Supercharger modification

[duwackerTSi69]

This isn't dsm related, but I do wanna know if it's possible about taking a factory supercharger from a Cadillac or a Mustang and modifying the runners to mate up to a different engine? Long story short, it's for my Audi that has a 4.2 v8 in it and anyone that has one of them cars knows that if you want go fast parts your gonna have to sell kidneys or something to afford some serious go fast mods. Lol. They're are a few kits out there but they are crazy expensive. Anyway, like I asked. IV got a few ideas rolling around my head about how to do it, and all in all, maybe I might be over looking something, or not seeing why you couldn't hack up an old SC by cutting off the mounting flange and building it up to mate to the different engine. With one person and the ability, a lot of things great can happen. Being an old dsm'r and seeing what others have done,all I can say is dsm'rs are a resourceful group of people that make shit happen. I tried posting on the Audi board but from what I have learned is that they have a hard time comprehending how to install spark plugs . Sorry in advanced if your a Audi enthusiast . Thank you in advanced and if this is in the wrong place.

 

[David dsm]

Maybe but its gonna be alot of custom fab and work is it a centrifugal supercharger or a roots or wat type of super charger to be more exact and maybe answer ur question

 

[duwackerTSi69]

I was looking at supercharges that were a factory option. Nothing like the pro chargers or anything. And tell you the truth, I'm not to knowledgeable with sc's and I know I got allot of reading to do. I'm not sure if what I explained helped to much haha. The way I'm thinking of it, is either to not chop up the sc and build a adapter to mate it to my car, kinda like how the runners are made with a sheet metal intake. I'm a Cnc Programmer/Machinist by trade so my resources to make this work seem very doable.

 

[David dsm]

Oh ok i see yea an adapter sounds like it would work but now the issue is fuel system and tuning the car to accept the supercharger but its possible but the amount of time it would take would be substantial

 

[David dsm]

Also im sorry i didnt mention but the belt routing for the supercharger would be another weird task haha sounds like a fun project tho a first in my book

 

[duwackerTSi69]

Oh I already understand it's gonna be allot of work. I'm a patient man tho so it's ok. Especially with something like this. Just look up APR sc kits for v8 Audi. The amount of money they cost is insane, and that's why I'm glad I come from my 2g awd tsi, or even the dsm community. Lol. The Audi guys are just now learning about the holset turbos.haha. Well maybe not just now, but not to long ago. Lol.

 

[David dsm]

Haha dude those are crazy expensive just looked em up i would be doing exactly what you are if i was in ur situation yea but back on topic i do think its possible haha but the only problem that i can think of is if the supercharger is too long or short for the engi e and doesnt line up with the belt or what not and also i think imo is that you would maybe be better off with a turbo setup which is easier to install and fab up and might be even cheaper haha well its up to you tho

 

[duwackerTSi69]

Yea a Sc kit and they're price is a down payment on a house . Yea I thought about a rear mount turbo system and that's definitely a viable option. I'd have to do a rear mount set up bc of engine space, and I'm in Texas so it's hot here already. I'd like to use a pair of hx35's or even hy35's for spool reasons. I'm not sure about my engines air flow requirements, but id think I would want to run up to 10psi max. My ecu is eprom style so that's a plus. Thinking about it now,a turbo set up would be simpler. Especially if it's a rear mount.

 

[David dsm]

Yea it would be simpler and even better because it doesnt use the any engine power to spin it

 

[duwackerTSi69]

You got me wanting to pull the trigger David . How good are you at reading compressor maps and matching them to what a certain engine needs to be a well worth it mod? Instead of going twin hx35, say just one or even a hx40 pro? I'd only want to run maybe 7-10psi max. And I'd want instant spool up.

 

[Seamus]

If you want to go fast sell tour s4 for a b5 s4. I had one for 7 years, I got it in 02 as a treat when I got my first deal job. It still cost a ton to modify correctly, but youll get a lot better results than boosting a 4.2. Its never going to be stupid fast without going crazy. Making the b5 is very easy bevause you can use mostly oem parts. I had rs4 and then rs6 turbos on my s4 and it was a blast. Over 500 torque at 3000rpm.

 

[David dsm]

Im pretty good i have a friend who could do it he has more experience but we'll need to know the cubic inches the amount off cc per chamber and also the turbo u would like to run such as the hx40

 

[duwackerTSi69]

That sounds great and all, but IV got lots of sentimental value in my car. I rebuilt the engine and a lot of other things and it's a great car. I'm not trying to break records or anything,I just wanna make it different and a little more powerful. All while in luxury just heading to work . IV actually got an 02 A6 with 4.2. Not an S4. I swapped the whole front end to the 08 S line A4. I don't like the A6 look. I do agree with what your said tho on getting the b5. It's just I already have this car and I own it. It's awd and and it really has allot of power for being a heavy pig haha.

