[Chefcg1]

For all you guys out there with RB turbo's what kind of gains are you seeing over stock twins? What peak boost can you run with supporting mods? I'm just at a point that I need to decide do i wait for the big single turbo and rent a car for a while or do I pull the trigger and just go with the RB's.
Thanks for any insight on this.

[Brey335i]

There are so many threads documenting the gains with RB turbos.

Expect 500 whp on meth max I would say.

[cleex024]

i would like to see some turbos that make 500 whp without meth

[benzy89]

Originally Posted by cleex024

i would like to see some turbos that make 500 whp without meth

Then you're looking at a single-turbo or heavily modded twin turbo (ASR/RB turbos, upgraded internals -- cylinder head, rods, pistons, etc).

500 WHP on an TT N54 wouldn't be difficult, just expensive

[rdeterman]

Originally Posted by benzy89

Then you're looking at a single-turbo or heavily modded twin turbo (ASR/RB turbos, upgraded internals -- cylinder head, rods, pistons, etc).

500 WHP on an TT N54 wouldn't be difficult, just expensive

as far as i know there is no "upgraded internals" available for the N54

[Lulz_M3]

Originally Posted by rdeterman

as far as i know there is no "upgraded internals" available for the N54

There's a few guys with built motors running around...

[Dr. G]

Don't just look at peak whp numbers.

Look at a dyno from a stock turbo n54, it heats peak WHP and then it dies down very fast. A lot of upgraded turbos hold that power till redline a lot better.

[cleex024]

i dont understand why you would need upgraded internals when you can run singles up to like 24 psi with stock internals.

please inform me how that works...im not being a smart ass i just really dont know.

[cleex024]

are there any bigger twins out there? i would love to see the biggest twins you can fit under ours

[Chefcg1]

From what I've read and from a comment that Rob Beck made himself, the main reason we are only seeing 500hp max cars with his turbo is because are map sensor is locked to 21psi. So that begs the question if we upgrade the map sensor like Shiv has done with the big single turbo, what would be the max boost one could run and still stay with in the compressor maps efficiency? I haven't seen a compressor map with what RB has modified the turbo's too.

[OpenFlash]

With the single, your engine will make more power, operate at lower exhaust back pressure levels, sound a lot nicer (6 pulses vs two 3 pulse merge) and be a lot less sensitive to heat soak/octane. And if you opt for the 58mm turbo, you should still be able to hit 600whp and have spool up similar to upgraded twins. It will also cost more. But you will be getting a lot more hardware and performance. So it really just boils down to personal preference.

The map sensor was not the limiting factor in terms of max power for upgraded twins. If anything, it just limited midrange torque. The turbo hardware itself appears to be limited to 500-520whp. Either due to turbine housing restriction and/or inlet pipe restriction. A new MAP sensor won't help you with that.

Shiv

[Chefcg1]

Originally Posted by shiv@vishnu

With the single, your engine will make more power, operate at lower exhaust back pressure levels, sound a lot nicer (6 pulses vs two 3 pulse merge) and be a lot less sensitive to heat soak/octane. And if you opt for the 58mm turbo, you should still be able to hit 600whp and have spool up similar to upgraded twins. It will also cost more. But you will be getting a lot more hardware and performance. So it really just boils down to personal preference.

The map sensor was not the limiting factor in terms of max power for upgraded twins. If anything, it just limited midrange torque. The turbo hardware itself appears to be limited to 500-520whp. Either due to turbine housing restriction and/or inlet pipe restriction. A new MAP sensor won't help you with that.

Shiv

Thanks for the input. So when are we going to see pricing on your units? 1 week,...1 month?

[cleex024]

thanks shiv for the insight...are all those figures with meth or without because i only care about no meth figures as i do not want to run meth.

also i wanna know how much the single turbos are gonna cost and what the life expectancy is going to be on the singles.

what can i expect the big single to do hp wise without meth?

