Lithium

IS THAT ALL ITS GOT? My bad, I must have confused it... man its coils aren't a virgin anymore Thanks again for that, man - quite a weight off my mind though still have to find out exactly what part is causing it if I'm to not spend $1k on splitfires or whatever they are Thanks everyone for the input given while sorting this out

Nice work, is it S362 or bigger? Going by that dyno power and trap speed I am guessing it was tuned on a hub dyno or something?

I'm going to try a different ignitor first, I have tried other sets of VN coils and it made no difference to the problem so not sure that its the actual coils.

To help with the investigation, I swapped out the wasted spark setup for a stock COP setup from a 100,000km+ S2 R33 and went out for a general cruise - it didn't skip a beat. We're going to try a pretty much unused Link 3-channel ignitor in the wasted spark setup and see what happens there, if it still plays up I have a good mint to just get a set of Splitfire coils and be done with it.

So when is this bad boy going to hit the strip? And on that topic, why on earth has GAS2JZ not hit the 1/4 mile either? That would be fricken cool to see

Agreed with all other comments, there are threads for Africa on whats needed to reliably get around that power. A GT-RS will do 250+kw but is working quite hard to do so, the GT3071R (if just cracking 250kw is all you need) or GT3076R path (for cracking 300kw) would be the way to go. There isn't such a thing as a GT3564R that I am aware of, a lot of people have been understandably mistaken into thinking the second two digits represents the turbine a/r (ie, 82R = .82a/r) but it actually represents in most cases the compressor wheel exducer size. A GT3582R with a .63a/r turbine housing would also be a viable option but the GT3076R with a .82a/r will do the same with possibly slightly more response down low.

Can you guys confirm that you downloaded the map from the ECU and found that everything looked completely normal, not to mention everything adding up on the wideband when road testing it when it was playing up?? I would have thought that if the data pulled off the ECU is correct, then the data IN the ECU should be?

Gah I do actually have a suppressor in there, oh well back to the drawing board

Thats quite interesting, thanks I would have thought that kind of thing would show up when we downloaded the MAP and also datalogged using the PCLink software? Its been brought to my attention that Link recommend using a 2uF noise suppressor between the coil pack's positive feed and earth with a wasted spark setup, which I do not have. I'm not sure if that could possibly explain some of the issue, or if it would be just to eliminate general noise from the system?

Yeah its the same revs in every gear. The ECU doesn't do anything if knock occurs, its not that clever unfortunately

The car never made it to Oz obviously, but it finally did some shake downs with its new engine/suspension/wheel & tyre changes last weekend and was straight back in the 7s with plenty more in it by the sounds:

Cheers, will look into that though I would have thought if the CAS was playing up it would be in the entire rev range? Was listed in the initial post that it did +/- 5 across all six...

Cheers A comment in that thread stands out and refers to something we'd planned to try in the next couple of days - which is checking or "improving" the earths - haven't ruled out that there might be a dodge or insufficient one somewhere and the more I think about it the more I could imagine this problem coming from one. I should have elaborated when I said we went out and checked the mixtures... the tune was one of the top suspects despite the fact the car had been driving fine on that tune for over a year, so we went out with the wideband to watch such things. The airfuel ratios are all normal everywhere until the misfire event happens, there is no gradual leaning out or going silly rich - it just suddenly misfires. The map also looks completely sensible, if you view the 3d representation of the map there are no stand out holes in the map which don't follow the normal "terrain" which would indicate there could be a trouble area. The problem basically came out of nowhere. It had been driving fine for a while with no changes to the car before it developed. Going to also replace the fuel filter and then this weekend hopefully try some factory R33 coils/ignitors and see what that does, my faith in the wasted spark ignition setup is waning as I've had other misfire related issues with it too.

Yeah thats what I thought too, I was just wondering if Adriano knew something I didn't - have been a learning n00b with these things long enough to know that no matter how much you think you know you know that suddenly a whole new thing can show up and prove you don't really know exactly whats going on it there haha

Cheers Adriano, the car is an hour away from where I am so I have to wait till I have a chance to get to it to try it out though I can't believe I hadn't tried that so far. The O2 sensor registered lean spikes when it happened, though if it was fuel related it would also show lean spikes- if not caused by a lean miss aye?

