02-24-2011, 10:29 AM
Join Date: Aug 2007
Total Cats: 0
I recently had a good used engine swapped into my 92' Eunos Roadster (oil pump on the old engine died), at the same time I had the mechanic fit the FM dual-feed fuel rail that had been waiting to be fitted for several months.
Those were the only changes that were made. Ok, so I realise an engine change is probably the BIGGEST change you can make, but it was a straight like-for-like swap.
Since the work was done the fuelling has been off the ball, where before I used to see 11-12:1 AFR in boost I now see 13:1+ in boost.
Needless to say I've been keeping out of boost and have driven the car very little, only to check the guages and see what was going on.
I haven't yet managed to hook a laptop up to the Emanage to see what's going on (software driver issues with the cable), and I'm sure I have enough headroom in the injectors to dial out most if not all of the under-fuelling in boost.
I'd be interested in opinions on any other possible causes of this fuelling issue and any short term ways of perhaps boosting fuel pressure at the rail to ease the duty cycle on the injectors (eg fitting an AFPR or high-flow fuel pump) as I'll be going the Megasquirt or Adaptronic route before the end of this year.
92' Eunos Roadster 1.6, TD04 turbo, intercooler, 320cc injectors, FM fuel rail, stock pump, GReddy Emanage Blue, O2 clamp, running at approx 6psi.