big stuff 3 or motec 800
- Thread starter Muzy
- Start date
Big stuff 3, if you have one the motors it is programmed for (mostly Domestic V8 in North America) it is a great piece.
The MoTeC on the other hand is hands down better just from configurability point of view from a software perspective. Add the other MoTeC goodies on the CANbus and it becomes untouchabel save by Race EMS. In the end though, it depends what your local tuner knows how to install and tune. Install is crucial as the MoTeC has to be wired completely save if you have an STI or EVO VIII or IX.
The MoTeC on the other hand is hands down better just from configurability point of view from a software perspective. Add the other MoTeC goodies on the CANbus and it becomes untouchabel save by Race EMS. In the end though, it depends what your local tuner knows how to install and tune. Install is crucial as the MoTeC has to be wired completely save if you have an STI or EVO VIII or IX.
Thanx Figgie, I was under the impresion the Big stuff 3 abilaty to learn would be sufficent
but it would need somthing to start from.
The Motec is looking very apealling plus we have at least one member ussing it with great
results. As sequntale fule and spark will be a must. Would apeare my closest dealer is in
BC, about a 800 km. More time to learn more. muzy
but it would need somthing to start from.
The Motec is looking very apealling plus we have at least one member ussing it with great
results. As sequntale fule and spark will be a must. Would apeare my closest dealer is in
BC, about a 800 km. More time to learn more. muzy
figgie;1199372 said:sequential fuel and spark a "must"?
Not unless you are running 11,000 rpm and above it is not
I would imagine that you are referring primarily to spark (11 000 rpm)
And no, I have no desire to turn an engine that speed.
My concern is with fuel management as batch fired injectors are not a
good idea when we add larger injectors plus put more squeeze to the air.
As far as I can determine the mk3 batch fires 2 injectors, while not as bad
as what is done with the GM 4.3. Is still not good fuel management, and will
lead to problems.
If I am incorrect please advise a good source for info, as all my recent
searches just regurgitates the same results. Thnx for your time muzy
Muzy;1202854 said:I would imagine that you are referring primarily to spark (11 000 rpm)
And no, I have no desire to turn an engine that speed.
My concern is with fuel management as batch fired injectors are not a
good idea when we add larger injectors plus put more squeeze to the air.
As far as I can determine the mk3 batch fires 2 injectors, while not as bad
as what is done with the GM 4.3. Is still not good fuel management, and will
lead to problems.
If I am incorrect please advise a good source for info, as all my recent
searches just regurgitates the same results. Thnx for your time muzy
You are incorrect.
Batch fire in the 7m is just fine.idling of big injectors MIGHT be an issue as you need two small pulses per rpm instead of 1 longer one per 2 revs. Batch fire can support power as long as the window of injection is within the timeframe of the injector which, one more time. Unless you are spinning the motor to 11k rpm. Not happening
Well Figgie it would appear that your answer is in the majority by a landslide.
As your answers gave me new insight to search. And search as I may the
only advantage appear to be around idle and were marginale at that. But on
the bright side my understanding of these fuel systems has increased and
am better equipped to build a strong running engine. Thnx. muzy:icon_bigg
As your answers gave me new insight to search. And search as I may the
only advantage appear to be around idle and were marginale at that. But on
the bright side my understanding of these fuel systems has increased and
am better equipped to build a strong running engine. Thnx. muzy:icon_bigg
Muz: The difference being with large injectors (1000cc+) it'll have some chance of idling below 1300rpm wired sequential.
IJ.;1204530 said:
correct
in short...
trying to open the big injectors for 2ms at a time per rev in batch fire v running the injector for 3.6 ms once per cycle (2 revs). The 3.6 ms is easier to do with most standalones unless they have an exceptional fuel injector driver channel.
The response time has more to do with the injector design itself than the standalone (though a good driver helps, that is for sure). Batch works fine, but technology has moved on and sequential offers better idle quality and better light/part throttle torque if your injection timing is properly setup. In my opinion, spending money on a quality standalone and NOT going sequential is simply a waste of money in a way (at least for a street car). For a race car, there may be valid reasons to go batch (though with a few road race cars I tune, fuel consumption/throttle response are such keys that it again almost dictates we go sequential).
Thnx IJ, that makes sense otherwise engine would be over rich.IJ.;1204530 said:
I was assuming the motec has an exceptional fuel injector driver, or wouldfiggie;1204770 said:
that be an add on? I was running some numbers and came up with 3.1ms
per cycle @ 7500rpm. Shoot me your formula mine is with flaw perhaps:icon_bigg
John Reed;1204782 said:
Ok, sounds like motec will be my friend. I will probably contact a rep. and
hopefully they will be able to provide me with what requirements(hardware)
I need to run there system in my car.
I expect to be ready to incorporate this stand alone system in about 6mounths from now. So still much to learn.
Muzy;1206224 said:
Well if you need a Supra friendly rep, I am a Motec dealer also.
But I am also here if you just need questions answered, I am not on here daily but I try and make my rounds of a few forums.
John Reed;1206227 said:Well if you need a Supra friendly rep, I am a Motec dealer also.
But I am also here if you just need questions answered, I am not on here daily but I try and make my rounds of a few forums.
LOL, I figgerd John. Good to know. Will use link in future. muzy