[wj4]

I'm curious to see who will be the first one to convert the twin turbo to a single turbo set up, a la the Supra.

Like stated, upgrading the turbos is not just simply slapping on bigger ones. With bigger turbines in, you need to increase the air flow so that means you need a new intake, turboback, exhaust manifold or at least port the OEM one, I don't know about the injectors in this case, in my old car, we would upgrade the stock 560cc to 660cc or 720cc, and a Walbro fuel pump (the regular fuel pump, not the Hi flow one that is on back order).

[judec]

Originally Posted by wj4

I'm curious to see who will be the first one to convert the twin turbo to a single turbo set up, a la the Supra.

It will be some performance freak not appreciating the lack of turbo lag... But it will need so much funds to transfer the car it would be easier to wait for the upcoming M3.

Imho the 335i has it's own personality and purpose. S/t like this would destroy it completely.

[BoostedBMW]

I'm not sure why you would want to convert over to a larger single when there is a huge range of larger ball-bearing twins that you could go with that would provide plenty of flow over stock and spool almost as fast. Just my opinion though. I'm not sure how much clearance this car even has for turbo upgrades.

[chris b.]

[grkm3]

Someone already has bigger turbos and a new intake on a 335 over at 6speed forums,along with a full exhuast

[Terry335]

I just want better flowing stock size turbos that are easy to install and pickup 30-40hp @ 15psi.

[hotrod2448]

I would like to see a complete upgrade with all supporting mods capable of @450-500whp. I'm sure it can be done with a livable amount of lag given the displacement, fully variable valve timing, direct injection these cars have.

I'm not sure if it would be done best with one fairly large single turbo or two medium sized ones though. It would definitely be cheaper to do it with a single if packaging permits, probably easier as well since you wouldn't have multiple wastegates and things like that to tweak.

If it was the Japanese market turbos kits would probably be out now. For some reason it seems the euro tuner market moves way slower though.

[zenmaster]

Originally Posted by hotrod2448

I would like to see a complete upgrade with all supporting mods capable of @450-500whp.

I would like to see a complete upgrade capable of 550-600whp.

[Spool]

Larger turbos would be great...for power

however, if you switch out ur twins, and run a single larger turbo...you'll lag like crazy, that might be annoying...and the car will have traction issues when the turbo fully spool...and our cars will become highway queens like the Supras...

400, 500, 600rwhp...we're all gonna run 12's...

Would need to get a full kit, Larger turbos, larger intercooler, high flow injectors, DEFINITELY a better fuel pump...software and lots of tuning..

it'll be expensive

[wj4]

Originally Posted by judec

It will be some performance freak not appreciating the lack of turbo lag... But it will need so much funds to transfer the car it would be easier to wait for the upcoming M3.

Imho the 335i has it's own personality and purpose. S/t like this would destroy it completely.

+1 on the turbo lag. I love this car because at 1K rpm, it has enough power/torque to get moving. In my old car, at 1K rpm, the car would be shuddering on the verge of stalling and boost doesn't fully spool until 4k RPM.

I'm sure someone or some shop will do it for the wow factor though.

[hotrod2448]

You'll have massive lag if you go over board like the 1000hp Supra guys. If you have reasonable goals (@450whp) I think the car will still be very drivable. There will definitely be more lag than stock but, nothing like the mega high HP supra guys.

I don't get why Spool thinks we'll keep running 12's regardless of power. Surely if you are going to do a turbo kit you'll have an LSD and probably drag radials for the strip.

[chbrules]

Just get another turbo like BMW's and make it a tri-turbo

One per every cylinder pair.

[DEMENTEch335i]

Originally Posted by scalbert

I wonder how much boost this engine will be able to handle with the direct injection. I thought the Audi 2.7t had a high CR at 9.3:1. However, people have been able to run nearly 30 PSI (taper to about 26 PSI) on the stock CR. With the benefit of direct injection, I am guessing 20 PSI may be possible with upgraded snails. Cooling may be another matter and we will need to see what the outcome is there.

That said, I wouldn't be surprised to see some turbo upgrade kits producing 400 - 450 reliable WHP in about two years. For me, and I say this now (seems I always go back on my word when it comes to modifications on my vehicles), I will be happy with 350 WHP. I have had more and just could not use it for my typical commute. But it sure is nice to have when the chance comes to use it.

Engines do not handle psi boost!! , engines handle HorsePower!! and I will be happy too if this n54 engine was able to handle at least 400whp.

