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

Good question! They are packaged by a company called VENOM and are high impedance (the coils measure around 14 ohms with a DVOM).

Mike

460,

I would like to compare your idle PW calculation to the one I listed on the first page of this thread. Can you tell me the following information about your setting?

Required Fuel value?
Idle VE value in the base fuel table?
The approx. vacuum at which your engine idles?

Thanks.

Mike

Thanks for the replies guys. I tried lowering the injector time in small increments down to .5 ms with no improvement. To be absolutey certain, I will swap the 550s in one more time and try again. I'll post the results.

Mike

Thinking about it further, I think I'm starting to understand my error(s). My previous calculation for idle pulsewidth looked like this:

PW = REQ_FUEL * VE * MAP * E + accel + Injector_open_time
PW = 4.9 ms * 30% * (25 kPa / 100 kPa) + 1.0 ms = 1.36 ms

My logic was wrong when I said I figured I ...

Matt, the compression is 10.5:1. When using the standard equation to size the injectors I don't see how I can get 280 HP out of even a N/A 4 cylinder (BSFC~.55) with 440 cc/min injectors and a duty cycle of 85%:

InjectorSize = (HorsePower * BSFC) / (#Injectors * DutyCycle)
(280 HP * 0.55 lb/hr/HP ...

Guys,

What are your ReqFuel values and idling VE bins? I ask because I am trying to run a set of 550 cc/min injectors in a 1.6L turbo (calculated ReqFuel = 4.9ms) and can't get it anywhere close to idling even with VE bins of 1% and ReqFuel lowered to 1ms. Needless to say AFRs are off the chart at ...

Matt,

Using the calculation example from the manual I get the following:

InjectorSize = (HorsePower * BSFC) / (#Injectors * DutyCycle)
(280 HP * 0.65 lb/hr/HP) / (4*.85) = 53.5 lb/hr ~ 560 cc/min

I realize .65 might be a tad on the high side, but from what I've read it's a pretty good rule of ...

FS,

Not to sounds terse, but most of your questions are answered in the excellent technical documentation that has been written for installing and tuning the MS EFI and is available for download on the main part of this site (Lance linked to it). It is intended to guide new users (like you and me ...

From everything I've read it's very rare that injector opening times are lower than 1ms but no, I haven't tried that. I will give it a shot. Thanks.

Mike

Greetings from Florida.

I've got a turbocharged 20V silvertop Toyota engine on which I've installed MSII V3 w/EDIS. With the thorough information in the technical manuals and the breadth of knowledge on this site, I've been able to get the car running very well and I've had a great time along the ...