[Ceros15]

Stock trans is really what’s going to limit you in your build, keeping the torque under 750 will keep it safe but you won’t be maximizing the turbo/other parts yet. Might be worth getting a pure trans before the 3.5L motor

[2Times]

Originally Posted by Ceros15

Stock trans is really what’s going to limit you in your build, keeping the torque under 750 will keep it safe but you won’t be maximizing the turbo/other parts yet. Might be worth getting a pure trans before the 3.5L motor

Agreed, you're totally correct... already spoke to RK about it and it will be a very fast turn-around with it planned accordingly.

[G30M]

Originally Posted by 2Times

Agreed, you're totally correct... already spoke to RK about it and it will be a very fast turn-around with it planned accordingly.

is that a DCT?

[2Times]

Originally Posted by g21

is that a DCT?

Nope... ZF 8 speed... same/similar trans as the M5 I believe.

[G30M]

Originally Posted by 2Times

Nope... ZF 8 speed... same/similar trans as the M5 I believe.

M5 trans also has a 750NM limit

[Adler11th]

For someone we to the scene, please explain the benefits/downsides of single turbo vs 2 turbos? Also why not 2 big turbos, or 3cyl would not spoil it enough in 1/4 mile?

[BadBoostedBMWM3]

I definitely think the 6870 is the sweet spot with the bigger hot side on the 3.0 L, but, talk to me about the 3.5 L? If I were gaining that replacement, then I would go 7275 as well.

What the available options to stroke/bore the s58?

[2Times]

Originally Posted by Adler11th

For someone we to the scene, please explain the benefits/downsides of single turbo vs 2 turbos? Also why not 2 big turbos, or 3cyl would not spoil it enough in 1/4 mile?

The fastest M3s are all single turbo, just depends on goals. Hybrid or even the BigBoost (twin full frame) kits are less expensive. You can make 1000hp with hybrid twins.

Originally Posted by BadBoostedBMWM3

I definitely think the 6870 is the sweet spot with the bigger hot side on the 3.0 L, but, talk to me about the 3.5 L? If I were gaining that replacement, then I would go 7275 as well.

What the available options to stroke/bore the s58?

There will be a few options in the near future… I’m sure some of these will be setting records very soon. I’m not familiar with all of the options just yet

[G MONEY]

Originally Posted by g21

nah, anti lag

I’m team rolling boost. I have never felt a car pull so hard when doing it. The GTR just takes the fuck off!! It’s addicting.

[2Times]

Wrapping it up… it’s a piece of art.
It will be on the dyno Sunday

[Blue Angel]

Subscribed. Looking great!

[G30M]

Originally Posted by G MONEY

I’m team rolling boost. I have never felt a car pull so hard when doing it. The GTR just takes the fuck off!! It’s addicting.

wait ... they're the same thing?

[G30M]

Originally Posted by Adler11th

For someone we to the scene, please explain the benefits/downsides of single turbo vs 2 turbos? Also why not 2 big turbos, or 3cyl would not spoil it enough in 1/4 mile?

i believe 1 big turbo gives better top end power along with 1 big everything

i don't know if you can put 2 big turbos (that means you need 3 cylinders to drive each turbo, not enough), not to mention no space to fit all the other bits like intercooler etc

[a5m]

Does it sound any better

[Blue Angel]

Originally Posted by a5m

Does it sound any better

Legitimate question!!! I’ve heard several M3s in person with exhaust that sound like crap. Loud AF, but still crap.

I’m no Supra expert, but generally speaking the single turbo Supras (real 90’s Supras) I’ve heard in videos sound great! Is there a firing order difference or something, or does the single turbo conversion smooth it out?

If a modern M3 could sound like an old school single turbo Supra, the sound alone would be worth the conversion.

[G MONEY]

Originally Posted by Blue Angel

Legitimate question!!! I’ve heard several M3s in person with exhaust that sound like crap. Loud AF, but still crap.

I’m no Supra expert, but generally speaking the single turbo Supras (real 90’s Supras) I’ve heard in videos sound great! Is there a firing order difference or something, or does the single turbo conversion smooth it out?

If a modern M3 could sound like an old school single turbo Supra, the sound alone would be worth the conversion.