[scalbert]

Originally Posted by DEMENTEch335i

Engines do not handle psi boost!! , engines handle HorsePower!! and I will be happy to if this n54 engine was able to handle at least 400whp.

I am not sure what you are saying but engines technically handle torque or the combustion pressures every cuycle. Boost effectivey increases torque.

[Terry335]

I'll say this. I took the diaper off the car today to look at air intake ideas, and there is not much room there. The only option I see is a reworked stock turbo, and maybe a custom downpipe. The air intake from the turbo to the air box is going to be an issue also.

[DEMENTEch335i]

Originally Posted by scalbert

I am not sure what you are saying but engines technically handle torque or the combustion pressures every cuycle. Boost effectivey increases torque.

Like you said engines handle TORQUE & horsepower!! , But you cant know for sure how many boost a engine can handle because in the same way that you can have (For Example) 350Whp.@20Psi.boost , you can have 280Whp.@20Psi.boost!!
It's not how many Boost , it's how many Hp!!

[scalbert]

Originally Posted by DEMENTEch335i

Like you said engines handle TORQUE & horsepower!! , But you cant know for sure how many boost a engine can handle because in the same way that you can have (For Example) 350Whp.@20Psi.boost , you can have 280Whp.@20Psi.boost!!
It's not how many Boost , it's how many Hp!!

Sounds like we are splitting hairs here.

[cadbimmer]

we need someone to upgrade the guts of the turbos. ala tdctuning and the modified vf40 legacy turbos. then just run meth injection. exhaust and tune and you should be close to 400whp.

[zenmaster]

wheelB (Ben) reported this morning they have the 335i running 18lbs from the bigger turbos and a manual boost controller. Also has full custom exhaust and down pipe. Dyno #'s will be forthcoming. My guess is > 410whp.

[paulGT3]

Zenmaster I dont know much about the BMW motors- mostly 911 motors
The turbo motors have stronger internals and can handle more. The NA motors dont. So you have to spend lots of money for 30 extra HP on a NA motor say on a 911S(not including Supercharging) where as just a flash of the ECU on a TT gets you a quick 80-100 HP-same for turbo diesels.

[zenmaster]

Originally Posted by paulGT3

Zenmaster I dont know much about the BMW motors- mostly 911 motors
The turbo motors have stronger internals and can handle more. The NA motors dont. So you have to spend lots of money for 30 extra HP on a NA motor say on a 911S(not including Supercharging) where as just a flash of the ECU on a TT gets you a quick 80-100 HP-same for turbo diesels.

I understand that HP-making aspect. About 10 years ago I added a little over 130 HP to my '93 RX-7 with some extensive mods. The mods included a replacement ECU, mainly to get a better air-fuel map. Interestingly, the boost was only raised 1 psi! Damn it was expensive, but fun - and a learning experience. A 2800lb car running 320whp. For perspective, this would be the equivalent of a 3550lb 335i making 480hp. Which, for more perspective, was close to, but still not quite as fast as a stock Dodge Viper of the time.

BTW, with just chip, catback, air box I got 30 extra HP out the e34 540i w/ NA M62B44 that was traded in for the 335i. What's funny is my daily commute is now averaging 1 mpg less with the 335i. But that 540i weighed the same as the 335i, and produces about the same HP, coincidentally.

Wouldn't the S54 have a little more turbo potential than the purpose-built turbo-intended N54, simply because it is a stronger engine?

[Snow White]

Coming from the mustang scene, I have an 03 cobra that has been fully rebuilt basically from the ground up. New motor all internals redone, new tranny, return style fuel system, new solid axel whipple supercharger blah blah blah... I'm looking into getting the 335 because its the type of car where you dont need a ton of power to have fun driving it. Changing out the turbos on this car seems like its going to be a ton of money and you guys are talking about 400 to 450 whp. If your looking at making power I suggest going out and buy something like a cobra heck for $1000 you can make over 500rwhp no problems with just a tune pulley and exhaust. My current set it is only on 13lbs right now and it makes well over 500rwhp. I am selling the car because I'm moving into a new house. The car is built to handle more then 1000rwhp with no problems, but I do daily drive the car and its almost scary to drive now espually in the rain. Changing the fuel system in a mustang is a lot easier then in the bmw at least it would seem that way dealing with all the electronics. If your looking to build something for tons of hp why not build something like a supra or mustang a bmw was made to enjoy not to run 9's down the drag strip. By the way my cobra is for sale asking 35k lol.