[farbmw]

Good stuff! I will be watching, and calling you!!!

[qba335i]

Subscribed

[marv85]

Good stuff as always Dzenno! Keep us updated!

[richpike]

Originally Posted by GeorgiaTech335coupe

I hope this works out well for you, simply for the fact that it will keep the single turbo options a little more honest in pricing. Good luck.

Both are super exciting, and competition helps pricing and innovation!

-Rich

[jippii ensio]

So Cobb runs this already and you have ordered one? When are you going to install it yourself?

[dzenno]

Yes, Rob has it installed on his 335i, scaled and working. I've ordered mine and hopefully it'll be here soon but these are rare at any dealer right now, even Tischer where I ordered from, so I have no idea how long it'll take to get here...its going on the car as soon as I get it hooked up and get a map from Rob to test it with

[ChuckD05]

Sub'd

[R1000K3]

The Map sensor numbers can be a bit confusing. I guess in this case it reads 2.5 Bar turbo pressure (about 35 PSI), right?

[Lulz_M3]

Originally Posted by R1000K3

The Map sensor numbers can be a bit confusing. I guess in this case it reads 2.5 Bar turbo pressure (about 35 PSI), right?

About 36 psi. 1 bar is equal to atmosphere so it reads 2.5 bar.

[ar design]

Good stuff

[JStang]

If you can get the RB's to 500+ whp with pump gas I have a feeling Rob's sales are going to sky rocket because of this discovery. Seems much more cost effective than the single turbo option. Of course, this is all hopes and speculation at this point.

[Brey335i]

Originally Posted by JStang

If you can get the RB's to 500+ whp with pump gas I have a feeling Rob's sales are going to sky rocket because of this discovery. Seems much more cost effective than the single turbo option. Of course, this is all hopes and speculation at this point.

Yeah, but I still think one of the biggest downfalls is that we aren't able to build power to redline

[enrita]

On pump gas you are limited by the engine compression . There is no way to make 500whp without maybe modifying the exhaust manifold.

[JStang]

Originally Posted by Brey335i

Yeah, but I still think one of the biggest downfalls is that we aren't able to build power to redline

True that! Of course 500 HP is going to not only call for RB's but an LSD as well.

[rader1]

Originally Posted by Brey335i

Yeah, but I still think one of the biggest downfalls is that we aren't able to build power to redline

But isn't that more of a boost control issue rather than a limitation of the turbos? Based on the dyno charts/logs/discussions of Dzenno's I've seen it looks like the turbos are tapering more than requested. Idk if that's the turbo's fault or something else.

[dzenno]

Originally Posted by Brey335i

Yeah, but I still think one of the biggest downfalls is that we aren't able to build power to redline

I wouldn't necessarily call it a downfall...every turbo application behaves differently and has its advantages and disadvantages...choose a smaller turbo and you get next to instant spool sacrificing some of the top end, choose a big turbo and you sacrifice instant spool but get a great top end...all depends on what you prefer to drive, what your budget is, and what your appetite for destruction and unforeseen issues is with something unproven yet in terms of reliability of the overall package (not talking about turbo itself or engine itself, just overall screwing around with the car on a lift constantly with things to find out why this why that)..eventually with time the confidence level and actual real costs (on top of the full kit cost) associated will come to light and it'll be a more true representation just what this engine can/will do with any particular aftermarket turbo option out there and what is worthwhile and what costs $$$ and constant headache...

