[Jeef]

My 335 is converted with all genuine BMW parts.

-m3 rear quarters

-carbon roof

-hood, sideskirts, front fenders

-m3 front bumper(no need for headlights if you are e92)

-custom rear bumper to have 335is diffuser.

Had the OEM setup for a little while then ended up chopping the m3 quarters and going slightly wider. Should have just kept it OEM m3 quarters... lol.


i did m3 control arms front and rear besides the rear camber/toe arm. went with solid shock mounts for top and bottom of rear shock. Still deciding on the diff/rear end setup.

[Vulcan50]

I feel like the price on half that stuff from bmw would cost more than a M3 with a blown motor.

I guess a good question at this point is what make the N54 swap so expensive? You can buy a 335i for $5-8k all day. And everything should bolt up, so no paying for custom fab. Is it just a matter of the DME at this point?

Heck you could sell off the s65 bits and 335i stuff that wouldn't be used and probably recoup $5k.

[KnighTT]

My wonder was always would the 335xi subframe just bolt right in?

Is the M3 body itself just modified for different quarters or is the entire floor pan different?

[Saif2018]

Originally Posted by nicky dj

A supercharger relying on the crankshaft to produce forced induction. While you can get 600 possibly 700hp to the wheels, the torque is still relatively lower at maybe 550 max. You'd have to google the numbers of some builds.

Turbos rely on themselves via the exhaust gas to produce the forced induction. The bigger the turbos the more you can crank out, hence the turbo wars you see now between car manufacturers. Not low end horsepower but overall torque.

A Supercharger is always on boost, which means zero lag, lack of torque shouldn't be an issue low down, even if a N54 can make more torque low down. S65 revs to 8k, and super responsive. Big turbos = more lag.

There's always upside/downsides to Supercharging Vs Turbo Charging.

Is there any builds with Fully Forged S65 engine with Supercharger?

Would be interesting to see how much power/torque they can make.

[nicky dj]

Originally Posted by Saif2018

A Supercharger is always on boost, which means zero lag, lack of torque shouldn't be an issue low down, even if a N54 can make more torque low down. S65 revs to 8k, and super responsive. Big turbos = more lag.

There's always upside/downsides to Supercharging Vs Turbo Charging.

Is there any builds with Fully Forged S65 engine with Supercharger?

Would be interesting to see how much power/torque they can make.

Not sure, find me a fully forged one? Might as well bore it out and increase displacement while you're at it. That's asking OP to do something wild and probably not worth the cost IMO.

[Torgus]

Originally Posted by nicky dj

Not sure, find me a fully forged one? Might as well bore it out and increase displacement while you're at it. That's asking OP to do something wild and probably not worth the cost IMO.

775hp 555tq is the highest s65 SC dyno i have seen from Gintani.

If you increase displacement the block can't handle boost well. No reason to stoke it unless you have to stay NA for some reason. Stroker kits are fucking expensive to boot.

[nicky dj]

Originally Posted by Torgus

775hp 555tq is the highest s65 SC dyno i have seen from Gintani.

If you increase displacement the block can't handle boost well. No reason to stoke it unless you have to stay NA for some reason. Stroker kits are fucking expensive to boot.

Ditto.

[Saif2018]

Originally Posted by nicky dj

Not sure, find me a fully forged one? Might as well bore it out and increase displacement while you're at it. That's asking OP to do something wild and probably not worth the cost IMO.

Haven't seen one myself but yeah your right, if money isn't so much a concern.

Trying to get a N54 in a M3 body isn't gonna be cheap either.

Supercharging S65 is much cheaper in comparison and I've seen some with about 600bhp and more than enough torque. Didn't hear about anyone complaining about lack of torque.

[Vulcan50]

I'm sorry but what makes the N54 swap so expensive?

Everything would be bolt on. It would come down to the DME. People swap LS1s into this and older chassis, that's 100% custom.

So again what is so expensive?

[Saif2018]

Originally Posted by Vulcan50

I'm sorry but what makes the N54 swap so expensive?

Everything would be bolt on. It would come down to the DME. People swap LS1s into this and older chassis, that's 100% custom.

So again what is so expensive?

Well if the owner has a E92 M3, then fitting a Supercharger kit himself would be much cheaper than buying a donor car or N54 engine.

