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    Has anyone tested the XI power limits

    As most of you know I'm looking at buying a new 335 for either a single or the Stage 3s.

    The Xi obviously is on my mind, has anyone figured out if it can hold 550+whp without blowing up the transfer cases?




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    I know of at least one single turbo 335Xi - idspeedskater on the other forum.

    In general, the transfer case appears to be pretty stout. And it's going to be the torque that will likely kill it, so I'd say a single is a better option than the stage 3 (although launching an Xi with the VT3s would be something I'd pay to experience!).

    -Rich

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    This is something I've thought about too, an XI as long as it can handle the power would be an absolute beast with a large single/TT setup. I don't see you couldn't upgrade front and rear though
    2009 335i coupe back to stock...for now

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    Click here to enlarge Originally Posted by Legionofboom Click here to enlarge
    As most of you know I'm looking at buying a new 335 for either a single or the Stage 3s.

    The Xi obviously is on my mind, has anyone figured out if it can hold 550+whp without blowing up the transfer cases?
    I think it's about the torque not whp

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    You all know you're right, the torque is what breaks things, I was just using HP as a figurative statement.

    Interesting, I might be getting an XI if they can handle it, it would be fun to have an AWD 335




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    My point on the torque was the singles seem to build the torque wave a little easier so it could help the transfer case survive longer. There are stg2 upgraded twins pushing the same amount of torque you might see with a single, so I'd say you are in good shape. The torque I saw on the PTF VT3 dyno was insane - well over 600ftlbs, maybe even 700, I forget, but it was nuts.

    -Rich

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    1 out of 1 members liked this post. Yes Reputation No
    Will see what happens when I get my Vargas stage 3 kit. I have an xi and an at. Hoping to keep torque to 500 wtq until an at solution is available. Been patiently waiting for when the production kit ships out.
    Titanium Silver E92 09 BMW 335i xdrive 6AT
    KW V3 coilovers, AMS FMIC, AR Catless DP, Walbro 455 LPFP, BMS DCI, Alpina B3 Trans Flash, Vargas HPFP and Rail
    Protuned via Cobb by JR TUNED @ PandL Motorsports
    75%E85/25%93 blend 430awhp/470lbs tq on AWD Dynojet
    Dyno Video http://www.youtube.com/watch?v=iE6Ed...ature=youtu.be

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    Ok getting more serious about this XI idea, What EXACTLY is different between an AT 335i and the 335XI @DQE92




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    A 335XI with an built auto and big boost would be a drag strip beast!
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    FBO's. Spec S2+. E85.

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    Click here to enlarge Originally Posted by Legionofboom Click here to enlarge
    Ok getting more serious about this XI idea, What EXACTLY is different between an AT 335i and the 335XI @DQE92
    When I say "AT" I mean my car is an automatic transmission 335xi for clarity. I need to figure what turbos I want to get with the Vargas Stage 3s. I was thinking either the GTX2860 or the GTX2863. My goals with the turbos are 600awhp+ on 93 pump and 700awhp+ on E85. Does anyone know if the spool difference between the 2 turbos will be that much better?
    Titanium Silver E92 09 BMW 335i xdrive 6AT
    KW V3 coilovers, AMS FMIC, AR Catless DP, Walbro 455 LPFP, BMS DCI, Alpina B3 Trans Flash, Vargas HPFP and Rail
    Protuned via Cobb by JR TUNED @ PandL Motorsports
    75%E85/25%93 blend 430awhp/470lbs tq on AWD Dynojet
    Dyno Video http://www.youtube.com/watch?v=iE6Ed...ature=youtu.be

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    I would be very interested in seeing the maximum potential of 335xi AT. If someone can prove a realiable setup I'm all in.
    08 335XI AT - 11.762 @ 118.40 (WRECKED)
    09 335i xDrive AT - STOCK

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    Click here to enlarge Originally Posted by DQE92 Click here to enlarge
    When I say "AT" I mean my car is an automatic transmission 335xi for clarity. I need to figure what turbos I want to get with the Vargas Stage 3s. I was thinking either the GTX2860 or the GTX2863. My goals with the turbos are 600awhp+ on 93 pump and 700awhp+ on E85. Does anyone know if the spool difference between the 2 turbos will be that much better?
    Right I think we all knew that AT was automatic "steptronic". Im just trying to figure out the differences, I've never owned a AWD car, so I'm doing the crash course.

    How do LSDs work when you have two of them?

