98_SI_Coupe

Ok everyone...I just installed a header on my 1998 coupe....so I have header/exhaust/intake. Im getting a high flow cat next....but then what? Its D series by the way.

zeeman

iTrader: (1)

then maybe an aftermarket intake manifold.
Don't waste your money on an adjustable fuel pressure regulator or any of that MSD crap.
How's the clutch? Maybe get a better clutch and a lightened flywheel.
Or a cam and adjustable cam gear, possibly some valve springs and titanium retainers. All depends on your budget.

chris_si98

upgrade your ignition. Most bolt-ons do very little on d-series engines.

98_SI_Coupe

well, after my high flow cat...I was gonna get AEM cam gear and AEM pully kit...hows that?

zeeman

iTrader: (1)

don't waste your money on a pulley kit or ignition mods. Unless you plan on using n20 in the future b/c you need an ignition cut available on MSD's and stuff....but otherwise its useless, honda's ignition systems are good for any sort of n/a application and even lightly boosted ones.

chris_si98

listen to him. He knows way more than me.

I thought ignition upgrades would be a decent investment, but I suppose yours is fine? Thanks for clarifying that zeeman.

98_SI_Coupe

so your saying just get an aftermaket intake manifold? Is OBX good?

98_SI_Coupe

Also, Im not too good w/engine tech and all that so can u guys clarify what are valve springs and titanium retainers and cam...and what exactly do they do?

zeeman

iTrader: (1)

well the camshaft is what essentially controls the opening and closing of the intake and exhaust valves (which let air into and out of the engine).
A valve spring is what snaps the valve shut tight after it opens. And the retainer is what holds the spring in its place. Aftermarket camshafts usually require the use of aftermarket valve springs and titanium retianers, well anything more that just a stage 1 that is.
Well honestly, i think i would upgrade the clutch next and get a lightened flywheel while you are at it.

imported_loudsubz

how much boost would you say stock ignition is good for zee

98_SI_Coupe

So If I decided to do those next three mods, I would have to do them all at once?(retainer, valvespring, camshaft)

bbarbulo

iTrader: (2)

stock honda ignition can easily support 300 WHP.

beyond that... well I know two guys running individual coil packs.

imported_loudsubz

thanks B good to know, one thing off my list

bbarbulo

iTrader: (2)

I run OEM everything except for plugs. For plugs, I use NGK BKR7E. Beyond that, I would go for inividual coil packs as well, they have been tested at over 1000 hp.

imported_loudsubz

link to individual coil packs?

zeeman

iTrader: (1)

well boost is different, an aftermarket ignition system with boost timing retard is a good idea, especially if no sort of engine management is used (like on most budget turbo set up).
I agree with bruno stock is good for 300whp, but i don't know of too many n/a honda's that put out those kind of numbers.
What kind of power you making bruno? I know what the setup is.

98_SI_Coupe:
Yes i would recommend doing all 3 at once, there are many company's that sell kits with all 3. I would also get an adjustable cam gear. Then don't forget tuning.
But i wouldn't run anything more than a stage 1 cam on stock compression. And a stage 1 cam doesn't usually require aftermarket valve springs and retainers.

LEITNER

has everyone forgot about the trottle body? that is the next thing you should do, it comes right after the cai so it is the next mod inline before cam and internals.

rice-01

take off the power steering belt

98_SI_Coupe

hey thanks for all the replies guys..Im tryin to do my research here...but not too good w/engine specs. so what will I gain w/ a throttle body and why would I take off the power steering belt?

zeeman

iTrader: (1)

you will gain some throttle response and a little whp with a larger throttle body. And you will gain like 1whp by removing the power steering....not worth the effort to convert to a non-power steering rack. And i wouldn't recommend taking off your power steering belt