aimfabrication

has anyone ever done/ thought about taking the supercharger off of a mk1 mr2 and rigging it up to a 13b?

SirCygnus

iTrader: (1)

heh. you assume a 1.8 liter engine breathes the same as a 2.6 liter engine. lol

K-Tune

iTrader: (26)

it's actually a 1.6 liter motor in the mr-2...and it only makes around 150hp with that supercharger.


you'd need 3 or 4 of those little things.

Derekcat

iTrader: (8)

That would be hilarious!

And for the OP: http://www.CamdenSuperChargers.com/
If you really want to..

aimfabrication

well im trying to figure out an way to make my car more fun (torquier/faster) that is soft on my wallet....any opinions then?

aimfabrication

oh and that supercharger is sick but...to much mula for me...

canonize-ryda

port it

JustJeff

iTrader: (13)

torquier and soft on wallet don't go hand in hand

Derekcat

iTrader: (8)

http://www.racingbeat.com/RX7-1986-1...sts/16420.html
Felt a little bit torquier to me [I had RB header/presilencer and a good condition stock catback, switched to this]
Usually this catback goes for ~$300 used. [If you can find one]

I'm not sure about torque, but I was told by an older guy who races FBs with his son, that a light flywheel will make a big difference in how the car feels.

..Other than those - get suspension and go fast around the corners ^_-

Evil Aviator

Well, porting is cheap, but it decreases low-end torque in order to increase high-end torque. If you want to maintain low-end torque and see an incease in high-end torque for a low price:

A. Sell your car and buy a Turbo II.
B. Assuming they are still available after the disaster, a J-Spec engine conversion is the next cheapest way to make more torque.

Contrary to popular belief:
- Turbos make torque.
- Turbos are a type of supercharger ("turbo" is short for the word "turbosupercharger").
- Belt-driven superchargers tend to be rather complicated and expensive.

A light flywheel will make the car feel like it has less torque on a standing start.

tuscanidream

iTrader: (6)

There has been an FC for sale on craigslist in my area for years. It is an unfinished supercharger project. No idea what happened, but he didn't finish it and no one will buy it. And he is selling it cheap. While I don't know the details, supercharging may not be the way to go.

As stated before, best bang for buck would be a T2 swap. Or stay na and port with exhaust, flywheel and tuning.

If I had an na, I'd go carb and clean up the rats nests. Don't be hatin. I love carbs. All 4 of them seem to work excellent on my ninja!

Syritis

iTrader: (2)

you might wanna look into this thread
https://www.rx7club.com/1st-generation-specific-1979-1985-18/camden-dyno-pull-924013/

blackrotary23

you can do what i did. but not make the same mistakes, lol.

i took a stock n/a block and ported the lower intake of a TII to match the ports on my 6 port motor and pretty much transferred all TII parts into my car......i mean everything. i used a chipped ecu with an added 40 hp and cranked the boost up to 16 lbs with a manual boost controller. just make sure you use the correct TII wire harness for your series car (s4/s5).

aaron cake has a great tutorial about how to do this without using TII parts:

http://aaroncake.net/RX-7/projecttina/index.html

-Crash-

Karack is fabbing up a mount for an Eaton M90, thread is in the 2nd gen forum somewhere.

Syritis

iTrader: (2)

it's in the fabrication forum

here
https://www.rx7club.com/fabrication-250/13b-supercharger-manifold-934766/

Derekcat

iTrader: (8)

>_< Sorry, brain fail... Somehow I forgot about that..
Indeed, it will feel less torque-ie off the line.. What I was thinking was that it might feel more torque-ie after it was rolling - is that correct?

BurritoBut

Friend of mine has a blown supercharged s4 turbo motor in a rx4.
I think there are videos online, it's green and the number plate from memory is DABUZZ.

Syritis

iTrader: (2)

if i was given the choice, turbo or S/C for daily driving i'd hands down pick the S/C, for peak HP or track use i'd stay with a turbo.

S/C power band are linear
turbo power bands are exponential.

Evil Aviator

It depends on the situation. A flywheel soaks up energy when the engine is accelerating, and then discharges that energy when the engine decelerates. With a "light" flywheel, those who usually accelerate from a stop by simply mashing on the gas pedal will feel the engine (and car) accelerate quicker, but the effect usually feels more like additional horsepower than it does like more torque. Those who usually accelerate from a stop by revving up the engine in neutral and popping the clutch will not feel the "light" flywheel transfer nearly as much energy as a "heavy" flywheel, and the engine will feel like it has less torque.

* I use the term "light" and "heavy" in quotes because it is actually the inertia that affects the feel of the flywheel. The inertia is affected by both the static weight and the weight distribution, so with the proper design it is actually possible to have a heavier flywheel with less inertia than a lighter flywheel. Therefore, the flywheel terms of "light" and "heavy" are actually misnomers.

Turbosupercharger and centrifugal supercharger power bands tend to be more exponential. A typical Roots power band is fairly linear until it runs out of steam and drops off near redline. A Lysholm (twin screw) power band is usually pretty linear across the board.

Syritis

iTrader: (2)

yes there are small differences between the S/Cs but their boost gains are based on rpm and rpm rises at a liner rate.
turbo's boost gains are based on CFM. for each CFM burned they move ~1.7x more CFM.

RotaryEvolution

iTrader: (30)

still waiting for time to permit me to start the fabrication process, i have all the parts ordered for the eaton rebuild.

the M90 is commonly found on ford thunderbird supercoupes which is a 3.8L V6 and should be appropriately sized to make slightly over 200WHP with the proper fuel modifications. but i'm going a step further and keeping the 550WHP capable turbo on the car which is where it may start getting a little hazey as to what to expect from just tossing on the supercharger by itself.

the example should be good for people who want to attempt it though, as those superchargers aren't too difficult to find or very expensive.

it requires a standalone EMS and at least a turbo fuel system to start with, which is where the expenses really come in.

here is the build thread for those who are interested in following it, updates will be a little slow for the next month or 2 though while i work on the 6 or so rebuilds i have in the shop.
https://www.rx7club.com/showthread.p...t=twin+charged

Evil Aviator

There is a BIG difference when it comes to the centrifugal supercharger. Its boost level is based on the square of its input shaft speed, which means that its boost rises very slowly (slower than a typical turbocharger), and it will not produce max boost until the engine hits redline. I just wanted to make this clear because many people don't understand this, and are very disappointed when the results do not live up to their expectations.

Turbos work on mass airflow (lbs/min) as opposed to volume airflow (cfm). The old compressor maps that used cfm were dumbed-down for the hotrodders of yesteryear who had a very limited engineering education and were accustomed to the carb cfm ratings.

BurritoBut

My friends rx4
http://www.youtube.com/watch?v=0Lh4gLA4JW0