Modifications - Performance Discuss aftermarket and DIY performance modifications

Doing coil on cap mod...

Old 06-24-2014, 04:42 AM
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Doing coil on cap mod...

Im doing the coil on cap mod and fitting iridium plugs. Got some 07 CBR600 coils coming.

Soo, will I get more HP? Will I feel a difference at all?

I do have a small low rev miss which I think is a slightly rich mixture fouling the plugs. As soon as its up on the needles its fine.
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Old 06-24-2014, 04:55 AM
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Iridium plugs aren't as good as copper plugs as far as strength of the spark actually. They do however last much longer, that's their advantage.
Generally, if you have a more powerful spark, you want to increase your gap slightly on the plugs to take advantage of the spark.
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Old 06-24-2014, 05:14 AM
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Ive read on here they run much better on Iridium plugs.
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Old 06-24-2014, 05:19 AM
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Originally Posted by NZSpokes View Post
Ive read on here they run much better on Iridium plugs.
I don't think anyone was able to actually measure the spark plugs accurately. But the coil conversion was tested on a dyno by a few here and seems to increase couple HP more.

Cheers mate
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Old 06-24-2014, 11:07 AM
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i dont think the coil mod is for increasing HP. i could be wrong but i believe its sole purpose is to update to a more modern type of coil. basically just preventing the older type stock coils from failing at some point. similar to a mosfet R/R swap. no performance advantage, just updating the Hawks technology to prevent future failures. like i said i could be wrong but i dont think it does anything to increase HP or performance.
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Old 06-24-2014, 03:44 PM
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Originally Posted by jscobey View Post
i dont think the coil mod is for increasing HP. i could be wrong but i believe its sole purpose is to update to a more modern type of coil. basically just preventing the older type stock coils from failing at some point. similar to a mosfet R/R swap. no performance advantage, just updating the Hawks technology to prevent future failures. like i said i could be wrong but i dont think it does anything to increase HP or performance.
THIS ^^^^

No increase in anything unless you had issues before the swap.
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Old 06-24-2014, 04:19 PM
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I thought there was objective evidence (Dyno testing) showing ~2 hp gain before and after the coil mod on a good running bike. Tested stock-coils-stock again for confirmation.
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Old 06-24-2014, 04:31 PM
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Mass centralized. I will go faster.
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Old 06-24-2014, 04:41 PM
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Originally Posted by wannabridin View Post
I thought there was objective evidence (Dyno testing) showing ~2 hp gain before and after the coil mod on a good running bike. Tested stock-coils-stock again for confirmation.
Please post the dyno graph, from the same bike, on the same dyno, done the same day, with the same operator and the only change was OEM coils vs coil on cap.
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Old 06-24-2014, 04:52 PM
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like Erik said, there may be gains if the OEM coils were already suffering. if they are both working properly then how could there be any gains? they are both just providing voltage to create the spark. the stick coils just being a more reliable source for said spark....
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Old 06-24-2014, 05:12 PM
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Spokes, this mod is for reliability. If you want a big performance boost........do the throttle mod!
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Old 06-24-2014, 05:28 PM
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Originally Posted by smokinjoe73 View Post
Spokes, this mod is for reliability. If you want a big performance boost........do the throttle mod!
words of wisdom
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Old 06-24-2014, 06:10 PM
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Originally Posted by smokinjoe73 View Post
Spokes, this mod is for reliability. If you want a big performance boost........do the throttle mod!
Thats sooo last week.

I did it last week.
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Old 06-24-2014, 06:12 PM
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Originally Posted by jscobey View Post
like Erik said, there may be gains if the OEM coils were already suffering. if they are both working properly then how could there be any gains? they are both just providing voltage to create the spark. the stick coils just being a more reliable source for said spark....
I'm replacing 98 coils with 07 ones. Got to be better.
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Old 06-24-2014, 06:55 PM
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Thats sooo last week.

I did it last week.

