"Centrifugal supercharger" Question...
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
"Centrifugal supercharger" Question...
I have a 94 with a few mods, but my biggest question here is, if i installed a centrifugal supercharger, will the engine run properly if it is piped from the supercharger to the throttle body going through the MAF or do i need to use speed/density instead? I have allways wondered this as it is obviously a concern for me if i decide to fit a supercharger on my 94
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Originally Posted by bacardioil
call greg at blower works. great guy. ( greg@ blowerworks.net )
The answer to your question is yes you can still use your MAF sensor. I believe people get better results if you put the maf before the blower. There are kits out there for the '94 vettes. Blowerworks makes a nice kit, or you can go the Procharger way or even a vortech kit, or build your own.
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
The car can be made to run with the MAF. Procharger's kits route the discharge through the MAF. SD is nice for heavily modified cars, but is not the only way to go.
I ran for years with the blower pushing through the MAF.
Aaron
I ran for years with the blower pushing through the MAF.
Aaron
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
You can run a MAf with a centrifugal... I'm doing it now... You as posted above need to route the bypass valve to a the intake just past the maf to be sure the MAf is metering everything right.... ( otherwise it will try to compensate and run very rich.
If you pull more than I believe it is 370 gm/secit will set a code, but it can be resolved with lt1 edit...
also as posted you an put the MAF post Superchareras well... I run mine down near the airfilter...
If you go to the vortech supercharging site, under support they have the installation mnual you can download, that help explain this a bit more...
please fee free to email me if you need more info...
Regards,
Mo
If you pull more than I believe it is 370 gm/secit will set a code, but it can be resolved with lt1 edit...
also as posted you an put the MAF post Superchareras well... I run mine down near the airfilter...
If you go to the vortech supercharging site, under support they have the installation mnual you can download, that help explain this a bit more...
please fee free to email me if you need more info...
Regards,
Mo
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Thread Starter
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by Mo_Bandy
You can run a MAf with a centrifugal... I'm doing it now... You as posted above need to route the bypass valve to a the intake just past the maf to be sure the MAf is metering everything right.... ( otherwise it will try to compensate and run very rich.
If you pull more than I believe it is 370 gm/secit will set a code, but it can be resolved with lt1 edit...
also as posted you an put the MAF post Superchareras well... I run mine down near the airfilter...
If you go to the vortech supercharging site, under support they have the installation mnual you can download, that help explain this a bit more...
please fee free to email me if you need more info...
Regards,
Mo
If you pull more than I believe it is 370 gm/secit will set a code, but it can be resolved with lt1 edit...
also as posted you an put the MAF post Superchareras well... I run mine down near the airfilter...
If you go to the vortech supercharging site, under support they have the installation mnual you can download, that help explain this a bit more...
please fee free to email me if you need more info...
Regards,
Mo
So it apears the best way to have it is with the supercharger sucking the air through the MAF rather than blowing into it, would this be correct?
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
That is the way it is " traditionally " done yes.... However, the Maf really doesn't care. I would personally think that in terms of "stability" of the air drawing itthrough the MAF would be the best way to go..
REgards,
Mo
REgards,
Mo
Drifting
Joined: May 2002
Posts: 1,581
Likes: 2
From: The Motor City
Originally Posted by Casethecorvetteman
I have a 94 with a few mods, but my biggest question here is, if i installed a centrifugal supercharger, will the engine run properly if it is piped from the supercharger to the throttle body going through the MAF or do i need to use speed/density instead? I have allways wondered this as it is obviously a concern for me if i decide to fit a supercharger on my 94
However, if you DO have a MAF on the car now (or just want to run a MAF when you run a centrifugal supercharger), then the MAF is mounted between the supercharger output and the throttlebody. Mountng a MAF on the intake side of the supercharger is NOT a good idea. Centrifugal superchargers do not pull alot of vacuum on their intake side. A good way to think of it is that centrifugal superchargers hate to suck, but they love to blow. So by mounting a MAF in the intake side of the supercharger, you won't get the proper metering of the amount of air entering the engine. By mounting the MAF in the air stream between the blower and the throttlebody allows the MAF to provide the ECM with the proper amount of air entering the engine.
But again, using a MAF with a centrifugal supercharger ISN'T a requirement. A MAP system will work just fine (as long as you can tune the system).
Hope that helps.
