opinions pls MegaSquirt down the road, What should stay, what should go Options

[cgnj]

Hi,

This is regarding the 73 that I purchased for my son.
It appears to have been a 2.0 appearance group car that is currently sporting a W code 1.7, (claimed to be 1.8) pulling 125-135 in all holes.
I have a complete GA motor with FI to donate to this car. FI condition is unknown.
Have running 1.8 with Ljet.
Have 76 2270 with 45 Dells.
Will hold one motor.
Looking down the road, I'd like to Mega Squirt or Kit Carlson the 2270 at some point.

Which motor stays, which goes?

Carlos

[mightyohm]

Good points Mike. My concerns were the lack of manifold vacuum at low RPM as well as the change in vacuum with throttle position/engine load.

When the 911 switched to CIS injection they got rid of all the hot cams that were used in the 911E and S. They were stuck with something about as mild as the 911T cam. I think they used cams like that for the rest of the aircooled 911's life. Nothing very impressive - not like the peaky 8000 rpm 911S profile that everyone loves. They were probably forced to do this for two reasons - emissions, and compatability with the airflow or vacuum sensing fuel injection systems.

This story about the 911 raises concerns in my mind about the ability of an FI system based on engine vacuum to cope with anything more aggressive than the most mild street cam.

I don't like the idea of being restricted about what cam I can run based on my FI system.

For the type IV I don't think we usually want a very aggressive cam anyway for a street motor because the engine just doesn't want to rev like a 6 does. So it's not as big of an issue.

Could you run a web 86a with a megasquirt? An 86b? 494? Where do you draw the line? Let's not consider the alpha-N case for now since you are sacrificing drivability there.