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      11-28-2009, 10:08 AM   #23
Alext
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Try putting stock intake back. The Injen could be sucking in all that hot air which for an NA will affect more than the 135i

My 135i feels better in the cold of course, but doesnt seem to phased by the heat to be honest.
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      11-28-2009, 02:42 PM   #24
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Smile

Quote:
Originally Posted by chylld View Post
I did 4 runs tonight and I think I may have figured it out, could have been something trivial and stupid. Let this be a preview:

Attachment 329808
that's more like it
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      11-28-2009, 05:36 PM   #25
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29/11 UPDATE

So I did some more runs last night and much to my delight, I got some much better results:

7.89 +/- 0.25 (compared to a previous average of 9.23 +/- 0.47)

After studying the graphs very carefully, I've concluded that the improvement is due to a combination of the following 2 factors:

1) Calibration of the dynolicious app. Yesterday morning I had calibrated the app before I set out, but it turns out the accelerometer in the iPhone is very sensitive to temperature changes, so in reality we probably needed to re-calibrate it every 10 minutes.

2) Heat of the air. Our morning runs were recorded in near 40 degree heat, while last night's runs were at 30C.

Now if we make the following assumptions:

1) The app was not calibrated properly
2) The heat of the air did not have a significant effect on engine performance
3) Our method of using the stopwatch was inaccurate

then I am pleased to present the corrected times:

Auto:
stock, 1 person on board: 8.50 +/- 0.16
pbx, 1 person on board: 8.00 +/- 0.34
pbx, 2 people on board: 8.56 +/- 0.09
best run, 1 person on board: 7.53

Manual:
stock, 2 people on board: 7.50 +/- 0.40
pbx, 2 people on board: 7.33 +/- 0.30
best run, 2 people on board: 6.75

I estimate the 0-100 for the manual with only 1 person on board to be ~6.3s.
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      11-28-2009, 05:45 PM   #26
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Quote:
Originally Posted by d3syd View Post
Another thought.... bad batch of fuel?
We both exclusively use 98 RON petrol, and janus even sticks to the same brand. It's possible there was some bad fuel, but I'd guess that the effect would be statistically insignificant...

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I know taka has a 35i, but he found that the best launches was with DSC off and DTC on. May be give that a try? I also found that even though the light is not flashing, the engine do bogged down a when both are on.

How were you shifting your Auto? Manually or auto switch? Did you remember it launches in 2nd and you'll have to physically move it to M1?
The next chance I get I'll try it with DSC off and DTC on. I always drive my auto in full manual, and yes I remembered to shift down to first gear and turn the aircon off etc

I also tried upshifting at 6k rpm (based on the fact that power drops off quite rapidly approaching the 7k rpm redline) but the curves show it's better to let it upshift itself at redline.

Quote:
Originally Posted by Alext View Post
Try putting stock intake back. The Injen could be sucking in all that hot air which for an NA will affect more than the 135i
The problem with this is that the engine will take a long time to re-adjust itself to the stock intake. Given how much of an effect the environmental factors have on both the cars and the measuring equipment, it makes it difficult to compare times before/after intake.
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      11-28-2009, 07:02 PM   #27
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Quote:
Originally Posted by chylld View Post

The next chance I get I'll try it with DSC off and DTC on. I always drive my auto in full manual, and yes I remembered to shift down to first gear and turn the aircon off etc
I wasn't aware you could have DSC off and DTC on? As far as i was aware, i thought you could only have DTC off or both DSC and DTC off (long button press).

Can someone explain? Being quite a noob here....
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      11-28-2009, 07:17 PM   #28
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Quote:
Originally Posted by Taymaishu View Post
I wasn't aware you could have DSC off and DTC on? As far as i was aware, i thought you could only have DTC off or both DSC and DTC off (long button press).

Can someone explain? Being quite a noob here....
turning off DSC (one press) activates DTC. the long press will deactivate both.

hope it makes sense.
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      11-28-2009, 07:18 PM   #29
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Quote:
Originally Posted by Taymaishu View Post
I wasn't aware you could have DSC off and DTC on? As far as i was aware, i thought you could only have DTC off or both DSC and DTC off (long button press).