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
I didn't really explain that, yes if you dont have a MAF it is not required.
Vortech and the others mount the Maf behind the air cleaner before the supercharger (which is where I have mine),but again I beleive it is because the air is less turbulant there. It's a matter of tuning... mine seems to meter fine where it is... as I mentioned about there a couple schools of thought on this... HEH...
regards,
mo
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
[QUOTE=TheCorvetteKid]Forgive me from starting from the beginning, but I have to ask - do you HAVE a MAF on the car right now? The reason I ask is because I believe that '94s used a MAP system (no MAF). [\QUOTE]
Nah youre wrong about that one little bit there mate, 94's went back to MAFs and ALSO have a MAP as a backup. So yep, it sure does have a MAF !!!
Thanks for your input though, i apreciate it.
Nah youre wrong about that one little bit there mate, 94's went back to MAFs and ALSO have a MAP as a backup. So yep, it sure does have a MAF !!!
Thanks for your input though, i apreciate it.
Drifting
Joined: May 2002
Posts: 1,581
Likes: 2
From: The Motor City
Originally Posted by Mo_Bandy
Vortech and the others mount the MAF behind the air cleaner before the supercharger (which is where I have mine)...
Originally Posted by Casethecorvetteman
Nah youre wrong about that one little bit there mate, 94's went back to MAFs and ALSO have a MAP as a backup.
Have you sent Greg at BlowerWorks an email about your concerns? Obviously calling him for where you are would be pretty expensive, but Greg is pretty good when it comes to emails. I've had correspondence with Greg several times via email just over the last two weeks. Try it: greg@blowerworks.net.
Good luck.
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
Hey Corvette kid,
No problem, if you look at my website ( in my signature), you can see how the Vortech is... right after the head there is a extruded aluminum housing that joins the output of the S/C right up to the throttle body... there is a bypass vavle that then reroutes the air that is by passed when not under boost back thorugh basically recycling it until the bypass valve closes. It may e different on the earlier C4s with L98's...
regards,
Mo
No problem, if you look at my website ( in my signature), you can see how the Vortech is... right after the head there is a extruded aluminum housing that joins the output of the S/C right up to the throttle body... there is a bypass vavle that then reroutes the air that is by passed when not under boost back thorugh basically recycling it until the bypass valve closes. It may e different on the earlier C4s with L98's...
regards,
Mo
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
here is a pic of the engine just for the sake of showing all of you how mine looks....
All this was done when i bought it.You might notice a couple parts out of place(brake booster for example!!),this is due to the fact the steering wheel has been put on the right hand side where it belongs....
All this was done when i bought it.You might notice a couple parts out of place(brake booster for example!!),this is due to the fact the steering wheel has been put on the right hand side where it belongs....
Last edited by Casethecorvetteman; Sep 26, 2005 at 09:55 AM.
Melting Slicks
Joined: May 2001
Posts: 3,014
Likes: 18
From: Raleigh, NC
Originally Posted by TheCorvetteKid
Mountng a MAF on the intake side of the supercharger is NOT a good idea. Centrifugal superchargers do not pull alot of vacuum on their intake side. A good way to think of it is that centrifugal superchargers hate to suck, but they love to blow. So by mounting a MAF in the intake side of the supercharger, you won't get the proper metering of the amount of air entering the engine. By mounting the MAF in the air stream between the blower and the throttlebody allows the MAF to provide the ECM with the proper amount of air entering the engine.
Am I wrong?
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by neat
I don't think this is correct. The supercharger system is sealed. There is no way for the engine to ingest air without it first coming through the supercharger. If you meter all the air entering the blower, your MAF reading should be right on the money. If you use a blow off valve, you'll run into problems when it opens, but other than that, you should be good to go.
Am I wrong?
Am I wrong?
Melting Slicks
Joined: May 2001
Posts: 3,014
Likes: 18
From: Raleigh, NC
When you have pressure in the intake tract, and the throttle body blades snap closed, that pressure has to go somewhere. Normally, it goes back into the blower. With some high boost applications that can cause damage to the head unit. It's probably not a good thing to have happen at any boost level though. The BOV open and vents that pressure when you let off the gas. It'll only be open for a second, and it will cause a rich fuel condition for a second because it's letting air the MAF 'saw' escape without going through the motor. The computer will supply the fuel for the escaped air. Make sense?