frenchyd said:
FuzzWuzzy said:
In reply to frenchyd :
VW/Audi
Thank you. How big an engine are they found on? Something with a V6?
What’s most likely the reason they are being junked? Accident damage? Transmission? Just too expensive to repair?
Any particularly easy to chop out of their home?
Since I’ll need a pair it would be nice if they were relatively common
finally please let them be mechanically controlled rather than computer controlled. It’s hard enough to figure out fuel requirements. Controlling the wastegate too would be a killer for my feeble skills.
The most common engines that VW/Audi sold with turbos were the 1.8T and 2.0T 4-cylinders. Certain Jettas, GTIs, turbo Beetles, Passats, TTs, A4s, A6s were all sold with that turbo. You'd probably need to scavenge two of them, though, and you'd need to do some research to validate that they were the same (a number of variations in the turbo over the years).
Audi turbo V6 applications do exist but they're less common, primarily it's the 2.7T out of the B5 S4 and C5 A6 or allroad. Those turbos have a reputation for dying around 100K miles, though. Note that the "3.0T" out of B8 S4s and C6/C7 A6s is actually a supercharged motor, not a turbo.
What's your power goal? Generally speaking, OEM turbos are small and often only have limited headroom available.
In reply to codrus :
I want to build a cheap racecar out of my Jaguar XJS V12
stock it has just short of 300 hp. I built one in the past using 2 Saab turbos and came up just short of 500hp. Making only about 6 pounds of boost.
The engine has great heads but only a 7.8-1 compression ratio. This time I intend to use E85 fuel with all that alcohol to cool things I feel confident it can survive 15 pounds of boost.
The Easy button is a pair of T45 made in China turbos but that won’t leave anything for better cams.
Hope you have a knock sensor, prefereably connected to advance control and waste gate, or it may be a very short experiment....
wspohn said:
Hope you have a knock sensor, prefereably connected to advance control and waste gate, or it may be a very short experiment....
Nope. Only the late 92-96 had those. I’ll do the old fashioned way. Start out prudent and increase as I develop it.
Dirtydog said:
Here's a pair. Don't know how close to you though. Price seems right.
https://minneapolis.craigslist.org/ank/pts/d/audi-a6-turbochargers/6537344454.html
Thanks I’m right in the area now, I’ll make a call
So, still think you'd have less clutter running a single turbo.
frenchyd said:
In reply to codrus :
I want to build a cheap racecar out of my Jaguar XJS V12
stock it has just short of 300 hp. I built one in the past using 2 Saab turbos and came up just short of 500hp. Making only about 6 pounds of boost.
The engine has great heads but only a 7.8-1 compression ratio. This time I intend to use E85 fuel with all that alcohol to cool things I feel confident it can survive 15 pounds of boost.
The Easy button is a pair of T45 made in China turbos but that won’t leave anything for better cams.
If your goal is 500 hp, then the VWAudi turbos are not a great choice. Most of them are K03s, and are maxed out at less than 200 hp worth of air each. The high end TT (the '225 hp' verison) had a K04, as did the B5 RS4 and C5 RS6. You might find the 225 TT in the junkyard, but the RS cars are rare (RS4 never came to the US)
If I were aiming for 500hp, I'd probably look at a pair of GT2560s. Real Garretts, not the copies.
I'd suggest ko4's preferably from a cobalt ss (off the lnf engine)
maybe a kkk k26 or k24 from an old Audi 5000/100 generally good for about 300 hp out of a 2.2l 5 cylinder
¯\_(ツ)_/¯ said:
If you don't want to use multiple smaller turbos, big diesel stuff is your best bet. Look for powerstroke Fords, the turbo is up high at the back of the engine- they seem to get snatched quickly by the truck guys, but usually diesel vans and ambulances still have them attached and they can be accessed through the doghouse from inside the vehicle.
Lots of Saabs are turbocharged and they tend to hang it out in front of the engine where it's easy to get to. VW 1.8t turbos are tiny so I'd avoid those. What kind of stuff is usually in your local yard?
Actually if you total displacement is 3.5-4 l two of these would in theory be enough for that. 1.8x2 =3.6.
