About a month ago I decided to start the process of supercharging my 2004 Limited Crossfire. This decision was made after about 6 months of lurking on the website and not finding any concrete information on the subject. Theree have been lots of threads on the subject that have ended with no results. Which brings me to my first goal. That goal is to definitively find out what really happens when adding a supercharger to the MB NA 3.2. I have no intention to make and sell kits, I just want to make my Crossfire a little faster and enjoy fabricating and installing my own custom parts. As this is a forum I will happily share my findings with all of you. To keep this thread on track and keep non essential information to a minimum I would appreciate all questions and general comments to be directed to me through PM's. Even if this project becomes a failure I will post my results that we may all learn from the experience.

My main goal is to make a working prototype at the very least cost. So, my hand made parts probably won't look pretty. It is function over form for me.

The parts I will be adding are as follows:
1 Eaton M90 twisted roots style blower
2 BLOX FMU
3 21#/hr fuel injectors
4 Methanol/water injection
5 Fabricated intake manifolds
6 bypass valve
7 CAI
8 possibly piggyback computers for tuning issues

Through out the process I will try to retain as many factory components as I can.

I started the process in this order.

Disconnected negative terminal on battery
Removed engine cover
Removed all vaccuum lines and air pump
Unplugged all wiring harness connectors
Removed fuel injector rail and injectors
Removed maf and than throttle body
Removed intake manifold.
I than cut off the "horn" that the air pump bolts to with a sawzall.

This got me to the point of positioning the supercharger.

I'll post more a little later today with pics.

 

Wow! A lot can happen in a day. I got hit with a solid week of work. Not to mention my ups tracking # is showing my tubing for the intake manifolds isn't scheduled to arrive until Monday. But anyway, My next task was to align the supercharger with the serpentine belt. I used 1x1 steel 12ga tubing to make my mounts for the supercharger. Grade 8 threaded rod was then welded to the mounts to allow easy removal of the supercharger and adjustment. I'll go into more detail and take some pics of this when I remove it to change the gear fluid. You are going to have to wait for pics to fully understand how it is mounted. I have loaded a couple pics onto my user gallery. I'll try to take more tomorrow.

 

All my parts have been ordered and are now on their way to me. I went with a cooling mist methanol injection system, bosch high impedance injectors, 19# at 43.5psi about 21 at our higher fuel pressure, and a BLOX 12:1 FMU. I'll release the part number for the injectors after I make sure they work with the fuel rail. I'm also going to relocate the fuel pressure regulator under the hood and run a return line back to the tank. That way I can mount the fmu in the engine bay as well, closer to the intake to make sure its not slow to respond to boost. Installing a manual boost controller in line to the FMU will also turn it into an adjustable FMU. It works by creating a controlled leak in the boost line. The larger the leak the less clamp pressure inside the fmu and consequentially lower fuel pressure.This controlled leak is routed back into the intake post maf pre supercharger. I plan on using the wiper fluid reservoir for the meth injection. Tons of small things to work out on a conversion like this.

 

Here is the link for making a FMU fully adjustable
http://www.superchargerhelp.com/showthread.php?t=2131

 

Eaton M90 Twisted Roots Blower Graphs attached.

 

For those who didn't see this in my other thread
The equation below will calculate pulley ratio for roots type blowers.
(14.7 + boost / 14.7) x (engine volume/2) / supercharger volume =pulley ratio

So if I want 8psi of boost.......

14.7+8/14.7 x 3.2/2 / 1.5 liters for my M90
1.54 x 1.6 / 1.5 = 1.642:1
So i need a pulley that will turn 1.642 times for every 1 crankshaft turn
Keep in mind that this is assuming that the supercharger is going to work at 100% efficiency, which in reality it is about 80% efficient. I should get about 6.4 psi of boost which should be safe and near the superchargers lowest output temperature. This should also equate to about 1.43x more power. 215x1.43=307.45HP 230x1.43=329 TQ
These are rough estimates but should be feasible.

Also my final drive ratio turned out to be 1.71:1 . I should see between 7 and 9 #'s of boost.

 

wow, this may be cheaper than the tvt-250 upgrade.
I'm guessing you'll make 275hp. but it's still cheap power

What will be the supercharger speed at 7000 rpm's?

 

Eaton M90? I think that's what my old car had. Cool.
Then:

And Now:



Good luck with the project. I look forward to seeing the results.

