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just installed my sn-2000 on my 94 t/a. Now im leaking oil from my front cover gasket. I currently do not have a vaccum pump or a breather in a valve cover, would either one of these create less pressure on the gaskets. It only leaks hard when under a load. Any sugg are appre
Need a breather because your blowing boost past the rings and pressurizing the motor.
thats kinda how it feels when i get around 5k. So would just a breather work or would i be better off with a vac pump, my car doesnt have a smog pump in it, it was like that when i bought it a few months ago. Thanks for your help
also what would be the best way to hook this up, vac pump to breather?
Actually we had the thing happen on my buddy's '97 Firebird lt1.
You need to atach a hose to the passengerside valvecover and route that to the inlet of the supercharger just near the airfilter so that the SC sucks the pressure out.
We had some serious leakage to especialy when we had the the valvecover tube still atached to the tbi, witch alows the SC to pump air into the valve cover :shocked:
You could instal a breather ofcoarse but a lt1 just has some blowbye.
ok so let me get this right, run a hose from say the oil filler hole down to a spot after the airfilter? Sounds easy enough, i just know that when i get around 5200rpm at full throttle i feel like im losing some power and boost and then i smell oil and it sprays the bottom of my car. When im normal driving it runs great.
yeah there is constant vacuum after the airfilter.
Do you have the lt1 ? ifso on the passengerside cover used to be pipe with hose conected to the tbi, direct that hose to the airfilter pipe and be sure to plug the tbi.
The driverside cover has the oil fillercap right ? just leave that alone.
You might experiance after a while that the maf sensor get dirty with oil splaters, so you must clean that every now and then or as I heard from other lt1 users is put a air compressor water seperator between the hose to colect any oil drips .
Check this side http://www.ls1tech.com/forums/forumdisplay.php?f=9
ok well i hooked up the breather to the intake tube and the leaking seems to have slowed, Now i think im having a VATS issue, when i turn the key on the security light comes on and the car wont crank. Fuel pump comes on though
What is a VATS ?
An anti theft system integrated with the key.
F=MA
VATS is the biggest PITA your ll ever experience with an f-body, luckily you can bypass it, if thats even what wrong with my car. Any ideas on why my power kinda levels off around 5200rpm? i did not hook up the paxta map fuel box, wasnt sure if i needed it with the walbro 255 and the walbro booster. Should i install the extra injectors that hook to the paxta map and spray into the throttle body?
VATS is the biggest PITA your ll ever experience with an f-body, luckily you can bypass it, if thats even what wrong with my car. Any ideas on why my power kinda levels off around 5200rpm? i did not hook up the paxta map fuel box, wasnt sure if i needed it with the walbro 255 and the walbro booster. Should i install the extra injectors that hook to the paxta map and spray into the throttle body?
I think you do need the paxta fueler, exept you need to screw some screws back to not make it to rich.
yeah im hopin i get the car back by this weekend so i can put that on there and see if it makes a diff. Im pretty sure it will
do you you guys happen to know how i could find out what screw it is i need to adjust for the fuel?
reed this : http://www.carrollsupercharging.com/ click the superfueler button on the left.
oh wow............ that link is very informative and looks like tuning this thing could take awhile. Thanks for that info though. Finally got the car backtoday and it ended up that my walbro 255 and the walbro booster were drawing too much power for the stock harness, ended up unhooking the booster till i can get a rewire
ok new question............ i need to know the best way to get rid of my crankcase pressure. I ran a hose from the pass side valve cover to the intake before the blower but under higher throttle its still blowing oil out of my brand new rear main. Isnt returning that oil through the blower a bad thing? Also after installing and relocating the MAF with the blower i get a SES light saying my MAF is junk......... would that be whats causing the car to fall on its face after 5K?
You shouldn't have oil pulling from the valve cover. If there is either boost is entering the crankcase from some where ex. intake manifold gasket, head gasket, broken rings, etc.. Be sure there is no other pcv tubes that could be fine with natural aspiration but with pressure can be pressurizing the crankcase.
As far as the MAF error code, are you running a blowoff valve, if not you can be reversing air through the meter which will lower the voltage and give you an error code.
um ok, i do believe my car does still have the pcv valve, also yes i am running a blow off valve but its open, it doesnt have the tube returning down to the intake pipe before the blower and after the MAF.
any suggestions guys.................
Some cars have a crankcase vent tube before the throttlebody usually to the valve cover. This is not a pcv valve but it is a way for pressure to enter the crankcase on a supercharged application.
The air bypassed from the BOV must be returned to the inlet side of the blower on any mass air application, this can be your check engine code. :)
ok so ill re-route te BOV line to the inlet, what about this pcv valve. I know my car has the elbow coming from the pass. side valve cover with a hose to the tb. What should i be doing to get rid of this blow by. Will eliminating the PCV help, or get rid of that elbow
Think of it this way, If there is any possibility that from the discharge side of the supercharger there is any possible way it can blow boost pressure into the crankcase, this needs to be eliminated. Usually I cap the ends off and run an open breather on each valve cover for crankcase ventilation.