    (If i say something really stupid, which I feel like I just did, please just tell me)




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    LSD's on an AWD basically work per axle. So the "limited slip" per differential is per axle. The center diff controls front/rear bias.

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    Arn't people are destroying stock autos and XI diffs at stock frame power levels?
    E92 Bren Tune / E90 PTF Tune / E70 Twin Turbo Diesel JBD

    Got Boost?

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    ^^^Where have you seen this?
    2007 Jet Black E90 335xi "The Mistress" / PTF-Cobb / E50 / FuelitS2 / 5" Stepped FMIC / Synapse BOV and Charge Pipe / Alpina Flash / Muffler Delete w/ 4in Black Tips / DCI / 19x8.5 Satin Black Squared Enkei Raijins / 245/35/r19 Bridgestone Potenza S04 Pole Position / 20mm Rear Spacers / 2 10" Rockford Fosgate's Added to Logic7 (15 total speakers!)
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    I've read of numerous TC failures on the other forum. I suggest you search over there some before diving into an XI for drag racing. They were searching for TC upgrades like 2 years ago so..... I doubt they've found anything to work or else we'd be seeing XI timeslips and 1.5 60' times LOL
    2011 335is DCT, moving to Italy, looking for new car friends Click here to enlarge

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    Well havent had any issues so far with the stock tranny and no upgraded LSDs. Probably made about 100+launches last year at the 1/4 mile dragstrip with no tranny hickups or issues with the TC. Again Im willing to go down this path and have been waiting patiently for the Vargas Stage 3 Production kit to release.
    Titanium Silver E92 09 BMW 335i xdrive 6AT
    KW V3 coilovers, AMS FMIC, AR Catless DP, Walbro 455 LPFP, BMS DCI, Alpina B3 Trans Flash, Vargas HPFP and Rail
    Protuned via Cobb by JR TUNED @ PandL Motorsports
    75%E85/25%93 blend 430awhp/470lbs tq on AWD Dynojet
    Dyno Video http://www.youtube.com/watch?v=iE6Ed...ature=youtu.be

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    1 out of 1 members liked this post. Yes Reputation No
    what's your best 60' and ET? @DQE92? how many of those launches were at your 430HP/470TQ? An AWD 335i should be pretty beastly at the track. AT AWD guys need to realize though that it's very hard to spool a big turbo on the line with an AT on a stock TQ converter. If you can get a higher stall in the tranny this will greatly help your launch but if you're trying to spool a 6466 at the line in an AT with AWD it's going to be a super slow launch unless you're using nitrous to help build boost off the line.
    2011 335is DCT, moving to Italy, looking for new car friends Click here to enlarge

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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    what's your best 60' and ET? @DQE92? how many of those launches were at your 430HP/470TQ? An AWD 335i should be pretty beastly at the track. AT AWD guys need to realize though that it's very hard to spool a big turbo on the line with an AT on a stock TQ converter. If you can get a higher stall in the tranny this will greatly help your launch but if you're trying to spool a 6466 at the line in an AT with AWD it's going to be a super slow launch unless you're using nitrous to help build boost off the line.
    Best 60' 1.7 and most are 1.8-1.85 range. Best ET is 11.9 @115 actually on straight pump E85 no weight reduction and no meth. I have the 455 LPFP and the vargas rail and pump upgrade. I understand that I probably may not get the same type of launch with bigger turbos as with the stock turbos but thats why I went with Stage 3 twins instead of a big single.
    Titanium Silver E92 09 BMW 335i xdrive 6AT
    KW V3 coilovers, AMS FMIC, AR Catless DP, Walbro 455 LPFP, BMS DCI, Alpina B3 Trans Flash, Vargas HPFP and Rail
    Protuned via Cobb by JR TUNED @ PandL Motorsports
    75%E85/25%93 blend 430awhp/470lbs tq on AWD Dynojet
    Dyno Video http://www.youtube.com/watch?v=iE6Ed...ature=youtu.be

    Click here to enlarge

  20. #20
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    Click here to enlarge Originally Posted by SCGT Click here to enlarge
    LSD's on an AWD basically work per axle. So the "limited slip" per differential is per axle. The center diff controls front/rear bias.

    Thank you, that makes sense, do you know the differences between the rear and front LSDs?


