Is the twin screw supercharger dead??? So many posts about that on search I want a straight answer. and what about Rebel Auto Worx's kit is that gone? **** are they gone? Answers please!!!

 

Rebel Auto Worx is still alive and kicking. No the twin screw isn't gone. They are doing a motor build project using the twin screw. But right now, the Harrop HTV1320 (TVS) is the most efficient SC for us.

 

Thank you so much man!!! and I was wondering how much horsepower does the LSJ have without forced induction?

 

No problem. And uhm...not much, I don't think anyone has done it. somewhere between 90-110hp I'd give a guess on.

 

damn i was guessing 150. more will put there 2cents in later.

 

hey whats up, the twinscrew should be considered dead. As for a supercharged setup like we spoke about before the tvs or the twincharged setup is your best bet.

 

yeah i am just learning. So the 3 ways that most people are supercharging cars today are Roots Type, Twin Screw and Centrifugal? There are other ways but they have been proven not as effective as these 3. I just want to learn all I can about superchargers.

 

makes sense buddy. The best way to go about making power on these cars however is NOT the supercharger, its a turbo .

 

I know that but I really like Superchargers they are different you dont see them everyday. I would like to see a car company dedicated to supercharged cars not just the V8's like ford does but all engines the 4 cylinders and 6 cylinders. Well those are the main 3 ways of supercharging right? I wikipediad that **** and thats what it seemed like. There was an other recent method in the late 80's early 90's known as the scrool type but it seems to be gone now.

 

what's the difference between a twin screw/TVS/good 'ol roots blowers?

i know eaton has the TVS technology in production, but they use it on the time attack balt. i don't know what it is though. clarification?

 

The TVS is the latest in Eaton roots type technology. It is designed to be more efficient then it's predesesors. People with the M62 have a hard time hitting 300whp while the TVS has some at 350 whp or 412 BHP. Check there website out the company is Eaton.

I dont know why GM did such a bad job with the LSJ engine. There are Twin Screw RSX Type S's making 450whp or 530BHP. If the stock intake manifold was better there is much more potential on our cars. = (

 

bump, who is making 412 bhp on the tvs, no one on this site. The tvs has a hard time getting over 350whp, and the m62 has a hard time getting over 280whp. This is without nitrous obviously.

 

To put is simply, the conventional Eaton/Roots-style blowers have two rotors that spin and intermesh with a slight twist to them while the Lysholm/screw-type blowers are as their name implies, almost screw-like with their rotors. The new Eaton Twin Vortices Series (TVS) takes the two Roots-style rotors and "twists" them somewhat similar in general appearance to a screw-type blower if you squint your eyes. The Gen V Eaton blowers for example have three lobes and a 60° twist while the new TVS blowers use four lobe rotors that have a 160° twist (which is also why the TVS is referred to as a "high twist" rotor design).

There's some info and pics on the different Eaton/Roots-style blowers here and some info on the Whipple's twin-screw blowers here. You'll notice that their screw-type is pretty similar to the Eaton's new TVS but there are other more traditional screw-type blowers on the market (there's a picture of an older Lysholm on Wikipedia here).

 

is ther any way to get the rotors in our SC's upgraded?

oh, and thanks a bunch blackbird, excellent post.

 

Thats 412 hp at the crank. 350 at wheels. you taught me that. Just multiply 412 by 0.15 then subtract 412 with that number and you should get 350.

 

XTC, BHP is BRAKE horespower, pretty much the same as at the wheels, i think you confused that with crank HP.

 

If you have the Gen V M62 there isn't any upgraded rotors. In other words you can't swap in TVS rotors. They use a completely different housing than the older Eatons. About the only thing you can do is some port work to help it flow a little better, but due to the basic rotor design you won't get anywhere near the efficiency of the TVS or screw-type blowers. Overspin an M62 and it will produce a lot of hot (less oxygen dense) air due to its relative inefficiency when pushed hard but if you look at some of the compressor maps for the TVS you'll notice a couple variants are approaching and even surpass some turbocharger compressor wheels.

 

#1. the gm lsj is NOT a honda engine so don't compare it to the rsx type S engine, which was designed to be a high-revving, naturally aspirated torque-less 4banger. while it is a good engine for what it is, it's got a 11:1 or something compression ratio, which is not exactly something I would ever consider for boosting. sure, rsx owners have done it, but it's generally not a good idea to boost high compression. also, the rsx generally makes its high hp numbers due to it's extremely high rev limiter, stock it's set at 8100rpm.

#2. consider the twinscrew project dead. if you're dead set on twinscrew, just fab up one yourself or just give the tvs a try. it's already out, and it's proven to make a ****-ton of power over the m62, which is what you're going for anyway.

#3. I agree with the statement on the intake manifold, but what is your hp goal for your car? several companies are looking at intake manifold projects, just give it time. GM can't do everything right

 

How can you compare the LSJ to the K20?

The K20 has a MUCH higher compression ratio, and is a more efficient engine because of it's valvetrain. It was built to run naturally aspirated, so of course it's going to make sick power with forced induction

 

The twinscrew is not dead. In fact I should be receiving my parts back soon and will have my kit back. Whether or not I just sell off the kit for cheap or continue to work with it is real question though. The Lysholm 1200AX twinscrew is more capable than the M62 is from what I've tested, but not quite up to par with the Harrop 1320TVS.

M62 = 1.0L blower
1200AX = 1.2L blower with more efficiency
1320TVS = 1.32L blower with good efficiency

The reason why the RSX reponds so well to the twinscrew is that their motor is far superior in flow than ours is, and the twinscrew they use on it is a Lysholm 1600AX which is a 1.6L blower.

 

Actually I put down 353hp and 341 lb/tq with the twinscrew and meth. I was seeing 16 psi at 2400rpms...lol
This dyno was to 6600rpms

My tuner set a conservative tune on 93 octane, with still more to go...if you get a new higher flowing intake manifold definitely can sqeeze an additional 10-35hp
To all the none believers you can make more power with this set-up just haven't had the proper working kit to do so yet.
I used a dynojet for my numbers stock and TS.
My stock was 206hp / 198 ft/lbs

 

Okay so here's the only question I don't see answered.

Will it be possible to swap our eaton m62's for the new eaton TVS? Or is it too early to tell?

Sure, Harrop has it's TVS, but now I'm curious as to how Eaton's TVS will turn out.

 

Where could I buy the TVS at and can it use the GM stage upgrades?

 

Dyno sheet/pics of car?

Very hard to believe as the TVS isn't doing it easy to make that power..

The Harrop IS the Eaton TVS.

 

Must've read everything wrong... Bleh. Twin Charge for me after the first of the year.