Evo 8 spark plug gap should be set between (0.028-0.031mm) or (0.7-0.8in)
Evo 9 spark plug gap should be set between (0.020-0.024mm) or (0.5-0.6in)

These numbers are from the factory service manual.

 

Glad to see you found the problem! Mine did something similar when I first bought the car. (yet another previous owner that didn't know anything) I had several vacuum lines disconnected (including the ones for the turbo and boost controller) and the WRONG gap in the plugs.. BUTTT...even tho the factory manual does say 28 to 31, I had to set mine down to about 24 for it to stop with all the spark break. Keep that in mind if it comes back..you may just need to close the gap just a tiny bit. Be sure to also check your vacuum lines after doing a lot of aggressive driving, they like to jump off, even with new lines. A zip tie and hairspray can be very useful tools...spray a little on where the vacuum hose goes, and it should help them stay put. This also works for keeping intercooler couplers from popping off. Just FYI. Cheers

 

Sorry for changing thread questions, I need help! What turbo manifold flange is on the evo 7 japanese spec? T3 flange or? what turbo can i fit straight bolt on!?

 

I ran the NGK BPR7ES plugs, gapped to .025... It's running perfectly for now. I wouldn't be surprised if things start to come loose and pop off in there. She tried to drive it for the first time last night and she cannot seem to figure out the pucked clutch. She just drops the last little bit of the clutch and of course the car jerks and jumps, so I've been trying to teach her. Wish me luck! This car is so damn fast it isn't even funny, I don't think she's ready for it!

 

^ May want to make sure the clutch pedal is adjusted properly. It can make a big difference in driveability. Best of luck with the car. Have her check the tire alignment too (should be able to find a shop that'll check it for free).

l8r)

 

Isn't the Evo 7 the exact same? ...I think it is...so therefor buying one would be silly. IF it is the same, you can put any stock or "stock frame style" turbos on it. (MAPerformance, Forced Performance, ect)

 

Exact same thing.. Except for spring retainers (evo 8 come's with beehive springs), front end etc.. Lol but you can bolt any stock framed turbo up to it, since they have the same exhaust manifold & exhaust system.

 

Thanks, I was planning on getting a garrett turbo installed & wondering if it be a direct bolt on? How much horsepower can the jdm evo 7 motor handle & are they strong motors?

 

No it won't bolt straight on. It must be a stock frame turbo to bolt on.

 

Always gaped plugs to .026. On 150k mile OEM colis and never had a spark related issue. Also have always run copper plugs Running BR8ES's now

All is good

 

<p>Everyone's talking about what gap they are running on stock coils but who's putting horsepower number they are running on a .26-28 gap. If you are running stock sure read the manual and go from there.if you are running more power its a good idea to gap them closer to avoid blow out.the reason people pay 200-500 bucks for cop kirs is so they can run a more open gap.

 

VD has always shown 450hp-460hp consistently on a 35r variant.

About 26psi 93oct.

Car has been to 30psi with a 100oct splashed in. Again never a spark related issue to speak of. EVER


Sometimes it's all smoke and mirrors folks

Oh and its .026-.028 not .26-.28 (1/4 in plug gap LOL)

 

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<p>&lt;p&gt;smoke and mirrors? I was around 450 whp and getting consistent ignition issues when wot at 6000. Consistent. Issue was plug gap. Gapped my plugs to 0.18 on stock coils and ignition issue was cleared up. As you may have never had issues does not mean that plug gap is undisputedly an issue with too much gap when reputable vendors and performance shops as well as experienced members will agree. Lets try and not post up bad information here.

 

HUH

Don't know what to tell you man. Just giving my exp and many many other can confirm the same on here going back to 2003.

And you keep placing your decimal point in the wrong place BTW

.18 HAHAHA Yea you are sure to have issues there.

Why the hell would I tighten my plug gap I have never had an issue at .026? Got me? Guess I'm lucky not to have to tighten my gap down so far Woot Woot

As far as exp Members you're kidding right. I guess 8-9 yrs with this car doesn't account for much Are not too many bolts I haven't touched on an EVO at this point sir.

 

<p>.026-.028. Better? I'm not going to argue in regards to something as silly as plug gap. What I will say is that my ignition was busting up at 6000 rpms due to too much open gap I believe it was .023 on the stock coils. I'm glad you have not had issues at .026 again I never told you that you did have issues in fact, I said that because you have not had issues does not mean others can't. I guess you were too busy disecting my post for errors. Assuming you have an 8 since you have had your car for 9 years maybe you dont require as much gap. Personally I gapped mine to .020 with a cop. I'll probably try and open it to .023 next time I get plugs but for you to say it's smoke and mirrors when I have personally fixed my ignition issues happening with the plugs is a little misimformative.</p>