TriTurboGen3 RX-7

Ok i was thinking last night. COuld you set up a Turbo to where it has some kinda like small "flywheel" That is attached around the Turbo shaft. This "flywheel" would be more like a gear. (i was thinking of using a Hardend steel spur gear from an r/c car) And you would have a Electric motor from a r/c car to turn this gear (i was thinking 550 size motor might have enough torque with the right gear combo). Like while a idle you flip the switch to turn on the motor, so it could spool up the turbo instead of haveing to wait for the exhaust gasses to do it.

The whole system would be run using r/c car components, Pinion gear, spur gear, 550motor, 12 volt rechargable battery, and power switch.

Theres a few more details i need to think out, But when i get my T2, and a get a turbo kit, i may mess with this idea, on the old stock turbos.

Tell me what u guys think of this, the good the bad why its bad.

Cap'nWankel

Nope... You would have to build in some sort of a 'clutch assembly' to disengage the turbo from the electric motor once the exhaust gasses begin to do their job, otherwise a) the motor would itself put marginal lag on the turbo, but more importantly, the motor would surely fair after little time under the extreme heat of both the exhaust plumnbing, and the spinning at extremely high rpms.

Greg

EXACTLY

E6KT2

There are other forms of anti-lag other than the big-boom, extra rich backfire method. I would really look into the WRC cars and try to find something.

TriTurboGen3 RX-7

Well i could Use a Servo (once agian from a r/c car) to pull the Motor and the the swaying arm its attached to away from the turbo, once the boost is reached.

cement

i don't mean to be negative but ive read some ridiculous idea's before but this one is right up there
mate if your so worried about turbo lag its time to drive a N/A car or put a pissant turbo on and forget about topend
and before you all jump down my throat about being harsh have a rethink and go read the first post again and especially the last line

TriTurboGen3 RX-7

When Einstien first presented his idea's lots of ppl thought they were ridiculous, and i'm sure it was the same way when Felix Wankel presented his idea's. So i'll take that as a compliment

peejay

The problem is, at lower RPM the turbo might go into surge, just like when you slam the throttle shut when shifting if you don't have a blowoff valve.

TriTurboGen3 RX-7

Can u tell me why the turbo may go into surge? ( not saying i don't bealive u i do, just would like to know why this system would cause this) Also what exactly causes the turbo to go into surge? is it when there is to much air pressure is put on the turbo?

peejay

Without going into a major essay on how turbine-style compressors work, compressor surge is when the turbo is trying to compress air at insufficient airflow levels. The airflow becomes unstable as the compression alternately stalls and re-starts. This is what causes the "warbling" sound when people left off the throttle without a blowoff valve, or with a too-small/too-stiff blowoff valve.

Turbos have to be moving a given amount of air at a given turbo shaft RPM before they can start compressing the air in a smooth and seamless manner. This is specific to each compressor wheel and housing. On a compressor map, the line at the upper/left side of the topographic map is the surge line - for that given pressure ratio, that is the minimum CFM you need to be flowing.

This is why we can't just take a huge compressor and put a tiny turbine housing on it and expect to make 20psi boost just off-idle

KraftDinner

Garrett designed a turbo with a built in electric motor to combat turbo lag.

rpm_pwr

from memory if fell flat though. It had a complicated built in clutch and didnt reduce spool times that much

-pete

KevinK2

http://www.turbodyne.com/product2.html

turbodyne tried to liscense this concept to Garrett, who apparently bailed out.

TriTurboGen3 RX-7

God damnit ! **** me ! evrery ****** idea i come with has already been done.

Excuse the tpying, i have a lil to drink toniewt

E6KT2

So VATN is still the most viable option? Why or why not?

Node

iTrader: (1)

VATN is a good idea. But VATN is unreliable. Well at least the VATN brand itself. There are other brands using similar technology, that may be more reliable. But from most I have seen VATN's **** out rather often. Or used to.
I know Garrett makes one, Aerodyne makes "the" VATN

Node

iTrader: (1)

https://www.rx7club.com/forum/search...der=descending
And check out the thread I started. It has some good info in it.

David88vert

It's simple. Put a small wet N2O shot (50) on with a MSD window switch that kicks the N2O on at 3000rpm and off at 5000rpm. It's commonly used in drag racing this way.

KraftDinner

Are you sure? I found out about it from a Garrett advertisement in a Sport Compact Car magazine a while ago (2 years?)