Busting the myths..Roots supercharged 3kGt with video

[casperlynn]

Ok..ok...I need to bust up some misinformation and clarify mentioned points!

I have been running a Eaton M90 sc on my 95 base for over 4 years (with the NA ECU ) and it has always ran great! The first SC was a first gen, Thunderbird with the oval inlet which is not the most efficient and was only pushing 9psi which is about the max psi a 10:1 engine can safely handle. The only difficulty I experienced was intercooling as it would kill the engine when coming to a stop. That bug was never worked out but I am sure it is because the throttle body is before the SC. This setup was dyno'd at 416 at the crank and I had an unabated top end of 152mph capable of doing a bit more but the interior pressure was trying to blow the sunroof out.

I have since, installed a new, OEM VR4 shorty (to allow for increased boost) with the same stage 3 DR heads with 99 oilers, 450cc's, alchy injection, 3.5" GM MAF translator and Mirage Corp data logger, 7 1/2" diameter crank pulley (from a 2.5 98 Avenger), 3.33" diameter SC pulley, all coverted to a 6 rib contact, and am currently swaping out the SC with a 3rd gen Eaton with the rectangular inlet, teflon coated rotors and porting (capable of pushing 18 to 20 psi). I was wise enough to refresh the trans and install a Quaiffe LSD in the process. All the power is transferred to Yokahama rubber via a Spec, 6 puck clutch.

I have not had the opportunity to dyno the current setup but all indications are, I should be pushing around 450 chp or about 375hp to the road

Due to the insane low-in torque, it is extremely advisable to install the Quaiffe (not some cheap locking insert) and replace the mounts with solids (in my case, polys which are a bit more forgiving). I have absolutely no engine rock or wheel hop, just a bit of clutch chatter which is to be expected with a racing clutch.

In summary, a 3kgt base platform is a great candidate for supercharging. The SC is self contained (no external oiling, etc.) and are pretty much maintenance free for over 100k miles. Just change the oil once a year and put on a fresh Gatorback.

Yes, it is much more expensive then going TT (and I do admire those that have done the conversion as it is a lot of work.....much more than supercharging) but it is much more reliable if built properly (NO shortcuts!). Most peeps that have experienced SC problems did not build the car correctly. Above all, it is very rewarding not "following the crowd" going with a conversion. It may not be unique but it sure is not main-stream. Set my car alongside a TT'd conversion or VR4, my setup always gets more attention.

My .08 cents.

BTW.....I will be attending the BRG so those that may be interested in the setup, please feel free to chat....see ya!

YouTube - supercharged and intercooled 95 3000gt

[shooter83]

very nice man, do you have any driving videos?

[casperlynn]

Sorry, I do not. 95% of the time I am in solo. Maybe soon.

Garrie

[2xmks]

8psi at an idle! I am jealous! Very nice set up, super clean. Yeah a driving video would be cool.

[inperfectdarkness]

nothing wrong with a roots blower.

i just happen to want 500hp at the wheels. and unless you can figure out a way to run a twin-screw--instead of the roots--i'm really not interested. i just can't get the power i'd need out of it.

and their (roots) thermal efficiency is even WORSE than turbo's.

[casperlynn]

Personally, I would not want 500whp on a street driven, daily driver........all out race car, yes. If it was exclusively a quarter mile'r all I would need to do is go with forged rods/pistons and slap a 100-150shot fogger on her.

[yetterben]

Whats up with the collapsed silicone boots? sucking that much vacuum

[casperlynn]

Yep, you are one of only a few that noticed ha! I will be changing over to hard elbows.

[Patch]

Wow! looks/sounds good. Now I wanna make one...

[casperlynn]

Originally Posted by Patch

Wow! looks/sounds good. Now I wanna make one...

Well, what is stopping you

In the next month or so, I'll have the very SC that is in the vid up for sell......you gotta start somewhere!