How to make 30+hp for $500 or less... (DX/LX F22A1 only)

[19dabeast85]

there is a video thread where the dude did this and ran it inside his car to diminstrate when they kick on. i dunno where it is though.

I made that thread:

IAB controller link

In summary: hooking the IAB directly to a vacuum source will hurt your bottom end significantly, it's very important to have an ECU that can ground out the IAB switch!!!!!!!!!!!!!!!!!!!!!!

[johnnyo032003]

so like i think i just fell in love with my f22a4...
i just need a diff intake mani. throtal body. cam. something else and ehaust. which im getting soon.. just gotta save 50 $ more

headers is what you are thinking about and you don't need headers unless you go aftermarket cause your car already has it... i suggest you get your throttle body bored out i am getting it done for the h22 when i get some money also building an intake for it soon so it will really scream when i take it to 7800 rpms... 87mm t/b will probably make some horsepower... i don't think you will make that much power on what you want to put on... oh, and don't just jump into an h series intake mani till you are sure the iac valve plugs match up i don't have mine off yet to test for you but yeah... i'm tired now going to bed btw call me when you have time to hang out during the day pref. on a wednesday cause i want to take you for a ride in the h22 sometime...

[CB7Man]

Different design than which?

The A6 is also 4-2-1, and in at least some cases, the downpipes are identical.

Lol no that is straight wrong
A1 and A6 both use the Cast Iron 4-1 with the O2 being directly connected to the manifold.
A4 uses the tubular steel 4-2-1 design, O2 being connected at 2-1

90-91 Accord EX have F22A4
91 SE had A6, it MAY have had the A4 header/downpipe as well, most likely not

If you have seen it on an 92-93 A6, it has been added period.
Downpipes are NOT identical, identical in length only, they bolt up the cat the same however
A4 has 2 inlets, A1 has 1 inlet
A1 and A4 are not interchangable
A1/A6 are the SAME

An A4 header/downpipe combo is an upgrade over your Stock A1/A6 header/downpipe. Same exact performance as a DC Header, plus its smog legal OEM.

There is a possibility that the bolt holes for the downpipe are not drilled the same on the A4 and the A6.

I have seen some A6 downpipes bolt up to the A4 upper manifold, but Fizzbob says he has seen some that don't.

The easiest way to avoid that problem would be to make sure you get the whole thing from the same car, or double check the patterns before you buy.

You are on crack LOL!
A1 and A6 are interchangable!
A4 (if its an original A4 header mind you) is the only different header, fits no others
Need Pictures?
A1/A6

A4

[dark_stalker]

my a4 header looks a bit bigger then that a4's.

Lol no that is straight wrong
A1 and A6 both use the Cast Iron 4-1 with the O2 being directly connected to the manifold.
A4 uses the tubular steel 4-2-1 design, O2 being connected at 2-1

90-91 Accord EX have F22A4
91 SE had A6, it MAY have had the A4 header/downpipe as well, most likely not

If you have seen it on an 92-93 A6, it has been added period.
Downpipes are NOT identical, identical in length only, they bolt up the cat the same however
A4 has 2 inlets, A1 has 1 inlet
A1 and A4 are not interchangable
A1/A6 are the SAME

An A4 header/downpipe combo is an upgrade over your Stock A1/A6 header/downpipe. Same exact performance as a DC Header, plus its smog legal OEM.



You are on crack LOL!
A1 and A6 are interchangable!
A4 (if its an original A4 header mind you) is the only different header, fits no others
Need Pictures?
A1/A6

A4

[accordaffair]

lol no you are straight wrong, a6 is a cast 4-2-1, I have one, and it's not an a4

[C91BLX7]

WOW mine is cracked in the same exact spot

[deevergote]

The A6 is a 4-2-1, as pictured. It is not, however, a tubular design... which makes some difference.

There has been NO PROOF than the A4 header is as good as or better than the DC Sports design. However, the DC design is fairly expensive in comparison. Aside from the Bisimoto header that should be released soon, there are no F22A headers that give significant power increases. The A4 header, then, is the best choice for people on a budget. A $25 junkyard piece that gives roughly 5hp (crank, not wheel) over an F22A1 manifold is MUCH better than $250 for a DC Sports header that gives MAYBE 8hp... or $100 for a cheaper knockoff that gives maybe 6hp.

[accordaffair]

WOW mine is cracked in the same exact spot

So did mine, I think most a1's get a crack there after a while, then it starts getting loud

[accord junkie]

hey hey heres a doozie ive been working on this swap for a bit now and i have the a6 ecu in and the cam from the a6 installed sucsesfully.but heres the thing i ran all the tests before installing the a6 i/m so i ran pink 2 pin#17 and black/yellow 2 same on distributer the valves seemed to be woking but they wouldint release.so heres the doozie i noticed a nob looking thingy and so i started turning it and it broke off well my valves then opened and stayed open and the thingy that broke off looks like some kind of pressure relief hmmm not 2 sure if the switch even works but when i plug the niple that the nob thing was on the valves close take my finger off and they open does any1 know what this nob thing is and if theres a way to fix this prob.

