| Author | Topic |
|---|
Location:
Rocklea qld
Registered:
February 2003
|
|
ATTN megasquirt users
|
Sun, 08 August 2004 09:27
|
 |
|
How do u determine what fuel percentages etc to run. Anyone running megasquirt with a 18rgeu could u please post your fuel charts or PM them to me. Got mine firing today but not sure if to much fuel or not enough or because my tps was wired wrong for the reason it didnt actually run
|
|
|
Location:
New Zealand
Registered:
May 2002
|
|
Re: ATTN megasquirt users
|
Sun, 08 August 2004 10:01
|
|
using the o2 feedback is a good start.
else: if it splutters it's generally rich...... but if it falls on it's face, it's generally lean.
you can always hold it at one point and go richer and leaner...
|
|
|
Location:
Hobart
Registered:
June 2002
|
|
Re: ATTN megasquirt users
|
Mon, 09 August 2004 03:36
|
|
you use the calculators in megatune... then fiddle... in the constants page enter your engine size, injector size, etc, then a value of REQ_FUEL will be calculated, choose alternating injection, maybe 4 squirts/cycle. depending on your squirts per cycle the REQ_FUEL maybe 8ms or something. use the VE table genrator (or the one i send you) as a starting point. Without an o2 sensor you won't have any quantative feedback, and will be very hard to tune.
i think you need to read the megamanual, this is all explained in detail in the megamanual. step by step process.
i will send my megatune settings to charles tonight. He said you dont have a MAP sensor yet, this is fundamental, it will not run without it!
www.msefi.com is very good resource for megasquirt info
cheers
Chris
|
|
|
Location:
Parramatta
Registered:
July 2002
|
|
Re: ATTN megasquirt users
|
Mon, 09 August 2004 03:47
|
|
or here is a better idea.... GO AND GET IT DYNOED
i tell this to everyone whats a few hundred compared to a new motor. As far as im concerned its the only way to tune a car, you will get the most acurate air fuel ratios, and also you get a fugure of hp, kw and NM. you dont get figures on the road.
|
|
|
Location:
Hobart
Registered:
June 2002
|
|
Re: ATTN megasquirt users
|
Mon, 09 August 2004 03:54
|
|
| MR. 2 wrote on Mon, 09 August 2004 13:47 |
or here is a better idea.... GO AND GET IT DYNOED
i tell this to everyone whats a few hundred compared to a new motor. As far as im concerned its the only way to tune a car, you will get the most acurate air fuel ratios, and also you get a fugure of hp, kw and NM. you dont get figures on the road.
|
that wont help him get it started 
and its pretty easy to get it tuned on the road using datalogs and specialised tuning software which analyses the feedback from the o2 sensor. targetting any other AFR than 14.7:1 is hard without wideband o2 though. so for turbos, wideband o2 is important, but not essential.
nice to get it running very nicely without spending buckets of money on dynoes, especially since the megasquirt is budget system. my car was converted from carbies to efi and tuned sweet, all for well under $1000, that includes ALL parts
|
|
|
Location:
New Zealand
Registered:
May 2002
|
|
Re: ATTN megasquirt users
|
Mon, 09 August 2004 04:10
|
|
I would use 2 squirts alternating.
And as said.... the Calculator in Constants for REQFUEL.
You should be able to get it to reliably kick.
But, it may shortly or straight away die again.
Set afterstart enrichment at 30% and for 200 cycles..... to get you started.
Then, it'll just be a matter of tuning the VE points around your Idle to get it to idle.
separate out the functions, and understand each one separately. 
|
|
|
Location:
Rocklea qld
Registered:
February 2003
|
|
Re: ATTN megasquirt users
|
Mon, 09 August 2004 09:45
|
|
|
i dont know to much about this myself. thats why i did a deal with charles to build it and get it running. We didnt think the o2 sensor would be needed to get it running but i do have one that will be wired up before we try again. But once charles has the fuel notes it should make things a little easier but i will go and look through all the calculations right now and see what i come up with.
|
|
|
Location:
Brisbane
Registered:
February 2003
|
|
Re: ATTN megasquirt users
|
Mon, 09 August 2004 12:30
|
|
hi folks,
i've got a base (VE) map from Chris (thanks!!) - i'll use that as the target.
I used this <http://www.megasquirt.info/manual/vetable.htm> to generate a VE table from this data: 135Bhp @ 5800rpm; 127lb/ft @ 4400rpm; idle=1000rpm, vac=22mm/Hg - but the numbers in the lower KPA rows were 2-3 times higher than Chris's table.
we had REQ_FUEL at 16Ms at 2 squirts simultaneous - obviously easy to fire but not too much unburnt fuel left when it stopped 
we'll have the map sensor hooked up (and the TPS) next time, and with any luck the O2.
advice wanted: i wired the two banks of injectors in these pairs 1/4 and 2/3 - this correct? i couldn't find anything on any of my wiring diagrams that indicated if this was right or not? similar assistance welcome when i have to rewire the 1G injectors
btw: we're not going to do any driving in it just yet (no steering for a start) - so O2 not essential yet.
I will be taking Mr 2's advice for my RA40 - dyno-tuned/tweaked once engine is in reasonable state of tune - tho i'll have to find a brisbane dyno that either knows abotu Megasquirt or lets me participate in any ECU tuning.
but it's this stuff:<http://www.megasquirt.info/manual/mtune.htm> that i want to get thru before spending time on a dyno.
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: ATTN megasquirt users
|
Mon, 09 August 2004 23:27
|
|
wow guys, sounds like you have been busy! Good to see that some progress is being made! Sounds like a whole barrel of fun!
Cheers
Wilbo
|
|
|
