Spark plugs spec

[Loofee95SE]

What do u guy used on ur CA.I'm swaping my turbo (again) this time i'm putting in a T28 BB from late S14.w/ FMIC, I was thinking to up boost to 10psi over stock 7.5. what is the ideal gap for the plugs??for fuel i got 460cc from FC Rx7, and Apex-i S-afc. everything else is stock.and timing set @ stock 15 BTDC. C

[r34 gtr]

i would leave the gap the same.. maybe go with a step colder plugs. im not too good with these things though, ill bet dee, ryan or well, just about anyone can give you a better answer. at least i tried...

- tim

[float_6969]

Pretty much what Tim said, though, I'm not even sure I'd bother with a colder plug. If you do go colder, don't go more than one step colder, and I really wouldn't worry about the gap.

[r34 gtr]

awesome! i got something right!

and when i said a colder plug, i only meant one step. thought that was kinda a given.. oh well.

- tim

[float_6969]

It's OK Tim, you're doing good. I'll give you a cookie later....

[r34 gtr]

yay!

on a side note, this thread just got 0wn3d!!

- tim

[iliketocrash]

speaking of plugs... what happens if the plugs are too "cold" for a particular application?

[r34 gtr]

youll run like a sack of manure! (too rich).

- tim

[WeldingHank]

i have one step colder iridium's in my mostly stock CA. i like them alot. they come gapped .032. can't comlain.

[Loofee95SE]

so plugs gap should stay the same...cool then..what is going on Tim?? how's ur car coming??

[iliketocrash]

well so then what plugs should i run? i coulda sworn somewhere that the plugs for the nissan pulsar (exhaust side) that crossover to our engine are a step too cold or something. Is this true? I'm running really quite rich but my ecu doesn't say there's anything wrong with the car. I am running 450s though.. but i really don't think that the 450s alone would make my car run anywhere near as rich as it is.

[RMiller]

Well, you'll run 22% richer with 450s, 24% with 460s. I think that's enough to make you run really rich. But you have an SAFC, you can correct for that, just make it like -24% or whatever. I use 450s and T28 with a ROM chip and I use NGK BCPR7ES-11 plugs. You can buy them at sparkplugs.com. I left the gap at 1.1mm. I'm happy with them, I guess, but then again I'd be really pissed if my car ran crappy because of the plugs. I used these plugs because they were recommended on another thread.

[Loofee95SE]

1.1 mm gap that is very wide!!!, how the T28 and those injectors doing for ya?? big improvment over stock?? I'm feeling that my car is slow again...and need something to make me feel that edge again.. I got the 460cc sitting here waitting for me to decide about the turbo....-_-"" so T28 is coming very very soon. C

[RMiller]

If you get a T28, don't get the GTiR one. That's the one I have, and the big a/r on the hotside (0.86) causes some slow spool. I see about .1 bar at 2500, .2 at 3000, then .4 at 4000. Hopefully I'll see 1 bar at 4000 when I up the boost, but who knows. Injectors work great, they're from a 1g DSM. I have a z32 maf too, fmic, 3" turbo-back, intake, rom tune and the car feels like about 14.0 in the 1/4. I figure I'm putting down about 190 to the wheels. Hopefully the boost increase will give me like 80 whp, because I expected this car to haul. Is the 1.1mm gap too big? Do you think I'll notice a difference if I close the gap to 1mm? Should I close it narrower than 1mm?

[RMiller]

Hey I regapped my plugs to 1mm and I swear the engine runs much better. My engine used to vibrate like crazy when starting from a stop if the rpms were below 3k, now I can start like normal people do. The car also feels much faster. I guess too small a gap and you risk detonation, too large you get poorer performance, bad mileage, fouling of plugs.

Thanks, Loofee, for bringing the gap to my attention.

[biosehnsucht]

[iliketocrash]

i'm just trying to figure out what's going on with my car. the ecu isn't throwing any codes but my car is just flat out slow. i know its running rich but i dunno.

[paul_s13]

I was running BCR8's at a .8mm gap, any bigger and it would misfire under full boost (21psi with a T34 hybrid) Anyone with power over 280bhp should run 8's, I spoke to NGK and they say go one step colder per extra 70bhp over stock.