Don't listen to vendor propaganda, don't listen to pumped up enthusiasts who aren't running these or spending their hard earned cash on these and put the dyno numbers to the side a bit...wait until the cars are out on the road and people are driving with these kits like they should be driven and hopefully many of them will be fair and open enough with the community as I've been in the past with my mods, and actually share their experiences with us

I know that I've absolutely taken the car to hell and back with RB turbos and they're proving to be very reliable along with the power levels provided and current boost levels..with some more tuning we'll be at 500-520whp (maybe more, not counting on it) and right now I'm personally not planning on guineapigging another aftermarket kit but will be following very closely

If no one has been in an RB high boost car do yourself a favor and ask a local member for a ride...then set your power goals as they do come with many potential financial sacrifices many aren't ready to make and/or aren't aware of just yet

sorry for the mom talk..if this was me 2 years ago, I'd already have the Steed Speed mani on my car, installed with a single turbo of some sort trying to tune with ATP now, i'd like to wait a bit and have more fun with RBs now that proper tuning is finally coming to completion

[MDORPHN]

Originally Posted by dzenno

I wouldn't necessarily call it a downfall...every turbo application behaves differently and has its advantages and disadvantages...choose a smaller turbo and you get next to instant spool sacrificing some of the top end, choose a big turbo and you sacrifice instant spool but get a great top end...all depends on what you prefer to drive, what your budget is, and what your appetite for destruction and unforeseen issues is with something unproven yet in terms of reliability of the overall package (not talking about turbo itself or engine itself, just overall screwing around with the car on a lift constantly with things to find out why this why that)..eventually with time the confidence level and actual real costs (on top of the full kit cost) associated will come to light and it'll be a more true representation just what this engine can/will do with any particular aftermarket turbo option out there and what is worthwhile and what costs $$$ and constant headache...

Don't listen to vendor propaganda, don't listen to pumped up enthusiasts who aren't running these or spending their hard earned cash on these and put the dyno numbers to the side a bit...wait until the cars are out on the road and people are driving with these kits like they should be driven and hopefully many of them will be fair and open enough with the community as I've been in the past with my mods, and actually share their experiences with us

I know that I've absolutely taken the car to hell and back with RB turbos and they're proving to be very reliable along with the power levels provided and current boost levels..with some more tuning we'll be at 500-520whp (maybe more, not counting on it) and right now I'm personally not planning on guineapigging another aftermarket kit but will be following very closely

If no one has been in an RB high boost car do yourself a favor and ask a local member for a ride...then set your power goals as they do come with many potential financial sacrifices many aren't ready to make and/or aren't aware of just yet

sorry for the mom talk..if this was me 2 years ago, I'd already have the Steed Speed mani on my car, installed with a single turbo of some sort trying to tune with ATP now, i'd like to wait a bit and have more fun with RBs now that proper tuning is finally coming to completion

Have you done any extended road course work with the RB turbos and, if so, what was the rise in IATs?

Thanks.

Neil

[dzenno]

No I have not but I do plan on hitting the road coarse this summer with them as well as the dragstrip which opens April 7th

In terms of IAT, they'll do much better than stock turbos at all boost levels as they're further inside their efficiency range. Running them at the track at 15-16psi (445-450whp) on pump 94 octane without meth is a really great road coarse tune I'd think and provides for really nice throttle input/control due to their spool characteristics...at those boost levels meth isn't required but a tiny misting nozzle to keep IATs in check (50/50 or even 100% water even) would be nice to keep things nice and cool in the charge tract..

[MDORPHN]

Originally Posted by dzenno

No I have not but I do plan on hitting the road coarse this summer with them as well as the dragstrip which opens April 7th

In terms of IAT, they'll do much better than stock turbos at all boost levels as they're further inside their efficiency range. Running them at the track at 15-16psi (445-450whp) on pump 94 octane without meth is a really great road coarse tune I'd think and provides for really nice throttle input/control due to their spool characteristics...at those boost levels meth isn't required but a tiny misting nozzle to keep IATs in check (50/50 or even 100% water even) would be nice to keep things nice and cool in the charge tract..

Very helpful response. Thank you!

Neil

[jippii ensio]

Originally Posted by Brey335i

Yeah, but I still think one of the biggest downfalls is that we aren't able to build power to redline

If the peak power is at the redline, you are hitting the rev limiter all the time, if you want to use the peak power that resides there. The peak power should be before the redline to max the drivability in avoiding fuel cuts and enjoying quicker spool.