[hotrod182]

Did some testing last night with the JB3 w/map switching. Besides 19” M6 Reps w/Generals, the 08 coupe is stock otherwise.
On map #6 my results were as follows. ( my first run was slower, probably due to adaptation).

13.1 @ 111.9mph 2.1sec 60ft
12.8 @ 112.3mph 2.0 sec 60ft
12.7 @ 112.6mph 2.1 sec 60ft
12.9 @ 112.2mph 2.2 sec 60ft

I then switched to the default map#3

12.9 @ 111.1mph 2.0 sec 60ft
12.7 @ 112.3mph 2.0 sec 60ft.

So I saw the immediate drop in speed when switching to map #3, but then on the 2nd run the speed went back up. So I am thinking maybe with adaptation to the timing retard, etc, the 2nd run came back up to speed. It kind of makes sense though, because I believe absolute boost pressure is about the same between the 2 maps other than a more aggressive curve down low and less IAT decay with the map 6. The map 6 feels significantly more powerful driving around town.

I will do some more testing to back up my findings. Just grooming the coupe for some further qtr mile runs, LOL. The coupe seems really different in the way the throttle and shifting responds. The shifts seem kind of subdued with a little lag between them. When it shifts, it almost seems like there is a lag before the car starts pulling again. The sedan would just yank between the shifts. Don’t know if this is the difference between the 07 and 08, or maybe it just needs to be broken in a little more with ¼ mile runs, who knows. But the times/mph seem to be in the ball park any ways. With the Nittos I would say I would be in the 12.5-12.6 range. I believe in the sedan I was right around 12.4. I will have to test with them also. The temps were really cold tonight though (44F), so that probably helped the traps a bit.

As luck would have it, came up on a sporty looking car. At first I thought it was a S2000. He was speeding by, so I chased him down. It was a new Z4 test car. We had a friendly run from a stop light with nothing but open road in front of us. He got the jump on me. At upper speeds I slowly started to pull on him and finally past him. The car was fairly quick though! I mean, it seemed like it was almost as quick as the brand new Carrera 4S I ran a few times. The Z4 had a really coarse sounding exhaust. It really didn’t sound like a 335I at all, that’s for sure.


Edit:12/20/08:

Made over a dozen runs last night to finish my evaluation of the different JB3 maps on the 2008 335I Coupe.

Test Specifics: 17” Nitto Drag Radials Rear. NT555Rs, 19” Generals Front.
Shell 91 Octane. 46F
Map #6

¼ mile Vbox test results: With the Nittos, you can clearly see the advantage of not having to back off the throttle before/after the 60' marker.

12.8 at 113.1 mph 2.0 sec 60ft
12.5 at 113.6 mph 2.0 sec 60ft
12.5 at 113.4 mph 2.0 sec 60ft
12.5 at 113.7 mph 2.0 sec 60ft

Test Conditions:
Same wheels/tires
Added 2.5 gallons of 100 octane Shell pump gas to 1.5 gallons of Shell 91 Octane. Approx 97 octane? Approx 41F
Switched to MAP #7 (race map)

12.4 at 115.4 mph 2.0 sec 60 ft
12.4 at 115.4 mph 2.0 sec 60 ft
12.3 at 115.6 mph 1.9 sec 60 ft
12.3 at 115.7 mph 1.9 sec 60 ft
12.2 at 115.9 mph 1.9 sec 60 ft
12.3 at 115.9 mph 1.9 sec 60 ft
12.2 at 115.9 mph 1.9 sec 60 ft

After allowing engine to cool down from 250F oil temp to 230F:

12.2 at 116.6 mph 1.9 sec 60 ft
12.4 at 116.3 mph 2.0 sec 60 ft (wheel spin)
12.2 at 116.3 mph 1.9 sec 60 ft

[5soko]

HOLY shit Z4 test CAR!

As always, great results and thanks for taking the time man!!

[i2iSTUDIOS]

sucks that you guys have to run with 91 octane, looks like with a bit more octance the tunes really uses up the extra carbon chains.

