[KGB_123_99]

http://www.***********.com/content.p...e-have-learned

[Bedista]

i would really think pushing the n20 past 350 hp and 400wtq is too much. that's way more than any popular tune output correct? ( dinan,bms, etc) thanks for sharing

[Daas]

What exactly were they expecting? They pushed it beyond its limits and it blew up. I think that's fair.

[SergioK]

They were making 350+ wheel horsepower and 400+ lb-ft of torque. That's just too much for the stock N20 internals. It isn't a strong motor. It is hardly BMW's best work:

These people are downright idiots. The N20 is one of BMW's most efficient powerplants and they pushed it wayyyy past it's engineered design limits. After it fails they then state it isn't a strong motor?

Let's see, BMW's engineers designed the engine to produce 245hp yet these clowns push it up to almost 400hp. Gosh, I wonder what happened? Morons.

[bahasad]

Originally Posted by SergioK

These people are downright idiots. The N20 is one of BMW's most efficient powerplants and they pushed it wayyyy past it's engineered design limits. After it fails they then state it isn't a strong motor?

Let's see, BMW's engineers designed the engine to produce 245hp yet these clowns push it up to almost 400hp. Gosh, I wonder what happened? Morons.

Nothing wrong with experimenting.

There are 4 cylinder engines out there pushing more than 400 HP on stock internals.

I agree the N20 is not in that category, but this is definitely interesting to note as many people on this side have been trying to push this motor.

[KGB_123_99]

The HP/TQ values were excessive and I agree it's not BMW's fault. However, getting next to no oil pressure during hard turns and also on braking kind of is.

[Fanitron]

I think the key for me would be trying to resolve the oil pressure issues vs the Max power output. Tbh ~300/300 HP/torque is more than enough for me as a daily driver.

[TomDenmark]

Will my engine fail?

JB4+DP+Ethanol?

[DrifterX]

Originally Posted by TomDenmark

Will my engine fail?

JB4+DP+Ethanol?

Just as long as you don't brake or turn hard

I agree... >300 ft-lb of torque to the wheels is way more than enough for daily driving.

It's really nice to see someone is taking this motor to it's limit's and thoroughly analyzing the results. I'm really looking forward to seeing some of the build kits that come out for N20 in 5-10 years. I'll definitely be a customer

[Safety2213]

Looks good. Looks like an E46.

[TurboM]

Originally Posted by TomDenmark

Will my engine fail?

JB4+DP+Ethanol?

Mine did. Good luck

[Labeef]

I think some people are being a little harsh. The whole point was to push to the limit to vet the engine to back up their product, which is more than most vendors do.

While most n20/26's will never be pushed to these limits, it's important to know what the limits are. Specifically with oil pressure. Not only does oil cool, it lubricates. So it's important to keep the pressure up. What some fail to see is that you can get the same level of G's on stock motor with heavy suspension tuning and tires.

It's a little disappointing that these motors aren't built to handle the power. A 30k dollar evo or wrx can handle more with less engineering.

[RM7]

Originally Posted by Labeef

It's a little disappointing that these motors aren't built to handle the power. A 30k dollar evo or wrx can handle more with less engineering.

Older WRXs, like my 2.0, were held back by the TD04 and the injector size. After 2005, they went to larger injectors that were nearly the same size as the STI, allowing for nearly as much power. The problem with both though was that they dyno pretty low actually. Bone stock STIs dyno around the same WHP as the N20. Those old 2.0 WRXs were well below 200whp, the larger 2.5 was still around 200whp. And if I remember right, the 265hp version is around 215 or so awhp measuerd at the wheels. These are pretty low numbers to start off with, so the fact that I was able to get my WRX up to around 280 crank HP wasn't all that impressive.

I had the full exhaust setup, the full intake setup, larger intercooler, and other bits, but the stock turbo and injectors can only pass so much air and fuel, and if you try to tweak the tune for more, you real quickly get way too lean and start wrecking things. Those engines dumped lots of fuel into the cylinders during acceleration to cool the mixture and everything else associated, the engine counted on that.

With the Subies, you could add as much as 50-60hp with bolt-on mods on the stock turbo and injectors, which is fairly consistent with what we see here. If you want more, you need to start heavily modifying the car so it won't self destruct, which means larger turbo, bigger fuel injectors, bigger intercooler, higher flow fuel pump, etc. If you want to get to the 400hp range and keep the thing from grenading, you will need forged internals and all sorts of other stuff. A WRX engine won't do 400hp. An STI block (forged) will get close, but require some serious modification to get there, especially if you are after the elusive 400whp, that's a much larger turbo and lots of supporting mods.

Although the Evo follows a similar theme, it's engine block was something a lot more special than the WRX or even the STI, it was a forged unit capable of much more HP without internal modifications. The Evo has traditionally been easier to get more HP out of than the subaru engines.

Overall, I think you are overestimating what the subaru turbo engines are capable of, especially considering where the N20 is already at in terms of dyno numbers.