[Torgus]

The only reason to n54 swap would be if you have a fully built n54. Roughly 15k. Then add a single turbo kit 5k. Then add a clutch 1700. Add fuel system for 3k. Intercooler + pcv upgrades another 1k.

It is not like upgrading an n54 past say 600whp is cheap.

[Vulcan50]

High mileage m3s are $20-25k, so add $8k for the SC, it's still way more.

At this point let's assume money is no object. The cost is irrelevant, what is the custom side to make it work? Basically what can't just be swapped over? DME?

[Saif2018]

Originally Posted by Vulcan50

High mileage m3s are $20-25k, so add $8k for the SC, it's still way more.

At this point let's assume money is no object. The cost is irrelevant, what is the custom side to make it work? Basically what can't just be swapped over? DME?

In the US probably,

I was thinking Supercharger kit would be cheaper, just double checked.

Can get a E92 M3 between 16k in uk and N54 335i around 6-10k depending on condition.

Thats a fair bit of money, almost 26k to have a N54 swapped E92 M3, assuming owner does all the work.

Just had a look at Supercharger kit for S65 is 8-10k

At this point it just isn't worth doing either, unless S65 is already owned.

Since both about the same cost, better to supercharger route, since you'll get at least 600bhp straight off after conversion, and zero lag. Whereas n54 conversion plus stage 2 turbos plus boltons, would be a lot more expensive.

I just had a look at autotrader and F80 M3 is around 25-30k in UK.

[Torgus]

Originally Posted by Vulcan50

High mileage m3s are $20-25k, so add $8k for the SC, it's still way more.

At this point let's assume money is no object. The cost is irrelevant, what is the custom side to make it work? Basically what can't just be swapped over? DME?

I don't see how it is way more? An n54 swapped m3 is worth less than an s65 m3 to almost everyone. Myself included.

Every module might have to be swapped or recoded to start. 335i front subframe. Swap the gauge cluster and code it. Custom driveshaft. Assuming you have the skill to do that all on your own and have no codes and can pass inspection, congrats.

You are basically downgrading the m3 at the end of the day. 99% of the people who see the hood open will assume it is just a 335i with m3 parts.

[Vulcan50]

A Stg 2 FBO N54 is about $5500 in parts. A rear ended 335i about $3500, a blown s65 m3 about $10-12k so about $20k. A high mileage S65 m3 (decent condition otherwise) around $20k, plus $8k for the SC plus say $1k for refreshing the motor. You're nearly $10k more right off the bat. And you are safe to figure the Stg 2 will put about 650/650 down.

So gain cost aside what would need to be done that isn't transferring the stock bits and FOB bits over?


What modules need switched/recoded

[Jeef]

You probably need the CAS and DME from donor n54. From there you can try coding in the rest to make work. At least you'll have m3 steering rack and all the m features if setup properly. I've seen some people add euro MDM mode to their 335 too.

All the time and money into swapping I think you can make your 335 look exactly like an m3 for slightly cheaper and less headaches? All your wiring would be done already and no need to swap anything except body parts unless you want full m3 suspension as well.

So many options!

[Vulcan50]

Swapping the N54 would only require a custom drive shaft. I think a lot of you underestimate the cost of body work. Just for the exterior to match you are looking at $10-12k in paint/body. Now all the suspension bits and LSD, another $3k. Add the interior stuff probably $3k. So were around $18k in an aesthetic conversion.

The swap alone would be like $5k less and you would be allowed to rock the ///M3 badging, priceless

[nicky dj]

Originally Posted by Vulcan50

Swapping the N54 would only require a custom drive shaft. I think a lot of you underestimate the cost of body work. Just for the exterior to match you are looking at $10-12k in paint/body. Now all the suspension bits and LSD, another $3k. Add the interior stuff probably $3k. So were around $18k in an aesthetic conversion.

The swap alone would be like $5k less and you would be allowed to rock the ///M3 badging, priceless

Is the M3 DCT transmission an issue at all with the N54?

[Vulcan50]

From what I read, no. There's coding and stuff but my understanding is physically it's the same as the 335is DCT, except for like 2ports for something

[Vulcan50]

There's something to do with matching the diff to the tranny M3/M3 and 335is/335is