Emerald ECU mapping
Discussion
Jeff at Reworx in Portsmouth is well worth a visit. If you need any hands on help PM me as I'm only in Trowbridge, I have a wideband and a laptop should you want to put a basic map down. I've never used an Emerald EMS, but apparently Microtech are similar and I've plenty of experience there.
Matt
Matt
joospeed said:
A carb is a way of managing the fuel / air ratio .. it's just a piss poor one!
Seems to me that all this faffing around with complicated electronics and sensors and pumps and injectors is trying to achieve the same thing that a lowly SU carb achieves with a simple lump of brass.
The SU is one of the very few carbs that's any good at metering .. the webers n dell'ortos of the world are miles behind in camparison on emmisions/fuel economy.
don't be fooled by the carb's relatively simple look, they can be harder to calibrate than electronic injection if you haven't got years of experience. there's many a botched carb set-up job that's made an otherwise driveable engine a real headache. Plus with electronic management of fuel and ignition you can make even very wild cammed cars driveable as much of the camminess was down to the carb's low rev airflow / poor mixture emulsion so I'm reliably informed.
unless you're building some historic concours class winner electronic control is the way to go
don't be fooled by the carb's relatively simple look, they can be harder to calibrate than electronic injection if you haven't got years of experience. there's many a botched carb set-up job that's made an otherwise driveable engine a real headache. Plus with electronic management of fuel and ignition you can make even very wild cammed cars driveable as much of the camminess was down to the carb's low rev airflow / poor mixture emulsion so I'm reliably informed.
unless you're building some historic concours class winner electronic control is the way to go
...which reminds me: Why is it that British cars which used SUs in the home market, used Strombergs on the emissions-strangled US versions? Since a Stromberg and an SU are the same apart from the diaphragm taking the place of accurately machining the piston, I wouldn't expect there to be any difference in their accuracy.
I hear what you're saying about EFI, but I just think that EFI is a very nasty inelegant brute force solution to a problem that ought to be easy: measure the mass of air going into the engine, and mix in the corresponding mass of fuel. I know there is a huge variety of carb designs, some of them are hideously complicated and difficult to set up, but the humble SU stands head and shoulders above the crowd in terms of simplicity and effectiveness. EFI systems seem to be getting ever more expensive and complicated but they still struggle to achieve what the humble SU does with a lump of brass.
Peter,
How can a carb measure density? This is something a MAF can do very well. I like some carbs a lot but can see why efi is superior. Mind you, if emmisions weren't a problem legislation wise I'd be very happy with a 4 barrel. In fact there's a 4 barrell offering for the ls1 and it will be mega popular.
Boosted.
How can a carb measure density? This is something a MAF can do very well. I like some carbs a lot but can see why efi is superior. Mind you, if emmisions weren't a problem legislation wise I'd be very happy with a 4 barrel. In fact there's a 4 barrell offering for the ls1 and it will be mega popular.
Boosted.
justin s said:
Joo,Dave showed me the print out from the Rolling road shoot out and was grinning from ear to ear.Don't mess with antiquated watering cans,get electronic!!!!!
haha, pleased it brightened his day .. if it wasn't for emerald's brilliant little user friendly box of tricks i'd not have been able to do it
i spoke to dave on the fone the day after i think , and i think I'll frame the reply to the e-mail i sent him . 
I like dave, one of life's good guys
and i suspect that what Karl doesn't know about the electronics side of things isn't worth knowing. it's easy to see why they make such an effective team Dave is a good guy,not one I believe who is just scamming you for filling his wallet.He genuinely does his best to get your car set up,without un-necessary jargon crap you can get on other ecu systems for three times the price.I'm glad my car had the emerald system fitted by the previous owner,I mean,how many systems are warrantied for life like the Emerald is?.They had an 8 yr old unit in reception with a glitch,Carl will fix and it will be sent back FOC.
GreenV8S said:But engines can have characteristics which mean it is never as simple as measuring air flow, aside from heat & density, cold start, acceleration corrections. Are you saying the same for ignition? I can't see how you could get anywhere close to mapped ignition without nightmare mechanicals, and once you have a computer, you may as well stump a few tiny injectors
I hear what you're saying about EFI, but I just think that EFI is a very nasty inelegant brute force solution to a problem that ought to be easy:
Anyway, I think EFI is far simpler - much happier twiddling a grid on a laptop than pissing about with a carb.
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