I would be looking for the turbos off a Mazda 3. Those are a single on a 2.3l. So two of those would work well. Be carful with the ones you get they also put turbos on the Mazda 2.3 that is in there small suv those are different. They have a smaller hot side so they Spool quicker to get the suv moving off the line better but will suffer at the top end.
And avoid vgt stuff. Takes the simplicity out of turbos lol.
frenchyd said:
Dirtydog said:
Here's a pair. Don't know how close to you though. Price seems right.
https://minneapolis.craigslist.org/ank/pts/d/audi-a6-turbochargers/6537344454.html
Thanks I’m right in the area now, I’ll make a call
Hey frenchyd. How'd youmake out with the turbos? Even if you don't use them for this project, may come in handy down the road at that price. Good luck.
Went to get the cash to buy them. SWMBO had pretty close to drained the account paying for her wedding stuff ( we’re getting married this summer).
So I need to collect another paycheck before I can buy anything. Curses!!!
What’s horrible is I was too brusk with her so I had to spend the evening saying I’m sorry. Grrrrr!
In reply to frenchyd :
Congratulations on your upcoming celebration. But as you well know, If Momma ain't happy, ain't nobody happy. And if Poppa ain't happy, who cares. Hopefully you will have the dough for fun shortly.
yupididit said:
And avoid vgt stuff. Takes the simplicity out of turbos lol.
VGT? Please explain? Variable gate Turbo’s ? velocity gate Turbo?
In reply to Dirtydog :
Yeh, she’s a really neat lady who does so many things very well and always puts her best efforts.
You cant believe what a great cook she is and how neat she keeps the house. ( in spite of ongoing construction)
plus with her new job starting Monday she’ll make more money than I will. Again!
So I was a cad to complain.
yupididit said:
Air flow in that compartment is terrible. Under race conditions the stock valve springs softened towards the end of the race greatly increasing the chance of swallowing a valve.
They ultimately solved it with the valve springs used in Formula 1 Cosworth
frenchyd said:
yupididit said:
And avoid vgt stuff. Takes the simplicity out of turbos lol.
VGT? Please explain? Variable gate Turbo’s ? velocity gate Turbo?
Variable Geometry Turbocharger
yupididit said:
frenchyd said:
yupididit said:
And avoid vgt stuff. Takes the simplicity out of turbos lol.
VGT? Please explain? Variable gate Turbo’s ? velocity gate Turbo?
Variable Geometry Turbocharger
If only there was someone who lived near frenchy who used to work for a major turbo manufacturer as an engineer.... I wonder who that might be...
dean1484 said:
¯\_(ツ)_/¯ said:
If you don't want to use multiple smaller turbos, big diesel stuff is your best bet. Look for powerstroke Fords, the turbo is up high at the back of the engine- they seem to get snatched quickly by the truck guys, but usually diesel vans and ambulances still have them attached and they can be accessed through the doghouse from inside the vehicle.
Lots of Saabs are turbocharged and they tend to hang it out in front of the engine where it's easy to get to. VW 1.8t turbos are tiny so I'd avoid those. What kind of stuff is usually in your local yard?
Actually if you total displacement is 3.5-4 l two of these would in theory be enough for that. 1.8x2 =3.6.
I would be looking for the turbos off a Mazda 3. Those are a single on a 2.3l. So two of those would work well. Be carful with the ones you get they also put turbos on the Mazda 2.3 that is in there small suv those are different. They have a smaller hot side so they Spool quicker to get the suv moving off the line better but will suffer at the top end.
It’s either 5.3 or 6 liters stock figure 3 liters per side.
In reply to yupididit :
Thanks. You are right. Too complex for me!!! I’m only brave enough to use turbos because I can use the early stock injectors, nip the ends off and flood E85 in there.
Fueled by Caffeine said:
yupididit said:
frenchyd said:
yupididit said:
And avoid vgt stuff. Takes the simplicity out of turbos lol.
VGT? Please explain? Variable gate Turbo’s ? velocity gate Turbo?
Variable Geometry Turbocharger
If only there was someone who lived near frenchy who used to work for a major turbo manufacturer as an engineer.... I wonder who that might be...
I give up, who was a Engineer who worked for a major Turbo manufacturer? 
frenchyd said:
It’s either 5.3 or 6 liters stock figure 3 liters per side.
Then you probably need 4 VW turbos. :)