[Loofee95SE]

With all those upgrde u have u only make 10HP over stock?? or u talking about @ the wheel?? with ur spec..i was thinking somewhere in the line of 250 Rwhp.but yeah, I'm looking for late S14 or S15 T28 not the GtiR. PUAL-S13 what will be the next colder plugs over the CA stockies?? Brand?? just getting more info for my car... BTW does anybody knows if the Spilt fires coil for the SR aplication works on our beloved CA, if it doesn't ,what do we have?? to upgrade our coils. C

[float_6969]

SR coils are different, but RB ones are the same. I KNOW somebody in japan has to make upgraded coils for the RB but good luck getting them....

[paul_s13]

PUAL-S13 what will be the next colder plugs over the CA stockies?? Brand?? just getting more info for my car... BTW does anybody knows if the Spilt fires coil for the SR aplication works on our beloved CA, if it doesn't ,what do we have?? to upgrade our coils. C

I would change the plugs if you have done any power upgrades. so first step is BCPR7ES-11, the standard 6's are too hot.

[RMiller]

With all those upgrde u have u only make 10HP over stock?? or u talking about @ the wheel?? with ur spec..i was thinking somewhere in the line of 250 Rwhp.but yeah, I'm looking for late S14 or S15 T28 not the GtiR. PUAL-S13 what will be the next colder plugs over the CA stockies?? Brand?? just getting more info for my car... BTW does anybody knows if the Spilt fires coil for the SR aplication works on our beloved CA, if it doesn't ,what do we have?? to upgrade our coils. C

I am talking 190 hp at the wheels. I'm just guessing conservatively based on seat of the pants, and comparing it to other cars I do know the hp figures for. Remember I don't yet have a boost controller; my boost gauge reads about .4 kg/m^2, or about 6 psi. I don't expect to get more than 300 whp with this turbo, but I do think I can get 270 whp just by upping the boost. Yeah, I wish I'd get 250 whp at stock boost.

[paul_s13]

All my figures are at the fly bhp, I've said before that I just don't believe that you can get some of the figures that are quoted here with the boost that is used, I have NEVER seen a CA get more than 240-250 @ the fly (210-220 rwhp) with a T25 hybrid or not.

I have seen loads of CA'a in my time, and mapped a few too!

I find the who SAE and DIN power figure conversions a bit confusing!

[RMiller]

I don't think anyone should get 8's with a T28. You've got a t3/4 at 21 psi, so it makes sense to use 8's. You must put down 400 bhp, so by NGK's recommendation you should be using 9's. I say keep the 6's with stock turbo, use 7's with sr t25 or t28, consider 8's with t3/t04.

[cortina-mk1]

i havent seen anyone on this forum quote flywheel figures generated from some 'figure'the norm here is always 'at the wheels' unless on a engine dyno

i never will understand why this is done ... or why introduce inaccurate figure when you have an accurate one .....

[paul_s13]

i havent seen anyone on this forum quote flywheel figures generated from some 'figure'the norm here is always 'at the wheels' unless on a engine dyno

i never will understand why this is done ... or why introduce inaccurate figure when you have an accurate one .....

I don't have a problem with what figures people quote flywheel or wheel figures, but its the quotes of 300rwhp with tiny turbos that i just don't get, the most ive seen with a stock T28 (with cams/ported head/ DTA management etc etc) was 260bhp @ the wheels.

Most CA boxes loose between 30-45bhp through the gearbox, so 300rwhp means nearly 340-350bhp and some of these quotes have been on cars that have the standard header that tops out around 290-ish rwhp (330@ the fly)

Oh And I've killed a standard '6 plug with the standard turbo, 7's dont effect the idle and they don't coke up either.

[RMiller]

300whp has been done lots w/ an sr20 and t28, I don't see why a figure near there wouldn't be entirely possible with a ca18 and t28.

[paul_s13]

Its the

300whp has been done lots w/ an sr20 and t28, I don't see why a figure near there wouldn't be entirely possible with a ca18 and t28.

Its the DIN and SAE differences IMHO that for me casts doubt on figures, thats just my opinion and its not meant to upset anyone in anyway.

[cortina-mk1]

i did get 280 rear wheel horsepowerwith stock cams, gt28 but it had a ported head and different exhaust manifold and autronic engine managment.this was all on a dyno dynamics 'australian' rolling road dyno i can understand what you mean.. some ppl may be 'reluctant' to let everyone know what they are using...

[RMiller]

Most Australian dynos are way conservative on the figures, so 280whp sounds great. I'm talking about whatever power figure people use when they say: "stock maf is good for 250whp," etc. My turbo can push 33 lbs/min, so I think the turbo can push 320 whp worth or air. I have stock head, stock exh. manifold, enough fuel and z32 maf. I'll dyno my car when I get a chance and some money, so realistically in a month, then I'll share the figures with you guys.