megasquirt and sensor question

[Shadow24V]

if you run MS, then unless the ECU kills the fuel pump or something, then you should be able to exceede the "governed" speed. i would think that it is goverened by yanking spark or not allowing more fuel in. *shrugs*

[87turbodance]

Killing the ASD relay effective turns off the ignition coil and fuel injectors and fuel pump. I dont know if that is what factory ECU does but it would certainly work. With MS this would be no problem as long as the factory ECU is gone.

I will be starting my MS install very soon. I have bought another daily driver (97 TranSport) so the MS is a go

[m90daytona]

Quote:

Originally Posted by m90daytona i just had a really good idea, i never knew before how the ecu shut down the vehicle for the top speed governor but if it uses the asd relay (pretty sure it does) then you can use a switch to manually ground the relay and eliminate the fuel cut. then, for a cheap boost set-up, you could run an fmu and msd 6btm and probably get really good results. plus, the btm has an adjustable rev-limiter for safety reasons.

i didnt quote this for me i quoted it for someone who doesnt want to run ms but still wants to eliminate the speed limiter.

[R/Tony]

Quote:

Originally Posted by 87turbodance Killing the ASD relay effective turns off the ignition coil and fuel injectors and fuel pump. I dont know if that is what factory ECU does but it would certainly work. With MS this would be no problem as long as the factory ECU is gone. I will be starting my MS install very soon. I have bought another daily driver (97 TranSport) so the MS is a go

which MS will you be using ?

I will use the V3 board with MSI so I can use MS Extra code .. I hope I will be installing this soon.

[87turbodance]

Quote:

Originally Posted by R/Tony which MS will you be using ? I will use the V3 board with MSI so I can use MS Extra code .. I hope I will be installing this soon.

I have a V3 board that I'm assembling right now. I'm probably going to order a MS2 daughter board for it though. I'm not sure yet though. I need to use extra code for my application because I plan on staged injection and water injection using 12 fuel injectors for fuel and 6 stainless flex fuel injectors for water. I hoping the extra code for MS2 gets finished soon. I might run with the MS 1 Extra code initially. The plan also involves heads and intake off a 2.5 or 3.0 SOHC 24V with an M90...

[Shadow24V]

how are you going to fit/modify the 24v upper intake so there is enough room for the M90? im kinda curious as ill ahve that problem myself

[87turbodance]

I have yet to mock this up but my vision involves cutting off the stock plenum. Shorten the runners if required. Then weld a box aluminum plenum on the end of the runners that also has a flange on the bottom that will bolt to an upside down M90. I don't know if it will work. TB will be on the M90 like on a GM 3800 setup. This will be a suck through setup. There will be three fuel rails on the Intake. Original fuel rails with stock sized injectors. A second fuel rail with larger injectors (staged injection) and a third rail near the plenum with 6 flex fuel injectors running water injection that kicks in under boost. The water should work just as well as, if not better than, an intercooler. I hate routing intercooler pipes. I need to keep my A/C. The car wont be driven until the summer so I'll have some time to mock things up. I have access to a mill at work and I have a machinist buddy. The first problem will be getting the 2.5 heads on the 3.0 block and getting the timing belt / water pump to work. I was also hoping to adapt a late model 2.5 Crank position sensor if possible. It depends what can be made to work.

*Edit. The second fuel rail / injectors probably wont be needed for the boost levels that an M90 puts out so I'll omit it if it becomes too difficult.

I need to pick up an intake so I can do some measurement. I'll do up a solid works drawing when I get everything figured out. If the head / intake swap works I'll take lot of pictures and document everything.

[87turbodance]

I wanted to mention... when you start programming your MS go easy on the timing if you're running the 24V motor. Pent roof combustion chambers don't require anywhere near as much timing as the 2 valve heads on the 12V. Also a little water injection goes a long way if you have knock problems.

My 2 cents

[Shadow24V]

note taken on timing, (have to smap the flywheel first...) my thoughts were to do a suckthrough TB on teh M90, pipe it to an I/C and make up a plenum with some short runners right in teh valley to bolt to the lower manifold, with the inlet on teh passenger side for ease of rounting I/C pipes. A/C isnt an issue as it was dead when i bought the car and i removed it to fit the 24v in my shadow/duster.

you will; be a lot better off with boost with the 12v bottom end than i will be with the 24v bottom end, so running 10-15lbs boost on the M90 should be easy. ill have to figure out the ratios to get ~8-10 lbs MAX out of an M90.....

[Ondonti]

Quote:

Originally Posted by 87turbodance I have yet to mock this up but my vision involves cutting off the stock plenum. Shorten the runners if required. Then weld a box aluminum plenum on the end of the runners that also has a flange on the bottom that will bolt to an upside down M90. I don't know if it will work. TB will be on the M90 like on a GM 3800 setup. This will be a suck through setup. There will be three fuel rails on the Intake. Original fuel rails with stock sized injectors. A second fuel rail with larger injectors (staged injection) and a third rail near the plenum with 6 flex fuel injectors running water injection that kicks in under boost. The water should work just as well as, if not better than, an intercooler. I hate routing intercooler pipes. I need to keep my A/C. The car wont be driven until the summer so I'll have some time to mock things up. I have access to a mill at work and I have a machinist buddy. The first problem will be getting the 2.5 heads on the 3.0 block and getting the timing belt / water pump to work. I was also hoping to adapt a late model 2.5 Crank position sensor if possible. It depends what can be made to work. *Edit. The second fuel rail / injectors probably wont be needed for the boost levels that an M90 puts out so I'll omit it if it becomes too difficult. I need to pick up an intake so I can do some measurement. I'll do up a solid works drawing when I get everything figured out. If the head / intake swap works I'll take lot of pictures and document everything.

I would seriously suggest spraying alky before the rotors on the m90 regardless of your other plans

[87turbodance]

Quote:

Originally Posted by Ondonti I would seriously suggest spraying alky before the rotors on the m90 regardless of your other plans

Why's that?

[m90daytona]

supposedly it "fills" the gaps between the rotors and provides more boost plus cools the charger.

[87turbodance]

Hmmm.. How good is it for the rotors, though?

[Shadow24V]

i thought that the air charge AFTER the S/C was hot due to compression, wouldnt spraying alky/water/nos AFTER be better?

[m90daytona]

its a theory that i am not to sure about but have heard kicked around on diffrent forums. alot of the heat from the air isnt from it being compressed, its from the heat of the m90 itself. you have to remember the m90 makes more heat than a twin screw s/c and some turbos even though it doesnt really make as much boost. its a good "cost effective" way of supercharging but its really not that efficient. either way i dont see how it would be "bad" for the rotors.

i havent done to much research on water/alk injection because i dont plan on using it so you may want to search the web for some better info. thats just some stuff i have read here and there about it.