How to Megasquirt your 3G Hemi
I am so glad to read your write up. I have been torn between ms3x and xfi. After your price break down you did. It opened my eyes to the truth about it all. Xfi is about the same price as ms3x when said and done. Besides sensors. There is a lot of hasle taken out of everything with xfis plug n play. I know ms3x is an awesome peice I know. Its the on your own aspect and trouble wiring ect... that leaves one hesitant. For me anyways as I'm a high powered turbo build and I need some peice of mind. I truely appreciate your write up in so many ways. I can not thank you enough.
You have a link to the guages? I was considering vdo as I didn't want autofeeders like all he rest.
I'm glad you enjoyed the write up. Though the last time I checked, the comparable Hemi XFI kit was about $3000. This can be done for $1600-$1800. Were you looking at a different XFI product?
Copy and paste of XFI vs MS3x written by Matt cramer of DIYautotune:
Here's an XFI vs MS3 comparison I put together on another site.
The FAST XFI and MS3 are pretty similar on paper. I'm looking through
the FAST manual to see if there's any major differences, and here's what
I have noticed. Look like some points land in favor of FAST and some for
MS3. Overall, the MS3 has a bit more precise fuel control.
1. The fuel and ignition tuning process is almost EXACTLY the same for
the main fuel and spark maps. Unlike some of the other John Meany ECUs,
the FAST system uses a VE type fuel table, which MS also does.
2. The only acceleration enrichment option in FAST is a "accelerator
pump" type enrichment; MS3 (and MS2) also has a model based acceleration
enrichment that is a bit more sophisticated. This generally has very
little effect on a drag car; it's more useful on a road racer.
3. FAST has more nitrous channels (4 instead of 2), while MS3 can run
its nitrous control progressively.
4. FAST boost control is closed loop only. MS3 (and MS2) has closed and
open loop boost control. MS3 can also adjust boost as a function of
vehicle speed - although this is not allowed in the NHRA.
5. FAST has a dedicated EGR function (this could be done with a generic
output on MS3).
6. FAST has a time based traction control option to meet NHRA rules
against monitoring wheel speed.
7. FAST individual cylinder corrections are a fixed percent or degree.
MS3 has 6 x 6 tables for each cylinder.
8. FAST has 8 extra analog inputs; MS3 has 3 to 5 depending on setup.
9. FAST can switch between 4 internally stored maps; MS3 has 2.
10. FAST does not support MAF input or blending alpha N with speed
density. MS3 (and MS2) supports both.
11. FAST does not seem to have the same sort of gradual staged injection
capabilities as MS3 and MS2, although I could be wrong.