And I am sure your life is all the richer for that experience. Like the laugh-o-lympics right?
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Old 06-24-2014, 08:02 PM
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You guys crack me up
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Old 06-24-2014, 08:39 PM
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Originally Posted by wannabridin View Post
I thought there was objective evidence (Dyno testing) showing ~2 hp gain before and after the coil mod on a good running bike. Tested stock-coils-stock again for confirmation.
Yes, there was someone (I believe it was Tweety on the UK vtr1000.org site. A search will confirm) who dyno'd thier stock coils and then tested the more modern Coil On Plug (COP mod) a.k.a. Stick Coils, back to back to back. There was actually a 2hp difference. Why? I am 99% positive it was because his stock coils were the originals from 1998 with a crap load of miles/use on them.

A lot of people, myself included, do this mod, because thier stock coils are old and instead of buying new stock coils, why not upgrade? Less weight (however little), less parts, less wires. And if you do it right, you buy a set of four coils with harness off eBay, sell the other two coils on here and the mod will be almost free.

Last edited by CruxGNZ; 09-30-2014 at 11:19 AM. Reason: spelling
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Old 06-24-2014, 09:07 PM
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I'm going to do this mod and use all four stick coils for a 4hp gain. Can't believe no one's thought of this before.
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Old 06-24-2014, 09:12 PM
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Originally Posted by VTR1000F View Post
I'm going to do this mod and use all four stick coils for a 4hp gain. Can't believe no one's thought of this before.
why not just do a dual spark plug set up, and 8 stick coils. were talkin serious ponies
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Old 06-24-2014, 09:14 PM
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Originally Posted by CruxGNZ View Post
Yes, there was someone (I believe it was Tweety on the UK vtr1000.org site. A search will confirm) who dyno'd thier stock coils and then tested the more modern Coil On Plug (COP mod) a.k.a. Stick Coils, back to back to back. There was actually a 2hp difference. Why? I am 99% positive it was because his stock coils were the originals from 1998 with a crap load of miles/use on them.
this is what i was talking about, glad to know more details.
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Old 06-24-2014, 10:34 PM
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Why bother with this when you can mount up two butane torches in the plug sockets and run 116 Sunoco racing fuel?
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Old 06-24-2014, 11:01 PM
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Didn't Tweety got couple more HP's from that mod?
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Old 06-24-2014, 11:42 PM
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Originally Posted by smokinjoe73 View Post
Thats sooo last week.

I did it last week.

And I am sure your life is all the richer for that experience. Like the laugh-o-lympics right?
To be fair I was unsure how it would work for me as I have a tremor. But its great, feel I have more control. I would never go back.
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Old 06-24-2014, 11:47 PM
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Originally Posted by smokinjoe73 View Post
Spokes, this mod is for reliability.
I do realize this. And the real reason Is I have a small miss and it cuts out in the rain. Extra hp would be nice. I dont know how old the plugs are either. So new plugs and much newer coils will help her run a little better.
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Old 06-25-2014, 05:35 AM
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You won't get any more power if you don't increase gap with a stronger spark. Coil on reduces the resistance in the line. That's the advantage. V=IR. When your V is 50,000 Volts, your I goes up quite quickly even when you only dropped resistance by 0.01 Ohms. If you are doing the coil on mod, increase plug gap slightly. Maybe 5-10%.
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Old 06-26-2014, 08:55 PM
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Have done this now. Very easy mod. All went to plan. Bike fires up and idles much better. Will be next week before I can ride it sadly.

I noted that the rear plug is showing to be a lot richer than the front. Will drop 1/4 turn on the rear fuel screw.

Plugs I took out look very old and worn. They are DPR9EVX. I wonder if they are the original plugs.

Overall very happy.
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Old 06-26-2014, 10:13 PM
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ok so i have to pull my finger out and do this next week

Spokes did you also re-use the shroud around the coil leads on you coil caps??? or can water/dirt now gather in the hole where the spark plug goes.
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Old 06-26-2014, 10:20 PM
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Originally Posted by sjscicluna View Post
ok so i have to pull my finger out and do this next week

Spokes did you also re-use the shroud around the coil leads on you coil caps??? or can water/dirt now gather in the hole where the spark plug goes.
I tried and broke the old cap. So at this stage wrapped an old bicycle tube round it. It very tight so cant see much getting in.
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Old 06-26-2014, 10:30 PM
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cool any photos :P if not all good
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Old 06-28-2014, 01:35 AM
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Originally Posted by sjscicluna View Post
cool any photos :P if not all good
Cool, will try to tomorrow. Thankfully my mechanic skills are far better than my photographic skills.
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