2533 type 4 megasquirt build
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Passatman
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Re: 2533 type 4 megasquirt build
That crank looks strong, very nice build.
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66brm
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Re: 2533 type 4 megasquirt build
How does the ECU identify the crank angle with evenly spaced slots in the flywheel? Don't they require a "missing tooth"?
Looks to be an awesome build
Looks to be an awesome build
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Piledriver
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Re: 2533 type 4 megasquirt build
A missing tooth or an extra sync pulse from the distributor will work with a non-missing tooth wheel.66brm wrote:How does the ECU identify the crank angle with evenly spaced slots in the flywheel? Don't they require a "missing tooth"?
Looks to be an awesome build
For sequential the sync pulse is required, and yes, sequential matters.
I'm using the existing 6 holes in the back of the flywheel and a modified dist.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
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warp
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Re: 2533 type 4 megasquirt build
I guess the pictures don't tell the whole story. 
I'm not doing sequential, at least not right now. My configuration will be a wasted spark with coil near plug. As shown in the picture below I have removed one tooth to create a 36-1 pattern on the back of the flywheel.
If i go sequential and real CNP some day I will most likely put another sensor in the block to trigger off the cam gear for the sync puls, but it will not be this year.
I'm not doing sequential, at least not right now. My configuration will be a wasted spark with coil near plug. As shown in the picture below I have removed one tooth to create a 36-1 pattern on the back of the flywheel.If i go sequential and real CNP some day I will most likely put another sensor in the block to trigger off the cam gear for the sync puls, but it will not be this year.
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Last edited by warp on Fri Mar 11, 2011 12:58 am, edited 1 time in total.
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66brm
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Re: 2533 type 4 megasquirt build
Awesome thanks
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RonW
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Re: 2533 type 4 megasquirt build
nice! popcorn ready and awaiting more progress reports 
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warp
- Posts: 228
- Joined: Wed Jan 18, 2006 7:45 am
Re: 2533 type 4 megasquirt build
Just a quick update.
While waiting on parts from Summit I've done a lot of "invisible work" on the cylinder covers and the fan housing. I modified the fiberglass cylinder covers quite a bit in order to close all the air gabs and make them fit nicely to the engine but it's definitely worth all the trouble (and toxic fumes) if you want a nice cool running type 4. I also did some modification and welding to the fan housing as I didn't like the huge gabs between the house and the engine block. Finally a bit of black paint made it all look nice.
I also installed the low pressure side of the fuel system all the the way from the tank in the front of the car to the engine bay in the back. My high pressure FI pump will be installed above the gearbox in the back of the car. I like having the 3 bar fuel lines as short as possible.
I got started a bit on the wiring as well by running flex tubes from under the backseat to the engine bay in both sides of the car.
I hope to get a lot more done this weekend.
While waiting on parts from Summit I've done a lot of "invisible work" on the cylinder covers and the fan housing. I modified the fiberglass cylinder covers quite a bit in order to close all the air gabs and make them fit nicely to the engine but it's definitely worth all the trouble (and toxic fumes) if you want a nice cool running type 4. I also did some modification and welding to the fan housing as I didn't like the huge gabs between the house and the engine block. Finally a bit of black paint made it all look nice.
I also installed the low pressure side of the fuel system all the the way from the tank in the front of the car to the engine bay in the back. My high pressure FI pump will be installed above the gearbox in the back of the car. I like having the 3 bar fuel lines as short as possible.
I got started a bit on the wiring as well by running flex tubes from under the backseat to the engine bay in both sides of the car.
I hope to get a lot more done this weekend.
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warp
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Re: 2533 type 4 megasquirt build
I made all the ingition wires and got the coils mounted on the back of the fan housing. The plan is to mount the breather box on the back of the fan housing too.
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warp
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Re: 2533 type 4 megasquirt build
Did finish the fuel system today, it's at tight fit in some places but I think it came out good.
I'm a bit in doubt whether to use vacuum reference on the FPR or not.
I'm a bit in doubt whether to use vacuum reference on the FPR or not.
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Last edited by warp on Wed Mar 30, 2011 8:21 am, edited 2 times in total.
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warp
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Re: 2533 type 4 megasquirt build
...
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warp
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Re: 2533 type 4 megasquirt build
Wiring loom is now finished and it's fitting nicely i think. Merge header and rear apron has been test fitted to ensure no interference and it sits perfect 2 cm under the rear apron. Unfortunately the flange is not correct so another one will be welded on to fit the A1 muffler.
I also installed two temp sensors in the cylinder head. One is the CLT for the MSII and the other one is for my head temp. gauge in the dash.
I also installed two temp sensors in the cylinder head. One is the CLT for the MSII and the other one is for my head temp. gauge in the dash.
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Last edited by warp on Fri Apr 01, 2011 10:10 am, edited 1 time in total.
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warp
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Re: 2533 type 4 megasquirt build
...more pics
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warp
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Re: 2533 type 4 megasquirt build
Did the oil system last night.
I had to relocate the oil filter as it diddn't clear the exhaust header.
The hoses to the oil filter are only temperary, AN fittings are on their way in the mail.
I think I will modify the header next winter and relocate the oil filter back to the original spot but for now I do the quick at dirty fix to get the car on the road.
I had to relocate the oil filter as it diddn't clear the exhaust header.
The hoses to the oil filter are only temperary, AN fittings are on their way in the mail.
I think I will modify the header next winter and relocate the oil filter back to the original spot but for now I do the quick at dirty fix to get the car on the road.
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warp
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Re: 2533 type 4 megasquirt build
I have been thinking a bit about the placement of one of my coils on the back of the fan housing. (Please see the attached picture, the problem is marked with a red circle)
I'm a bit concerned that the ignition wire of the upper coil is too close to the control wires of the lower coil which could lead to misfire of the lower coil or other unpredictable behaviour.
What are your experience on this matter, how fare should the control wires be separated from the ignition wires?
I'm a bit concerned that the ignition wire of the upper coil is too close to the control wires of the lower coil which could lead to misfire of the lower coil or other unpredictable behaviour.
What are your experience on this matter, how fare should the control wires be separated from the ignition wires?
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Piledriver
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Re: 2533 type 4 megasquirt build
I wouldn't sweat it unless it proves to be a problem
Ron and I are running those coils stacked/reversed, so all 4 have a HV lead next to the input, never had a hiccup.
You could add a little steel "wing" off the shroud as a shield if really needed.
Ron and I are running those coils stacked/reversed, so all 4 have a HV lead next to the input, never had a hiccup.
You could add a little steel "wing" off the shroud as a shield if really needed.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.