Supercharger upgrade for 4AGE--> eaton M90

[oldcorollas]

well both times he seized the blower was when he was cruising on the highway, which would pretty much suggests that it was an inadequite bypass which caused it, due to the spinning sc at that speed in a sence choking on its own air.

thats possible... i remember reading all his threads back when it happened, and he'd gotten a replacement from whipple because they had forgotten to tell him that the SC had to remain horizontal, but initially they had said it was fine to mount vertically, and that led to the problem? hmmmm
i can't seem to find the forum he posted the info on way back...

did you see those threads?

[pjaw11sc]

I'm pretty sure that in the later posts he rules that out as a possibility..

[oldcorollas]

I'm pretty sure that in the later posts he rules that out as a possibility..

oh

can you remember where those pages are? i couldn't find them would be nice to read them again tho

if you can find em, could you post a link?

[nick.parker]

Originally Posted by pjaw11sc
well both times he seized the blower was when he was cruising on the highway

That is in line with what I heard from a contact I have who works at Sprintex.

Regarding the mounting plate flatness, I have some information on the installation of Autorotor superchargers, quote:- "The base plate or bracket _must be_ machined flat within 0.05mm. If not there is risk for distortion of the casing causing failure."

I left a message with a guy I know at Sprintex enquiring about what bypass they use for various appliactions so I can let you know what is suitable when he gets back to me.

Edit: He just called me, said they use the Magnusson on some quite large blowers (3.5L V6 supercharged..) so it should be fine.

Regards, Nick.

[pjaw11sc]

Oldcorollas, if you go on the mr2oc site and search for "twinscrew" in the mk1 section they are all there, they are the posts by 'upspro'
Oh, and also there are two other guys on that forum running twinscrew sc's and i would have thought that if the side mounting was a problem they wouldn't be running them. (not being rude to you at all, you were freaking me out saying that it wouldnt work!)

Nick.Parker, by 'mounting plate' you are referring to what would be holding the sc in place right? If you look at the pic i posted up near the top, the 'mounting bracket' that i have is the hollow rectangle part on the right.
That would be cool to get official info on what bypass i would need, maybe you could get a price on it too?

[oldcorollas]

no worries, thanks heaps!!
http://www.mr2oc.com/showthread.php?t=88401
yah, this was one of the last threads i read on it.. and it was a year ago... so it looks like i have more homework to do

didn't mean to scare you, just hoping that you had seen and read about it first (cos i would hate to see it happen again ), but if you know, and thats not the prob.,...all good

thanks heaps for the links and ref.
Cya, Stewart

[pjaw11sc]

its all good,

[inertia]

Well,

I'm certainly interested in these upgrade paths.

I thought i'd refer you guys over (cartman voice) nyarr: http://www.twincam.org/forums/index.php?showtopic=17607

mr2swift has been kind enough to post his results with a twinscrew on twincam.org and the thread is turning into a psuedo "kit development information" thread.

[oldcorollas]

yar he's on MR2OC also...

[menace]

try checking out this thread from Twincam...

there is a member named "bsee" that was working on a centrifugal kit for the 4a engines...

http://www.twincam.org/forums/index....opic=13680&hl=

This kit looks promising...

[pjaw11sc]

why would you want to go for a centrifugal sc? they have the lag af a turbo and are belt driven by the engine like an sc, where are the gains? Are they super easy to install and set up or something?

[oldcorollas]

they take up a little less space than SC, but have all the same plumbing and belts.

the benefit is being slightly more efficient at high engine rpm than a roots SC..

the MAJOR downside is that boost can ONLY increase linearly with rpm.

ie, say you want 20psi at 8000rpm..
you have 5psi at 2000, 10psi at 4000, 15psi at 6000 and finally 20psi at 8000.

actually it is not that good, boost down low comes from overdriving them.

compare this to twinscrew SC, which would have 20psi from maybe 2000rpm.-redline. i am unsure of power losses for centrifugal compressor, but i doubt they would be much less than the lysholm style (if it all)
compare to turbo, which has 20psi from maybe 5-6000rpm to relines (but less parasitic loss.. except for exhaust backpressure)

they are great for a dyno queen, since boost is dependent on RPM, and maybe make a car more driveable in terms of safety (no turbo kick, no instant SC torque... just smooth boring slowly building boost ).

they work well on big V8 dyno queens because the compressor can be very big and move a shiteload of air, without the heat and added hassle of turbo, but still has significant mech loss..

for small engine... small turbo or small SC why wait for boost ALL the time..

[ToySprinta]

Information received from Sprintex:

Hello Steve,
Thankyou for your inquiry into our product, I have done some research
into fitting one of our superchargers to your engine. The OA2087 is
defiantly the blower you want, at full revs it will make around 212kw at
the fly wheel so looking at it on the low side you could expect to make
approximately 152Kw at the wheels. I have chosen the 2087 for the reason
that a three series blower would be physically to big to under the
bonnet of your car considering the restricted engine bay in them and
obviously the fact that it makes the power that you are looking to
achieve. The fact that you have a blown motor already means that this
will not be a custom fit and should be quite a cost efficient project
for you. The OA2087 will cost you $3036.62 and the adaptor plate I would
estimate to cost you around the $750-1000 mark. I have been talking to a
client who has recommended that using a normally aspirated inlet
manifold and modifying it to fit is a great idea due the ports being
bigger. Just a bit of side info for you.

Best regards,
Ben Henry

Hmm $4000....Cost effecient huh...
Still want to try upgrading the charger though

[nick.parker]

Hi ToySprinta,
If you're talking to a guy at Sprintex they called me to ask what I did since they know of me - I have a custom SC14 setup, and I told them the na inlet manifold was the go, since you probably need to redo a lot of pipework anyway.

I think the twin-screw would be fantastic, and one day maybe I'll do that too, BUT in the meantime the SC14 setup is pretty good value - you can run 1 bar all day no reliability issues at all - that is spinning the SC14 at stock AE101GZE SC12 speed, but you get more boost :-)....I ran 18psi for 6 months with no issues also, but I decided to back it off for longevity reasons, also my 18psi pulley cracked due to un unrelated issue.

I'd say the car is pumping out _atleast_ 160ish rwhp on only 12psi, on a 'custom mix' camshaft arrangement setup now with great low, great mid and good high end too. Still on the stock exhaust too (getting 2.5" this week yay! :-) ). It depends what you want, but an SC14 is a cost effective SC - costing around $250- $400 depending on where you buy it, but don't forget re-piping the inlet can be a bit of work. and also you'll NEED aftermarket management, definitely a better clutch, bigger injectors and maybe a bigger fuel pump!

Check my website for some info on what I did.

Cheers, Nick.

[ToySprinta]

^^^ Cool, thanks for the info. Got most of the support systems ready for it, (ecu, pump etc...), Probably explains why I'm already getting 160rwhp on 10psi.
Sprinterboy's SC14 setup should be running this month, so will be interesting to see what he gets. Expecting around 200rwhp from his...
Does it still "choke" at high RPM with the sc14?