[conradb58]

Hello all ,

I was curious to as how much HP a stock B58 motor can actually handle before reliability starts to suffer ? I'm saving for the Big Boost Stage 3 turbo kit and would like to know the necessary precautions etc. Any Instagram or YouTubers that I can chime in to ?

Btw I'm moving to Germany in July so yes I'll be able to use all of it

[F30MGM]

Originally Posted by conradb58

Hello all ,

I was curious to as how much HP a stock B58 motor can actually handle before reliability starts to suffer ? I'm saving for the Big Boost Stage 3 turbo kit and would like to know the necessary precautions etc. Any Instagram or YouTubers that I can chime in to ?

Btw I'm moving to Germany in July so yes I'll be able to use all of it

Originally Posted by conradb58

Hello all ,

I was curious to as how much HP a stock B58 motor can actually handle before reliability starts to suffer ? I'm saving for the Big Boost Stage 3 turbo kit and would like to know the necessary precautions etc. Any Instagram or YouTubers that I can chime in to ?

Btw I'm moving to Germany in July so yes I'll be able to use all of it

HPFP needs upgrade if you're looking to run high HP.
Transmission is good for sub 400 ft lb of torque per spec but can be upgraded to ZF8HP70. You currently have the zf8hp50 or zf8hp51.

[JD11937]

Originally Posted by conradb58

Hello all ,

I was curious to as how much HP a stock B58 motor can actually handle before reliability starts to suffer ? I'm saving for the Big Boost Stage 3 turbo kit and would like to know the necessary precautions etc. Any Instagram or YouTubers that I can chime in to ?

Btw I'm moving to Germany in July so yes I'll be able to use all of it

People are making 500-600whp and in some cases more on the stock motor with only turbo/fueling upgrades. I'm waiting on a turbo upgrade and daily drive my car and will be looking to be in this range. You also have to consider how you drive your car and it's effect on different parts.

[conradb58]

Originally Posted by F30MGM

HPFP needs upgrade if you're looking to run high HP.
Transmission is good for sub 400 ft lb of torque per spec but can be upgraded to ZF8HP70. You currently have the zf8hp50 or zf8hp51.

Dorch Stage 2 when that time comes

[conradb58]

Originally Posted by JD11937

People are making 500-600whp and in some cases more on the stock motor with only turbo/fueling upgrades. I'm waiting on a turbo upgrade and daily drive my car and will be looking to be in this range. You also have to consider how you drive your car and it's effect on different parts.

There's this YT channel called Four Door Supra that has this kit but I'm not sure where things are currently at as his last upload was 2months ago

[SC_B5X]

Originally Posted by F30MGM

HPFP needs upgrade if you're looking to run high HP.
Transmission is good for sub 400 ft lb of torque per spec but can be upgraded to ZF8HP70. You currently have the zf8hp50 or zf8hp51.

I haven't seen any of the high HP guys upgrading their transmission. Pretty sure I only seen one guy upgrade his with a 8 speed from a diesel F30 because his trans failed and dealer wouldn't cover it.

[kern417]

Just send it bro.

[jbb2388]

As has already been said, many guys are reliably making over 500whp with turbo and fuel pump upgrades. The entire drivetrain is practically bullet proof from all I've seen and read here and elsewhere.

[mike@x-ph.com]

Cary Jordan posted a dyno this week with Pure turbo + meth and 93 octane. Made 477 whp / 494 wtq on a mustang dyno which is about 563 whp / 573 wtq on a Dynojet

[conradb58]

Originally Posted by mike@x-ph.com

Cary Jordan posted a dyno this week with Pure turbo + meth and 93 octane. Made 477 whp / 494 wtq on a mustang dyno which is about 563 whp / 573 wtq on a Dynojet

Those are amazing numbers.

[Wires]

Part of it is how often you use the power, and how harsh it engages. Most failures are the sharp snap, vs gentle engagement.

Even if you are putting down 500HP, you're not doing that all the time. Autobahn or not, power will be vastly less under most conditions.

Failures usually happen when you decide you want to know what 500HP feels like, you generate a bunch of wheel spin, and then tire(s) decide to grab and that shock goes through the drivetrain.

