The Eaton is nice for a roots-type supercharger, but how about something with an extra screw, literally?

I've recently fallen in love with Kenne Bell's twin-screw supercharger. Jim Bell's latest mission, was to dethrone the Eaton. The Eaton is quite popular, used on the 3800 in the GTP, Thunderbird Supercoupe, SVT Lightning, 03 Cobra, and Riveria Ultra. Pretty much all of them using the Eaton M90 supercharger, where the Lightning uses the M110.

Jim recently made a new kit, that bolts up right up in place of the Eaton M90 on the 2003 Ford Mustang Cobra. Here is a little preview of the results, they tuned the Eaton before they removed it and maximum boost they got out of it was 14.3 PSI, whereas the KB got 19.8 PSI.

Jim proved that supercharger and bolt-on can go in the same sentence together, by doing nothing else other than using his kit on the 2003 Cobra. The supercharger was a direct swap. No block prepping or piston swapping was necessary nor fuel pump or injector upgrades, KB's Boost-A-Pump provided extra voltage to the pump to make up for the now extra power.

With a good air intake system and a 2.66 pulley, the KB twin-screw made 19.8 PSI from 4,000 RPM to 6,000 RPM. This also gained the Cobra an extra 200 RWHP, this was all done on a stock engine, with stock exhaust, so extra gains are there.

Rough guesses on power of a KB twin-screw on a 3.8L, about 418 BHP @ 6,000 RPM and 413 ft-lbs @ 5,000 RPM.

What do you think? Anyone have aspirations of doing a supercharger swap on a 3.8?

------------------
1985 Pontiac Fiero 2M4
Soon to become the LT-5 powered Pontiac Fiero ZR

With gains like that WTF not? Sign me up

------------------
My karma ran over your dogma!

Visit my L67 swap page

quote Originally posted by Freshj: With gains like that WTF not? Sign me up

That will be $4,000 USD please

8-20 psi kit is available in Satin Black ($3699) or Polished ($3999). Includes Kenne Bell Blowzilla 2200 Supercharger, FLOWZILLA inlet manifold, Kenne Bell SWITCH CHIP®, 30 amp BOOST-A-PUMP™, BOOST VALVE Kit, Tuning Instructions and Dyno Tests for all pulley sizes. Extra pulleys - $69 (sizes 4-1/8" (8 psi), 3-7/8" (10 psi), 3-5/8" (12 psi), 3-3/8" (14 psi), 3-1/8" (16 psi), 2-7/8" (18 psi), 2-5/8" (20 psi), 2-3/8" (22 psi). Pulley changes require part# SC3140 pulley wrench ($25). Kenne Bell Cobra Cool Air Kit highly recommended at any boost level.

A direct bolt on replacement. 30% lower air charge temp and 30% less parasitic (HP) loss than the stock Eaton. 72 more HP than Eaton at 13 psi (90 more HP with Kenne Bell Cobra "Cool Air Kit").

Available February 1, 2003.

Will they be making a kit for the L67? Or will that one fit...

quote Originally posted by Freshj: Will they be making a kit for the L67? Or will that one fit...

The supercharger itself will bolt right up, since the Cobra and L67 use the same Eaton M90. 5.0 Mustang says the dimensions of the two are practically identical. May have to do some custom work on some of the other parts, like air intake.

Yeah, so the Cobra uses an Eaton M112, the GTP uses a Eaton M90. And noway would it ever bolt right up. The snout lengths are totally different. And the most Obvious is that one motor is a ford V8 and the other is a buick V6 huge difference. Plus i think Mr. Jim Bell is way over exaggerating on those numbers, granted twin screw superchargers are more effient but they are not miricle workers.
Justin

------------------

DoH!

quote Originally posted by Sherlock: Yeah, so the Cobra uses an Eaton M112, the GTP uses a Eaton M90. And noway would it ever bolt right up. The snout lengths are totally different. And the most Obvious is that one motor is a ford V8 and the other is a buick V6 huge difference. Plus i think Mr. Jim Bell is way over exaggerating on those numbers, granted twin screw superchargers are more effient but they are not miricle workers. Justin

I could of sworn it used the M90. Actually all of the numbers were tested by Jim on his own in-house dyno, with 5.0 Mustang & Super Fords standing by, taking lots of pictures and oohing and ahhing. So the numbers are real and not too hard to believe actually. The former 4.6L SOHC that shipped with weak pistons in 98-99, was able to handle 17 PSI from an ATI ProCharger before blowing.

