b20civic

Okay guys, What boltons give the most peformance to the F23a1? Looking to stay NA, no forced induction or Nitrous please . Is I/H/E they way to go, or are there other better mods for performance? Im looking to break the 150whp/150wtq mark with boltons NA. What will it take? Please be specific with which brands are best. Thanks.

thabao

okie the i/h/e is the best simple idea. if you have a 4cly ex accord, aftermarket header have the same flow as ex header. but after market are lighter.

i recomend megan header cause they cheap in price, get a highflow cat, and a cat back. i have a apexi cat-back forsale if your interested.

you could also do a mild port and polish, it's kinda pricey depending on where you go but it helps alot.

also a better intake manifold and TB is good.

other people may know better stuff than me.

Hammer99ex

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thabao &raquo;</TD></TR><TR><TD CLASS="quote">okie the i/h/e is the best simple idea. if you have a 4cly ex accord, aftermarket header have the same flow as ex header. but after market are lighter.

i recomend megan header cause they cheap in price, get a highflow cat, and a cat back. i have a apexi cat-back forsale if your interested.

you could also do a mild port and polish, it's kinda pricey depending on where you go but it helps alot.

also a better intake manifold and TB is good.

other people may know better stuff than me.</TD></TR></TABLE>

hit it right on the head of the nail, however, there are no aftermarket intake manifolds for this motor. ive searched high and low but to no avail.

if you want a bigger TB, check out maxbore.com he specializes in honda TB's then just take ur stock manifold and bore out the opening to match your modified TB.

thabao

hey hammer99ex i forgot to put that for the intake manifold, you use ones off other cars. i'm running a h23 manifold on f22. seeing he has a 2.3l, it should be an exact fit even with the ports. so yeah getting a h23 manifold would be cheaper than a bored or ported stock mani ha.

b20civic

Okay, so leave the EX factory exhaust manifold on there.

What diameter exhaust would be good for my power goals? 2 1/4 or 2 1/2 assuming the piping is mandrel bent? Match that with a carsound Cat.

As far as intakes, is the AEM coldair the way to go?

For the intake manifold, are there any OEM manifolds that can be swapped for more power, the f23 looks pretty good already? What size is the stock throttlebody and what size should I bore it to? Is the TB swap dyno proven at this power level?

thabao

i had a 2 1/4 exhuast. anything bigger than 2.5 and it'll rob power unless you like boost or something. my apexi ws2 is 2 1/4 was great with a vibrant hi-flo cat.

i heard some bad things about AEM, i'd get injen cause i heard alot of good things about them. for you, you live in florida and some areas flood alot. so if you get a CAI that'll go into your bumper, get a by pass to stop sucking up water. or just get a short ram, short ram sound cooler haha.

the intake manifold i'm not sure of, the h23 manifold on my car gave more flow and increased my low end torgue by some bit. a swaped or bored tb will make a diff, not a big diff but enough to make your car flow better.

some other members will explain much better, i dont know the tech stuff well haha

Hammer99ex

it doesnt hurt to look on ebay. quite a lot of stuff on there from blue light specials to name brand. its there, trust me.

TouringAccord

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thabao &raquo;</TD></TR><TR><TD CLASS="quote">the intake manifold i'm not sure of, the h23 manifold on my car gave more flow and increased my low end torgue by some bit. a swaped or bored tb will make a diff, not a big diff but enough to make your car flow better.</TD></TR></TABLE>

you have a H23 IM on your car? Or are you referring to a intake, not a intake manifold?

The H23 IM would take some modifications to work properly.

op, stay with the stock F23 IM and just get the throttle body and plenum opened up by MaxBore.

thabao

oh yeah haha thats true haha, forgot about ebay. i remeber when i first got my accord, a ebay intake will work great, i wrapped my intake with thermo foil and thermo wrap and stayed good, my injen right now is wrapped up, and my headers are wrapped too. haha i was going to wrap my exhaust cause i didnt want it ruined haha.

ebay headers are alright, some are better than others, it's a hit or miss with those. exhaust should be okay for a couple months, i would get a cat-back off there and swap off the muffler later on.

i would get cats off there, test tubes are gay and the cats are made very well most of the time.

thabao

hey, touring havnt talked to you in a while, i have a h23 intake manifold on the head. it fits perfect just the ports dont match up well. i just need to shave the openings bigger to match, i saw some DIY online.

accord99power

is the throttle body and ports bigger on the h23 than f23, which DIY did you use to do the conversion?

thabao

hey, i have a f22 so the h23 is bigger. i'm not sure what the f23 looks like but when i did the DIY search for my car, i saw a bunch for f23 to h23 conversion. i'll try to find something.

TouringAccord

yeah, I sent you a message on here about your car but I never heard back from you. Send me a PM

ah, ok. I wasn't sure if you did or didn't. The F22Bx and F23Ax heads have the same port shape and spacing. The H23 shares the same spacing but the ports are very different. For the F23Ax engines and F22B1 you would have to do more work than on the F22B2 due to the VTEC solenoid.

Did you have any issue with the coolant ports? Those looked like it was going to be close if it worked or not.

I had a H23A1 IM for my F22B1 when I was planning to build it and swap that into my hatch but my plans changed and I sold the H23 IM. I still have a spare runner section and the F22B1. There is a lot of work that should be done on the intake ports as well as on the coolant passages. If I remember correctly the coolant passages don't line up perfect and they aren't the same shape either.

Also, how did you hook up the secondaries? Do they function properly or did you remove them from the IM?

accord99power,
if you'd like more info on the H23 IM swap, check out the FAQ. There are a couple links in there about it. One was just swapping it on and the other the user was going to much great lengths to match everything up (don't think he ever finished it though).


Modified by TouringAccord at 8:12 AM 3/31/2008

accord99power

interesting info thanks touring

lovemyHonda6

sorry for reviving a dead thread, but I dont want to be butchered and told to use the 'search' , the H23 intake manifold seeing as this was over 4 years ago. Any progress people know of on intake manifold modifications for the F23A1?

hondamark35

do a search for threads by user AFAccord. he went pretty far with his N/A F23A1 before pulling it all apart for forced induction. as i recall he did a custom adapter to allow the H23 intake manifold to be fitted to the F23 head.