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v8GTmac1

Megasquirt on a V8 build

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As mentioned here it is for those who might find interest, THis is Megasquirt 2 soon to be running semi-sequential fuel and wasted spark LS1 coils , running on 7 cylinders with the stock ECU still hooked up for running a bunch of stuff

Fans

AC

Tach

SPeedo

Emissions

Secondary injectors

Boost control

Idle control

Electric water pump

 

 

 

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V7GTmac1?  Come up a coil short, or are you really running one cylinder on OEM and 7 on Megasquirt?

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😝  it has OEM ignition problems. I've given up on the factory ignition system even though I can fix it for a $300 and some labor. 

 

Not to mention all other oem tuning issues. Dont need emissions here and I want to control my water injection and turn the boost up in the winter. 

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Looking forward to build/tuning details...

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This video is with all 8 injectors hookedup on Semi-sequential. I would need MS3x expansion card and case to do Full Sequential. Baby steps. 

It started on the 1st crank with no base tune, no Wideband 02 linked up and still only 7 cylinders firing.  

Now that I got this far, i've tore into the plenum, ripped out the coilpacks and started my conversion. 

 

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  1. I’m very very hesitant to post pics of my build that deviate from the originality of the car but in hope of someone seeking the road less traveled ....here is just a few

Water injection nozzles 2gph  and I removed a couple things if anyone cares to notice  

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Edited by v8GTmac1

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It's great to see other peoples ideas being brought to life.

One query: how will you measure the true IAT if the jets are directly in the plenum?  Looks like you are using the standard compressor duct IAT location.


1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Yeah I don’t know if there is an easy way here. Unless of course I sprayed water before the turbos?

i think the more accurate way would be EGT.  But I already have too many gauges hooked up. 

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Why not install the jets in the compressor ducts between the turbo and throttle body?  It would still be upstream of the IAT sensor.


1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Didn’t seem like enough meat to drill and tap the 1/8npt. 

The nozzles might be small enough I can add 2 more 

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That's where I had mine installed on my other V8. I think I just tapped into the duct which did work but if I did it again I would consider having a small disk welded in place to provide more material to work with.

FYI I used an ERL Aquamist with an FIA2 that took a trigger from a fuel injector to add the water when other conditions were met but I can't remember what they were.

cheers

-Chris

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1 hour ago, cweeden said:

FYI I used an ERL Aquamist with an FIA2 that took a trigger from a fuel injector to add the water when other conditions were met but I can't remember what they were.

Most modern systems have the option for triggering off the MAP 


1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Nice one, I have an MS3/X on my GT3. The main trouble I've had is that the only place anywhere near me that will touch those ECU's isn't cheap. I also had an injector driver fail and hold wide open on the X card, but I managed to de-solder it and get a new one on there.

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That’s scary. How did you know the injector was wide open ?

ms3 has a diagnostic for this?

 

 

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I got some updates .....

 

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Now I have a place to put stickers!

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f4e6b59536fc490caeaedb79d61f54d9.mov

Edited by v8GTmac1

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Too many gauges but great piece of mind 

And originality was long gone. 

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Edited by v8GTmac1

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10 hours ago, v8GTmac1 said:

That’s scary. How did you know the injector was wide open ?

ms3 has a diagnostic for this?

 

 

I guessed due to loss of power, white smoke and stench of fuel from the exhaust. I then used the JimStim to diagnose which one was faulty. If you don't have a JimStim, I would highly recommend getting one.

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Yet another idling video with updates, No driving yet unfortunately waiting on WIFI adapter to start tuning.  Running much smoother now, last video was on 6 cylinders again. 😆

just some incorrect soldering inside my computer. 

 

Edited by v8GTmac1

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I ran a cable from the stock ECU location through the sunroof and into the cabin for tuning. You can do it without needing to make any holes.

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Well either a CKP or Cam sensor is dying or the Bosch ECu doenst want to share those signals with Megasquirt. 

I'll know for sure after this new conversion is done and running without stalling issues after warmed up. 

This is turning out to be more complicated then I had planned but I must keep going. 

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Edited by v8GTmac1

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Hmmm, I would highly recommend ditching the factory ECU. The MS2 should be able to do most of those with the right add-ons; or going to an MS3-X would allow you to do all of them. If 

I was going down this route again. I probably wouldn't bother worrying about the secondaries though. Which is the main thing that the MS2 can't do. Just size your primaries accordingly.

How are you going to control the fuel properly with two ECUs? It sounds dangerous.

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The secondaries should be taken out of the equation. I want to find the correct fuel line fittings Chevy Supplied Lotus to eliminate and bypass them all together. 

The factory ecu does a good job controlling the idle,tach,secondary water pump,boost and I believe is needed for both fuel pumps. 

I have ms3 bit never bOught ms3x daughter card for full sequential.  But now this latest mod I should be able to go full sequential and save some gas  not to mention run a lot smoother. 

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How have you got it setup so that the Stock ECU does idle but the MS controls everything else?

If you already have the MS3 then I would get the X add on and ditch the factory ECU entirely. It will hugely simplify the setup and reduce the chances for issues. If there's one thing I've learned, it's that wasted dyno time due to ECU issues is a lot more expensive and frustrating than spending a bit more time and money up front.

the MS3/X should do everything you need and more.

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