[PakaloloHonda]

Ummm .. why is'nt this a stickie yet?

A Hui Hou !!!
Tomi

[Leung]

So did mine, I think most a1's get a crack there after a while, then it starts getting loud

i saw an A1 header at the pnp that had a crack in the same area also.

[phantomcb7]

Ummm .. why is'nt this a stickie yet?

A Hui Hou !!!
Tomi

x2

This is really valuable information

[owequitit]

Lol no that is straight wrong
A1 and A6 both use the Cast Iron 4-1 with the O2 being directly connected to the manifold.
A4 uses the tubular steel 4-2-1 design, O2 being connected at 2-1

90-91 Accord EX have F22A4
91 SE had A6, it MAY have had the A4 header/downpipe as well, most likely not

If you have seen it on an 92-93 A6, it has been added period.
Downpipes are NOT identical, identical in length only, they bolt up the cat the same however
A4 has 2 inlets, A1 has 1 inlet
A1 and A4 are not interchangable
A1/A6 are the SAME

An A4 header/downpipe combo is an upgrade over your Stock A1/A6 header/downpipe. Same exact performance as a DC Header, plus its smog legal OEM.



You are on crack LOL!
A1 and A6 are interchangable!
A4 (if its an original A4 header mind you) is the only different header, fits no others
Need Pictures?
A1/A6

A4

You might want to go actually work on a CB7 and check your facts.

1) The F22A1 had a 4-1 design that dumped into a single downpipe just after it passed the bottom of the head. These manifolds are easily identifiable by the O2 sensor that is right in front when you open the hood.

This engine can be found in 1990 and 1991 DX and LX trim level Accords.

**In 1992 this engine became known as the F22A4 when the EX was upgraded to the F22A6. The F22A1 became a designation for the engine in the 1992-1996 Prelude S.

2) The F22A4 had a tubular 4-2-1 design that was very similar to many aftermarket headers. It was made of double walled welded tubular steel on both the top half of the manifold, and the bottom half, or "downpipe."

When the DX/LX engine became the F22A4 in 1992, it retained the 4-1 cast piece from the 1990-1991 F22A1.

3) The F22A6 has an exhaust manifold that is EXACTLY the same as the F22A4, from the 1990-1991 EX in principle. It is a 4-2-1 design, just the same as the 1990-1991 EX. The only difference is that the upper part was cast like the DX/LX part, and no longer featured double walled tubular welded construction.

The downpipe on the F22A6 was still 2-1 and it was still welded tubular steel. I know, because I have seen many.

4) I have personally removed and bolted F22A4 upper, and F22A6 lower halves together. I have not had a problem.

Fizzbob has said that he has, because even though the downpipes are identical overall, he said the bolt pattern that joins the two halfs together was different. That is why I made my comment. "Caveat Emptor."

5) The 1991 SE also had an F22A6, and it was also a 4-2-1 design. Everyone I have actually seen was a welded tubular design just like the 1990-1991 F22A4, so I imagine that you would find a cast upper half on the 1993 SE since that is what was also going on the F22A6 in the 1993 Accord EX.

I think YOU need to check YOUR facts, probably before you come on here telling people they are on crack, when in fact YOU are the one with YOUR facts crooked.

Unless of course, you want to prove me wrong. And, oh by the way, showing a picture of the upper half of an A1 manifold proves nothing.

It should also be noted that due to the double wall design of the stock F22A4/A6 lower half, that the actual collector diameter is about 1.75" ID, whereas the DC Sports and other copy-cat headers (Megan, OBX, etc.) is 2", so in addition to better collector design, there is most likely a slight flow increase on an aftermarket header design.

However, the stock piece will be much stronger, more durable, quieter, will fit better, etc.

[90Cb7sleeper]

**In 1992 this engine became known as the F22A4 when the EX was upgraded to the F22A6. The F22A1 became a designation for the engine in the 1992-1996 Prelude S.


When the DX/LX engine became the F22A4 in 1992, it retained the 4-1 cast piece from the 1990-1991 F22A1.

I don`t know if i read this wrong, but i thought f22a4's were only in 90-91 ex's?

both of my 92 lx's have/had f22a1's in them.

[deevergote]

Ummm .. why is'nt this a stickie yet?

A Hui Hou !!!
Tomi

Because NOBODY reads the stickies. Ever. Trust me on this one...





And Scott, I'll have to disagree with your claim that the F22A4 was in the 92-93 LX/DX... the F22A4 designation ended in 91. I've worked on quite a few 92-93 LX/DX models, and even owned 2 myself... all had F22A1s.

I'll have to check out the manifold on a 91 SE... I never even considered that it would be tubular... that has me curious!