MicroSquirt.com read only forum (Jan.15,2018)

if you're in a hurry and racing, run the sc all the time for the event.

at 15% throttle going up a hill you could use the boost.

Ideally map switched like factory is the best solution, but making a timer code is beyond me these days.

You could use the msns-extra code with the new hires injection ...

cool, run the itb's... sucks to standard manifold!

tvis when in working condition and activated correctly will always provide an increase in down low torque.
the ports are just too big on the bluetop 4age.

you can remove it, and it will be fine, but you will lose the ability to generate this extra torque.
Make sure you remove the locators in the ...

Hey man, I hear your pain...

I've spent ages with my new motor, 300 deg cams, 4 throttles, 1600cc..

I've been running map based ITB setups for the past two years, but nothing with as wild a cam. Always 10-20kpa spacing then closing up from 80, ending with 2kpa from 90->102.

I use the dampeners ...

almost sounds like your fuel pump is not keeping up with your injectors....

try flow testing it into a bucket and measuring how much you get.. it's not exact but has worked out pretty good for me for comparing fuel pumps, backed up with lean outs like you describe.

be careful

2sq alternating and i think you can do it.
problem will be that it'll idle around 12:1 if you want it stable... and there are points on the ve table where you want less than idle fuel... this is going to be more of a hassle if you want perfect afrs.
If you're ok with sacrificing this, then go for ...

come to think of it, depending how much power you're pushing and what type of ignition control you require, you may find that tuning with big injectors at very low load to be a little troublesome.

You can either just run it a little rich (12:1) and live with it at these points, or use ms2 chip for ...

SD does seem pretty good. I like combining all runners and using dampener in the map line to give a good signal.

vacuum leaks will really mess with itb setup though.

you don't have as much vacuum to work with, this is a little like cams, but cams only make a sudden ve jump with rpm.

however, as ...

ok, putting that aside for a sec.

Try move your vacuum line to only tap 1,2 and 4. How's your map signal then?

A bad cyl (comp or manifold leak) can really mess with your vacuum signal on itb's.

ok, if you want to keep it, then simply tap one of the manifold runners for a feed for your brake booster.

Normally brake boosters have a bigger hose than map lines, that's why I do a separate tap of a bigger size for the booster.
You could probably get away with tapping 3 runners for map signal ...