Chigga1

here is the link....

when i saw this i couldnt believe it...

have fun looking at this setup

http://www.homemadeturbo.com/forum/i...d=9421;start=0

punkindrublic

twin turbo with nos.... one hell of a motor

Mr. Death

The bottom would have to be bulletproof to hande all of that boost....don't think so.

punkindrublic

they have lots of twin turbo'd honda drag motors.... building a bulletproof honda isn't all that hard with money anyways

Cynikal.Mindset

its only runing 8psi combined...so its really just to show that it can be done, also the nitrous isnt armed so all it is running off is the boost which is low anyways

the colours are ugly but hey he has a TT Civic!

Brett

what is the point of all that work to only run 8 psi? I was expecting that beast to be running 20-30 or similar numbers

Cynikal.Mindset

to prove people wrong...and he said when he builds the motor he's gonna bump it

imported_gatherer

well pressure isn't the only thing you have to worry about with a boosted system .... there is also something called cubic feet per minute.. or CFM look at an air compressors ratings it's all there adding a second turbo should (in thoery) double the CFM delivered to the engine.....

Nova_Dust

Ya, that guy has the skills.

DirtyLude

Unfortunately CFM really has nothing to do with this. Two equal size turbos gives no advantages over a single large turbo. If he did it just cuz he wants to and to see if he can do it, that's great, but it's not going to give any extra power.

imported_kane2k

The reason you put 2 equal sized turbos is to reach a desired CFM but instead of doing it with a single large turbo, you can do it with two smaller turbos which will spool much quicker than the large turbo. So yeah there is an advantage but it doesn't show in your max hp figures. Twin turbo makes for a better driving car.

DirtyLude

No, that's completely wrong. You have two small turbo's but each receives on;y half the exhaust gasses. Also with the increased thermal mass of the two turbos you lose energy. On a small 4 cylinder engine a twin turbo gives no benefit.

What I assume you are thinking of is sequential twin turbo whith a smaller turbo for spool up and larger for top end.

Still, he gets top marks for experimentation. I can't say anything about his crazy *** welding work, my manifold looks like crap as well.

imported_kane2k

No I mean that for a given pressure surface area 2 turbos with a lower blade diameter will be easier to spin than 1 larger turbo using the same amount of exhaust gas. Spooling involves building angular momentum for the turbine. Decrease the distance from hub to the centre of mass of the turbine by half and you decrease the energy required to spin it by four. Since the turbo is smaller the blades require less reinforcement and thus there could also be less spinning metal as well. So take two well designed small turbos and they can spool quicker and provide the same amount of boost as one larger one.

Also what you are talking about with two different sized turbos is a biturbo system. Granted a twin turbo setup makes more sense when you have two exhaust manifolds but if you pick the right turbos and are running them at their optimum efficiency points then a twin can work properly with just one manifold.

DirtyLude

The increase in moment of inertia on a larger turbine/compression wheel is small. The wheels outside of the hub are the lightest part of the rotating assembly. There's also frictional advantages to a larger wheel. Two shafts with half the diameter have more surface area and more drag than one larger shaft. It would be easier to get better spool up by increasing the manifold efficiency, but you are right two turbos would give a neglegible spool up advantage at the expense of power.

What I am talking about with two different sized turbos is called sequential turbo. I've never even heard of BiTurbo. I did a google search just to see if it's another term for sequential turbo that I've missed out on, but all I got was Maserati Biturbo, which is a car.