Thats a bummer But this is where you see the benefit of running a cheap automotive engine, 1 day in the shed and you will be back on the river.If your South Island wreckers are too much of a rip off I have a j30 you can have? Freight will cost a bit tho.I agree with Jeff, detonation likely cause......Do you have an oil cooler? 90?c is pretty cool unless you were just cruising along.
1 day to put a new motor in and three days to clean up all the oil and engine shrapnel in the engine bay!!!!
Can vvt increase airflow beyond the carburetor jets or fuel pumps ability to supply enough fuel? The joys of experimental development aren't without challenge....
I can't believe you tuned it (sort of) without a wideband. When I am way off or something goes wrong the wideband goes off the scale lean (17:1) before it misses and loses power. Same as rich, it's at 10:1 when I can notice it...Another thing to consider is oil pressure and v tec engagement.It sucks up a fair bit of oil to engage. I had a L15a with the same puttz vtec that I hard wired so was permanently on but at idle it didn't quite have enough oil pressure to hold vtec in and it would out occasionally at idle. There is an additional oil pressure sender by the vtec solenoid and in the car, the ecu wont engage vtec if oil pressure is too low.When you were mucking around with your window switch possibly it could have starved engine of oil? Not likely but worth looking into?
In my defence I was running rich prior to opening up the vtec- I had been tuning with the wideband, it was working then it got wet, installed a different brand (AEM not Innovate) and it was working showing 13.5 which isn't lean in fact for NA bang on the money- never felt a miss and it was running great- I still think its a combination of factors- loss of oil to the big end, I am also noticing oil pooling in the heads because of engine angle so am wondering if I am pumping a lot up of oil into the heads and it's reducing the sump volume, thus starving the pickup, add this to the vtec needs I simply may not have had enough in the system- I am running a remote oil cooler- pretty sure its plumbed correctly (in through the filter center- out through the side and then through the HE and back to the block. If I was running super lean then I am sure I will see evidence of it across more than one cylinder.
13.5 is too lean at wot. 12.5 would be better
Mmm. Would you run a ls engine at 13.5 afr wot. I wouldnt.
Good morning all, apologies for the silence, but life. Anyways I am about to put in a j35a? (think its a3 could be a 1) that I picked up in Christchurch- it's much easier to install this engine than muck about with a whole new exhaust. I am currently altering the sump to shift the pickup to the rear and then it's ready to try again.I had a thought about actually putting this engine on a dyno- I seem to remember that someone in Christchurch used to have a jet unit attachment for their hub dyno? Does anyone recall who and out of curiosity has anyone tried to tune an engine with it?
