in it, and will get messy as it mounds up around the magnets!) and stuck a mount under the carrier fixing bolt. Generic 12V eBay hall sensor, I don't recall the specs, works fine.

 

VSS (2).JPG

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On 12/02/2020 at 19:26, snowrx said:

Quick n' Dirty Hall effect VSS install for Megasquirt-

I just epoxied 6 neodymium magnets to the periphery of the CV joint (don't use JB weld, it's got ferrous bits in it, and will get messy as it mounds up around the magnets!) and stuck a mount under the carrier fixing bolt. Generic 12V eBay hall sensor, I don't recall the specs, works fine.

 

VSS (2).JPG

I like your style and I might have to try that 

rather then tapping into the existing VSS and hindering signals going to the ABS. 

 

 

 

 

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Update for Apr

AC connection with megasquirt was a simple 2 wire connection. 

12v request from the AC pressure switch  +                                                      Compressor relay (ground) actuation

both if these taken off the ECU connector. 

 

2nd fuel pump was not being turned on for whatever reason  I fixed that and now I’m able to put the secondary injectors and pump starting at 4psi

FYI oem ecu triggers the 2nd pump practically all the time under low boost.    So if you have yours disabled !!!!! Fix that!!!

 

https://youtu.be/k_lqbtUusMw

Edited by v8GTmac1

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12 hours ago, v8GTmac1 said:

I like your style and I might have to try that 

rather then tapping into the existing VSS and hindering signals going to the ABS. 

 

 

 

 

On my GT3, the ABS and VSS sensors were totally separate. I just removed the VSS sensor and replaced it with a hall type that had the correct thread. It involved running one extra wire along with the existing two.

 

It didn't have any effect on the ABS.

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@v8GTmac1 Hi Michael, that is great progress and thinking out loud. Once you have all of this sorted will that mean you have a replacement ECU with a tuneable map for the V8 Esprits that others could theoretically use ? 😉🤗

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For others to be happy they would more then likely require PnP style connection. Have not spent any time looking for a bare ecu connector. And the factory ecu is still controlling the Speedo on mine. 

Ive mentioned before the VDO speedo is universal and VDO sells a GPS converter box. 

But yes once my fuel tables are set up to 11psi then I will be more then happy to post my tune and settings. 

Been a lot of fun finding wires. Finding the ACU relay box took me some hours lol

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That is amazing work. Huge kudos to you for persevering and finding an alternative to the factory ECU. 
 

-Chris

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