supercharger on a supra
 

anyoen know of anyone thats supercharged a 7m motor? i think that would be a cool project loo...noone else has one of those. The vortech superchargers can produce quite a bit of boost....and then you dont need all the exhaust work and blow off valves etc associated with a turbo.

I perosonally have never seen a supercharged Supra. If you supercharge you will still need to upgrade your exhaust to get the most from that setup. A blow-off valve is still recommended with a supercharger and you might even have to upgrade the injectors as well. Adding a custom supercharger may seem simple but there is a lot involved in order to get the most from it as well as even getting it to run properly.

ive thought about boosting my NA this way. be pretty sweet i think. lil bump of power to a pretty powerful engine. would prob skip a ic to keep it simple, it is just a daily driver. ya just like a turbo, more air means more fuel so upgrading that wouldnt hurt any.

Doing a SC is the samething as doing a Turbo its just driven by the engine instead of the exhaust. If you are boosting and engine and shoving that air in there and cant get it out then where is it gonna go? I supercharged an Iroc and It has stock exhaust with flowmaster muffler and we were craming all that air in the engine and it wasnt coming out so it found somewhere else to go....the dipstick....blew it out with lots of oil.

cool turned the motor into a weapon, its like james bond or something

i meant like....4 or 5 psi of boost. i dont think they can make much more than that, not from what ive seen anyway. instead of running a turbo, even if that s 4 or 5 psi, you still need to do all the piping work and oil returns and such. supercharger is just a bolt on item for keeping it low like that. no new manifolds or anything. i have another question thou. how do all of your vaccum accesories work with any kind of boost? like power brakes and all that. i know you could just put them infront of the boost adder but i never see anything like that included in the kits...

Here are some replies I got from a Honda forum I visit when I inquired about effects of boost on vacuum lines. (Yes, I own a Civic too)

"The stock brake booster has a one-way valve in the line so it won't see any boost.

The fuel pressure regulator works fine for boost and continues it's 1:1 pressure rise.

Evap purge is only actuated at certain times which I assume is somewhere in vacuum and low throttle.

The map sensor also can work as long as the voltage output is limited to keep the ecu happy (like in the hack or using a missing link). It's usable to around 11psi. cruise control. i just know that it still works. It's weird when you fall asleep and the bov wakes you up at the top of a hill....i bet."

"The brake booster has a bit of a reservoir for vacuum. Ever notice when you remove the booster line it sucks air in for a few seconds."

"Yeah, it is designed as a saftey feature to give you one.. maybe two good pumps before your brake assits runs out. It is for "emergency" use if the motor dies while driving."

lol well that makes snese i guess. i knew it worked just didnt know why. my friend has a grand national and the intake looks like a regular v6 intake and everything. thats when that popped into my head. hes also running this car at almost 450 horsepower(12.5s 1/4 mile) and all his vaccum accesories still work.

Thats funny
 

Ha ha thats funny.Someone else here talked about this very same thing although I never seen it myself.I wonder . . .

I have an 86.5 i was thinking about putting a centrifical supercharger for a mustang 5.0 on does anyone know if it might work ? I know that Ill have to go with bigger fuel injector and a walbro fuel pump not sure about anything else ? I have milled 25 thousands off my head and I already have headers

to anybody that think a supercharger is the pretty good at boosting
your wrong

i saw a research between superchargers and turbos
and turbo won by a mile
the psi diffrence from 8 - 10
even the dependability not even close
so i wouldnt waste my money trying to customize and inferior system for my car

pple might say it will be cheaper it will be less trouble
so what? whats the point of spending money customizing a bunch of things for your and it cant even show what your car is really made of
or tap the hidden power of your engine

the 550cc stock injectors should be fine... i wouldnt change them unless u really have to... just because its more $ outta your pocket for probably nothing atall, maybe more fuel loss thats aka lil boost but prob not worth it in the end.

one of my auto buddies is in the process of putting a supercharger and a turbo in his camaro ... ill let ya'll know how that works out... cuz im still clueless on the idea

This is an old post haha.....Supran2r, You were probably reading about centrifugal superchargers. They do suck on paper, and reliability, But you have to ride in a car with one :). Thatll change your mind. The reason they suck is because it is basically a turbo, Designed to spin at a certain RPM which is reach fast by the turbo and then kept by the wastegate. The cent. style has to run at the speed of the motor, So it is only at its peak efficiency for a short time unlike a turbo. But this is very very fun ;) haha. But anyway, I was thinking of using a roots style blower. Like the eaton m61 from a clk230/lots of other cars, Or the eaton ones that came on the SC 3.8 v6s in buicks and pontiacs. On the already pretty powerful 7m motor, It would probably mnake about 290-300 hp. Anywhere from about 1900 rpms and up. Roots style blowers make power from idle all the way up, They just have limited ammounts of boost at high rpms. Look at top fuel dragsters. They make 8000 hp with roots style blowers on 1000 ish cubic inch motors. Tell your SC vs turbo article to eat that. lol. Thats 16.6 liters... thats like 480 hp per liter. They also run 4 sec quater miles and go 320 mph with one gear and a gokart style clutch(a really big one).

