I reckon this has been asked before, so I'll post here instead of a new thread.
First of all, hey y'all.
Went ahead about a month ago and did a massive financial mistake, I bought a 1992 S13 200SX with a CA18DET in it.
It's got most of the work done to it, forged and balanced internals, drivetrain upgrades, etc.
Now, it's said to have about 285BHP, and I got a dyno map with the car showing the stock map and the "uprated" map, it has the ancient Greddy eManage Ultimate piggyback ECU for mapping purposes, considering the build cost of the engine I don't see why you WOULDN'T go with a standalone, but hey, it could be just me.
It works alright at the moment, but I'm having a bit of a problem, it stutters and pops a bit on high boost at WOT, at around 4-5k rpm, at anything more than 1bar.
I don't have a wideband AFR (yet, it's on it's way in the mail, so is a FPR), which is also sorta weird, but whatever. The plugs that were sat in it, well they were ancient, so I replaced them with a set of NGK BKR7E's, which helped a little, it didn't stutter as bad anymore, now with the new plugs if I turn the boost down to 0.8 it works fine, but it's not nearly as fun as 1.2, which is what it's supposed to run.
Things I've checked and done to overcome the issue: New fuel filter, checked inside the tank for debris and dirt (also found out it has a (probably) really old Walbro GSS341), all good, new plugs, and connected to the eManage just to check the maps and to see if maybe it would return any helpful or interesting data, but it didn't.
What I did find interesting was that there was no fuel map though, as far as I could tell, I imported the data from the eManage and there was no obvious fuel map, or any obvious changes really.
So I'm a bit sceptical about the given power numbers, but whatever. It's quick, when it doesn't stutter.
Any advice? Anyone know the longevity of Walbro's in-tank fuel pumps? I'm thinking it might be a fuelling issue, coil packs for these aren't really common in Norway, so I'm really hoping it isn't a spark issue.