    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    what's your best 60' and ET? @DQE92? how many of those launches were at your 430HP/470TQ? An AWD 335i should be pretty beastly at the track. AT AWD guys need to realize though that it's very hard to spool a big turbo on the line with an AT on a stock TQ converter. If you can get a higher stall in the tranny this will greatly help your launch but if you're trying to spool a 6466 at the line in an AT with AWD it's going to be a super slow launch unless you're using nitrous to help build boost off the line.
    This is good information, thank you guys. What you said makes me assume brake boosting the $#@! out of it will not spool a single? even using a line lock type setup for extra brake power?

    Nitrous isn't out of the question, but obviously the community is still working on a alternative fueling system, that will need to be addressed first.

    Click here to enlarge Originally Posted by DQE92 Click here to enlarge
    Best 60' 1.7 and most are 1.8-1.85 range. Best ET is 11.9 @115 actually on straight pump E85 no weight reduction and no meth. I have the 455 LPFP and the vargas rail and pump upgrade. I understand that I probably may not get the same type of launch with bigger turbos as with the stock turbos but thats why I went with Stage 3 twins instead of a big single.
    1.7 60' isn't quite as impressive as I thought an AWD car could put down at 400+hp, what wheel/tire setup are you running? (I guess 1.7 is actually pretty good for AT)


    Guys I know I'm asking questions that have been answered other places, I appreciate the direct to the point answers, I'm learning the xi differences through you guys, as well as reading as much as possible. THANK YOU
    Last edited by Legionofboom; 04-29-2014 at 05:45 PM.




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    @Legionofboom When I breakboost I leave about 3-5lbs @ 2500-3000RPM. My wheel and tire setup as follows: Apex Arc 8 17" x 9.5" squared wheel setup with staggered tires, Nitto NT555 275's in the rear and 245's in the front. If you check drag times I think I only saw 1 xi that ran a 1.6 60 ft. Probably done in 30-40 degree weather. DA usually sucks at the track I run at.
    Titanium Silver E92 09 BMW 335i xdrive 6AT
    KW V3 coilovers, AMS FMIC, AR Catless DP, Walbro 455 LPFP, BMS DCI, Alpina B3 Trans Flash, Vargas HPFP and Rail
    Protuned via Cobb by JR TUNED @ PandL Motorsports
    75%E85/25%93 blend 430awhp/470lbs tq on AWD Dynojet
    Dyno Video http://www.youtube.com/watch?v=iE6Ed...ature=youtu.be

    Click here to enlarge

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    adding these for future reference

    Click here to enlargeClick here to enlargeClick here to enlarge




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    Click here to enlarge Originally Posted by DQE92 Click here to enlarge
    @Legionofboom When I breakboost I leave about 3-5lbs @ 2500-3000RPM. My wheel and tire setup as follows: Apex Arc 8 17" x 9.5" squared wheel setup with staggered tires, Nitto NT555 275's in the rear and 245's in the front. If you check drag times I think I only saw 1 xi that ran a 1.6 60 ft. Probably done in 30-40 degree weather. DA usually sucks at the track I run at.
    Do you have to run a complete squared setup on AWD cars? (again sorry for stupid question) 9.5 inch wheels in the front I would think would be really wide.

    I will be getting a set of apex's wheels and be running either the NT555s or R888s




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    2 out of 2 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    I've read of numerous TC failures on the other forum. I suggest you search over there some before diving into an XI for drag racing. They were searching for TC upgrades like 2 years ago so..... I doubt they've found anything to work or else we'd be seeing XI timeslips and 1.5 60' times LOL
    Nah, I've seen hardly any transfer case failures on any forums in regard to the xi. I'm an xi and am fbo, meth and e85 with about 200 drag strip runs with a best of 11.89 at 118mph with no weight reduction. As for 60 times, I see plenty of mid 1.6x but mostly see 1.7x and rarely anything higher. The xi is very easy to launch but I am also an auto. Even after all those hard launches I have never had any drivetrain issues in regard to being an xi. Also, you can get away with lighter and narrower tires due to 4 wheel grip.

    You're right, a couple years ago we started a thread for a group of us to fund a shop to research the transfer case but after tearing it down the shop was surprised how stout the tc was put together and said there should be no issues till very high tq levels.

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    Depends on if you want form of function. If you are looking for straight performance, a square setup is the way to go but obviously for looks a staggered setup looks better.

    Click here to enlarge Originally Posted by Legionofboom Click here to enlarge
    Do you have to run a complete squared setup on AWD cars? (again sorry for stupid question) 9.5 inch wheels in the front I would think would be really wide.

    I will be getting a set of apex's wheels and be running either the NT555s or R888s

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