B3-E Turbo/Supercharger Capabilities

[bhearts]

Oh yeah, there's definitely going to be a larger throttle body on it for sure. I mean, these are two dissimilar cars, but my 2006 Passat 2.0T has a relatively small throttle body, so who knows, we may be able to get away with it. As of now, I've got to focus on fixing some of the rust before the engine. I don't want my bumper to let loose or have my swing arm mounting points to go.
Sorry for the lack of communication everyone, but I was on vacation for a week.

There's a huge difference between blowing through the throttle body, and drawing air through it.
Gm v6 supercharged cars draw through a 68mm throttle body and made 240hp, while we're expecting to draw though 50mm to make 100hp.

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[jdobbs86]

*chiming in because I know something relevant*

As a practical example, turbocharged Chevy Corvairs used a teeny tiny carburetor in front of the turbo in lieu of a waste gate to limit boost...which in turn limited power and actually (or so I've read) attributed to lag.

On an unrelated note, I know that the carburetor was not placed in front of the turbo merely to limit boost. I am currently fascinated by draw through carbs and turbos, no judging. I am also aware of the mechanical boost retard which I think is equally awesome, and I'm sure I am over simplifying stating just those two systems. Stay tuned for my own thread on the subject in the future.

[ZephTheChef]

As much as I love superchargers these days, the install will be a pain in the butt requiring lots of custom parts...drive system, mounting brackets, adapter plate for the outlet, throttle body adapter unless you're going to blow through the stock one (which is not a bad idea), etc. Superchargers are physically giant compared to the size of turbo you would run on one of these so space is also a bigger issue. There's also the parasitic losses, worse thermal efficiencies, etc. It makes zero sense unless you're just trying to be unique. It would be super nice to have more immediate torque for climbing hills without downshifting, but there's minimal lag with a properly sized turbo anyway.

I only have a few pictures of my Aspire setup...it was a super quick and dirty job with parts I had laying around. TD04-9b turbo from a Mitsubishi 3000GT VR-4. Honestly, it was a little large for that car, but I had plenty of them laying around...those turbos will do about 175HP each if you turn the boost up. I had zero fuel management whatsoever, I just ran E85, upsized the injectors properly and bumped the base fuel pressure with a cheap regulator. It was bundles of fun, but kept wiping out clutches and head gaskets. Of course, to be fair, my wastegate was welded shut and as a result the car was probably running over 20psi.

As far as how it's setup, I chopped the stock manifold, flipped the flange and re-welded it. Then I welded on a J-pipe which I welded directly to the turbo housing. Super ugly, but it worked great. I ran the intake out of the turbo down, through the MAF, and then right back up to the throttle body. Cut a hole in the hood cuz why not? I could have made it fit, but I decided it would help turn some heads/get some WTF looks. The oil feed is put together with a Tee and barb coming off the oil pressure sender, and some stainless braided line that I had clamped onto it. I believe the oil return was just a barb I installed in the oil pan and some 1/2" rubber hose.

This was literally done over the course of 6 hours or so on a budget of about $20 plus whatever I already had laying around, so try not to hate too much based on the build quality, lol. I eventually sold the car to skrapbob after I got tired of putting clutches and head gaskets in it...then subsequently bought enough parts back off of it from him that he nearly made his money back, lol. I think if you did a similar setup and actually ran a reasonable amount of boost it would hold up just fine.

[ZephTheChef]

There's a huge difference between blowing through the throttle body, and drawing air through it.
Gm v6 supercharged cars draw through a 68mm throttle body and made 240hp, while we're expecting to draw though 50mm to make 100hp.

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That's still draw through vs draw through though, B. The more valid comparison is the 67mm GM supercharged throttle body @ a stock 240hp draw through vs the smaller 60mm 3000GT VR-4 throttle body @ a stock 320hp in blow through (and guys have run 800+hp on stock throttle bodies). You can get a lot more air mass through a given throttle body under boost pressure than you can at atmospheric pressure.

[Advancedynamix]

Good to see you back on here Zep. Can't hate on a 6 hr turbo install. Was it hard to service the head gasket with the turbo welded to the manifold?

[ZephTheChef]

Good to see you back on here Zep. Can't hate on a 6 hr turbo install. Was it hard to service the head gasket with the turbo welded to the manifold?

Harder to get the intake manifold off than the exhaust, lol. I am pretty sure I just unbolted the turbo/manifold assembly, and the drain line and swung it out of the way. It probably added 10 minutes to the job. In retrospect, I wish I had taken the time to do it right and at least get a rising rate regulator after replacing the gasket, that car was a ton of fun and I would have loved to play with it more I was just getting frustrated. I am sure my AFRs were way out of whack on that thing. I am not 100% sure it was the head gasket the second time it started smoking...I never tore it down again to find out.

[bhearts]

I welded my turbo to my manifold also. I tried twice to match the turbo flange to mate to my manifold, and it didn't work. Worst that could happen, turbo exhaust housing crack. But anything is fixable.

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[88nStillAlive]

I too may be interested in converting my b3 to a turbo. Does someone make the manifold to convert it? Or does the exhaust manifold have to be a custom job?

[sketchman]

Custom.

[dannythatguy]

I know this isn't a turbo head, but it may be a bit easier (maybe?). I found a re-machined head off an 87 Escort GT; will that bolt up to the B3 block, or would it just be easier to drop the Escort GT motor in it

[bhazard]

I know this isn't a turbo head, but it may be a bit easier (maybe?). I found a re-machined head off an 87 Escort GT; will that bolt up to the B3 block, or would it just be easier to drop the Escort GT motor in it

No and no. Completely different engines. That's a ford engine you have there. The festiva is Mazda.

[ZephTheChef]

I too may be interested in converting my b3 to a turbo. Does someone make the manifold to convert it? Or does the exhaust manifold have to be a custom job?

PM sent.

[dannythatguy]

No and no. Completely different engines. That's a ford engine you have there. The festiva is Mazda.

Ok, so the B3 in my Aspire and your Festiva's aren't even close to the Escort GT block or head?

[bhazard]

Not the 1st gen escort. The 2nd gen GT with the 1.8 is the BP.

[dannythatguy]

I found a swap, however, I need to figure out if I can get the axles to work, what kind of engine mounts I'll need, and if I have to modify the firewall. Since I was a VW tech for a bit, I found a 2.0 ABA motor/trans/harness for $400. I've worked on the car it's from and it's a runner. I just need to save up and see if I can make it work. Also, I found a supercharger from a Mazda Milenia if anyone knows about them