to be carburated or not to be?
04-19-05, 10:12 PM
#26
Senior Member
They need to burn a specific fuel mixture, too lean and they will melt; especially behind a rotary. A rich motor will run much lower exhaust gas temps. As for the cost of Megasquirt, I just ordered a kit from www.diyautotune.com and it was $140 with shipping. You have no need to upgrade your injectors as they already run the car rich as hell. After this mod the only restriction in your intake is the lower intake manifold. It also offers complete 3D mapping of fuel and ignition (trailing still isn't finished with a split but it's close), a 12X12 map (with newer FREE firmware), 3 rev-limiters and a bunch of other cool stuff.
Grant
www.msefi.com
Grant
www.msefi.com
04-19-05, 11:54 PM
#27
Originally Posted by PaulFitzwarryne
The problem with getting a true picture of the carb/efi differences is the ignorant comment by people without knowledge.
flamin-roids--- 40-60 hp better with carb---- absolute nonsense!
RVseven--- does not seem to know you tune the efi ecu not buy a new one! You can store different settings and quickly change the ecu map for different conditions.
An efi will be some 10% more powerful than a carb over the rev range. However the difference is not so great at peak power, only about 5%. If you are only interested in peak dyno results the difference is small, but for the 1/4 mile the efi will be far quicker. In addition fuel consumption with efi is lower.
For a typical independent view read John Angas in Mazda RX-7 Performance Manual
"Watching both systems at work on the same car, the results were not surprising. With the Holley 0-60 times were around 7 seconds, but after the Efi system was properly tuned it shaved a full second from this time, plus there was a slight improved gas mileage"
At one time few people knew how to set up efi system because factory settings were very conservative. Today , excellent maps are available to set up performance efi very quickly. Often these can be downloaded from the internet saving money from going to a tuner.
Working directly on a carb has some personal satisfaction going partway to offset the knowledge it is less efficient than efi.
flamin-roids--- 40-60 hp better with carb---- absolute nonsense!
RVseven--- does not seem to know you tune the efi ecu not buy a new one! You can store different settings and quickly change the ecu map for different conditions.
An efi will be some 10% more powerful than a carb over the rev range. However the difference is not so great at peak power, only about 5%. If you are only interested in peak dyno results the difference is small, but for the 1/4 mile the efi will be far quicker. In addition fuel consumption with efi is lower.
For a typical independent view read John Angas in Mazda RX-7 Performance Manual
"Watching both systems at work on the same car, the results were not surprising. With the Holley 0-60 times were around 7 seconds, but after the Efi system was properly tuned it shaved a full second from this time, plus there was a slight improved gas mileage"
At one time few people knew how to set up efi system because factory settings were very conservative. Today , excellent maps are available to set up performance efi very quickly. Often these can be downloaded from the internet saving money from going to a tuner.
Working directly on a carb has some personal satisfaction going partway to offset the knowledge it is less efficient than efi.
generally speaking ... of course.
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