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Take 7: We finally dyno a Steptronic all proper-like
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12-08-2006, 06:52 PM | #1 |
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Take 7: We finally dyno a Steptronic all proper-like
Hi guys,
In the last two days, we've installed XEDEs on two Steptronic'd 335is. Today, we managed to a proper single gear (3rd) pull from low RPM to Redline without it downshifting. As someone suggested in another thread, the trick is to disable DTC (hold down for 5 seconds) before you even roll (even a tiny bit) on the dyno rollers. If you roll first and then disable DTC, all is lost. Of course, you will also have to stay out of the kickdown switch at the end of the throttle travel. So thanks to all who contributed to the project Back to business... All dyno testing was done in 3rd gear. By 3000rpm, the car is full throttle (just shy of the kickdown switch). The dyno run last several seconds less then a normal 4th gear 6MT dyno run. So it's best not to directly compare them since testing conditions/procedure is so different. This customer's car (name withheld) put down 260-261whp in stock form (run 2 and 3). With the Xede activated (running the baseline Stg 0 map), the very next run it put down 315whp. That's a healthy 55whp gain with no custom tuning. Torque went from 273 to 327lbft-- a gain of 54lbft. The car generated so much torque that it began to rock back and forth on the dyno (hence the little oscillations in the midrange). Steptronic'd Stg 0 vs. Stock 91oct In a 4th gear run (not shown), torque when up to 350lbft but power dropped to 310whp (longer run generated more heat up top). Again, this dyno does seem to read quite a bit lower than the other Dynojets I've used. For instance, we've baselining stock 6MT cars at 270whp. The dyno I used last weekend in TX was reading 285whp for stock 6MT cars. Yes, there is an octane difference but I'm not so sure it matters at stock power levels. Which dyno is right? I don't know. And it really doesn't matter, I suppose. What is important is that we compare runs only done on the same day on the same dyno. So there you have it Now all we need to do is dyno test a 6MT Stg 0 car (next week). All of the 6MT cars we've tested so far have exhaust systems. Cheers, shiv |
12-08-2006, 07:03 PM | #2 | |
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Anyway, just wanted to throw in that support on dyno variance, even with same model Dynojet, is both real and can be significant. |
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12-08-2006, 07:25 PM | #3 |
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Shiv,
It will be interesting to see how our S. FL 335i's dyno at before (stock) and after (w/ Xede) at JapTrix next week, since they supposedly have the Mustang Dyno (which I believe typically shows lower numbers than the DynoJet dyno); however, we are all running on 93 octane though. It's great that you now know how to do the 3rd gear dyno for a Auto/Step 335i without the car downshifting automatically.
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12-08-2006, 07:27 PM | #4 | |
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Isn't this thread from TX about a 6MT Stg 0 tune that put down silly HP numbers WITHOUT an exhaust? http://www.e90post.com/forums/showthread.php?t=38686 |
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12-08-2006, 07:31 PM | #5 | |
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Yes, there have been several. But as you said, they were all done out-of-state on 93oct. I haven't done any local 91oct 6MT Steptronics yet. I'm not concerned about the map. I just want to compare the 6MT to the Step on the same dyno, same day. I had a 6MT also slotted for today but he had to reschedule. -shiv |
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12-08-2006, 07:32 PM | #6 |
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Ah gotcha... didn't realize we were talking about a 6MT on 91 (in cali). I am out of state, and I do have 93... so that's all I care about
Thanks for the clarification, Geoff |
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12-08-2006, 08:06 PM | #7 | |
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Here's a review from the owner (Mr. Z) He is a member of this forum but wants to remain anonymous due to warranty concerns....
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12-08-2006, 11:12 PM | #9 | |
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Is there a reason for the 3rd gear run instead of using the 4th gear run like the others? |
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12-09-2006, 09:27 AM | #11 |
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Shiv,
Steptronic question for ya. Now that you had a chance to drive the Steptronic in Texas running 93 octane and the Steptronic here running 91 octane, do you notice a difference from your seat of the pants dyno when you drove it? I know the dyno numbers are going to show more hp and tq for the 93 but can you really feel it? I'm in Cali and it's going to be a small burden to stock up on 100 octane and mix with 91 every time I gas up. IS IT WORTH IT???? Thanks |
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12-09-2006, 10:33 AM | #12 |
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"I know everyone that has had the Xede installed has said the same thing, that the car feels completely different. And I cannot emphasize how true this is. Coming from a ‘02 e46 M3 the stock 335i felt a tad slower and less responsive. With the xede the difference is now phenomenal with the 335 really shinning where the M3 lacks, torque. The difference in the throttle response is noticeable and now feels on par with my old M3. The power increase is insane; it’s hard to believe that there were zero mechanical changes to the car, no exhaust, no cam, no headers, etc. The car now feels complete."
This is what was always lacking with the 335. The throttle is really slow compared to my old M3 and I always feel there's something missing. Thankfully the XEDE will solve this problem. |
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12-09-2006, 05:28 PM | #13 | |
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Although if you want to get technical, HP is really just TQ at a specific engine RPM... HP = TQ * RPM / 5252 |
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12-09-2006, 07:04 PM | #14 | |
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12-10-2006, 12:36 AM | #15 |
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Question for Mr Z
Mr Z, now that you have all this new power and torque what happens if you stomp on the gas in Sport mode in 1st gear with stability control disabled? Do the wheels light up or does it just take off like a bat out of hell? That has always been one problem with automatics, it is hard to get any wheel spin on pavement but I am guessing with 315 HP to the wheels it should pretty easy to spin them
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12-10-2006, 02:17 PM | #16 | |
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12-11-2006, 10:28 AM | #17 | |
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12-11-2006, 02:13 PM | #18 | |
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12-11-2006, 02:35 PM | #19 | |
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True, torque at high rpm combined with short gearing (torque multiplication). Low end torque is nice for stop and go in daily driving, and the 335 shines. |
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12-11-2006, 11:07 PM | #20 |
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The gain is consistent 55-60whp/55-60 lb-ft torque with Xede. That all matters.
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01-27-2007, 03:20 PM | #21 |
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Can't wait!
Shiv,
Your guys finally responded (I'm the slightly angry email from kc, mo ). Calvin talked to me and made all my worries disappear! I should be placing the order by Wednesday and am going to be installing it with my friends at Rosso Motorspots in Overland Park, KS. Can't wait to get them involved as they are really big on ECU map's, and hopefully we will have some of our own to upload for your customer use in the near future. Thanks again, and i can't wait!
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