Can someone explain? Being quite a noob here....
If we go by mileage/time you are far from a n00b

The default setting is DSC on, DTC off. Press it momentarily to deactivate DSC and activate DTC (which is a less strict version of DSC), and press and hold to deactivate both DSC and DTC.
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      11-28-2009, 07:30 PM   #30
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Quote:
Originally Posted by chylld View Post
The problem with this is that the engine will take a long time to re-adjust itself to the stock intake. Given how much of an effect the environmental factors have on both the cars and the measuring equipment, it makes it difficult to compare times before/after intake.

You may be suprised. A lot of owners report immediately improvements going from BMS duals to stock on the 135i. In any case the effect of the decresed intake temps will be felt immediately and as I said previously, on a NA car it will be more noticeable than FI (with intercooler).
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      11-28-2009, 07:40 PM   #31
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Quote:
Originally Posted by Alext View Post
You may be suprised. A lot of owners report immediately improvements going from BMS duals to stock on the 135i. In any case the effect of the decresed intake temps will be felt immediately and as I said previously, on a NA car it will be more noticeable than FI (with intercooler).
Janus' impression was different; after fitting the Injen intake he said it took the car a while to adjust (or was it wmj in brissy who also has the Injen?)

I'd definitely like to do a comparison, but if there is any lag in the engine getting used to the stock intake again, thus taking a while to get back up to stock output, then it will obviously show an unfair performance increase for the intake.

I hope it actually does make a difference though, as it would explain why he gets so much closer to the manufacturer reported time than I did.
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      11-28-2009, 07:43 PM   #32
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Quote:
Originally Posted by 'fatboy' View Post
turning off DSC (one press) activates DTC. the long press will deactivate both.

hope it makes sense.
Righto! I thought default was DTC and DSC on.

Ie: One press would deactive DTC, the long press deactivated DTC and DSC.

No worries then
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      11-28-2009, 07:49 PM   #33
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alex when r we going to the royal national park?
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      11-28-2009, 07:55 PM   #34
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You would be surprised how much heat soak affects NA cars. Two of my Ford V8s have suffered dreadfully when they got heat soak. The ED Sprint went from mid 15 1/4 miles to hogh 16s with no change but heat soak ( after 11 straight runs .. there was no one else there ! ) and the boss 5.4 had a noticable drop in power when it was hot. Yet to be able to wind out the G6ET in the heat.
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      11-28-2009, 08:00 PM   #35
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alex when r we going to the royal national park?
I need to take you to Akuna Bay, first
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      11-28-2009, 08:03 PM   #36
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man the roads there are so bad....alright im in! hahaha
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      11-28-2009, 09:03 PM   #37
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ok, good to hear some more promising results Chylld, and that a couple of factors have effected our times. Still not all that happy with where we're at.. lets hope for a cool day sometime soon, would be good to do some more runs in 20 degrees instead.
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      11-29-2009, 08:35 PM   #38
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Nice work guys! I might have to try this dynolicious app too to see what times the 130 pulls.

If you're still hungry for a lower time, may I suggest finding two spare wheels to put semi slick tyres on?
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I need to take you to Akuna Bay, first
*puts hand up* I'm in too.
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      11-29-2009, 09:04 PM   #39
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Nice work guys! I might have to try this dynolicious app too to see what times the 130 pulls.

If you're still hungry for a lower time, may I suggest finding two spare wheels to put semi slick tyres on?

*puts hand up* I'm in too.
Alright, we'll get something going for this weekend. Perhaps Friday night?
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      11-29-2009, 09:21 PM   #40
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Yup, done!
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      11-29-2009, 09:56 PM   #41
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There are objective data you can get from an intake, if you think it is taking hot air in.

Most car measure intake temperature and you can get this data from a OBD scanner.

e.g. OBDkey and its software.
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      11-29-2009, 10:27 PM   #42
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I was going to say recalibrate your iphone but you've already done that. The other factor is heat which slows down your car especially with an injen intake. Also, you need to practice rev launching with DTC/DSC off. You will only get your best time with all the nannies off.
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      11-29-2009, 11:27 PM   #43
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Hey Chylld, i reckon we pour half a litre of nitrous into our tanks then give it another go.. what you think?
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      11-29-2009, 11:28 PM   #44
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might be an interesting exercise to put the regular intake back on and see how it goes. Trouble is I'm a very very lazy man..
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