biggest challenge for you or for anyone who'd try twincharging would be synchronizing the supercharger and turbocharger.

 

Could you expand on what synchronizing would need to occur? The two setups I'd be looking at are:

1) Serial: Turbo feeds directly into the throttle body before the supercharger. Existing bypass valve remains untouched, supercharger remains engaged throughout the RPM band. As the turbo builds pressure, the supercharger further displaces it with a final boost being additive between the two, no additional control circuitry would be needed, though internals would need to be swapped.

2) Parallel: Electronic clutch and bypass valve control are added to the supercharger. When the turbo spools up, the supercharger clutch disengages and the bypass valve opens. At Low RPM's, supercharger provides boost and quicker spool up for the turbo. At higher RPM's, s/c is disengaged and only the turbo operates. A lower top-end boost will occur, but advantages are gained in a greater low-end torque from the s/c, faster spool-up time, and no parasitic loss in the upper RPM from the supercharger. This is the approach VW has taken, mechanically more complex but also more fuel efficient and potentially safer for the engine. Should be safe on stock internals.

If option 2 is employed, the only things I would need to sync are the s/c clutch and the bypass valve. Coupling the existing RPM signal with an A/D convertor and small microcontroller to send out a disengage signal would be pretty easy. The hardest part would be machining an actuator mount to open the bypass valve.

 

Option 1 is the best way to go. It is exactly as stated - no additional work is needed.

Option 2 is more than than the job is worth. It will work as described, but, there is more than meets the eye. The management for this setup will be fairly complex, there is a fueling issue as well as the ign timing. If it was posible to run a stand alone management system & pass emmissions, it would be posible to overcome these issues.

I believe that VW purpose built the internals for the twincharger. There may also be many other sensors added to the management, such as intake manifold temp, revised upstream O2 placement, etc...

Bottom line: Either way there will be some tuning issues, although option 1, with e-manage tuning, offers the easiest solution..... me thinks.... If that's what you want to do..... GO FOR IT!

 

If I could build the bottom end at a reasonable price I'd go Option 1. Maybe if can find rods and pistons under 1k or have a exceptionally large tax return I'll consider it, otherwise I'll be going bottle fed with a 20 HP shot. PTuning has a ZEX wet kit for the xB, would most likely have them do the install and possibly retune. I need to find out how much the automatic can reliably handle, don't want to do an early transmission rebuild. If I do go the nitrous route, I would like it functional though, I've seen some xB's that only route it through the purge ports for show purposes; don't want to dig at anyone, I'm just trying to stay away from installing anything I can't use while driving or for daily use. if I go show, it whould have to be all out, trailor only and I am not in a position to make that commitment at this time.

 

A 20 shot just works! Best HP you can get for the $$$.
Even if you got the BIG tax return, you'll end up without your DD for some time.... The XB is NOT a race car... but you sure can suprise the crap out of some go fast street fighters... A 20+ shot & SC combo, you'll see.... It's enough.

 

brashboy.com has a twin supercharger setup or with the blitz supercharger inconjunction with the greddy setup ... you would have to fabricate a new bracket system for the supercharger you can mount the supercharger lower ... And then you can wire up a map sensor instead of having the blitz selector switch, to turn off the supercharger at a certain psi ... Then you'll be twin charge....

 

just googled "brashboy.com"????? it's not http:// www.brashboy.com .................

A twin supercharger set up? On a 1.5l? Why not an M62? Got to see this setup.........................

 

Right here! I actually ran across this setup a few days ago, pretty sick looking. Heres a link to the kit on their yaris. Theres alot of other 1NZ stuff too if you look around.

http://www.brashboy.net/english/dualyaris.html
$15,000 anyone??

 

15k, so that's the conversion rate on 1,741,950 yen? Wow, I could do the same job for half.

2,300 - Greddy s/c
1,800 - Greddy turbo
-100 re-sell second eManage blue that comes with turbo
200 - injectors
100 - fuel pump
150 - fuel rail
480 - forged rods
600 - low compression pistons (hopefully they come with rings)
400 - two+ hour tune session

5930 TOTAL

Of course, I'd be providing all the labor free for my build, maybe add $500 to do the build on a second engine. Anyone want to donate 3480 to me, I'll promise I'll post pics of the install.