Subscribing!

 

i have been talking with a guy that has done it before and everything i have read so far says it does not just add, but times. it does make sence it would times also. the blower doesn't care or know it is seeing 5psi it is intaking, it will try to take whatever pressure is there and compress it in a ratio of 5 to 1. (if the s/c is running at 5psi) the only way it wouldn't is if the s/c was not effiecient or leaking past the rotors. i do not expect it to be a perfect conversion, but it will be close to that.

 

Can the stillen unit actually flow as much as as you are considering here. You have to think about the amount of air needed to be compressed by this unit ... highly unlikely.

 

i have seen a write up of a mini cooper s with the stock blower plus a turbo kit. it made pretty good power. if you want to check it out, I think it was SCC almost a year ago. It can be done, but they said it was rather difficult to set it up properly.

 

Lets not knock him down, he´s trying something that were all curious about. If it works, great. If not, then he needs to get a bigger supercharger!!

 

What if....

You plumbed the outlet of a centrifugal supercharger into the inlets of the turbos, then sent all of that compressed air to the engine? You may not have that insane torque down low, but the mid and high end would be insane.

Just something I thought of a while back but never asked, so I figure a twincharging thread would be an appropriate place.

 

as posted earlier, the flow of the stillen on it's own isn't so much a factor anymore. it is being fed compressed air and will compress more. which means the manifold will be getting that much more compressed air.

 

no need to worry, i will do it no matter what people say, lol. and yes, if there is a problem with the stillen s/c and airflow, i have a 350 c.i. blower in my shop just sitting, hahaha. hard to see over it though driving and i want to do some auto crossing this year, so i chose the stillen.

 

Scott,

You may want to add a 200 wet shot of NOS to top that all off.

Seriously I am very eager to see what the results of this will be. Good luck man.


John

 

So lets say you do run the stillen at 5 psi by its self, its taking 14.7 psi(amibent pressure) compressing it and putting it into the motor 19.7 psi. (all in absolute pressure btw) so whats that 19.7/14.7? which is some ratio im too lazy to calculate, but in terms of just saying and mindless ranting its a 1.3:1 pressure ratio. With the turbos running the same 5 psi which is the same pressure ratio as the stillen by themselves, it will throw out into the motor 25.61 psi but in reality just about 11 psi of boost.

From looking at it, wouldn't it be more beneficial to run the turbos at 7 psi as well as the stillen at 7psi? Having 15psi forced into the motor seems pretty safe on your engine setup and seemingly not running either form of compressor extraordinarily hard.

 

in all honesty, i hope your right, as what could be a normal boost spike could lead to a huge boost increase and boom! right now i am going to trust the guys that have done this before. rick dobbertin is the one i have been getting my info from, and he has done 2 of these projects and won the world of wheels with those same 2 cars in different years. thus he built that earth rover thing a few years back that was the big milk tanker turned amphibious 6 axle monster. plus the hp books "turbochargers" references multiple boosting in there. all these guys say it will times.
as i said i hope you are right, as with my starting point i will be pushing 25psi. if your case is right, i will have plenty of room to go alot higher to still meet my goals.

 

Wait 25 psi? If my calculations are right and the truth about twin charging are correct (that mutiplication of compressors is incorrect, but rather a ratio of a set amount of absolute pressure is mutiplied by a certain boost increase ratio and mutiplied again by the secondary compressor ratio) you will have to run both the stillen and the turbos at a much higher rate then you would have like to. Theres a bunch of other factors to look into but pretty much the concept SHOULD be the same.

If you are looking for 25 psi (boost)into the motor, 8 psi on the stillen seems to be rather safe for the unit. If thats the case, you would need at least 11 psi from the turbos to create the desired 25 psi or at least around there.

 

believe me, these are the questions i have asked and thought it would be about the route you are trying to head. but in fact i have heard otherwise, again from people that have done it. who knows, you might have hit the nail on the head, but in diesel tractor pulling, how are these guys hitting 300psi into the intake with 3 consecutive turbos. 3 @ 100psi each? don't think so.

not trying to argue, but i have set my game plan to what i have heard. better to start somewhat safe and have alot of room to push farther if you are correct.

 

Oh never thought it was an arguement but more as a question of the real equation of compound charging. I have far to much respect for the work you do to start an argument about something that has never been tried before on a Z.

If anything im glad someone is trying this already as i have thought about doing the same setup months back but held by a lack of money but more of a lack of Z, HAH. Just for ****s and giggles i plugged in on how much psi it would take to create 300 psi and with the equations i've been using it would take each turbo about 26-28 psi to create such boost. But again im not too sure on how valid my information is so all my numbers i've been using could be as useful as a sack of crap.

Again i have too much respect for you and the work that you do to wonder whos correct in the manner. All i care about is that you get it up and running, and when your 2.5in exhuast is going to be released.

 

Well for the Good news - It has been reported that with the Stillen SC - the 350Z will still continue to run with the belt disconnected. Unlike the Roots Superchargers of the Previous decades. 60's 70's and 80's .002 - .003 Inch clearance. Belt would break, engine would abruptly stop.

This is the first clue... No Charge.

I have no doubt you can do the plumbing in a very clean manner.

I'm not sure what 12Psi of turbo boost combined with a 5.5psi of roots SC would produce. But the car should continue to run.

A more interesting configuration would be twin turbos, feeding a third Single turbo before the plenum. ( TT to a TN and of course dual FMIC's )

Ha ! Now you won't get any sleep...

Cheers Amy -

 

So ahh... when will the 3.5 inch exhaust come out for all that airflow? lol

 

thanks for the compliments. only time will tell what this thing will do. trying to decide to pull the motor apart first and do all the strengthening stuff i want to do, or just do the blower first. the block would be the best thing to do first, but like my name says, overZealous1, lol

 

ahh yes, i have decided to point them out of some holes cut in the hood, like tractor pulling, lol. not sure if you can get dual 3.5" out the back of the car without building a custom sway bar.

 

bummer news amy, i was hoping the lobes were like the old roots style. they would hold the boost better. hmmm, i need to take a look inside the stillen s/c. anybody remember who makes that s/c? magnusson i thought.

 

Totally bumping a 6 year old thread..lol. I just came across this, pretty funny.

Any OG's around know what ever came about this?