| Author | Topic |
|---|
Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
|
|
Re: Tunning an engine
|
Fri, 12 March 2004 01:47
 
|
 |
wow, cut and paste? 
more fuel = more heat in the cat IF there is enough air to combust it... a RICH mixture has LESS residual oxygen, and will COOL the exhaust gas AND the cat.
of course, almost anyone using aftermarket ECU will realise that they are compromising durability.
driving with more than 5000rpm compromises durability!!!!
driving with more than half throttle compromises durability!!!!
people who do their own tuning should know what they are doing beforehand. some engines like to run lean, some like to run rich, and decent tuning requires more than just the dyno readout. EGT and engine temps for a start.
least gear multiplication? you mean 4th gear 1:1 ratio?
i believe a 'dyno pull' is not the best or even a good way to tune an engine!!!!!! locking the dyno at a given rpm, and then applying different loads is the way to seat the base fuel table. when accelerating and other transient conditions is where "enrichments" and "fuel trim" come into play, and often these can only really be set on the street..
you must also remember that a dyno pull in 4th gear is nothing like the fast transient pull of 1st gear on the street.
Cya, Stewart
ps, wow, look, spaces and paragraphs  
[Updated on: Fri, 12 March 2004 01:49]
|
|
|
