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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > COBB + RB Turbo Fun: 105 - 200 km/hr - ~8secs?? :)



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      06-16-2011, 08:52 AM   #45
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Quote:
Originally Posted by Autobahn335i View Post
From the RB reviews I've read it seems indeed that the performance of those turbos at pump gas levels is comparable to stock turbos + meth and high boost.

Perfect in my book as I don't want to run meth in my car
Pretty much..
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      06-16-2011, 08:54 AM   #46
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Originally Posted by enrita View Post
plus the pull after 6000 rpm and after 200 kmh which is completely different than stock turbos.
exactly...on top of that with a flash you can rev it out to 7200rpm, not sure how healthy that is though..but it does give you about 1000rpms more to work with when actually shifting at 7k rpm and not hitting a rev limiter and having a fuel cut by the ECU...on stock turbos I used to shift at 6000-6100rpm for my best traps..
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      06-16-2011, 01:28 PM   #47
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Originally Posted by dzenno View Post
You have to realize you're talking peak boost as well...your boost curves don't look anything like what Cobb stage 1 is running..in your case you're holding 15psi to redline (from n54tech logs I looked at)...in case of Cobb they are at 14psi at 4500rpm, 13.5psi at 5500rpm, 13psi at 6000rpm, 12.5psi at 6500rpm, 12psi at 7k rpm...if it held 15psi flat to redline, well who knows but you get the point...another thing is I really didn't try to pull off any record runs, I was driving through Mexico had my iPhone in my hand no traffic and thought hey why don't I record a pull started a pull at 105km/hr from "cruising" and lost a bunch of time building boost and timing and ramping acceleration up from there...had I really tried to pull off the best time I could it would've been way better to accelerate in 3rd gear from about 3500rpm so full boost and timing is there and already accelerating while hitting 105km/hr...you know what I'm talking about maybe try setting up your car with a boost curve like the cobb stage 1 and run the car and post a video Add about 4deg of CPS offset on top of that as well as Cobb targets 10deg at redline, oh and if you really want to compare dial your AFRs so they're mid to low 12s through midrange and high 11s 6k rpm to redline

No worries, I'll try to have a few more videos over the coming days when I make it down to Mexico..
Don't get me wrong, being in the 9 second range without meth/race fuel is phenomenal. Meth gives me about a 4-5mph boost in trap speeds! So either way you go...performance is impressive. I don't mind meth, because I love the lower IATs going in the engine...but for most people the RBs might be more practical..if not harder to install though. Can't wait to see your 60-130 times soon.
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2011 Alpine 335d M-Sport 12.34 @ 110.48mph
2012 LEAF 130MPGe
2008 Black 335i Sedan. 11.11@ 129.47 mph,(8.39 sec 60-130 stock turboWR)
2008 Monaco Blue JB3 2.0 335i Coupe. 11.33 @ 132.77 mph (N54 trap speed WR)
60-130mph: 6.95 seconds stock turbo WR (.16% slope)
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      06-16-2011, 02:05 PM   #48
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All in, how much are RB turbo's with install?
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      06-16-2011, 02:11 PM   #49
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Originally Posted by hotrod182 View Post
Don't get me wrong, being in the 9 second range without meth/race fuel is phenomenal. Meth gives me about a 4-5mph boost in trap speeds! So either way you go...performance is impressive. I don't mind meth, because I love the lower IATs going in the engine...but for most people the RBs might be more practical..if not harder to install though. Can't wait to see your 60-130 times soon.
I love meth as well, I run it all the time but ever since I started getting misfires up top I turned it off as I'm on low boost now to be able to pull all the way to redline..did a couple pulls at 18.5psi last night, perfect to about 6300-6400 then misfire...and this is with Cobb stage 1 with a JB+ minimum setting on top...i know for sure now its not tune related as I've tried ALL of them

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All in, how much are RB turbo's with install?
http://www.e90post.com/forums/showthread.php?t=480025
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      06-16-2011, 02:42 PM   #50
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ty sir
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