another b6 question... sorry

[seanpaintsflames]

I know, I know. There are posts everywhere about this, use the search. I did. I just want to clarify exactly what I need for a swap. SO, I've got a carbed '89 4 speed P.O.S.tiva (there's a new one, for ya) that needs a swap. I'd like to put a b6 in it. Is this correct- I need the engine assembly (duh) from an 88-89 323, the CPU, and the engine wiring harness? If the motor has EFI, I have to replace (for some reason) the gas tank and fuel lines, too? If I want to keep the carburetor, I can switch out the manifolds, but also need to switch the cam? So, for the easiest route, get a carbureted 323 motor, the computer, and bolt it in, right?

Free cars are never really free.javascript:emoticon(':x')
Mad


Thanks!!

[jeffdjeffd]

Re: another b6 question... sorry

Is this correct- I need the engine assembly (duh) from an 88-89 323, the CPU, and the engine wiring harness? If the motor has EFI, I have to replace (for some reason) the gas tank and fuel lines, too? If I want to keep the carburetor, I can switch out the manifolds, but also need to switch the cam? So, for the easiest route, get a carbureted 323 motor, the computer, and bolt it in, right?

Okay - a couple of options here.

I you are staying carbed:
1.)Get a carbed JDM B6 from ebay. Probably keep the original Festiva ECU. It's usually a long block, so you'll use your own manifolds from the B3, assuming they'll fit.

2.) Get a junkyard B6 from an 88-89 323/Tracer. Bolt on your B3 manifolds. Use your B3 fuel pump (may also require using your B3 camshaft with the lobe for the fuel pump) or buy a chap low pressure electric. Use the carb from your Festiva. Use the Festiva ECU.

Want to go FI? The ya gotta start from stratch with the tank, fuel pump, fiuel lines, ECU, wiring - I always figure if you're gonna go to all of this trouble, might as well make it a B6t or BP. Too much work for a B6 only.

This swap is REALLY simple as long as you keep it simple and just bolt your Festiva stuff onto the B6 block.

hope that helps. Dang, I'm longwinded.
jeff

[seanpaintsflames]

okay, its making sense. I didn't realize that the 1.3 ecu and wiring would work for the 1.6. That seems so easy. No wonder people say it only takes a few hours. Will it make it much faster with the b6?

[Safety Guy]

You'll be going from 58 (carbed) to 82 hp (FI) in a sub-1800 pound car. That's over a 33 percent increase in power.

You tell me.

Now if you make your B6 carbed, it may not make 82 hp. I think the number would be closer to 72 hp. You'd probably get most of that back with the right carb & exhaust setup, though.

I'm going from 63 hp (FI) to a B6 with low restriction cat, muffler, and 2 inch exhaust pipe. I expect to get maybe 83 to 84 hp or so. The 84 hp figure would give me exactly a 33 percent improvement in hp (+21).

Karl

[jeffdjeffd]

I'm not saying it's the best way, but certainly the simplest. The 88-89 carbed Festivas used an incredibly simple ECU - most of the engine controls are vacuum feedback and a single wire O2 sensor. You're not changing much in engine displacement, and it is my slightly educated opinion that the feedback system will provide wnough fuel and airflow through the Festiva carb to run the larger engine just fine.

If you want to tune for more power, start looking into other carbs. There aren't many with flow rates low enough for our small engines, though.

BTW, I really don't notice much difference at low RPM between my B6 and the old B3. It's very noticeable at higher RPMs and on the highway, however. Mines an ATX, though - YMMV
jeff

[Safety Guy]

Jeff said he didn't notice much of a change at low RPM. This reinforces my decision not to go to a large exhaust pipe: 2" pipe should be perfect.

What size pipe did you use, Jeff? And do you have a stock header & downpipe with a low restriction cat and muffler?

Also, would the larger (BP) TB increase the low end?

What's your setup, Jeff?

Karl

[jeffdjeffd]

stock exhaust all the way - 1-5/8", stock downpipe, cat and oem muffler

BP throttle body, BUT my setup still runs rich (haven't figured that one out, yet). I also have a 4 wire TPS rigged to run off the 3 wires of the Festiva. The 4-wire must be from the auto B6/BP, so I'm ASSuming that the MTX B6/BP have a 3-wire, but I haven't found one yet, so mines still rigged.