MBS206

The advice I've been given by most engine builders is not to restrict the oil getting up top. It's all in freeing up getting it back down to the sump. IE, you REALLY want a good drain setup to get it out of the head. Then, you're all sweet. The issue is only at high RPM, so who knows what it's doing when you're blocking an oil feed off and sticking to low RPMs. You might be starving the head of oil slightly.

Do a compression test, but put some oil down the bore of each piston just before you go to test it. If compression comes up higher then it was when dry, you have a dud piston/ring. If it stays low, valves/head is dud. Test each dry, then test "wet" (Oiled) This will pin point obttom end or head in comp issues. Did you have the head serviced or crack and pressure tested when you had it off?

Guilt Toy, can you post up some info on how you tune your car, like target AFRs, some advise on timing advance etc. I'll be tuning my skyline in the new year (25/30 with an alright sized turbo) and want to know how lean you take them on cruise (Say sitting on 100km/h in 5th etc) and what sort of timing you have dialled in.

PM Performance_Wise on these forums... He needs someone to do some testing of coil packs and it might help you out largely...

I'd be putting a brand new map in the car like suggested above and retune it...

Sorry, forgot that I'd read that already re comp test. As with the cas, generally the teeth being worn rears its head as a miss fire when ever you're cruising at a constant speed, or backed off... Wondering, it does it at the same revs in EVERY gear? Can you try disconnecting your knock sensors as well? I'm wondering if they're picking up noise from valve train at those revs... (This will only affect if your ECU actually does something if it detects knock)

When you check the car again. Pull the CAS off, and have a look down inside it at the little "teeth" that mesh it to the cam. See if they're worn, and allowing swap. Compression tested it?

Pics of whole car? Price, whole car?

I'd be going after either HICAS, or bushes, or find out which parts HAVEN"T been replaced...

Looks after market. One of the wires has an inline fuse in it... Trace the other two wires, see where they lead. I'm wondering if they go upto the ignition (one is likely an earth) I'm thinking it might be a turbo timer loom...

Once the car is warmed up, as you bring the revs up, does it slowly lean out, and then start miss firing in that range? Or does it get really rich and then start miss firing? I'm wondering if there's an issue in the tune. When did it start to occur, and what was the last thing you did to the car BEFORE it started misbehaving, and how long before it started miss behaving did you do it? I also looked at this thread, but don't think it'll help you http://www.skylinesaustralia.com/forums/Rb...rk-t215013.html

Flux capacitor... Bugger paying $550 for a new RB25 AFM when you can get the Z32 + loom plugs for like $200 - $300 if you look around. Then grab something like a PFC, or SAFC, and get it tuned. Then, it's all setup for future upgrades. Definitely sounds like a sus sensor though, whether it be AFM or not. Could be a bad TPS or CAS sensor or knock sensor also.

If the car miss fires, it will show lean. No matter really. If plugs foul. It miss fires. Excessive oxy left. If boost blows out spark. Miss fires, excessive oxy left. Ignition system fails. Miss fires. Excessive oxy left. No matter what, a miss fire will register lean. There WILL be excessive oxygen left.

I run a cat, brand new one actually, and still get the yellow stain...

When did you put the VN V6 coils in? These are known for failing, even new coils. Are you able to get the ECU to run on the factory ignitor with splitfire coil packs?

Mate, I don't live any where near my mummy to run to... Also, the comment was because not only you, but about 50 other threads in the last 2 weeks have had other people saying it. I'm not playing the victim, I'm laughing at the fact so many people are missing common sense around here. Hell, someone else even said they were going to say the same thing as what I did. So HTFU, and move on with life mate, instead of turning into a keyboard warrior attempting to be the toughest little shit out there. Edit: loving how you also have to keep relying on personal insults. Have nothing else to be able to say except "you're this", "you're that" and "I'm smarter then you as you're just a dumb arse"? Nothing constructive? No counter technical argument? If not, have a nice day and stop spamming this guy's thread.

PS, I don't believe you... And you're the one getting all worked up, after someone said to check something, which you said not to, because you had the same problem, and then I said again, that he should check it, because you've already had the problem... Do you see where I'm going with your half witted level of thinking. Any way, I'm not going to argue with you any more. You're obviously a moron, and I'm not going to let you drag me down to your level, you'll just beat me with experience... Have a good day.

Mate, just because yours didn't go swimming in water through all 6, doesn't mean his couldn't have. You're a fool, there's no where for the water to drain to once it's in there, other then once it fills up, and flowing in to the other coil pack areas. And maybe I should "shut my farkn mouth", but have you thought about learning to 'speel' or use the English language appropriately? You sir, are a fool, and a keyboard warrior. I have provided more input then what you have, especially with your "It can't be the problem you just said because I had the exact same problem just not as severe" (PS, have you cottoned on to that part yet?)

I bought, and already paid for.

Dropping another RB20 in, VS picking up an RB25... Will be a bit more for the RB25, BUT you'll see MAJOR amounts more torque. Much better engine all around.

If you already have the manifold, you WILL need to find out what flange is on the manifold, and then buy a turbo that uses that flange.

Don't count. Line the exhaust cam gear up on its mark. Line the inlet cam gear up on its mark. Line the crank up on its mark. Put timing belt on. Turn crank over twice. Check marks. If all marks still line up where they were originally, well done, job complete. If they do not. Take timing belt off re align everything to their marks, start again putting belt on until after two turns of the crank, all of the timing marks line up. This is the proper way to do them.

You'll see a much better gain by bolting up the whole RB25. What is said above is correct also, water galleries do not line up. The RB20 head flows no where near as much as the RB25 head. So it would be a huge backward step to do to the RB25 bottom end. Considering you can grab a cheap RB25DET and drop the whole thing in, and your old turbo setup etc will bolt to it (If you're using a stock turbo, use the RB25DET turbo!)

Remove the boost controller completely and test. Does boost hold stable? Is the waste gate flap hitting the dump?

So you're using a Serial RS232 to USB convertor? Is the driver for the converter installed? Which model converter are you using? Have you googled to see if it's a common problem using that ECU with that converter?