[benzy89]

Originally Posted by rdeterman

as far as i know there is no "upgraded internals" available for the N54

Here's a picture of VAC Motorsports Stage 1+ Cylinder Head


They're currently working on a Race Spec Cylinder Head (was at the shop 2 weeks ago). VAC also is selling CP forged pistons & Carrillo connecting rods. I haven't heard of anyone offer upgrade cams or crankshafts yet. Prob a matter of time issue with the single-turbo conversion being released to the masses.

Originally Posted by cleex024

thanks shiv for the insight...are all those figures with meth or without because i only care about no meth figures as i do not want to run meth.

also i wanna know how much the single turbos are gonna cost and what the life expectancy is going to be on the singles.

what can i expect the big single to do hp wise without meth?

These are all very subjective questions. Obviously a turbo that's babied (daily driven, car well maintained, etc) is going to last a lot longer than a turbo that's abused. FBIS hit 650 RWHP on 94 octane + meth, so drug free you'll probably see high 500/low 600 WHP

http://www.e90post.com/forums/showpo...98&postcount=1

[jippii ensio]

Originally Posted by Chefcg1

For all you guys out there with RB turbo's what kind of gains are you seeing over stock twins? What peak boost can you run with supporting mods? I'm just at a point that I need to decide do i wait for the big single turbo and rent a car for a while or do I pull the trigger and just go with the RB's.
Thanks for any insight on this.

The peak boost depends on your MAP sensor. You should limit your boost to no more than 21psi, if you are running the stock MAP sensor. You could run a couple of psi more with upgraded sensor.

The gains are directly related to the rpm. Again, running with stock TMAP you will reap 100+whp gains beginning from 6200 - 6300 RPM, with upgraded TMAP sensor the 100+ WHP gains begin from lower RPM.

[ichi_ban]

Originally Posted by Chefcg1

Thanks for the input. So when are we going to see pricing on your units? 1 week,...1 month?

I second, third, forth, fifth this.

[Glowin]

So RB turbos can't be run without meth?

From Dzenno's post (his second dyno done on March 2, 2011), it seems he's getting on PUMP GAS (94 Sunoco) - NO METH - 16psi - 450whp? No? And that's on the RB turbos without meth, right?

For someone who knows roughly off the top of their head, what would be the WHP numbers in the following configuations? No meth.

Stock - mid to high 200's
FBO - ?
FBO + RB - ?

[ichi_ban]

You can run RB turbos without meth.

FBO - I would say about est. 350hp
FBO+RB - est. 450hp + meth = 500ish

[themyst]

Originally Posted by Glowin

So RB turbos can't be run without meth?

From Dzenno's post (his second dyno done on March 2, 2011), it seems he's getting on PUMP GAS (94 Sunoco) - NO METH - 16psi - 450whp? No? And that's on the RB turbos without meth, right?

For someone who knows roughly off the top of their head, what would be the WHP numbers in the following configuations? No meth.

Stock - mid to high 200's
FBO - ?
FBO + RB - ?

440-450 whp on 93 octane seems feasible. Keep in mind though power will tail off quicker than if you had water injection simply because you will heatsoak on sustained pulls even with an upgraded FMIC. The RBs will be a bit more less susceptible to heatsoaking than stock turbos though.

[GOTMH8N]

Originally Posted by TeamSoloE93

You can run RB turbos without meth.

FBO - I would say about est. 350hp
FBO+RB - est. 450hp + meth = 500ish

my friend in his stock 335i 6spd with DCI and JB4 just put down 380whp/420tq on a Dyno Jet today...

[themyst]

Originally Posted by GOTMH8N

my friend in his stock 335i 6spd with DCI and JB4 just put down 380whp/420tq on a Dyno Jet today...

on pump gas? baseline?

[GOTMH8N]

Originally Posted by themyst

on pump gas? baseline?

93oct/E85 on Map 5. no baseline however; he said he could care less about a baseline number