Now if there is a pcv valve, an actual valve between this area this should act like a check valve and not allow boost to enter, in this case you would be ok.
On mass air equiped car if you take the two breather option you would need to eliminate any pcv valve into the lower intake as this wil also pull unmetered air under vaccuum conditions.
Another way around this is to take that tube as long as it is just a tube and route that to the inlet side of the blower as well.
Trying to simplify how the pcv works is usualy you have a vaccuum source from the upper manifold that pulls vaccuum from the crankcase, also to better vent the crankcase and for emmissions reasons you have a tube that goes from the valve cover to throttle body area which also pulls vaccuum in naturaly aspirated conditions. The pcv valve in itself would not be enough. In a supercharged application pressure is going into the throttle body and by leaving the tube there you are pressurising the crankcase which is a cause of oil blowing out of not so happy places and you don't want to do this.
Well, Notch, on a 5.0, the TB to oil filler hose is actually the supply side of the PCV system, replacing the air the outlet side, at the back of the manifold, draws into the upper intake from the crankcase.
F=MA
ok, well i have a MAF car, and i know i still have the pcv valve in the lower intake mani. So i need to get rid of that pcv. maybe im just not picking up as quickly as i should, but say i eliminate the pcv, should i just run the 2 breathers and then t them together and then run that tube where?
also is it me or shouldnt the MAF sensor be after the blower to compensate for fuel changes and actualy air readings? or is it supposed to be between the air filter and the intake of the blower? And that would explain why i need the paxta map and fueler...... thanks alot guys
You can't "get rid of PCV". You must have crankcase ventilation, especially in forced induction apps because you WILL have blowby and it's gotta get out of the crankcase somewhere.
If you don't want powered PCV, the best bet is to make the induction and PCV systems discrete. You can probably get by with a non-powered PCV system. A powered PCV uses engine vacuum to draw crankcase fumes into the manifold for consumption in the normal combustion process.
What you can do is ventilate both valve covers and install breathers on them.
This MAY be adequate to ventilate the block. If it's not, your engine condition should be checked, as you may be blowing excessive amounts of combustion pressure past bad rings. If engine condition checks out and you still require more breathing, then you'll have to power the system, either by engine vacuum or an external vacuum pump.
F=MA
ok so then thats where im gonna start, if i T them together, where should i put the return line going to? i dont like the idea of running it to the intake of the charger. As far as the pcv, should i make any mods to that if i adding another breather..... my apologies if im being a PITA
It's OK, ya idjit. :laugh: I really think you should just put breathers in each valve cover, vented to atmo, and see what happens. Meeeelions of people have gotten by just fine with this simple, uncluttered type of system. You'll need a hole saw and a couple push-in breathers. Like these:
http://www.hotzoneperformance.com/Pr...Z%2D4870%2DSET
F=MA
Did I seem to say otherwise. Leaving this tube on (sorry from the throttle body to the valve cover) will cause pressure to enter the valve cover, hence the crankcase on a supercharged engine.Quote:
Originally Posted by F=MA
Yes you need pcv, never did I say in my post to eliminate it and have no source of crankcase ventilation. What I did say is the correct means of doing it while still using a powered pcv system or on the otherhand nonpowered open element breathers for each valve cover.
http://www.hellionpowersystems.com/g...album=14&pos=4
here is an example
so asking both of you generous motor heads............ do you both think that 2 breathers t-d together to the atmosphere like F=MA mentioned will be enough? i know one of you think so
NMNOTCH
what should i do with my pcv coming from the intake mani.? i kow leave it on, but reroute it or just leave it? maybe i missed interpre what you said.
ALso i just looked at my pcv valve on the driver side, and...... it has a small piece of hose coming off of the pcv going right back into the mani next to it.... is that RIGHT????
thanks so much guys
I think f=ma and I are on the same field we just misunderstood eachother, is there any way you can post a picture this might make it a little easier to explain.
yup ill be sure to get one on tomrrow morning, it just doesnt look right to me if its supposed to release crankcase pressure, why send it back in to where you just pulled it from? kinda odd.
Why tee them together? It's coming out of the same crankcase. Just put a push in in each VC and see what happens. Don't run extra hoses you don't have to.
If you do this you can block off the intake manifold PCV because you are now breathing out through the VC push ins.
Am I clear yet? Lets try Ascii2 :) :
---T----__________----T-----
I________________________I
I______________________I
I___________________I
I I
I I
L________________]
--- = Valve covers
T= push-in breather
___ = intake manifold and engine block
Engine is viewed from the front end, looking along the VCs.
F=MA
Crap! HTML reformatted my engine!
The pic Notch puts in post 30 shows a single brether setup like I describe. Put one on the other VC too and yer set.
F=MA
I think there is one on the other side too, hard to see but hoped for the basic idea, Ditto with the picture F=MA thats great:laugh:
hey that was a real good illustration!!!!!!!!!! i got what your saying, im still working on the pics of the pcv, im at work right now so itll be a bit