i am going to rebuild and street port my engine. i have power fc, v mount intercooler, walbro pump, catback, downpipe, going to use 850cc x 4, and all ngk 9 spark plugs. looking for around 350whp and wondering if the hks ignition is really needed? or do the 9s all around spark plugs work?

my friend's fd only put out 325whp @14psi because of the lack of ignition. he is using stock 7s and 9s plugs.

 

Possible, but unlikely. Really depends on the health of your stock system.

 

I agree with Gordon, I don't think you will need one. A good way is when you get to your tuning session and you have any breakup up top then you may go ahead and invest. But I would replace plug wires and plugs before the tuning session just to rule out any of those little gremlins.

 

It won't hurt but you certainly shouldn't need it. I made 476 hp with new stock coils, wires and 10.5 heat range race plugs. If you are having ignition issues it is in one of the components or the tune.

 

needed probably not! but a quality ignition is always a plus even in a stock FD. when I added my hks twinpower I got faster starts, better throttle response, and better smog readings. so I would install it . it will only better your new upgrades.

Jeff

 

I had high rpm breakup as soon at I went above 13psi on the stock system with all the bolt-ons. (New 9s plugs, wires, on a 50k mile car). The HKS cured it immediately. Yes I could have bought new stock coils but since they cost significantly more than the HKS, this did not make sense. Also got slightly smoother throttle response and very slightly leaner AFRs after the install.

 

Glad to hear that fixed your problem, but it is sounding like you just band-aided a problem that you found. Sounds like one of your coils is not functioning up to par. I would at least think about replacing the coils if I were you.

 

Why would I spend several times the price of an HKS to fix a problem I no longer have?

An HKS is no more of a band aid than an anti-roll bar.

 

B/C I do not think that your coils are in great shape. With the stock twins and a mere 13psi I do not think you should be having breakup. But I guess it could possibly be your tune as well.

 

What does tuning have to do with breakup lol?

thewird

 

To be fair, it is possible to introduce hesitation by dumping way too much fuel, but that was not the problem in my case.

 

You probably had a weak coil. They can bench test ok but things can change once they are on the car and get hot.

 

I guess thats a possibility but that would possibly mean the ignition system was on borderline capable and an upgrade is recommended. An ignition system should be able to do mid 10's and not breakup (on gasoline).

thewird

 

My buddys putting down 345 on stock with same size injectors so no not needed.

 

moconnor, I was simply stating that I did not think you should have had any breakup with the information you had provided. Apparently, I stepped on your toes and that was not the intetion. The twin power can help smooth things out but if a completely healthy ignition system is present it should not be "needed" in your case or the OP's. Again, I apologize.

 

I apologize too - I was unnecessarily snarky.

 

On that subject of Twinpowers, I have a second hand one for sale with FD harness here in NZ and the way the exchange rate is it might be a good buy for you guys in the states.

PM me if anyones interested.

Sorry to spam

 

So there are some mixed feelings when it comes to using the hks twin spark for only 350whp. SHould i use all 9s spark plugs? should i upgrade to hks plugs?

 

i would run all 9's. It will add a little safety margin, and they don't seem to be any more likely to foul then the 7/9 combination. I personally like the NGK B9egv's. They require a thin wall socket, or a regular one turned down on a lathe. They are less expensive then the stock plugs, seem to foul less and have a better spark. I've also heard good things about the BR9eix's. The EGV's are non resistor and the EIX's are resistor type.

As far as the twin power goes, for only 350 hp you won't be running enough boost to get ignition break up on a healthy stock system. So the HKS twin power is not required to make the numbers you're after. On the other hand the there are other benefits to the twin power besides dealing with breakup issues. If you ever have a problem with the engine flooding a twin power will make a huge difference in getting that resolved, faster starts, and overall better performance, probably a bit better mileage as well. I think most everyone that has invested in one feels it was a good investment. I know I do.

 

No worries, I am not easily offended.

To the OP, I agree with dudemanownsanrx7. All 9's would be good. I do not know of too many ppl that run the hks plugs, NGK's work all too well. I run the stock 9's on all 4 and I don't have any issues but I also replace them often.