RB20 / RB25 coil swap idea

[lysdexia]

Cheap and easy way to go about it;

http://wiki.r31skylineclub.com/index...rsion_For_RB20

not so simple to adapt to a series 2 RB25, though it would still be possible.

[Mr Ed]

Can you use 2JZGTE ones? They never seem to fail no matter what is thrown at them.

They do fail but normally due to cracks in the plastic (years + heat = bad), they are known for not failing at high power levels but are by no means immune to the failure rates of old coils. Ive had several fail due to cracks.

The GAS motorsport guys run stock coils in their 6s drag cars, although they normally buy new coils from Toyota and back them up with a CDI.

[RB30-POWER]

from memory i paid around $1400 for a series 2 rb25 a fair few years ago, only had 40k on it, when i pulled it down to put on the 3l bottom end, the rb25 inside was like new and really rough hone marks to back up the low km.

i paid a few hundred to get the rockers and coil cover painted bayside blue, never ever put the coil cover on because i reckon if you leave it off the coils stay cooler and i didn't want the low km coil getting farked.

although some people say leave it on because the timing gears blow cool air through the timing back plate, no idea really, i just leave it off.

i sold the iridium plugs, stock ecu and afm for a few hundred, put standard copper plugs in for $12 or whatever, so it owed me even less.

[TT]

GTSBoy - you know full well that you can't break an RB20
Your dreams will never eventuate.

also, where does an RB25 from R34 sit in the engine of choice.

[2rismo]

also, where does an RB25 from R34 sit in the engine of choice.

In the 'spending money for the sake of it' category I'd imagine.

[GTSBoy]

From what I can gather because the Neo RB25 is a high comp unit it's very nice when near standard (ie makes a bit more torque) but is not as good for winding up the boost to make lots of power as the older RB25s.

That in itself might suit me. The car is just for driving around in - mostly to and from work. So silly power is not my goal. More torque definitely is worthwhile. Thing is I already have at least as much power now as a Neo25 and any engine upgrade would want to come with a reasonable increase in power in order to make me keep smiling.

+ the Neos are definitely asking more $$ anyway.

[Billzilla]

They do fail but normally due to cracks in the plastic (years + heat = bad), they are known for not failing at high power levels but are by no means immune to the failure rates of old coils. Ive had several fail due to cracks.

The GAS motorsport guys run stock coils in their 6s drag cars, although they normally buy new coils from Toyota and back them up with a CDI.

Okay, thanks for that now I know.

[GTSBoy]

Bill,
Sorry I didn't get around to your question - sidetracked before I'd even finished reading it.

I would also expect that the 2J ones might not mount the same way as the RB one. I've seen them and they're similar, but counting on all the dimensions to be the same would be too much to expect.


lysdexia,
I did think about using an external coilpack and leads, but only for about the 0.11 seconds required to write it off as an aesthetic failure and a step backward to the technology of a previous century.

[Billzilla]

Bill,
Sorry I didn't get around to your question - sidetracked before I'd even finished reading it.

I would also expect that the 2J ones might not mount the same way as the RB one. I've seen them and they're similar, but counting on all the dimensions to be the same would be too much to expect.

Yeah I didn't expect them to, but I don't care.

[Mr Ed]

Size wise the 2JZ ones would be easy to adapt to almost anything as they are very small. On a 2JZ they screw into a metal plate that bolts to the cam covers. It would be very easy to make a new plate with the bolt holes in a different spot.

But yeah...not much point for this application.

[R32Big_boy]

GTSBoy - you know full well that you can't break an RB20
Your dreams will never eventuate.

This man knows! Just feed the little mongrel a prodigious amount of boost and have fun!

My house mate who happens to be a minister of RB20 propaganda over on SAU has a TD06 20g sitting in the apartment. He is OS for another week so if you were to say, give me a couple of slabs of beer I'll tell him his turbo never arrived from japan....

[lysdexia]

i broke an RB20 once. TD06's and standard fuel systems don't get along very well.

that said, the one i replaced it with refused to die, even when a cam wheel bolt worked loose, split my timing belt in two, belted the fuck out of the teeth on the cam gears, destroyed the front main and dumped all my oil while i was on the limiter on a drift day. new belt and front main, and it still lives on today in a mates car!

as for the external coilpacks, +1 on it being an aesthetic failure, that;s one reason i haven't done it myself. i don't quite think it's a step back in terms of technology though, it's basically the exact same setup (albeit a 3 coil wasted spark setup) with the coils moved away from the heat of the engine..

[lysdexia]

/csh

[GTSBoy]

i don't quite think it's a step back in terms of technology though, it's basically the exact same setup (albeit a 3 coil wasted spark setup) with the coils moved away from the heat of the engine..

Anything with plug leads is a backward step in tech. Wasted spark is also somewhat of a backward step. Very backward in the case of the three cylinders where the spark fires in the opposite direction to what the spark plug designer intended!!

If I was going to go outboard coils, then I would probably actually use outboard coils. 6 of the Mercury ones or something. But there's nowhere sensible to mount anything like that in a standard Skyline engine bay. It will always make access to something/everything else much worse. Couldn't make a good argument for putting them near the passenger side tower as it's the hot side with the turbo (and all the shitful inlet plumbing and so on). The other side is crowded with brakes and fuseboxes/batteries etc. You'd have to be stripping the bay down for a race car in order to make a decent spot for them.

As it stands I think I will have to order some RB20 ones from Nengun (seems to be the best sort of price around atm) and just scrounge a 2nd handy for the time being until they arrive. It's hot outside, so it will start missing before I make it to the workshop this arvo, so I should be able to work out which one is not functioning.

[R31t]

I replaced the stock ones on my RB26 after the same problems your having. Got JJR ones just because they were cheaper than splitfires. No problems so far but that was only 12 montths ago.