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Location:
Adelaide
Registered:
June 2002
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Re: 1jz/2jz ignition systems
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Fri, 04 February 2005 19:54
 
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Chris, I would tend to think your stock ignition should be okay for a fair few ponies over stock. (how many though I dunno-a 1J expert will certainly know.)
Make sure you close your plug gaps right up (0.7-0.8mm has always been a good compromise I've found) and it should be able to cope with a fair bit of boost. Certainly, if you find the spark starts to get blown out even with the closed up gaps, go for a better spark setup. Given the (relatively) huge cost of ignition upgrades, they aren't generally a very good kW for $$ spent item. To really get the value out of them, you need to be able to wind the boost right up past where the stock system was wussing out.
Another way to go about it is to instead invest in some racing fuel (LMS, C16 etc) for the dyno and strip. Although it's expensive, you'll be able to leave the boost alone and crank up the timing instead. You won't need a bigger spark as the boost won't change, but the timing can be worth 15-30%+ more power and the cost for a tank of jungle juice (50:50 PULP/C16 or LMS) is a whole lot less than for new coils............
What about the Jacar Capacitive Discharge ignition kits? I've got a Crane Hi-6 CD system and PS-92 coil on the crown and it is capable of jumping over 60mm. Once I had it set up wrong, and when I bent down into the engine bay near the high tension lead it DISCHARGED INTO MY TOP LIP!!!!!!OOOOWWWWWWCCCHHHHH.
Something you may also be interested in is the research I've done lately into plugs. Currently I have some Champion Racing plugs with clipped electrodes and a recessed tips. They hide the spark just inside the end of the plug and also keep the plug a lot cooler so as to surpress detonation and allow you a bit more ignition advance over stock plugs. ($85 or so from Repco and they come in a type suitable for late model Toyota engines) I certainly found them to work well, with the only downside being a bit of fouling after extended idle-but you check them after every run at the strip anyway........
How is the project progressing? What sort of rear end does it have? Solid axle I guess, but does it have 3 or 4 control arms(in addition to the panhard rod)? My crown had 2 lower arms and a single, offset from centre, upper arm. I found that the offset single upper link tended to cause tramping with worn bushes, but that once I put an extra upper link in there that the problem was solved.
What diff are you planning to run?
Sean
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