Cpt.Zanzibar

i have a friend who is claiming that he is buying a Turbo ans super charger Rx-7. now first why on earth would super charge an Rx7 and second i didnt think that was possible. what do you guys think?

Sideways7

iTrader: (7)

Sure, you can supercharge an rx-7. Atkins rotary sells a kit made by camden. You don't get the top-end power boost of a turbo, but it gives a large boost in low and mid-range power.
As for a super-turbo-charged car, if thats what you are asking about, its theoretically possible, but extremely unlikely. I've only heard of one such car, and it was a Testarrosa with hundreds of thousands poured into it. I was experimenting with how to rig one up a while back, but I'm not experienced enough in how they work to design it to where it would work properly.

adrock3217

Yes, you CAN supercharge and turbocharge an engine.


I highly doubt he is buying one, though..

eriksseven

iTrader: (6)

aznpoopy

its totally possible to twincharge a car like that.

but very few people do it. therefore your friend is probably fully of ****.

RETed

Waste
Of
Time


-Ted

Jager

iTrader: (10)

Your friend is a liar and the original poster needs to spend more time on his grammar.

spot_skater

I saw a Corrado with a supercharger and a turbocharger once. On the net, too. The thing was serious.

And rotaries seem to respond better to turbocharging.

Secondmessiah

some new gti is twin blown

the supercharger gives it crazy torque down low, and the turbo rips it up in the upper range

170 hp and 170 lb-ft out of a 1.4L

osiris7442

ive seen a subaru STI super/turbo charged...god knows how they fit all that into that engine bay

tinvestor

I have to disagree with TED, if done properly it can be very beneficial. If you clutch the supercharger and have it freewheel when the turbo is at boost then you get high boost off the line and all the benefits of the turbo.

Cpt.Zanzibar

i knew he was bullshitting me i just wanted to make sure i was correct in my facts. and jager im so sorry i didnt capitalize. cuz its so card to read and all. get a life.

RETed

You're basically building a show car.
You get negligable increase in low end power - nothing a properly sized turbo would do in the first place.
The increase in complexity and cost is...
...like I said before...
...not worth it.


-Ted

tinvestor

Dont get offended I do this only in fun

Your friend is a liar, and the original poster needs to spend more time on his grammar.

I put the comma in for you. Next time you rag on someone for their grammar, please use propper punctuation.


On topic: There is a VERY SLIM possibility that your friend may be telling the truth. If he is, I want PICS!!

Cpt.Zanzibar

i want pics too but i know hes lying so dont get your hopes up.

tinvestor

AH OK when you put it that way, yes definately better places to spend your money.

Wouldnt an oversized turbo and small clutched supercharger to make up the low end be helpful under certain circumstances? Obviously we are talking about the few here because it would be very difficult to get them to work together seamlessly.

Nihilanthic

Twincharging was abandoned in the 80s for a reason. Its a waste of time.

If you want low end, get another rotor, or put in a v8, or use a twin screw supercharger. Lockup control for the clutch on the SC pulley and boost control for the turbo would be hell.

Or just turbo it, get short gears, and learn to slip the clutch. RX7s are light cars anyway!

Street_Knight

Twin turbo....one small-one big.
Lower and higher right? It's a question, I'm not sure if I'm right okay?
duh look at da purty punctuatiomon!!!

Jager

iTrader: (10)

Actually my grammar was fine. Here is another sentence for you.

Shut the **** up and don't be a smart ***.

Street_Knight

Awsome......
But yeah, shouldn't two turbos in ascending size cover it...right?

eriksseven

iTrader: (6)

Don't get offended, I do this only in fun.




Moron...

Street_Knight

Only god could stop this.

tinvestor

Sorry but I can't. Mom told me 30 years ago to find something I am good at and stick with it. It just so happens that being a smart *** is what I excel in.

liv

taken from the rules at the top of the page

I'm not like that usualy but you went a little overboard in this thread

its not a rule so don't tell him what to do just ignore it

rarson

Heh, I think that 2nd quote above could use some punctuation.

No, it was because the cars were killing people.

Tinvestor, you wouldn't need to clutch the SC. Just feed the turbo right into the supercharger. It doesn't matter what the inlet pressure to the SC is, it's still going to add X amount of boost on top of that. The only possible way inlet pressure could be greater than outlet pressure is if somehow the engine was pumping more air than the SC, in which case it wouldn't be making any boost regardless of whether or not a turbo was in the setup as well.

Since Roots (and screw-type) blowers are positive displacement, the volumetric flowrate of the blower is going to ONLY depend on speed. Fortunately, an engine is also positive displacement, and therefore it's speed (which is in direct correllation to the charger's speed) is also the factor in affecting volumetric flow rate. The fact that a turbo is feeding the charger ONLY means the mass flow rate is changed, since with the compressed air, more mass will be pumped for a given volume pumped.

I agree with Ted (and Tinvestor), while there certainly could be some benefits to the setup, it's far too much of a waste of time to be considered. Although I have seen a twin-charged 2.0L Volvo engine in a Manta, and the car was absolutely sick. It was running 10.5's in the quarter, if I remember correctly.

Actually, here is is! And don't forget to check out the videos.