I don't have a scope I can unfortunately, though the Ignition module has 3 LEDs - one for each channel, and lights up each time it gets a signal.... will have to try it out and see what happens. Stupidly enough I haven't tried to free rev it and specifically pay attention though conceivable it may rev through so quick its not noticeable. I actually tried racing it a couple of weekends ago at the drags, and I tried launching at around 6000rpm and don't recall it fluffing until the tyres hooked then the revs dropped to the evil area then got all shitty.

Thats the spirit, none of this girly stuff... its a mans world, going clubbing doesn't mean dressing like a homo and shaking your tush to synthesised drum beats, alpha male shouldn't be the best dressed most cultured and well to do - its all about bigger, harder, faster, more! Whoa betide us if being bigger wasn't being better, imagine if it wasn't that way - if when journos were overwhelmed by the Skyline GTRs domination they labelled it "Skink" or perhaps "Newt"? But thank god they and we know the truth - that the man who has the most boost, the most CCs, the most PSI, the greatest hp/litre - will get dyno sheets to which all will bow, no meal will escape him and more females will be dragged to his cave than any other. Amen, Brother DirtGarage.

Cheers man, might have to hit you up on that PS, I have known for ages you were you... if nothing else the diving whale and fascination with VTEC gave it away

Time to make it 3litres+?

Put the VN coils in about a year ago, and tried another set this weekend just passed. I have a Series 2, there is no factory ignitor and I'm hesitant to spent ~$1kNZ to buy a set of coils when it may not even be a weak spark issue. I am however hoping to borrow a set of coils and an ignitor(s) to see what happens then.

We went one better and replaced the leads and plugs and no change. I haven't gapped the plugs further down as I believe replacing the plugs, and the fact that the missfire is not load dependant suggests to me the plugs are completely innocent. There is no ignition break down under full power above 4000rpm, which is where the plugs have to work the hardest to jump the gap - yet at 2500rpm at minimal throttle it misses. It makes the whole thing that little bit more confounding.

Hi all, I am fully running out of ideas for a very annoying ongoing issue I have with my Skyline. The symptoms are that it has a serious misfire/hesitation which only rears its head when the car has been warmed up and driven for a while, and is mainly in effect between 2500-3500rpm at any load level - straight cruise or at full load. The car will cruise fine at 2000rpm, or at 4000rpm+ (even wide open throttle above 4krpm is perfectly fine) - but in between gets very iffy. Does anyone have any ideas on what it could be? Information on the setup: - R33 GTS25t with the original RB25DET, compression test a couple months or so ago gave +/- 5psi across all 6 - Runs a upgraded (Garrett GT3076R) turbo on 1bar of boost - Running a GTS Link plugin ECU (MAP sensor, no AFM) - Has stock inlet and exhaust manifolds - Has been dyno tuned, and on the road aside from when the miss happens mixtures seem sensible - though the uncombusted air I assume would be responsible for the lean spike on the LM2 when it happens - Runs a wasted spark ignition system using GM/Holden Commodore VN V6 coils and a Link 3channel ignition amplifier with NGK "BCP" heat range 6 plugs gapped to .8mm Things we have tried to diagnose this issue so far: - Changed Spark plugs - Changed coil packs - Changed ignition leads - Changed exhaust manifold - Done a road test with wideband to check mixtures All of the above things resulted in no change whatsoever. Thats all I can think of that might paint a picture of whats going on, any input would be greatly appreciated - feel free to ask any further questions... I am at a wits end with this now, its unlike anything I've seen before and makes the car very hard to enjoy. Cheers, Dan.

Good to hear its back and working, and don't get put off working on your own car - just make sure you know exactly what is involved when you set out on doing something with the car. There are plenty of FAQs around here and elsewhere on what to do just in case you may not have thought of everything

They are both good turbos, there is no better out of the two - there might be one which is more suited to what you want but nothing in your question suggests what that would be. A GT3037S (GT3076R in Garrett speak) is very very similar to a GT3071R, everything on the turbine side is identical - the 76R just has a bigger compressor wheel and compressor housing (which also has antisurge ports). The GT3076R will make an extra maybe 50 or so hp but with that comes a little more lag.

Although from what you are describing the tuner is quite possibly to blame for your problems, for informations sake I am running a now phased out base model version of the plug in Link (GTSLink) and my car runs really well with it - the new G4 series links are very very good, there are a lot of "high end" track/drift/drag and street cars in NZ running them already and tuners/owners alike sound very happy with them so far.