Man. Talk about 2 worlds apart. I would be happy if BMW could make an M3/4 sound a 1/4 as good as those Supras. Instead, we get a chainsaw on steroids

[static_void]

Originally Posted by a5m

Does it sound any better

Yes. So much better. Literally cannot overstate how much the sound profile changes and upgrades compared to running twins. Not to mention the turbo spool noises when the car is headed your way...

[2Times]

Originally Posted by a5m

Does it sound any better

I will make video clips and use my dedicated microphone to capture the sounds.
I did that when I got the BoostLogic exhaust and will try to do something similar

[SwankPeRFection]

I know it’s not the “cool” thing to do, but you really need a filter on that thing. You’d be surprised how much shit will get in and contaminate your engine without one. Expect silicon to go up substantially in oil analysis content and to also develop issues with that turbo if you drive it hard and a lot of miles. It’s just not worth it in my opinion. Find a way to make something work.

[forcefed]

Originally Posted by SwankPeRFection

I know it’s not the “cool” thing to do, but you really need a filter on that thing. You’d be surprised how much shit will get in and contaminate your engine without one. Expect silicon to go up substantially in oil analysis content and to also develop issues with that turbo if you drive it hard and a lot of miles. It’s just not worth it in my opinion. Find a way to make something work.

Totally agree, if that turbo was $500 i wouldn't care but those things aren't cheap, dust/sand is everywhere. https://burgertuning.com/products/bm...ant=4366621507

[SwankPeRFection]

Originally Posted by g21

i believe 1 big turbo gives better top end power along with 1 big everything

i don't know if you can put 2 big turbos (that means you need 3 cylinders to drive each turbo, not enough), not to mention no space to fit all the other bits like intercooler etc

Pretty much correct. There’s simply not enough exhaust volume to move two larger turbos, depending on size of course. A nice broad power range will always give the best speed gain and time, so you have to figure out how much low end you’re willing to give up and how much rev range will be left over for power production for whatever you’re putting in. This is why an appropriate single setup on the S58 should include a properly designed twin scroll manifold and turbo to go with it. You’ll spool better than a single bullshit vband mount with the same configuration. Exhaust housing size on the turbo will also help dial things around a little bit, but not much… we’re taking a few hundred RPM range move in the power bad vs peak power and sustainability. Usually you want to go with an AR that gives you power that doesn’t fall off to redline or just plateaus close to it, while also giving you the quickest response and most broad power band. If on the dyno you’re still climbing on the HP curve right up to redline and you don’t plan in the future to do something to the valve train to allow for a higher redline range, then your best bet is to drop down one exhaust AR housing size and see how that behaves in terms of moving your starting powerband lower in your rev range while not dropping off towards the top. That way you get the best of both worlds… good sustained peak power without too much of a ceiling and not too much lost down low in terms of spool and kicking in that turbo.

Now, the OP will in the future do a 3.5 stroker kit, which will add more exhaust volume and technically with the same configuration he has now, will see faster spool. If he’s prepared the existing turbo sizing for that now, because he doesn’t want to change any wheels or housings out when that happens, then technically the current setup will be slower spool, a narrower powerband and the turbo would look like it’s still got room up top to keep climbing power. When the new engine goes in, his existing powerband should broaden and if sized right, should fall inline with what I said earlier… ie lower power kickin with slightly plateaued HP output at the very top. But all they can be tailored again with inexpensive exhaust housing changes if the turbo manufacturer has allowed for it. Hope that helps.

[SwankPeRFection]

Originally Posted by forcefed

Totally agree, if that turbo was $500 i wouldn't care but those things aren't cheap, dust/sand is everywhere. https://burgertuning.com/products/bm...ant=4366621507

It’s not about the turbo as much as it is about the engine. All those dust particles will be pulled into the intake tract over time and at pressure, meaning the IC core will now get sandblasted and then all will end up in the cylinders during the combustion stages and sand blast all that up. It should technically be minor, but if you street drive the thing that shit adds up quick over even short mileage distances like 5-10K miles. I’d rather (if there’s room) lose a little power and filter out all that crap and drive it forever than not. You can change a turbo if you’re deep pockets like that, but do you wanna change engines or drive it forever? You can either just fuck… or you can fuck around and find out. The choice is always yours. Lol