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I have a polished SN93 i was wondering how can i tell if it was upgraded with the better impeller..The car is apart right now but before i took it off the road i saw like 6 psi at about 4500 or so rpm...Also how do you drain the old ATF ?...how many miles does the oil need to be changed?....Oh yeah im going with a powerpipe from UPR is anyone using one?...did you see any boost increase?...thanks for any help....:)
The stock impeller is has straight fins and the upgraded slightley curved.
On this picture the one installed on the left is the upgraded impeller:
http://img.photobucket.com/albums/v1...g?t=1257801085
Oh and you drain the oil with a suction defice.
Ok so how much ATF does it hold...so like a suction type of thing to pull the old fluid out?...I dont hae the unit apart so there is no other way of telling if it is upgraded?
You don't need to take the unit apart. Just look at the impeller from the intake side of the supercharger (like the one pictured below). If you don't see the curved fin ends, you have the 'standard' impeller (again, like the one below). If the charger is still in the car then you'll have to pull the air filter/air pipe and have a look at the impeller that way (you may need a flashlight depending on how cramped/dark it might be on the intake side of the charger).Quote:
Originally Posted by MY 93 GT
http://www.superchargerhelp.com/pict...3&pictureid=18
Ok cool the blower is on the car but all the intake tube and discharge tubes are off so im sure i can look right in...so the one you have pictured is the standard one not the Upgraded one right?.....
Yes, the one that's pictured above is the standard impeller.Quote:
Originally Posted by MY 93 GT
If you can't see the impeller itself, try feeling around with your fingers. I'm sure you'll be able to tell whether the ends of the vanes are curved or straight just by touch.
Cool thanks ill check it this week being the car is in the shop and i got to get over there ...lol...I'll post back my results...:)
Ok i checked the impeller is the stock one...cool tip thanks...:)
Micheal so just to confirm I to do not know what impellar my GSS has fitted but had a closer lok at it to day and the vanes all had a slight curve on them at the tips so is the the uprater impellar ? As the big picture above looks like even the stock impellar has a slight curve on the vanes ?
You're correct in saying that the stock impeller vanes have a slight curve at their ends, but this curve is very slight. In fact, even in the photos of the stock impeller above the curve are the vane tips is difficult to see. The upgraded impeller vane curves are far more pronounced and should be much easier to identify either visually or by touch.Quote:
Originally Posted by MAGNUMPOWER
Unfortunately, I wouldn't be able to tell you whether your GSS has an upgraded or a stock impeller without a photo. Is there anyway you can post a photo of your GSS' impeller? That would help a great deal.
I called paradise wheels i wanted to do the VR4 upgrade he said no way you cant run that on the street you need to run alcohol fuel and special tunning...and the blower wont last it will need to be rebuilt like every 300 miles...what in the hell is that place talking about?????? Its an upgrade sure it has more boost but look at the vortech kits those guys are running 10-12 psi on stock motors with a good tune i see guys running 17 psi with those blowers so why cant i do the VR4 upgrade????...Oh yeah not to say he wants like $1400.00 to do the whole job to..i can buy a used paxton or vortech for that much.....i think he might have been drinking that day....:confused:
Some of that does not sound like Craig or any retailer wanting to sell something in this Economy. lol
Did he even say he had a VR4 kit because he has been out of them for years and keeps saying he will put you on a list.
Yeah he said it like 750 for the kit and 650 for labor...I would do it but then he's trying to tell me its an all out race blower cant use it on the street..need special fuel...tuning...blah..blah..blah..i then said could i upgrade my to the better vane he said yeah that would give me like 6-7 psi..he said i was better off doing that then going with the VR4 kit...im confussed now..so bascially my SN93 is no good its only good for 5-6 psi maybe 7....im trying to get my car to be in the 12's now will i even get there???????Quote:
Originally Posted by speedytang
It takes 30 minutes to install the VR4 parts. You need to shim the drive unit for more pressure but that can be done with shims made out of Soda Cans and about 2 hours of trial and error till you get the ball drag correct.. The complete procedure is on this site. The 'SN' was designed for 5psi to give 75hp to a engine of 305ci or less and not to destroy factory engine parts. A VR4 with fuel and timing components can get you in the 9's and a easy low 11's on the street. I have used a VR4 daily.
I agree thats why i dont understand why he wants so much money for it and why he said there is no way you can use it on a street car....Im going to have a 90mm LMAF sensor 42 lb injectors,UPR powerpipe, GSS340 255 lph fuel pump...i thought that would be plenty for the VR4 anywhere else i can look for one?Quote:
Originally Posted by speedytang
Quote:
Originally Posted by Michael
Here are a couple of pictures michael can you tell what I have from these ?
http://i484.photobucket.com/albums/r...N/DSCF1256.jpg
http://i484.photobucket.com/albums/r...N/DSCF1255.jpg
Thanks Mark
From the looks of it this is the curfed impeller.
You are looking at the curfed side, now feel with your finger under a blade and feel if it is straight or curfed.
