Supercharged MC?

[Alan Kramer]

Mike,

I'm seriously considering going with a Eaton M90 supercharger in place of a 
turbocharger for my CGT turbo project.  The M90 can be found in the boneyard 
on many 'murican V6's including the T-bird SC (88-95).  It uses a 5 rib 
polydrivebelt which is great 'cause the Corrado G60 used a similar 5 rib 
belt to drive the G-lader... and the 'raddo crank pulley bolts up to the I-5 
crank.  I'm planning on running the M90 at 1:1 ~ 6psi, mounting it in place 
of the PS pump, removing the PS rack and using a MS rack.   I plan on 
routing the air through a stock CIS (non-E) setup, then through a pipe 
around the back of engine through where the battery used to be, then up the 
side of the motor to the intake of the SC.   Only the dipstick tube is in 
the way, and it can be bent easily out of the way.  The outlet from the SC 
will go to a single-pass intercooler across the grille, and exit via a short 
hose to the intake of a 5kt IM.  I plan on using the the MC block, NF head 
with MC exhaust valves and 4kq exhaust, and adding the knock sensing 
ignition from CIS-E3.  That along with the Scirocco rear discs, CGT rear 
calipers, 4kq front sway bar will make this car the enough of a parts-bin 
mutt that Ingolstadt will be jealous...

My other option (besides using the turbo) is to put a Gti engine in, using a 
4k FWD subframe for the engine mounts and a 4k FWD tranny & driveshafts.  
The reason I'm considering this is because there are a bunch more 
*signifciantly cheaper* bolt-on upgrade options for the 4 cyl motor than for 
thr 5 (like EFI).  And really 200-225 hp is about the max IMO you 
realistically want for a FWD car, and the 4 cylinder is very capable of 
that.

Anyway, I'm waiting for winter to start on assembly.  I have all the parts 
'cept the supercharger and crank pulley to make this work if I go the 5 cyl. 
SC route Frankly, I think both of these options are eaiser than a turbo 
transplant.

------------------------------------
Alan Kramer
http://www.geocities.com/audikramer

'83 CGT
'85 CGT "project"
'86 4kcsq



>From: Michael Gough <mdg3369 at altavista.com>
>To: quattro at audifans.com
>Subject: Supercharged MC?
>Date: 26 Jul 2001 14:21:34 -0700
>
>Hello everyone,
>Having my turbo quantum syncro running has given me some time to think 
>about the next step and also has made me longing to tinker with it some 
>more. So here is what I've come up with, any constructive criticism is 
>welcome.
>Use the stock MC bottom end with 7:1 pistons, or a thicker head gasket or 
>shave the pistons if they can be shaved enough. On top of that, either an 
>MC head with 40mm NG intake valves, or NG head with MC sodium filled 
>exhaust valves. A roots supercharger can give 10+ psi of boost off idle 
>which will mean the low CR won't hurt performance. I would need an 
>intercooler, but I could either use water/alcohol injection, or an 
>intercooler built into the intake manifold like some of the callaway turbo 
>cars used. An EFI system would give me plenty of fuel, and either the NG 
>knock sensing or the MC ignition would work. The JT header or a custom 
>header would flow well enough I think.
>I know a turbo engine could make the same power, and I know that it would 
>be easier since they are already engineered and everything, but I haven't 
>ever seen a supercharged Audi I5 and I wanna do something unique like that.
>Just looking for some feedback, maybe there is something major that I'm 
>neglecting to realize. I know where a SC will fit. It will go right where 
>the power steering pump is along side the engine, and then the PS pump 
>could be relocated easily I think.
>Still have a lot to think about and look at but I think it could work.
>Mike
>
>
>Find the best deals on the web at AltaVista Shopping!
>http://www.shopping.altavista.com


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