 

Doesn't that supercharger need an intake manifold adapter and a charge cooler?

 

Here is a great link with everything you ever wanted to know and more about liquid intercooling.
http://forums.nasioc.com/forums/showthread.php?t=937176

 

7000x1.7=11,900rpm, My engine will never see 7000 rpms .

 

Good luck on the project! I'm looking forward to keeping tabs on the progress!

 

inmotion can remove the speed govorner, also tvt can do this too I'm guessing

that would make 500cfm, at 180F and about 40hp at around 11,9k rpm, sounds fun!

found some specs and rebuild part numbers for the m90.
http://thunderbirdinfo.blogspot.com/...build-and.html

porting mods for the eaton sc.
http://www.sccoa.com/articles/blowerbuild.php


12.88 second Thiunderbird SC mods as follows, but it is a heavy **** car too...
Modifications:
2.2 Liter Kenne-Belle (Autorotor AB) Blower
'03 Cobra Intake
90MM Lightning MAF
Accufab 1600 CFM Billet Throttle-Body
K&N Conical Filter
APTEN Laminova Triple-Core Liquid IC
Lightning Heat Exchanger
Lightning Intercooler Pump
Moroso Cool-Can
Wise Racing Engines Shortblock
Ross Racing Pistons
Total-Seal Plasma Piston Rings
Eagle 351W Rods
Polished & Balanced Crank
Multi-Layer Steel/Ceramic Head Gaskets
APTEN Custom-Bypass
Aeromotive AFPR
Steigemeier Ported & Polished Heads
Steigemeier Custom-Ported Intake
Oversized Intake & Exhaust Valves
Custom Blower Inlet-Plenum
Alcohol-Injection
CMRE Custom Cam
CMRE Chromoly Pushrods
CMRE Bronze Valve Guides
CMRE 1.73 Rocker Arms
ARP Studs & Bolts
ESM Billet Aluminum Jackshaft-Pulley
ESM Custom Fuel System Including Braided Stainless-Steel Lines
ESM Billet 5/16" Fuel-Rail Connector
Twin 255LPH Holley Fuel-Pumps
42LB Fuel-Injectors
ASP Underdrive Pullies
Trunk Mounted Battery
Griffin Lightweight Aluminum Racing Radiator
Magnacor 8.5MM Wires
Kooks 1 7/8" Stainless-Steel Headers w/ 3" Collectors
SCP "Big-Dawg" Exhaust System w/ Borla Resonator
180-Degree Thermostat
Tuning By APTEN Technologies

 

I'll be happy if I make it into the 13's. The porting I have been debating about, but its cheap and should make some worthwhile gains. I think I've seen that tbird on youtube. I've spent just under $600 on this project so far. Maybe it won't go too much more than $1000. Its usually the little things that add up.

 

Anychance we (forum members) can all get together to chip in and find a pattern maker, who can cast us a manifold adapter plate for the m90 sc?

I guess I can throw $250 for such a part, anyone know a good foundry?

Imagine if we get 10-20 people in on this that would be $2500-$5000 for a limited number of parts

 

I'm sure most people on the forum will want to see results first. Never worked with a foundry before but I'm thinking it will cost more to produce a quality part than $5000. You may want to look into sheet metal intakes. I should have tubing for mine tomorrow.

 

Wow, Cool project. I am subscribed!

 

I started porting the supercharger case today. I expanded the outlet about 1/4" . Took about 45 minustes with the dremel. I'm still working on the inlet its going to take about two+ hours because there is a lot more material to remove. Also my tubing came a few minutes ago so I'm going to work on the intakes now!

 

which version m90 is this? I think the higher flowing models came from the 94 Thunderbirs SC, I think it has a square opening on the end, vs the older model which was more oval shaped . also they say the last years of the thunderbird sc had tighter wall clearance due to a thick epoxy coating on the rotating parts and housing.

looking forward to the manifold pictures!

 

This one is the oval port . But its not like I can really run a lot of boost anyway. The manifolds are so simple you are gonna laugh. I'm planning on trying a light epoxy coating on the lobe tips since that is where they seal. I'm also polishing the internals and going to run my methanol/water injection through the SC. This reportedly increases efficiency and cools the supercharger and is recommended on many sites including the site I bought my kit from.