Got Over 400kw Atw?

[bigmikespec]

Wire in V88

[Room42]

I will post results here in a while. Nuff said for now.

[rob82]

the plug in vipec and links are non sequential batch fire. aka z18et spec..

the wire ins are the way to go. the fact you have to hack up a standard ecu case to fit them aswell is a pain..

the haltech is quite good as it has all the built in knock control and is a "plug and play".

rb25 has forged pistons and rods, n1 pump with crank collar and ross "power steering belt flinging" balancer.

Does the knock control on the haltech actually work?

[Mark-32]

Joined the 400kw club but Im chasing some answers to some issues we had along the way if anyone can help......??????

The car is a r32 gtst with rb26, dash 5's, vipec

This was the pulp tune

sharedmedia=gallery:images:83182]

Went to E85 so changed the injectors to id1000s and went for another tune.........

As you can see the car was suffering a fairly severe misfire at 4500 which after changing plugs 3 times, coil packs, cas etc had myself and the tuner completely stumped. The misfire seemed to be heat related as it got worse the hotter the engine got and even on lower boost the misfire was still there at the same revs.

The car runs a vipec plug in and after pulling our hair out for 5 hours on the dyno trying to diagnose the problem and out of pure desperation we put a haltech ecu in the car with a map from a gtr and the miss was gone.

Has anyone ever heard of this issue and have any ideas?

[Mark-32]

whoops that was the pulp dyno graph

[GTRNUR]

The car runs a vipec plug in and after pulling our hair out for 5 hours on the dyno trying to diagnose the problem and out of pure desperation we put a haltech ecu in the car with a map from a gtr and the miss was gone.

Has anyone ever heard of this issue and have any ideas?

Coil charge/dischage settings.. or dwell settings....

Over-driving the coils with too much current will run them too hot, and that can cause a miss.

The issue will then get worse with heat. The coils themselves handle the heat, but the ignitor module gets upset and will cause miss-fires.

I can't be 100% sure, but from memory a maximum charge time of 1.2ms and a min of 0.8ms worked well for me with a wolf, but I wasn't anywhere near that power level with the engine that I was experimenting with this. Sorry if this is useless information for the vipec. I've never played with one yet.

Other vipec tuned RB owners might be able to share their ignition value settings...

[Mark-32]

Went through all of that mate had vipec guys on the phone etc it was nothing to do with that at all.

Funny thing i didnt mention was when we went back through some old dyno graphs from months ago it seemed the car suffered the same sort of issue at the same revs but it was not noticable as a misfire until the power was increased with the e85.

Iam a big fan of the vipec and would really like to get it sorted because as you can see from the dyno graph once the misfire is fixed and more boost is added it should make alot more power

[TiTAN]

mine has a miss around those revs also, the miss is there on the dyno but its not there on the street.

have you tried driving it to see if the miss is still there?

[R31Nismoid]

It should also be noticeably more responsive - 20psi @ 4700rpm on E85 is bad.

So sort your issue and you'll come close to picking up 500rpm maybe more which is good

If you swapped ECU then it's clearly in the setup/settings of said ECU as opposed to mechanical like packs/loom etc.

[Mark-32]

It should also be noticeably more responsive - 20psi @ 4700rpm on E85 is bad.

So sort your issue and you'll come close to picking up 500rpm maybe more which is good

If you swapped ECU then it's clearly in the setup/settings of said ECU as opposed to mechanical like packs/loom etc.

Im not sure what you mean? The dyno runs were done in 5th gear. I cant drive the car the miss is always there and cuts in at exactly the same revs evrytime and its that bad it doesnt recover and continues throughout the rev range. It has to be the ecu itself as the miss was completely gone with the other ecu on a pulp 33gtr tune.??

Spent 5 hours on a dyno checking valve springs trying evrything possible, tried running it super rich super lean made no difference the miss was always there couldnt even do any power runs it wpuld just break down

[R31Nismoid]

I just meant that once you fix your issue, you'll get a good 500rpm in response, the fact you did it in 5th - even more if you do it properly in 4th (assuming it's a 5-speed)

It could even be a farked ECU, although not everyone has a spare of the same model to try out - just another thought given you swapped ECU's and the problem went away.

[Mark-32]

Any idea of what sort of a power increase do you think i should expect once i solve the issue spins to 8500prm and 25-26psi?

[R31Nismoid]

Given it looks like it's hitting 23psi now, probably not much more, maybe 15rwkw at the most really. Same as everyone else

However the real gains you are yet to realise all lie smack in the 4000-6000rpm range, you need to sort the issue(s) out. You are easily missing 40rwkw in that region due to your breakdown issues which in turn is hurting your boost curve massively and so on. It's all domino's when it comes to spark/ignition. Once it goes, everything else is affected.

Also, looking again @ the graph i highly doubt it was done in 5th. 8000rpm/5th is well over dyno dynamics speed limit/cut i would've thought.

[Mark-32]

it was done in 5th to try get more traction it was more consistant for trying to diagnose the missfire. We even tried going half throttle through to 6000rpm then 100% throttle after the missfire area of the rpm and it made it better. As soon as in was full throttle is would missfire exactly the same

[WHITER33GTS-T]

Should make 450 easy enough I would have though.

Did Brad do the tune...?

[Mark-32]

http://www.skylinesa...30/page__st__20

It even says there somewhere haltech may not do it while vipec will. Could this be my issue do you think and explain why the haltech fixed the issue?

Edited May 15, 2012 by Mark-32

[SS8_Gohan]

from both my R34's, i never noticed a huge 'response' increase with E85, sure a stack more midrange and what not, but you're not going to be spooling -5's at 4000rpm just because you've switched to E85. Can't say i've really seen that sort of difference either in other peoples results.

[R31Nismoid]

You'll pick-up usually 200rpm at least from most results I've seen? And 200rpm is better than nothing.

But... My entire point is based around the fact that once the issues are sorted, he will have 20psi a lot sooner than 5000rpm like it does now, it'll be at least 500rpm if not more.

[scotty nm35]

I think the response comes from playing with the timing as the turbo spools, not the e85. I didn't notice any difference either.

[Piggaz]

I think the response comes from playing with the timing as the turbo spools, not the e85. I didn't notice any difference either.

But it's the E85 which allows you to dial in more timing. Which came first, the chicken or the egg? .