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11-14-2011, 12:20 AM | #1 |
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Any Z4 35is with JB4
Greeting,
Anyone have good result with JB4 on 35is? HP gain over stock car? HP gain over MOD car? MOD part ... Which Map and HP gain ? Which JB4 firmware installed? Thanks ~ BR Kenneth |
11-15-2011, 03:22 AM | #2 | |
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my Z4 is faster than an iS if I have a Jb+ in it Imagine how fast the IS will be with a Jb4
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11-15-2011, 06:55 AM | #3 | |
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jb4 is def more powerful, any traction issues? i'm not a fan of LC so with DCT traction is a factor. any number in terms of time? 1/4 mile?
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11-15-2011, 10:05 AM | #4 |
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I would love to see a dyno comparing the before and after the addition of a jb4, because as far as i know they both boost the same (roughly 15psi) so at least for the seven seconds that the car allows the 15 psi boost (probably similar to jb4 as well due to heat soak) it should be very close. Thats why i would love to see a dyno comparison because theoretically it should be very similar.
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11-15-2011, 11:10 AM | #5 | |
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11-15-2011, 11:36 AM | #6 | |
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Z4 has DCT, 335i does not. Z4 weighs less. stock for stock, a Z4 35i is faster than a 335i. what a JB+ does it generally increases the boost to about 10PSI, depending on that the setting is if you put it on 100%, you're at 13 i think. Traction is an issue with any LC. my M3 has traction issues as well. my z4 has LC traction issues stock lol no 1/4 mile times... but my old z4 35i with a jb4 alpha (first z4 with a jb4, and BMS was testing how to use it with the DCT), i did a 1-60 in 4.31 don't quote me, it's been a while... 287whp stock, 349whp after Jb4 alpha 288wtq stock, 351wtq good numbers
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11-15-2011, 01:11 PM | #7 | |
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Good numbers indeed, I,d like to run a stock z35 and see the difference I used passport timer and got 4.3 0 to 60, not sure how accurate that is I like jb+ for installation simplicity
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11-15-2011, 06:10 PM | #8 | |
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JB4 is where it's at though
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11-15-2011, 08:18 PM | #9 |
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yeah i know
i'll consider it in spring, i want to ride in a tuned car to feel the difference, a lot of mixed reviews with IS
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11-16-2011, 08:58 PM | #10 | |
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http://e89.zpost.com/forums/showthread.php?t=605539 |
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11-16-2011, 09:23 PM | #11 |
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Christmas present is coming from the mrs. Will let everyone know soon. Will be putting it on the dnyo and doing 1/4 track and BMW performance center tracks times to show the gains! Looking forward to it!
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11-17-2011, 08:49 AM | #13 |
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Must be nice living right next door to the Performance Center! Don't need a hotel to go to their driving schools.
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11-17-2011, 07:24 PM | #18 |
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Youre running map2 without DPs?
And doesnt cali only have 91, no 93?
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11-17-2011, 07:36 PM | #19 |
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11-17-2011, 07:39 PM | #20 |
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Nice!
I get 93 around here but was worried about no DPs. Ill have to kick it up to map 2
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11-17-2011, 07:50 PM | #21 |
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11-18-2011, 12:30 PM | #22 | |
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Thanks for all replies...
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Without downpipes...35is + JB4 can run smoothly at map 2 without any issue? Actually I still thinking weather stock piping can sustain 15psi or map 2 setting for long run or not ... BR |
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