The possibilities with Turbocharging
#31
Originally Posted by Herr-Kuhn
I know guys are pushing 600 HP out of the 2.2 liter Audi motors with about 38 psig and 8000 RPM...so it could be possible. .
#32
Originally Posted by chris0626
To my knowledge there are no manufacturer-equipped, turbocharged cars with stainless manifolds as they are extremely prone to cracking.
Depending on the size turbo he goes with, will dictate the pressure he has to run. As I have read in a number of his posts, ultimate numbers are not what he's after, but rather a very streetable (albeit extremely fast) car.
And yes, a 951 can run that much with enough boost... my 2.0l can too, so what's your point? I'm sure he will not have to run a crazy amount of boost to get where he'd like to be.
And yes, a 951 can run that much with enough boost... my 2.0l can too, so what's your point? I'm sure he will not have to run a crazy amount of boost to get where he'd like to be.
#33
You actually beleive that 900 HP Audi engine will last...now that is funny! An engine at that power level may have 50 hours of life (on boost). Also you mention race fuel, of what 112 octane? Who want to pay for that at the pump anyway? Mine will be built to run 93 octane pump fuel and will be built to last, not some 30 psi kiss of detonation death engine. 600 HP on a 5 cylinder is in fact pushing it and it takes a lot of money to get there as well. You people seem to forget, the engine does actually have to last to be considered a success, otherwise if you are just after numbers strap on a bottle and go.
#34
I doubt that a stock compression S4 can run 30 psi even on racing gas, intercooling, water injection and seriously retarded ignition. The compression is too high. It possibly could do so on alcohol with careful tuning and therefore would be a monsterously powerful motor - but more than the drivetrain could withstand.
On pump gas, probably 5, maybe 7, psi is tops on a stock compression S4.
Why not add a second mini fuel tank and a simple switch valve for racing fuel for those few times you really want to go fast?
On pump gas, probably 5, maybe 7, psi is tops on a stock compression S4.
Why not add a second mini fuel tank and a simple switch valve for racing fuel for those few times you really want to go fast?
#36
Originally Posted by TAREK
The early 80's 3-series blocks handled 1200 hp in Nelson Picket's Brabham BMW F1 racer, for at least the entire race....say 90 minutes. Don't know the difference between that block and the current 3-series blocks, but if it's anything like it, it should be good for the street with occasional spirited driving...No?
#37
What the hell is it with this subject?
My Grandfather taught me that there are two things you should avoid discussing if you wan't to keep out of arguments, politics and religion. I think I may have to add "boosting a 928" to that list.
My Grandfather taught me that there are two things you should avoid discussing if you wan't to keep out of arguments, politics and religion. I think I may have to add "boosting a 928" to that list.
#40
Originally Posted by Skunk Workz
Ok...ever heard of the 951? It happens to have stainless headers...
Well...there are lots of people on rennlist claiming (and showing dyno's) of 420+ rwhp on 18 psi with loads of torque from 3K rpm....on 3-litre engines. Then an 4.5-litre+ engine running 15 psi with the same amount of tune should easily lay down 500+rwhp without sacrificing the low end torque. A puny little 60-1 (or something in that size range) should do that easily.
Well...there are lots of people on rennlist claiming (and showing dyno's) of 420+ rwhp on 18 psi with loads of torque from 3K rpm....on 3-litre engines. Then an 4.5-litre+ engine running 15 psi with the same amount of tune should easily lay down 500+rwhp without sacrificing the low end torque. A puny little 60-1 (or something in that size range) should do that easily.
So you think that the production of power is linear (as based on displacement alone)? Your nuts, it's not nearly that simple. Higher compression does not lend itself to higher boost pressure(s) nicely... that's where tuning comes in... (so the tuning wouldn't be the same either).
As someone mentioned, an Aquamist (or other) water-injection system would be very beneficial to decreasing the likelihood of detonation (say, have it come on at 7psi or so).
#41
Originally Posted by Herr-Kuhn
You actually beleive that 900 HP Audi engine will last...now that is funny! An engine at that power level may have 50 hours of life (on boost). Also you mention race fuel, of what 112 octane? Who want to pay for that at the pump anyway? Mine will be built to run 93 octane pump fuel and will be built to last, not some 30 psi kiss of detonation death engine. 600 HP on a 5 cylinder is in fact pushing it and it takes a lot of money to get there as well. You people seem to forget, the engine does actually have to last to be considered a success, otherwise if you are just after numbers strap on a bottle and go.
Last edited by Skunk Workz; 09-28-2005 at 12:29 PM.
#42
Originally Posted by DFWX
I doubt that a stock compression S4 can run 30 psi even on racing gas, intercooling, water injection and seriously retarded ignition. The compression is too high. It possibly could do so on alcohol with careful tuning and therefore would be a monsterously powerful motor - but more than the drivetrain could withstand.
On pump gas, probably 5, maybe 7, psi is tops on a stock compression S4.
Why not add a second mini fuel tank and a simple switch valve for racing fuel for those few times you really want to go fast?
On pump gas, probably 5, maybe 7, psi is tops on a stock compression S4.
Why not add a second mini fuel tank and a simple switch valve for racing fuel for those few times you really want to go fast?
#43
Originally Posted by chris0626
Ok, you got me on the manifold (cast iron is still better).
So you think that the production of power is linear (as based on displacement alone)? Your nuts, it's not nearly that simple. Higher compression does not lend itself to higher boost pressure(s) nicely... that's where tuning comes in... (so the tuning wouldn't be the same either).
#44
Originally Posted by Herr-Kuhn
You actually beleive that 900 HP Audi engine will last...now that is funny! An engine at that power level may have 50 hours of life (on boost). Also you mention race fuel, of what 112 octane? Who want to pay for that at the pump anyway? Mine will be built to run 93 octane pump fuel and will be built to last, not some 30 psi kiss of detonation death engine. 600 HP on a 5 cylinder is in fact pushing it and it takes a lot of money to get there as well. You people seem to forget, the engine does actually have to last to be considered a success, otherwise if you are just after numbers strap on a bottle and go.
#45
Originally Posted by Skunk Workz
Sorry...seen engines having better spool with an exact copy in stainless of the stock cast iron manifold (all measurements were the same),so I'll stick to stainless anytime.
Originally Posted by Skunk Workz
I know it's not linear...lots of hp is just about tuning it for a given (high) rpm and make as much torque there as possible. Strangely then,I see people raising the compression on Supra's from 8 to 8.8,slap in much longer cams and see a substantial gain... (if the tuning is right...of course). But,they're just ricers...
It seems as though we've gotten off-topic in this thread (imagine that?!)
As SharkSkin stated, tuning for 91 would seem to be wise so everybody can play.
Originally Posted by Herr-Kuhn
You actually beleive that 900 HP Audi engine will last...now that is funny! An engine at that power level may have 50 hours of life (on boost). Also you mention race fuel, of what 112 octane? Who want to pay for that at the pump anyway? Mine will be built to run 93 octane pump fuel and will be built to last, not some 30 psi kiss of detonation death engine. 600 HP on a 5 cylinder is in fact pushing it and it takes a lot of money to get there as well. You people seem to forget, the engine does actually have to last to be considered a success, otherwise if you are just after numbers strap on a bottle and go.