[les anderson]

Originally Posted by Wires

Part of it is how often you use the power, and how harsh it engages. Most failures are the sharp snap, vs gentle engagement.

Even if you are putting down 500HP, you're not doing that all the time. Autobahn or not, power will be vastly less under most conditions.

Failures usually happen when you decide you want to know what 500HP feels like, you generate a bunch of wheel spin, and then tire(s) decide to grab and that shock goes through the drivetrain.

Says who? This is subjective nonsense.

[kern417]

Originally Posted by les anderson

Says who? This is subjective nonsense.

How is it subjective? Shock is what breaks components. That's why making big power with a bigger turbo is generally safer than stock, because you're minimizing the torque spike.

[Wires]

Tell you what, want me to supply the direct number of my buddy who blew up his front CV joints in his ATV multiple times when this exact scenario happened?

I'm not saying this is THE ONLY reason you have a failure, but like a using a fishing rod, if things don't flex to absorb shock, they break. Ever watch a planes wing "flap" during turbulence? If they didn't, it they would snap.

[awilki0101]

Originally Posted by les anderson

Says who? This is subjective nonsense.

My drive shaft would beg to differ

[les anderson]

OP seems to be asking about high HP and engine reliability specifically. Maybe I interpreted his post too literally, but the drive shaft isn't part of the engine.

My point is that if you look at tuned b58s that have failed, there seems to be little data that shows it happens in a spectacular fashion under high load/stress. I don't think I have heard about one failure at the track, or even happening when the car is being pushed hard.

If you look at m3 spun crank hubs there is a recipe that almost guarantees it will happen. b58 has no such issue that I am aware of.

[marcthedark]

And abuse will kill a stock car just as well. Tuning get's your safety margins slimmer and slimmer and at one point you are over the line.
And to be honest a German Autobahn at 2am (aka no traffic) might be "high risk" as you could go for a vmax run and have it floored for 20 miles flat > stress that you would never tun into in the US.
But a good tuning company should be able to give you a reliable big turbo B58 that can survive this. But not every company can...

[conradb58]

Originally Posted by les anderson

OP seems to be asking about high HP and engine reliability specifically. Maybe I interpreted his post too literally, but the drive shaft isn't part of the engine.

My point is that if you look at tuned b58s that have failed, there seems to be little data that shows it happens in a spectacular fashion under high load/stress. I don't think I have heard about one failure at the track, or even happening when the car is being pushed hard.

If you look at m3 spun crank hubs there is a recipe that almost guarantees it will happen. b58 has no such issue that I am aware of.

That's exactly what I'm asking. Everyone upgrades the motor & trans but what about everything else ? The overlooked components that can break as well.

[JD11937]

Originally Posted by awilki0101

My drive shaft would beg to differ

Damn, that's not pretty. What car? What do you have done to your car? I haven't heard of anyone else losing a driveshaft even with upgraded turbos.

[awilki0101]

Originally Posted by JD11937

Damn, that's not pretty. What car? What do you have done to your car? I haven't heard of anyone else losing a driveshaft even with upgraded turbos.

340 xdrive. MG Flasher E30 tune, BMS intake, ER catless DP, Remus exhaust, KW V2 coilovers. Was on a launch. Grabbed real hard then heard an awful noise. Did a full 360 twist on drive shaft and ripped it from diff. Pretty sure it was a once in a lifetime occurrence. I hope anyways.

[JD11937]

Originally Posted by awilki0101

340 xdrive. MG Flasher E30 tune, BMS intake, ER catless DP, Remus exhaust, KW V2 coilovers. Was on a launch. Grabbed real hard then heard an awful noise. Did a full 360 twist on drive shaft and ripped it from diff. Pretty sure it was a once in a lifetime occurrence. I hope anyways.

Damn, sorry to hear that. How was the replacement?

[awilki0101]

Originally Posted by JD11937

Damn, sorry to hear that. How was the replacement?

Expensive ha. Shop did a good job. Just took some time to get a new one shipped in. When it came off it also hit the gas tank and possible damaged a sensor so fuel level gauge also wouldn't work. BMW luckily replaced entire tank under warranty