Ok I know this isn't rx-7 specific but I do need some help and I would have to admit there is alot of knowlegable people in the ways of turbo's here so here is the desing!
I am restricted by putting the throttle infront of the compressor inlet and the restrictor plate must be between the turbo and the throttle plates.
This is for an open wheel competition car.
Please take a look at this diagram and let me know what you guy's think.
this is a rought draft of the idea... tell me what you guy's think... good or bad... ways to improve thank you. nothing is set in stone so any and or all ideas would be great.
Thanks
Jeff

 

I don't see a huge issue with the design....only that the restrcition is before the inlet, so you would limit the amount of compressed air...forcing you to boost a decent amount to the FMIC just to fill it up(depending on size of course).

 

Yes I realize that...
That is the way the rules are so that we don't have a HUGE advantage over the others.
Anybody have any ideas to improve on the desing?
Thanks

 

anybody else?

 

Sounds like a SAE car, where are you at?

 

i like it
always have beena fan of TB before tubo setups

 

Looks like a Formula SAE car for sure. Good luck with that. Our team decided against the turbo because of the extra weight and heat, and you can still only flow a certain amount of air through the 19mm restrictor, adding the turbo is mainly for improving mid-range power, you're not going to gain much peak power.

-s-

 

Why is that?

 

the car is actually for a intervarsity open wheel car here in the praries in canada. But the rules are similar to that of Formula SAE.

 

do you have to run a 19mm restrictor plate? or can you taper the tubing down to 19mm? also, is there a certain length between the throttle body to the 19mm step, and then from the 19mm step to the turbo inlet? do the rules say you cant run an air box between the 19mm step and the turbo inlet? ive got some other ideas whe you answer these questions...

Michael

www.techtrixmotorsports.com

 

the rules do not state that it has to be a restrictor plate per say, but it does say that emmidiately after the TB must be a 19.0mm restrictor which must be before the turbine intake. it says nothing about an airbox between the restrictor and the turbine inlet.
Jeff

 

If you run an air box like this, you will have a large volume of air already past the restrictor, so spool up will be a lot quicker, and the box should let the air slow down and loose some turbulance before entering the turbo. also, can you run a single butterfly throttle body? if yes, that would be better unless the rules say it has to be unreasonably small.

Michael

www.techtrixmotorsports.com

 

/\ wont that cost peak power output as the restriction will not fill the box as fast as the turbo empties it?

 

Well, having that box will greatly reduce spool up rpm, wich will equal boost quicker, wich means more exhaust gasses, more turbo speed... the hard part is to get the turbo to accelerate quickly, when there’s low turbo speed the compressor is very inefficient, and with a small restrictor like that it takes a lot of engine rpm to make enough exhaust gas to make boost, but if you can make boost sooner, you make more exhaust sooner and for a longer period of time (much wider power band and most likely more peak power also)

Michael

www.techtrixmotorsports.com

 

I see what you are saying but the dual TB desing is for simplicity of desing, but it could be a single TB but two 30mm TB's will flow more with less turbulance than one 60mm, that is reasoning behind it... But I do like the air box I will check into it for regulations. I was worries abotu the same thing restricting spool time, but that is a good way to get arround it.
Thanks any more suggestions or questions?
Jeff

 

no BOV
vacume on the compressor side with a closed throttle makes it easier for the turbo to stay spooled up (no resistance)