superchargers dont put out that much HP ?

[Hellred]

Most healthy SC M3 engines 3.0L or 3.2l will push out between 280-310 at the wheels depending on boost. Alot of cars suffer in numbers because they haven't sorted out air fuel ratio mixtures.

My kit runs 6psi now, and I must be a little over 300RWHP. With 7psi, things should climb a bit..

SCs are very sensitive to temperature, so aftercooling or water injection is recommended...

[nicholas]

I am about to install a RMS stage 2 supercharger in my M3. I will also be installing an aftercooler, oil cooler, and extra radiator and fan, as well as 28.8 Lucas injectors (I already have a CAI and Exhaust). I am hoping to get 320-340 rwhp running 8lbs. I decided to go with a S/C over a turbo for two reasons. 1. The S/C is a more driveable setup with more linear power delivery. This is especially important for me because i spend most of my time in the canyons. And 2. I got a smoking deal on the S/C.

[paul e]

naah, i saw dinan numbers as 250 rear wheel HP on an obd2 m3 with their supercharger ... so normally it would have about 200 rwhp ... these numbers are underestimating it right ? so what do u guys htink about powerdyne

As others have said, this is not at all typical of what can be expected...There have been many Dinan Vortech OBDII M3s making 300 hp at the wheels. His rating of 354 crank hp has been equaled many times when interpolated back to the wheels on a dyno..And if thats not enough, add some cooling and a larger crank pulley..These things make 400 crank hp without much difficulty. Ask me how I know!

[Changster]

hmm ok, also where can i get an install ? a local mechanic ? or should i go to the dealer or a specialized place ?

if i use a dinan .... do i need dinan software ? or can i get it somewhere else like different company's software? also hows maintenence ? you need to just change oil or what ?

also can you add a oil cooler or aftercooler to a dinan setup ? how much do those run

also how much is a larger crank pulley ? it just replaces the smaller pulley ?

im excited ... i might go the SC route !!!

[AMG]

hey guys is it true that a supercharger is safer for the engine than a turbo?

[fourfa]

no, not necessarily

[J32A VTEC]

yah i believe that gains a lot of hp...

[paul e]

>>hmm ok, also where can i get an install ? a local mechanic ? or should i go to the dealer or a specialized place ? <<

Id go to a Dinan/BMW dealer first...especially if the bmw dealer is the one whom yo deal with on warranty issues...Youre more likely to get decent treatment if the same dealer who sold and warrantied your dinan sc is the one who is caring for your car anyway.

>>if i use a dinan .... do i need dinan software ?<<

Yes

>>you need to just change oil or what ? <<

No unusual maintenance required.

>>also can you add a oil cooler or aftercooler to a dinan setup ? \<<

You can add an oil cooler....RMS has the only aftercooler recognized as a retrofit for the dinan kit..However, you can easily add water injection from aquamist, from AA if you like, at a lesser price. Either one will lessen heat soak, and allow you to explore some small boost increases if you like.

>>also how much is a larger crank pulley ?<<

A 1" larger crank pully lists for $350.

>> it just replaces the smaller pulley ? <<

There are 2 pulleys: a crank drive pulley, and a sc pulley..The former is the bigger, the latter the smaller...Enlarging the ratio between the two is how you increase boost.

>>im excited ... i might go the SC route !!!<<

It aint cheap, but, if you plan on hanging on to the car for a while, and want it to be as entertaining as it can be, go for it!

[stimpee]

Originally posted by Quadzilla
A quick how to on forced induction. Assuming that timing and fuel delivery are in line, the power a turbo or super charger generates is almost straight line proportional to the amount of air they are forcing in. However to preasurize the incoming charge causes it to heat up thus effectivly limiting the amount you could stuff in. Crunch it too much and it will burn in the manifolds. And remember that while a supercharger can generate 2-300 HP it also takes about 100 or so to run it depending on the setup.

Saying a SC takes 100hp to run it is pure smack talk!!!

A centifugal SC on a BMW sized engine will take no more than 30 horsepower TOPS in a very high boost setup. Calculations I have been doing recently are showing less than 25hp at peak rpm for a Lysholm compressor at 15psi. For reference, the Lysholm is slightly less efficient than a centrifugal, so it will take MORE horsepower to get the same amount of flow and pressure.


The amount of horsepower required to drive a SC is proportional to the flow and pressure of the air. Higher pressures demand much more power.

It amazes me how many people on these boards will talk "factually" about things about which they know little or nothing...

[paul e]

It amazes me how many people on these boards will talk "factually" about things about which they know little or nothing...

I know, steve...I joined this board a few wks ago as a retreat from the drivel that permeated Bimmer.org. Now it seems that some of the no mind nonsense is starting to show up here...Its amazing how sure people are of themselves, when they are totally out to lunch with regard to the facts....100 HP eaten up by SC parasitic drag! What a joke!!

[vishal]

Originally posted by paul e


I know, steve...I joined this board a few wks ago as a retreat from the drivel that permeated Bimmer.org. Now it seems that some of the no mind nonsense is starting to show up here...Its amazing how sure people are of themselves, when they are totally out to lunch with regard to the facts

You're going to find this wherever you go, it's just a matter of how it's dealt with by the board's admins and its members. At least here, the format is much better and you have your handful of people that really know their stuff.

[Changster]

so all in all ... what else should be done if i were to get a SC ? are they high maintenence if i run low boost? any common failures or problems with them ? im trying to do lotsa research to know about it all.

[paul e]

so all in all ... what else should be done if i were to get a SC ? are they high maintenence if i run low boost? any common failures or problems with them ? im trying to do lotsa research to know about

Changster, Ive had my 8 psi Dinan system for exactly 2 yrs prior to my recent upgrades..In that 2 years, the car has been the most trouble free car Ive ever owned, and I've owned quite a few over the years. Our bmw engines are pretty damn strong. They take to supercharging like a duck to water. By general concensus, the Dinan system is well sorted out, and very few folks report back anything different than Im crowing about. Go get it..Youll kick yourself for not having done it sooner. Youll wonder to yourself what all the pre SC anxiety was about.

[JohnSergio]

Originally posted by V Shah
Yes, I have OBD2 and dynoed 300 to the wheels. The car you saw that dynoed 250 was either extremely heat-soaked, wasn't tuned right, or could have been dynoed on a Mustang dyno which gives lower numbers.

mustang gives more accurate numbers*

[Changster]

ohhh boy i couldve just found the nicest deal of a lifetime ...

ok so i found a guy with a car the same year as me and he's returning his car to stock ... and he has a SC in his car that hes selling ...

is it possible to :

-just switch his computer with software for my computer with no software

- his injectors for my stock injectors

?

im very interested in this since he's returning his car to stock while im modding out so it works out perfectly ... oooooh boy. and i modded every other aspect of my car besides the engine (except for ECIS intake) so this would complete it