max boost limit?

[timucin]

what is the maximum boost that aby or adu engine can handle?
cause i heard an owner is boosting 2.5 bar peak and 2.2 bar continous on his rs2. that doesnt sound realistic to me?
what do you think?

[timucin]

sorry forgot to mention: all stock engine.
factory pistons,connecting rods,street gas etc.(92 octane)

[S2 Ant]

Sounds way to high to me..... look for the post on here about 2nd hand rods..... if he's running that much boost i should think his should look something like that by now! assuming they are still in one piece

[timucin]

totally agree with you;
what is the amximum you ve seen or heard?

[Mihnea]

Timucin, the maximum a stock RS2 engine with stock rods+turbo can handle is 2.2 Bar peak boost.


I have heard too from a guy in Greece about an RS2 running 2.5 Bar peak boost and 2.2 "continuous" boost but I just can't believe this ****, the guy didn't know anything about engines but was telling me and 2 other german tuners how we should tune RS2s to get to 500+ HP....


cheers,

Mihnea

[timucin]

hi Mihnea;
long time no see


probably my friend read about that guy in Greece and telling me like he is doing.

there is a big-bet here man
well see at the end of january...

i have some questions for you;
-after new exhaust ,car was boosting 25-26 psi's on boost gauge for half an hour,then hose damaged and it got slower

-after new hose ,the car again was running like a dog with 25+ psi but the next morning again turned back to normal 20psi max

-cleaned maf,boost was 25+ for a short time and dropped to 20 again

normally boosts 20 but after some service for a short time it goes 25+ by somehow
i know sounds stupid but it happens
why -what can be the reason for that?
thnx

[audiman]

What!! There is no way a stock RS2 engine can do that surely. The conrods would just come out of the engine! Either that or there is no torque in the engine just loads of unuseable power at the top of the rev band.

[Lee]

Originally posted by timucin
hi Mihnea;
long time no see


probably my friend read about that guy in Greece and telling me like he is doing.

there is a big-bet here man
well see at the end of january...

i have some questions for you;
-after new exhaust ,car was boosting 25-26 psi's on boost gauge for half an hour,then hose damaged and it got slower

-after new hose ,the car again was running like a dog with 25+ psi but the next morning again turned back to normal 20psi max

-cleaned maf,boost was 25+ for a short time and dropped to 20 again

normally boosts 20 but after some service for a short time it goes 25+ by somehow
i know sounds stupid but it happens
why -what can be the reason for that?
thnx

MAF still too dirty?
Dump valve?
Injectors?
Fuel pump?
FPR?
I am going through the same thing!

[Mihnea]

Originally posted by audiman
What!! There is no way a stock RS2 engine can do that surely. The conrods would just come out of the engine! Either that or there is no torque in the engine just loads of unuseable power at the top of the rev band.

Tom, I've already seen RS2s tuned by an, ahem, expert tuner in France running 2.2 Bar peak (really a short peak that happens only when you put your foot down to the metal) then dropping off to 1.8 constant boost up to about 5.5k and 1.4 at redline. Nevermind the turbo, I've already plotted those figures on a compressor map and they're way off the scale, which means that the turbo can only hold for a limited amount of time, but if there's no knock, the rods should still be able to handle this.

Cheers,

Mihnea

[KramRS2]

We ran 2,5bar of boost in overboost (@4000rpm) falling to 1,8-2bar to redline on Ricardo's car. He has a stock engine (RS2), but with a huge IC, new injectors (+1 auxiliar), huge garret turbo, SS tube manifold and running alcohol as fuel.

The problem was the MAF that was just sucked by the turbo.

Now he run 1,6bar from the beggining to the end with no problem at all (only 4 MAFs blowed) . 10.000Km and still running hard.

I'm not saying that every engine hold this boost, but in that case the engine supported it.

[Mihnea]

Originally posted by KramRS2
We ran 2,5bar of boost in overboost (@4000rpm) falling to 1,8-2bar to redline on Ricardo's car. He has a stock engine (RS2), but with a huge IC, new injectors (+1 auxiliar), huge garret turbo, SS tube manifold and running alcohol as fuel.

The problem was the MAF that was just sucked by the turbo.

Now he run 1,6bar from the beggining to the end with no problem at all (only 4 MAFs blowed) . 10.000Km and still running hard.

I'm not saying that every engine hold this boost, but in that case the engine supported it.

1.6 Bar at redline is definitely ok with a larger than RS2 turbo, but blown MAFs don't sound right for me at this HP level, they are a real problem only above 450 HP....

[audiman]

Oh well, if these 'experts' can do it, then fair play. I personnaly would do it on my turbo thats even bigger than that.

@Mihnea, my Dad congratulates you in your work. He drove the car this morning and was well impressed. Came to work with a massive grin!!

[Mihnea]

Originally posted by audiman
Oh well, if these 'experts' can do it, then fair play. I personnaly would do it on my turbo thats even bigger than that.

Watch out for 1.8 bar constant boost through 5k, falling off to about 1.3 Bar at redline next time m8, your car will kick serious *** with that!!!

@Mihnea, my Dad congratulates you in your work. He drove the car this morning and was well impressed. Came to work with a massive grin!!

Cheers, I'm more than pleased by this!

[audiman]

Cant fooking wait! Bring it on!

[leo]

Hi

Very interestic topic I have one question about influence of boost on the engine. I've heard, that there is possibility of blowing up the head of the engine when it's too much boost, and some say the danger level is around 1.5 bar (21 psi) . Is there a real danger for the engine head with that pressure? What can I do to avoid this?