View Full Version : Supercharging stock motors...
Hi peeps,
Just a couple of questions for anyone who might know:
When supercharging a stock motor (a BMW 2.5L I-6) with a bolt-on supercharging kit, running say 9psi, are you increasing the strain on the motor to a point where the rate of wear would be increased by any significant amount?
What sort of ballpark power increase would you be expecting?
Does anyone know of any issues with this that one should be aware of, or is it pretty much safe provided the boost is kept at this level or below?
Cheers,
Tex
You would still have to use some sort of intercoolering. I think (not sure) that the newer BM's have 10.0:1 compression, so 9psi would be ok, as long as intercoolering and fuel messures were taken.
Fueling would be able to be taken care of by stock injectors just with alterations to the chip, right?
If intercooling was essential, surely the kit would come with an intercooler?
Tex
joshinthecity
13-05-02, 03:43 PM
ya.
I have a friend with a 89 corolla supercharged, and he is about to fit his 2nd intercooler (my std S15 one). According to him, intercooling is a MUST.
I have no clue about this personally, so I can't get into any big discussions here..
josh.
Actually, now that I think about it, I guess intercooling would probably be a necessity, seeing as superchargers create more heat than turbos...
Hmmm.
Tex
vrmmmpshhh
13-05-02, 08:13 PM
the corolla probably had a 4agze conversion so it comes stock with a intercooler anyway even if it is tiny. as for the bimmer, look for the kits on the net and see how they run them. theres plenty out there.
Inf3ct0R
18-05-02, 11:33 PM
Originally posted by Tex
Actually, now that I think about it, I guess intercooling would probably be a necessity, seeing as superchargers create more heat than turbos...
Hmmm.
Tex
i thought that supercharging was way cooler than turbocharging?
steve
It depends on how efficent the super charger is and if it is cetrafugal or a roots one or......
excelboy
19-05-02, 09:22 AM
tex im pretty sure that Q had a blown e36 325i.... might be wortwhile asking him abt what his experiences were......
cheers
Damn, and here I was thinking we were going to see a big 6/71 hanging out the bonnet of the Buick :D
THE ASH
19-05-02, 10:31 AM
I second 80dgy's motion for big blower on the Buick! :)
LJ30L: The s/c would be the screw-type - not sure what it's exact name would be...
Excelboy: Cheers, I'll see if Q can help me.
80DGY: Later. ;) It's something I'd consider after getting the car LOOKING sweet, and then if I really wanna be stupid and have some money to blow on the engine, it's definitely something I'd consider. :D
SloVR4: See above. :p
Tex
Q: Was that your supercharged Bimmer that AutoSpeed once featured?
No Chris, mine was an E30.
It was stripped & sold long before AS started.
Chris, my Dad actually tracked down and spoke to the guy who owns the Autospeed M3... The amount of engine work that guy has had done is insane - though he's running a bit more of a serious boost level... His advice to my Dad was "don't do it - unless you've got a shitload to spend on engine repairs etc.", but I'm thinking surely a bolt-on kit (which Dad would be more than happy with, performance-wise) would give you a nice boost, while keeping stock internals, and not noticeably increasing wear on the motor...
Q, cheers mate. Will read it tonight.
Tex
S/Cs are meant to heat the air less than a turbo, because they're being driven by the crank and insanely hot exhaust gases approaching the temperature of a mid-summer day in darwin are kept well away from the intake charge :)
But same as turbos, compressing air creates heat so if you are running higher boost you'll want to cool that intake charge somehow.
I used a roots style blower on a stnd motor in my TA22 celica.
A few of the things i found:
You need bigger injectors, mine ran outta flow veyr early in the boost/rev range. Yours may have enouhg in reserve. Get them flowed first and work out how much HP they can support.
You will definately need the computer remapped, or an aftermarket unit put on there. Again, i dont know about how much you can mess with the stnd ecu. check that first aswell.
Intercooling is essential, especially on a hi compression stnd motor. otherwise detonation will be a problem. Jam the largest one you can fit in there.
I ran about 6 or 7 psi boost and noticed almost a 100% increase in power, so it can work very well.
Hope this helps.
vBulletin® v3.6.7, Copyright ©2000-2010, Jelsoft Enterprises Ltd.