Swiftuh

its almost like i posted this, 2 days ago hehe. BTW guy, what did you do with the supercharger set up you got from zbrown, that was you right? Im planning on running 5psi on a stock NA

SonicRaT

iTrader: (6)

That's on my GTUs, still working on that one, hehe, ran out of money. And that was a mix of pump gas & 104, the 21psi was not intentnional, guess I forgot to adjust the boost controller after taking it off my DSM. Whoops.

Parastie

SonicRat is my hero

1987RX7guy

iTrader: (3)

I'm working with it.

DEZERTE

Well my excuse for not searching this that my legs are broken, thx for thelinks

Swiftuh

oh yea, how big is that pulley gave you? im still trying to figure out what i need for a constant 5psi of boost

1987RX7guy

iTrader: (3)

I didn't get a 5psi pulley. Although I am working with different sizing and some nice fellas with CNC mills/lathes to make some new aluminum pulleys for when I come out with it. Hopefully my site returns soon you will be able to find more info on our product(s) there.

Santiago

Swiftuh

sweet deal. if you would, lemme know what you find out with differant pulley sizes. Id like to run 5 psi, and have that power on tap around 1500rpm or lower. Also, do you have any idea where i can get the belt for it?(cheap) What vac lines are used for the wastegate(bypass) and Bov? and where did he have to wastegate dumping off at? the cats or somthing? Sorry for all the questions, just trying to figure a few things out, without having the car yet. i want to pretty much make everything i need before i get the car.

thanks
Mike

1987RX7guy

iTrader: (3)

We will probably be offering Custom machined pulleys for our customers for different PSI outputs. We only plan on going up to about 10psi right now in our "stage III" kit. I don't know what you mean by wastegate dump. Super chargers do not use wastegates as far as I have seen. The BOV would use the same vac line any BOV would. PM me for more info on our kit or our Pulley upgrades.


Santiago

Swiftuh

well zbrowns setup has a wastegate, many eaton 4th gen superchargers have the wastegate built into them. You cant keep a constant boost pressure with just a bov. Im supercharging an NA car, so there arnt any vac lines for bov or wastegates. PM me with some info on the kit if you get a chance. thanks man

Mike

1987RX7guy

iTrader: (3)

Well if it does have one I don't believe I have seen it. I have zbrowns setup that I am basing myself off of and there are no indications of a wastegate. You keep constant boost with a s/c because its rpm driven AFAIK so the boost rises as you go up in the rpms. I may be wrong but I don't see evidence of a wastegate anywhere on the super charger internal or otherwise.


Santiago

Swiftuh

lol i can email you a pic of zbrowns wastegate, i have no idea how to post pics.. ill try it though

1987RX7guy

iTrader: (3)

santiagorx7@gmail

if he sent it to me then I have undoubtedly seen it.

Swiftuh

k sent, the larger 1' piping comming of the bottom of that is either going back to the intake, to the exhaust, or maybe below the car and just dumping atmosphere. the smaller hose goes to the metal vac lines on the back of the engine bay(not sure what they are for). because the wastegate wasnt big enought to vent pressure at high rpm shifts, he added a bov.

the wastegate job is this. You can set up the pully so it spools up the blower at low rpms, so if you were boosting 5psi, you can have it down around 1500rpm or less. Now, the faster you spin that supercharger the more air it puts out, and thus more psi, and without a waste gate, would build up tons of prussure untill pipes, or your engine blow. The waste gate opens a vent on the out put side of the blower when the pressure is above 5psi. so you can have 5 psi throughout the rpm range, without worrying about boost creep.

mike

1987RX7guy

iTrader: (3)

That is a bypass valve, you hook that up to a vac source.

From what I understand your description is incorrect. it is not a boost controlling device in the mannor you state. The way it was explained to me it is to control boost under idle or low throttle situations.

Swiftuh

pretty much the same thing.

Swiftuh

think about it, if you didnt have something to vent the excess pressure at any rpms, how would you control your boost level?

mike

1987RX7guy

iTrader: (3)

Think of this, the bypass only operates under vacuume that means that under boost it shuts closed. There isn't any excess boost that I am aware of.

Swiftuh

http://www.bankspower.com/Tech_howtu...egateworks.cfm Bypass valve is just another name for Wastegate.

1987RX7guy

iTrader: (3)

Dude what is it with your insistance on that? Zac told me it is for boost bleed-off until zero vac exists. I know what i'm telling you its going to shut closed when the vac goes away so how can it bleed off boost then? He also told me that it was to bleed off boost when you shift soo that would lead me to believe that it does the same function as a stock style(TII anyways) bov. Which is NOT the job of a wastegate. PM him if you don't believe me.

patman

iTrader: (3)

superchargers do not require a wastegate.

they increse in airflow as the engine speed increases, but it is a linear progression, and the engine's air intake is linear (approximately), so the boost level remains almost constant.

pat

Aaron Cake

iTrader: (1)

Just put the throttle body before the supercharger like it should be done in the first place. Problem solved.

Swiftuh

Im not trying to be a jerk, its just talk. What zac told you is the function of the BOV. A blow off valve works exactly how you explaned. A wastegate is differant, and doesnt work off the same vac lines of a bov. It connects to a pressure actuator that works off manifold pressure. The wastegate has a set(or adjustable) spring inside it, pressing on a piston, once the intake pressure exceeds the pressure of the spring, it opens up letting the excess pressure out. If this is not done, during accelloration the the blower will create massive amounts of boost = boost creep = bad. Zbrowns setup has a wastegate, and a bov, i can quote him on that, so unless he didnt send it do you, its there.

In this application Pat, a wastegate is required(unless your superchargers output, and engine cfm intake are exactly perfect to give you the correct ammount of boost.). like is said, easton started making the wastegate a part of the superchargers. Superchargers can be set up to work with linear progression. But you wont get your max boost untill high engine rpms, and you will have no power down low. With a wastegate, you have max boost at lower rpms.

I tought about puting the tb ahead of the supercharger, but the amount of fab work involved isnt work it, when you can just put in a Bov and a wastegate.

best wishes,
Mike

1987RX7guy

iTrader: (3)

Mike, I can guarantee you that the bypass valve that you showed me IS NOT functioning as a wastegate. That bypass valve is the STOCK "BOV" off of an audi. It can not function as a wastgate as you have described. It can only function the way I described. Unless Zac can tell me that I am incorrect, which I do not believe I am, it doesn't have a wastegate. Perhaps the super charger has its own wastegate internally but I haven't seen evidence of a dump anywhere. The Bypass valve that you sent me a picture is not dumped anywhere it just recirculates like a normal stock style(non-open air) BOV very much identically to the stock TII BOV.

patman

iTrader: (3)

dude, I think it is obvious that everyone here knows how a wastegate and BOV work, and the differencew between them, so you can stop explaining it every time. the argument is basically whether you will get boost creep with a SC and no wastegate, and the answer is no. boost creep is a uniquely turbo problem, and in fact results from a wastegate that is too small.

As I said before, a SC increases its ouptut volume at almost exactly the same rate as an engine increases its intake volume. there is no discrepancy based on 'fit' as this is primarily regulated by pulley size. put the right sixe pulley on the SC, and it will give you that amount of boost consistantly at all RPM ranges. That is the whole advantage of a SC setup.

pat