I believe I have everything, but would I need the pm6 ecu? also, what would change with vaccum stuff and egr? thanks!

 

how are you going to put an HF manifold onto a A6 manifold? Are you going to stick the headers together or something and make some kind of a special turbo supercharger or something? hahahahaha

 

are you talking about the intake manifold?

 

ya what else

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRXVTEC69 &raquo;</TD></TR><TR><TD CLASS="quote">how are you going to put an HF manifold onto a A6 manifold? Are you going to stick the headers together or something and make some kind of a special turbo supercharger or something? hahahahaha</TD></TR></TABLE>

as much as I would love to do a supercharged turbo , I have no intentions on this engine. if I were talking about the headers I would have said header...

but I would only be doing this as something to do, as this engine is very very slow... plus it would make a swap even easier on this car for the next owner

 

ok so back to the question.... has anyone done this before? I would assume it would be the same as doing a ZC swap in the hf's... more info?

 

well if you JUST change the intake manifold, the only problem I see is bolting it to the block. I do not know if it bolts up or not, but I would say that it does. Might as well use the Si fpr as well. I'm not sure if you would need to change over injectors or not. If you keep the Hf distributor, injectors, etc everything from the Hf and just change the manifold, I would say keep the ecu in your car now. Also, get the A6 T/b. New intake manifold gasket as well.

You might as well port the A6 manifold while you are at it.

 

man,what are you all talking about? it's all simple

the HF/SI intake mannis are the same except for the size difference.so with that in mind,just swap over to the SI manifold using the SI TB, the injectors are the same,so your set there, no vac lines will have to be changed,no wires no nothing, it's just a stright manifold swap.

as for the ecu qustion, SI is ecu is better because of the fuel/ing curves VS the HF ecu, and also the redline on the SI's ecu is higher. The hf ecu will work just fine,but if you want just a little bit more power then get the SI

the sohc ZC intake manifold will bolt up just fine also, but i'm not sre if it flows any better then the SI's

and like mach69 said, just do a DIY port-n-polish while your at it

 

i'm not sure if the si ecu likes the hf distrobutor, but the manifold swap is super easy, take off bolt on.

also, there may be a couple wires you have to sever so you won't pull codes with the si ecu, if my memory serves. I'm not sure, as i've never had an hf.

good luck

 

the si dizzy and hf dizzy are the same thing,there both set-up to run a mpfu system (CPS sensor). so it'll work

 

great! so what do I do with the wires going to the EGR stuff on the hf manifold? won't it throw a code if theres no sensor attatched when the HF ecu is looking for it? also, I have never done porting before... any reccomendations? I have a dremel tool, but I don't know what else I might need... electric dril and bits?
thanks very much!

 

also, what about the vacuum stuff? do I have to get the purge cut off and map sensors from an Si?

 

dude i just did this swap in my car 2 days ago and i just cut off the egr cuz theres no place for it on the si manifold and theres gonna be two hoses towards the back that your gonna have no place for because theres no place for them on the si manifold but there were places on the hf. other than that everything else is completely bolt up. i also put an si ecu in the car and i can honestly say after experiencing it first hand that its not worth the effort. I could hardly feel a performance increase and now my car idles at 2500 rpm.

 

Why put the SI ECU in the car? You talking about a motor that was designed to not rev past 55k and the SI isnt that a little more? the HF ECU in a non chipped form is for a 8valve 5.5k reving non HP monster. The SI ecu is for a 16 Valve 6or7 reving beast. There seperate ECUs in non chipped form.

The SI manifold should add another 5hp maybe on you 70hp screamer. The motor is your drawback. its not a motor designed to just blaze around town with, well unless your going to work 50 miles each way.

And that is why this summer i will be blowing one up with a 14b and about 10lbs of boost. Seriously the SI manifold should be ok on the block use the HF ecu. Its made for the car, or chip it and run turboedit. Either way. best bet would be to instead of buying a Manifold is to just save 50 dollars more and buy the d16a1.

 

the D16A1 wont bolt into our cars, but the D16a6 will, the a1 came outta the older integras while the a6 came out of our gen's si's

 

I meant D16a6. Reasearching D parts ownz me. start getting the motor all mixed up.

 

lol... ya I bought the manifold and everything with the thoughts of polishing the stuff up and listing on ebay... about $46 worth at the junkyard... should I just sell it all or put it on?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C1 ’96 Coupe &raquo;</TD></TR><TR><TD CLASS="quote">

The SI manifold should add another 5hp maybe on you 70hp screamer. The motor is your drawback. its not a motor designed to just blaze around town with, well unless your going to work 50 miles each way.


</TD></TR></TABLE>

I agree. Its not only your motor that is a drawback, its also the TALL *** gearing of the HF tranny.

Doing this intake manifold swap in my opinion is not even worth the minimal gains. If a customer asked me to do this, I would tell him to save his money.

The whole intention of the HF motor is for economy. Hence the HF " High Fuel" model. The motor, tranny, ecu, thinner axles, lightweight chassis, etc. is all AIMED towards economy and NOT Performance!

The HF is a great model for a rolling chassis to do a swap in though . But to make performance gains from the original HF powerplant is pointless.

My 90 CRX HF with a JDM Type R engine and tranny with a 50 shot ZEX ran consistant 12.27 @ 114 mph all season long last year. Completely street legal, full interior, daily driven, etc.

I drive to the track, bolt on my slicks and pull low 12's. I also roadrace my CRX at St. Cloud, DCTC, and Brainerd International Speedway. Last year I was at MidAmerica with my DA Integra. This year I want to take my CRX out there.

Good luck with what you decide.

 

alright thanks! I will probably just sell the parts on ebay or something then, I appreciate the input!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aaronhume &raquo;</TD></TR><TR><TD CLASS="quote">alright thanks! I will probably just sell the parts on ebay or something then, I appreciate the input!</TD></TR></TABLE>

No problem, glad I could help.

You have a good starting point there. You have the lightest YEAR CRX and the lightest TRIM!

1988 HF Baby!!!

I have a 1990 Honda CRX HF, but with 1988 doors ( the ones WITHOUT the seatbelets on them )

So Im forced to use Sparco harnesses everyday for daily driving

That year and model chassis is a great rolling chassis to do a swap in! Its a feather!

 

ya no joke... me and my friends like to show off by lifting up the back end and moving it LOL... but a good friend of mine is gonna buy it and he wants to do a B16 turbo project out of it to add to his collection... so for now its just my working car until I get my 89 civic runnign with the b16.... :/

and no I'm not gonna just put that motor in the crx.... lol