Max Boost on RS5 B9 2.9l TFSI

[detti]

Hi, I have a question about the durability of the crank drive and the connecting rod on the 2.9l TFSI. How much boost pressure can the crank drive withstand? I'm asking myself this because there is a tuner in Poland who gets over 1000 hp from this engine.
That can't work with E70 and ignition, can it?
What experience do the tuners 034, APR etc. represented here have?
Detti

[wwhan]

034 RS5: https://www.034motorsport.com/blog/0...ynamic-tuning/

[detti]

Thank you .
Yes, I know this link. I drive the 034 stage3 myself. I have dyno tested round about 600hp.
My question is how much more boost pressure can the 2.9TFSI take to generate even more power. Is it possible to drive with more than 3bar? I only want to run gas with 93aki / 98ron.

[JohnEnglish]

Thank you .
Yes, I know this link. I drive the 034 stage3 myself. I have dyno tested round about 600hp.
My question is how much more boost pressure can the 2.9TFSI take to generate even more power. Is it possible to drive with more than 3bar? I only want to run gas with 93aki / 98ron.

If you want to run on 98 RON pump gas only then you're not going to be able to do much more.

[detti]

Ok. But what does that mean in figures? Can the connecting rods withstand a few more psi or has the limit already been reached?
Is there a difference in boost pressure between the 93aki and E85 or E60-70 files? How high are the boost pressures for the 034 stages?

[wwhan]

Ok. But what does that mean in figures? Can the connecting rods withstand a few more psi or has the limit already been reached?
Is there a difference in boost pressure between the 93aki and E85 or E60-70 files? How high are the boost pressures for the 034 stages?

I don't think the 2.9L engine can handle excessive Detonation or Preignition, so one better use a high octane fuel of at least E70, when running excessive boost levels, which is what 034 motorsport did. This engine is not designed to handle very high compression forces, like in a diesel engine.

[JohnEnglish]

Ok. But what does that mean in figures? Can the connecting rods withstand a few more psi or has the limit already been reached?
Is there a difference in boost pressure between the 93aki and E85 or E60-70 files? How high are the boost pressures for the 034 stages?

no one outside of VAG engineers probably know that. This isn’t a hugely popular engine that’s been around for a long time so there’s not a lot of data from people who have taken it to the limit and blown the engine. Your best bet is to look at what kind of power the mainstream tuners are getting on pump gas. That’s probably as far as you want to push it. If they could safely push it farther, they would.

[detti]

Of course, nobody knows for sure. I just wanted to know how high the boost pressure is with other tuners / stages. I can't believe that 1000hp is possible without further increasing the boost pressure. At the moment I am running approx. 2bar with 034 stage3 93aki at 600hp. I wonder why I had to install large pressure sensors if only 2bar are still programmed. Or is more boost pressure programmed for stage3 e60-70?

Translated with DeepL.com (free version)

[kfxjc]

034 already stated the weak link is head studs which when stretched create leaking head gaskets. You will have that issue before breaking a rod.

[detti]

Thanks, that's useful information.

I was worried that the pleul would be the first to break.

[wwhan]

....I wonder why I had to install large pressure sensors if only 2bar are still programmed. Or is more boost pressure programmed for stage3 e60-70? ...

Of course, one can run higher boost pressure with E70 than with 93 octane Petrol. The E70 fuel seems to have an octane rating of somewhere around 102-105. The higher octane fuel should should be much more resistant to knocking.

The E70 034 Motorsport tune may use a higher maximum boost level than the 93 octane tune.

see..."Novel Method to Estimate the Octane Ratings of Ethanol–Gasoline Mixtures Using Base Fuel Properties":
https://pubs.acs.org/doi/10.1021/acs...yfuels.9b04204

[detti]

Yes, the better knock resistance is already clear. And therefore much more ignition can be programmed with E85 or E60-70, hence the more power.
But is more boost pressure really programmed? And if so, how high is it with the 034 stage3?

[VVG]

At 1000hp, you basically need to mechanically build an entirely new car. Driveshafts, transmission, differentials, chassis bracing, cooling systems of every kind, etc, etc, etc, all need to be beefed up

[detti]

Hey, ok, it's clear that you have to boost the engine at some point if you want a lot of power.
The 1000 hp figure was just an example! I would be interested in specific boost pressure figures at which the original engine does not break down.
I drive with 2 bar boost pressure, is there anyone who drives with more boost pressure and does so without fail?

[Msonbol0923]

Hey, ok, it's clear that you have to boost the engine at some point if you want a lot of power.
The 1000 hp figure was just an example! I would be interested in specific boost pressure figures at which the original engine does not break down.
I drive with 2 bar boost pressure, is there anyone who drives with more boost pressure and does so without fail?

If 034 can add more boost, they would have... You're likely at the limit. If you add more boost without moving to better fuel, you will have more knock which will eventually blow your motor. They go hand in hand, the goal isn't to see how much knock your motor can handle, that's basically what you're asking.