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[David dsm]

And also whats the redline 6k 5k or what because say its a 256 cubic inches and it opens the valves lets say every two revolutions we would need 256 cubic inches of air per 2 revolutions and the psi or the lbs of air the turbo would be able to move would hv to be enough to supply the engine with tht air and the effiency would be at about 75 to 85 percent because the intake throttle and other factors would create some restriction so if the boost gauge says 15 psi not all of those 15 psi are entering the chamber but just tell me the turbo ur gonna use and cubic inch

 

[David dsm]

Also you would like a turbo tht reaches maximum boost at ur peak torque to get that beautiful turbo pull haha so just name a couble turbos u would like and ill post the maps and data on here wen im done

 

[duwackerTSi69]

4,172cc and 255 cubic inch. It's a 40 valve dohc(5 valves per cylinder) engine. I'd like to use hx40 pro, mainly bc I have one. If I remember right it flows more the the twin scroll hx35 7 blade? I'd like to keep max psi at around 7-10psi. For my engines sake .

 

[NordicSaab]

Nice looking car!

I would think a centrifugal supercharger would be the way to go. Space is really tight in those cars but it would fit. If your wanting to do this on the cheap get a powerdyne supercharger, about $500 on ebay, and get slightly larger injectors. Your ecu should be able to self adjust if you stay under 9 psi. Belt should be relatively easy... hardest part is welding the additional pull on the crank for the SC.

Good Luck!

 

[spyderdrifter]

I know everyone loves eBay because crap is cheap, but an eBay supercharger is going to fall victim to the same problem as eBay turbos. I say stay away from eBay power adders like these and either get a used one that isn't a knock off, or save for a new one. Hope this build works out for you.

(And why does eBay keep coming up blue, is it a hyperlink?)

 

[duwackerTSi69]

Nice looking car!

I would think a centrifugal supercharger would be the way to go. Space is really tight in those cars but it would fit. If your wanting to do this on the cheap get a powerdyne supercharger, about $500 on ebay, and get slightly larger injectors. Your ecu should be able to self adjust if you stay under 9 psi. Belt should be relatively easy... hardest part is welding the additional pull on the crank for the SC.

Good Luck!

Thank you. That would be super easy about the crank. I'd put a piece of bar stock in the cnc lathe and make a small program to Maine or an adapter that could be "sandwich'd with my stock pulley and existing mounting bolts. That way I could always revert to stock easy. Or. Weld on a ring to my crank pulley, then stick the whole pulley in the lathe and machine it out till it runs true, and also notch out the ribs where the belt will go. It'll look like it's one piece

I know everyone loves eBay because crap is cheap, but an eBay supercharger is going to fall victim to the same problem as eBay turbos. I say stay away from eBay power adders like these and either get a used one that isn't a knock off, or save for a new one. Hope this build works out for you.

(And why does eBay keep coming up blue, is it a hyperlink?)

I would never buy anything like that from eBay.Lol. If I go the Sc route, I'll be using a charger from the Caddy or a Mustang. You can find almost new units for pretty cheap all over the net.

 

[NordicSaab]

Well powerdyne is not a ebay product or a Chinese made product. It's pretty good quality. To my knowledge there isn't a Chinese centrifugal supercharger availible like there are turbochargers.

I would avoid the Eaton style OEM superchargers... they work well but in a tight engine bay your going to have an uphill battle... not to mention you will have to scrap and reproduce a intake manifold that fits the supercharger... The oem intake manifold on audi products are good! Why reinvent?

 

[David dsm]

Alright duwackertsi69 haha ill hv the data up later today so u could see it

 

[mercaholik]

Your ecu is going to need some sort of ability to be tuned, I don't know about audi's programming, but some companies will go into limp mode if it sees positive pressure. Plus that's probably a high compression engine anyway, guessing upwards of 10:1 so ability to retard timing will become needed. At what point is dependent on several factors, including compressor efficiency and I/c, but even so you gotta compensate for bigger injectors, tune a/f ratio due to car being n/a. Also adding a turbo to the exhaust system changes the engine's ve curve and you wanna keep a safe tune and be able to use your new found power. Man I honestly wanted to do just that, turbo Audi's 4.2 awd beauty, I'm jealous good for you man. I have some books on turbo charging that have formulas for sizing things, turbo, I/c , charge piping etc. Let me know if you want me to give you any of them.

 

[yhype]

Your forgetting the easiest power to add to vehicles...Nitrous, when tuned properly shouldn't be anything to worry about.

 

[duwackerTSi69]

Thanks, for the input, but this isn't my first rodeo . I'm aware of everything that's needed to be looked into just like you stated. Audi's are notorious for being picky and going into limp mode. My engine is 11:0.1 compression, so yea it's high. If done a lot of reading and research and 10psi max should be ok on the ecu and internals. There's SC kits out there for my car and they all utilize the factory ecu with corrective tune obviously. My ecu is Eprom so that's a bonus. I know here on dsmtuners there tons of guys into that stuff and very good at it. That's why I absolutely love this community. IV never met more resourceful group of people that make something out of nothing and figuring it out to go fast My car is completely stock, except for full exhaust, it really gets up and moves. With power to spare and tow your boat haha. I really think I'm going the STS turbo rout to be honest. It'll keep the bay temps down, and I won't have to make any exhaust manifolds to mount the turbo. I have all the mechanical ability to complete this project along with the funds. All I need know is the balls to start the project . I prolly should start looking into the tuning above all else, and who could possibly help out on that.

 

[duwackerTSi69]

Having a bottle in the trunk is nothing really to brag about in my book. Haha.

Your forgetting the easiest power to add to vehicles...Nitrous, when tuned properly shouldn't be anything to worry about.