VR4 and Ebay go together like Peanut Butter and Chocolate.
Based on these photos, it looks like you have the upgraded impeller in your GSS.Quote:
Originally Posted by MAGNUMPOWER
Thanks for your help guys so what sive pullys should I run with the uprated impellar ? Its on a 1998 5.9 Chrysler Magnum engine. and what boost should i expect ?
Mark
So do you think i can find one on ebay?..Will that head unit fit the SN93 bracket?Quote:
Originally Posted by speedytang
VR4 is a modified 'SN' so everything is the same. To really get the power out you need a 8 rib belt. I have a billet 8rib with under-drive pulley if you want it before it goes on ebay. I think I also have a low mileage belt also I can put in the box. $100 shipped
Quote:
Originally Posted by speedytang
What will that do for my SN93 now more boost...Or is that only good for the VR4 kit?...Yes im interested..in that set-up..just want to know what will be the benefit using that set-up?Thanks...
It will spin the supercharger faster without going to a smaller blower pulley which causes belt slip and being a 8 rib for when you get a VR4 will allow 15 psi with a 3.5" blower pulley or get a pulley for your 'SN' and keep the boost climbing at high rpm(+4500 rpm) and not allow the boost to drop. Makes tuning easier also because you don't end up with boost spikes. The biggest problem with belt slip other than your boost dropping at higher rpm is that you tune for more fuel at higher rpm but if your boost starts to drop at 4500 rpm and your car is putting more fuel at that rpm you will be really rich and cause high rpm fouling of the plugs. I have seen this so many times since fuel is based on air flow and rpm. The bonus on this pulley is also it is a under-drive for the accessories and that is worth horsepower and it is something you can't do with the Paxton blower pulley since it fits inside the stock unit. You can install this pulley and still use your 6 rib till you change over and get the benefit of the extra blower speed.
I have a free listing credit on Ebay if I post my parts by Friday at Midnight. If you want this just PayPal to aaronspeed@embarqmail.com and I will ship.
Quote:
Originally Posted by speedytang
Ok so this goes on the crank right?...so i have to change the stock belt or the blower belt?...so if i leave the pulley thats on my SN93 now, will that crank pulley up my boost?....or do i have to change the blower pulley to see more boost...im a little confussed sorry....:confused:
It is a Crank Pulley. You can probably use your blower belt it depends on how much you have the belt adjuster down. It will increase the supercharger speed usually 2 psi and boost will come in sooner since your increasing the crank speed to the blower. You will need a shorter drive belt or get a under-drive kit for the water pump and alternator. The under drive kits are cheap($45) it is the lower billet supercharger pulley that cost so much.
Underdrive Pulley sets
http://cgi.ebay.com/ebaymotors/82-91...Q5fAccessories
One more question please I have a set of underdrive pullies already not on the car but i have them...lol so i dont need that but say my belt is too loose how do i find a belt to fit?..also it still will stay a 6 rib for now?....And how would it g to a 8 rib later?...I know im asing alot of questions sorry:)
Oh crap i forgot to ask will isee like 7 psi with this pulley it is a 5 lb kit now also were can i get a smaller supercharger pulley to up boost with this lower pulley?
The belt won't be large with the other pulleys. The factory hydraulic unit will take it up. If your factory belt has stretched just get a .5" smaller belt. Purchase a 8 rib supercharger pulley. I am sure I have 8 rib belts hanging in the shop I will put one in with the pulley. You can get a smaller blower pulley but you will over drive the unit. I would not go smaller than 4" on the 'SN' with this crank pulley or get a 3.75" 8 rib and shift at 5k rpm and if you find a VR4 you will have everything for 15 psi.
Quote:
Originally Posted by speedytang
Ok so i can use my stock 6 rib belt for now cool and then later go to a 8 rib blower pulley to up the belt to a 8 rib?...How much boost will i gain by just putting the underdrive pulley on for now?..i dont know if you saw that in my last post....
You will see a increase but you might deal with belt slip no matter how tight you get the belt. I seen with my VR4 2 psi increase. I have only owned VR4 unit which have a tighter ball pressure. This larger pulley was to cheat the factory supercharger warranty since the supercharger was not messed with. This equates to taking the 4.25" factory supercharger pulley and installing a 3.85" unit. The under drive pulley you will gain 15hp with the water pump and alternator units. This has been tested over and over in the last 20 years and is probably the best bang for the buck.
Quote:
Originally Posted by speedytang
Oh ok good to know...So at least i might get a liitle increase thats a help..lol..So i might see a little gain in boost on my gauge then ...I can only hope..Im using an UPR powerpipe too everyone says you get more boost with those any truth to that?
The biggest restriction on a supercharger is the intake pipe. Everything is a help when your trying to pump air into the engine.
Yeah so going to a 4 inch UPR powerpipe and a 90mm LMAF senor mounting out int the fender should help a little..and i see they make a bigger dicharge tube to go into the TB will that help also?Quote:
Originally Posted by speedytang
Not such a problem on the discharge side since it is being pushed to the engine.