i have been in somewhat a lot of cars with sc's
a 93 mustang
92 buick
89 camaro
theyre fast im not arguing that
but on the high-end side of power
its not even close
a lot of pple will disagree
but i want a 10 second car and a supercharger cant give me that

the stock 86.5 fuel injector size is 550cc?? i have heard that they were 295cc I think that a custom supercharger on a supra is alot better then just dropping in a 7mgte. Theres nothing better then doing something that nobody else has seen. I think that a vortech centrifical will work well,just have to fab some brakets and intake pipes

your car, your mod of choice i guess

well i wish everybody luck for all of thier projects

thanks when I get it done I will have plenty of pics pics

Yah those 3.8 superchargers from buicks are on ebay for 200-400$. Just need to fab up an intake and outlet for it, And hook a pulley right up to the ac bracket or something. And those SCs have self contained oil, And a built in bypass valve that bypasses the SC at idle and works like a blow off valve for a turbo. Its a pretty sweet setup.

Fuel management
 

You will probably spend thousands trying to get the fuel injection right.

thats what piggy backs, a/f , and other electronics and tuning are for. also the effiency of sc on a engine also depends on the engine. over all turbos are better but they are also more complicated. sc are just the road less traveled and alot of ppl like that

I was under the impression you would need to dump the factory ECU and go with an AEM or something else.

Not if you put the throttle body and afm before the SC(on the vaccum side). It would run just like stock, Unless it has like a pressure sensor in the manifold. Then the car doesnt even know whats going on. Plus they have a built in bypass for idle so the car would idle normally anyway, Unlike most sc cars with loopy/bad idle.

And whats nice about the roots stlye blowers is they are making boost as soon as the engine spins. So from idle you have boost. They just arent good for high boost and high rpms.

guess it will be trial and error with new injector size

aem? isnt that a brand?
u mean an ems

Well you can just do the standard 550/lexus afms. but I think the stovks would be fine for 6-8 psi.

Aem
 

Yeah they make Engine management systems. They cost around 2400 without shopping around which is the ems you mentioned. Thats the brand that came to mind.

im trying to decide on supercharger vs turbocharger and i know that in the long run a turbo would be better, but im more into street racing where i need that initial kick of a supercharger to get going off that red light whereas a turbo has lag involved. what to do?! if anyone can throw me some estimates in pricing for a turbo and sc id appreciate it. 1989 5 speed:bow:

there is a supercharged mk3 supra.. check out toyota G motors..

It has and can be done.. I have some pics of a MKIII with one and here is a link to a 5ME MKII with one.. http://www.youtube.com/watch?v=ic9OTrK4IYI

Here are all the pics i have of supercharged M motors and a twin charged 7M.
Eaton M90 7M.
http://i12.photobucket.com/albums/a2...k2/7mgze_2.jpg
http://i12.photobucket.com/albums/a2...k2/7mgze_1.jpg
Custom intercooler built into the intake..
http://i12.photobucket.com/albums/a2...k2/7MGZE_5.jpg
http://i12.photobucket.com/albums/a2...k2/7MGZE_4.jpg
http://i12.photobucket.com/albums/a2...k2/7MGZE_3.jpg
Intercooled Eaton M60 on 5m..
http://i12.photobucket.com/albums/a2...2/engine_7.jpg
http://i12.photobucket.com/albums/a2...2/engine_5.jpg
http://i12.photobucket.com/albums/a2...2/engine_3.jpg
http://i12.photobucket.com/albums/a2...2/engine_2.jpg
http://i12.photobucket.com/albums/a2...stmk2/9c10.jpg
http://i12.photobucket.com/albums/a2...stmk2/25eb.jpg
Twin charged 7M turbo and eaton M90..
http://i12.photobucket.com/albums/a2...charged7M4.jpg
http://i12.photobucket.com/albums/a2...charged7M3.jpg

i know this is graveyard revival, but i saw some funky info in these threads.

mostly the power thoughts and reliability issues between turbos and S/C's. turbos make great power, yes. but mostly at a higher rpm, after spool has initiated and peaked. the same goes for centrifugal style s/c's.

roots style blowers on the other hand make boost off-idle. so, take in the inherent effects of a turbos "lag" and pair it with a supers "instant" power.

sure, the turbo will make more peak hp, almost every time, against a roots style. the roots style will provide instant torque and off-idle power, creating better launches, more out of turn power in a wider range of rpm and, if tuned and prepped properly, carry the vehicle more consistently/controllably.

not to say turbos cant be tuned, they are exceptionally tunable and can provide wonderful power outputs and powerbands.

it all depends on where you want your power to come in and how you want to control the power and how the vehicle handles the power.

personally, i am a fan of torque, as that is what carries the vehicles weight. in drag racing, road racing etc... hp does not carry a car down a track, and a driver does not "feel" hp, only torque.

neway, just wanted to touch on this. also, in addition to the top fuel comment earlier, yes these engines make insane hp, but are also robbed of approx 1000-2000hp because of the supercharger. a brand new 392 hemi crate motor cannot drive one of those s/c's.

the only reason they use superchargers is the ease of tuning, lack of extra "fallable" parts and the consistency of a S/C at any given RPM.

http://www.4x4abc.com/jeep101/torque.html heres some info on HP and TQ.

cheers.