man, so much goin on here, thanks for all the replies...
I know you don't want to reflash the computer, but I think in the long term full adjustment of fuel and timing is needed on any modified motor. I have hacked a EJ22E and a EJ20G ECU and can edit the tables in RomRaider. The hardware needed costs about $150, a daughterboard for the ECU and an EEPROM programmer. It'll take longer than Friday to get that running, though, but it's a good alternative if you have some brains but not a lot of money.
damn, i didnt realise this had been done - if i had known 2 months ago that you had figured this out i might have attempted it. probably still will try it this fall when the pressure is off..
If driveability isn't an issue you can just unplug the knock sensor and it should go into "limp mode".
do you know off hand what 'limp' timing is? and does it even apply since this is an early 90's computer?
well, if you unplug the crank sensor you do not get spark.if you unplug the cm sensor you do not get fuel.unplug the cam sensor, spray in some starting ether, and it should run for a few seconds.
i will test this at ivans this week. john, you should read that 'scope link, it may change your mind.
I'm not sure how much retard is needed for nitrous, but I suspect 9 degrees isn't enough. Also I suspect Matt is running an EJ25 block on an OBD-I EJ22E ECU, so there's probably too much timing even without nitrous.
Correct about the block and heads combo. but the new rods are shorter, so we have a reduced compression ratio of an unknown amount.
unfortunately, i have no idea how much retard we need either. but i will say that the knock sensor does not do the full job when you run 10lbs of boost and anywhere from 30 to 50 hp/cylinder of nitrous at WOT. Even last weekend when we ran no turbo (heavy heavy loads though), the best we could do was run a 70 shot (17.5hp/cyl) without having bad nitrous pops out the intake.
but the sanity (or insanity) of the crapinator isnt a rabbit hole i want to go down right now... all i'm hoping for is a way to pull timing for the race this weekend...
your 'scope link shows a base timing of 10 DBTDC , is there a way we could lock the car at that, and test it? it sounds waay retarded, but with enough boost and nos, it might work.