As for differences, I've seen the bottoms of M90s on Ebay that say from the T-bird, and another from a Buick and yet another that is just labeled as Eaton M90 supercharger, and there was not the slightest bit of difference in any of them from what I could discern.

How different are the snout lengths, is the Cobra's longer or shorter? By how much?

If it's shorter it can be overcome. I don't know the word impossible

There is alot of differences between the m90 on a gtp and the m90 on a thunderbird. For one the m90 on a gtp is custom fit to that motor, its not the standard universal eaton m90. The m90 in a gtp is a Series 3, the thunderbird i believe is not. I have no idea about the snout lengths, i believe the cobra snout is shorter but it doesnt look like it is by much. I would venture to say that it would be cheaper to just buy a twin screw blower and make your own adapter plate or have one made, to fit the GTP intake Manifold.
Justin

------------------
1996 Culass Supreme w/3800 Supercharged Series II

quote Originally posted by LT-5Fiero: Jim proved that supercharger and bolt-on can go in the same sentence together, by doing nothing else other than using his kit on the 2003 Cobra. The supercharger was a direct swap. No block prepping or piston swapping was necessary nor fuel pump or injector upgrades, KB's Boost-A-Pump provided extra voltage to the pump to make up for the now extra power.

No block prep or piston swapping by throwing a different brand of S/C on an engine that's already supercharged? I didn't think that was possible

On another note, I belive the 4.6 Ford uses the M90 while the 5.4 uses the M120.

quote Originally posted by Leper: No block prep or piston swapping by throwing a different brand of S/C on an engine that's already supercharged? I didn't think that was possible

Well considering he swapped a different brand and type of supercharger onto the engine, and added over 10 PSI of extra boost to the stock block.

Yeah i have no proof, i have looked for an hour, but from the looks of it the supercharger on the cobra, is just to big, its much longer, so it has to be a M112.
ohh and to lt-5's post, twin screws are so much more efficent, it is very well possible to run more boost psi because of the cooler air outlet temps.
oohh and one more thing the only 4.6l with an M90 was the roush mustang.
Justin

------------------
1996 Culass Supreme w/3800 Supercharged Series II

[This message has been edited by Sherlock (edited 01-15-2003).]

[This message has been edited by Sherlock (edited 01-15-2003).]

The Cobra makes 390 HP, the GTP makes 240. Think about the difference in airflow. No way the Cobra uses an M90. The snout having a different length isn't much of an issue. Snouts are available in a huge array of lengths.

It doesn't matter if the charger is going on a Ford V8, a GM V6 or a Mercedes V12, whether or not it fits is just a matter of where the bolts are, how the opening is shaped, etc. If the different intake manifolds were designed around a standard charger, then obviously it would be interchangeable from one to the other.

Ok, After me going on about the cobra supercharger being an M112. I'm sorry because i believe i am wrong. I was just at the detroit autoshow, and i got to touch one lol. The supercharger looks alot smaller than i had thought it was from pictures. But, i can say for a fact the nose drive is much shorter and a GTP almost 1/2 the length. but from looking at it upclose i still dont think the KenneBell Kit will bolt up to a GTP 3800, even if the snout was the same length.
For Will The m90 on a GTP is not the standard m90, its made to fit the GTP intake, and the same goes for the cobra.
Sorry about that.
Justin
Pics

------------------
1996 Culass Supreme w/3800 Supercharged Series II

[This message has been edited by Sherlock (edited 01-16-2003).]

They have atleast two m112 on gtp grandprixs, theres a kit by intense, give her a read
<a href="http://www.intense-racing.com/MP112.html">intense m112</a>

Whoops forgot to post this...but... the m112 increased the 3.8sc by 100hp and tq or along those lines(can't find the numbers no more). Your saying that with this supercharger you can increase the output of the motor by 110%(never heard o that before)? Sounds a little far fetched, would like to see some dyno tests.

[This message has been edited by headhunter (edited 01-16-2003).]