I have a Stock CRX DX, and I just bought a crx si motor and tranny. I know how to swap over from DPFI to MPFI, HOWEVER, to autocross in the stock class, i need to have my intake manifold look like the DX manifold, SO, my question is

Can you do the SI ecu swap, wire up the injectors, and resistor box, BUT just run injector power wires from injector 1 and 3 to one of the DX injectors, and run the injector power wires from injector 2 and 4 to the other DX injector?

Yes i know that the injectors I'd be putting into the dx intake manifold have to be peak/hold, and not saturated like the ones are in there now are saturated. But i'm really wondering if the ecu can make each of the 2 injectors fire, but just twice as many times, because i'd be having half the injectors of a MPFI CRX SI?

Please help ,

Killa-X

 

If you need to run the dx manifold then keep the car dpfi and run the pm5 ecu.. I dont think it would work out too well to use the pm6 with 2 injectors..

The ecu is tuned to have the injectors right at the valves like on the mpfi setups..

 

yeah, that makes sense, but actually I found out that for STS and STS2 you can update your vehicle with any other vehicle that's on the same line as yours for the street prepared class. SO I can drop the si motor and tranny in my car and run STS without being illegal.

Killa-X

Thanks for the response though

 

Whats "STS"??

 

STS is the street touring sport class in SCCA solo 2 autocross racing. STS2 is an STS class but for only 2 seater cars like the crx.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Killa-X &raquo;</TD></TR><TR><TD CLASS="quote">I found out that for STS and STS2 you can update your vehicle with any other vehicle that's on the same line as yours for the street prepared class. SO I can drop the si motor and tranny in my car and run STS without being illegal.</TD></TR></TABLE>

Wrong, wrong, wrong........

 

Just a question here, Im not an autocrosser but.. Couldnt you just swap out the badging on the car from dx to si.. As far as I know both have a sunroof and look the same.. So you could run a d16 motor in your dx..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">Just a question here, Im not an autocrosser but.. Couldnt you just swap out the badging on the car from dx to si.. As far as I know both have a sunroof and look the same.. So you could run a d16 motor in your dx.. </TD></TR></TABLE>

No.

 

You could, but that would be illegal. Plus not all DX CRX had sunroofs. My 90 does, but that's aftermarket, my 91 does not.

oh and .RJ, just because somebody poses a question like it's their car, does not mean it is in fact their car. I posted this thread originally because another DX car in my class accelerates WAY faster then my DX does. And rather than asking some dumb question like..

There is a guy in my class that has a DX just like me and I think he converted it to the PM6 ECU, for better timing, and fueling, but just left the DPFI on there. Can this be possible? I would have sounded like a total moron. And nobody would have written anything, or else they would have said something like you did.....NO.... And really that doesn't help me figure out what this guy did to his car to make it faster. Because he still has the dx tranny in there, but it makes more power.

So for anybody that might read this post, I don't have mpfi on my dx for autocross, but I do have illegally wide tires. lol

 

Well, Im thinking that you might actually be able to run the pm6 on a dual point.. You would still need the mpfi dizzy but If you wired the injectors together you can fire the 1 injector for 4 cylinders..

Im not saying this is perfect since it isnt but you might be able to get it to work.. If you fire the primary and secondary injectors at the same time then you would run really rich on the low end so you will have to get the pm6 chipped and do some tuning on it..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Killa-X &raquo;</TD></TR><TR><TD CLASS="quote">I posted this thread originally because another DX car in my class accelerates WAY faster then my DX does.</TD></TR></TABLE>

Not always the car...

 

QUOTE=.RJ]

Not always the car... [/QUOTE]

NO **** BUDDY, But when i've driven both the cars, i think your theory of driver error is out of the question.[

 

I want to see how this ends...

 

Well RJ is the big man on campus, so i'm sure he'll come up with something sassy to say. Gotta put the newbies down

 

*shrug*

 

Indeed