[335i/335d?]

do they turn up the boost on test cars??

maybe the Z4 has the DCT??

[brianhn1]

I wonder what the driver of the Z4 was thinking when you slowly edged passed him. "Crap, I just got beat by a 335i...sigh...more testing to make this faster."

[Sniz]

at least he didnt trounce the Z4 test car w/ his Sedan on race gas......he may have delayed the release for some time as the engineers tried to figure out what just happened.

[5soko]

New Z4 does 0-100km in low 5's. (5.2/5.1) and that is according to bmw.

[Sniz]

Originally Posted by 5soko335i

New Z4 does 0-100km in low 5's. (5.2/5.1) and that is according to bmw.

do they have different engines?

[5soko]

Yea, sDrive23i, sDrive30i, and sDrive35i(N54).

Being as bmw is sometimes conservative with there numbers i would guess it just about as fast as a stock 335i if not faster? Not exactly sure on the weight.

[mmmotornutz]

Interesting results. Looks like Map 3/4 is best for 91 octane. Map 5/6 w/ 93 and up will probably be a bit faster.

I have a 6MT and I noticed lately that there is a bit of a lag in between shifts. I have a sedan though w/ 9k miles.

[bubbletea 4 me]

i thought map 6 is recommanded to be ran with 93+ oct and some additional mods (intake/dp??). so if you run higher oct gas + additional mods, maybe map 6 will perform better compare to if only map3?

[hotrod182]

Well map 6 has much more torque down low. But in 1/4 mile work, the top rpm power is really what counts most. Bottom end torque can only do so much with the limited traction. I will try and do more testing this weekend with the DRs.

The Z4 is at least a couple hundred lbs lighter. However, the exhaust sounded coarse and free flowing. Who knows how it was configured. It was decent. I have a video, but only caught the end where I was walking by him. He must have been thinking WTF just happened??

[Boost Gomez]

That's so sick that you came up on the new Z4 and pulled on it. That must've been a surprise to the tester.

[Sniz]

question on Vbox testing...can you make it display your e.t. like this

12.7x instead of just 12.7?

[hotrod182]

Originally Posted by Sniz

question on Vbox testing...can you make it display your e.t. like this

12.7x instead of just 12.7?

Nope, it samples 10/sec. But its pretty good at it. And usually compared to the track, it is conservative anyways.

Hopefully tonight, I will do the same testing of map #6 on DRs,
and the Map 7 on 100 octane, so you can see the progression of trap speed/ET improvement.

Any guess on what numbers I might get in the 08 coupe?

[Bobby_Light]

I saw that same Z4 test car in Decker Canyon last weekend.

[hotrod182]

Originally Posted by Bobby_Light

I saw that same Z4 test car in Decker Canyon last weekend.

Was he driving like a maniac?
Pull out a camera, and they shy away though..like a cross to a vampire!

[Tito335i]

that Z4 is sick, love the new models !!! Nice runs by the way, could do better though

[Bobby_Light]

Originally Posted by hotrod182

Was he driving like a maniac?
Pull out a camera, and they shy away though..like a cross to a vampire!

Didn't look like he was driving crazy, but I passed him (going opposite directions) in the canyons so I saw him for only a short time. He was hard to miss for sure with the black/white color scheme. You're right about a camera though; they get very sensitive from my experience.

[hotrod182]

Originally Posted by Tito335i

that Z4 is sick, love the new models !!! Nice runs by the way, could do better though

Made over a dozen runs last night to finish my evaluation of the different JB3 maps on the 2008 335I Coupe.

Test Specifics: 17” Nitto Drag Radials Rear. NT555Rs, 19” Generals Front.
Shell 91 Octane. 46F
Map #6

¼ mile Vbox test results:

12.8 at 113.1 mph 2.0 sec 60ft
12.5 at 113.6 mph 2.0 sec 60ft
12.5 at 113.4 mph 2.0 sec 60ft
12.5 at 113.7 mph 2.0 sec 60ft

Test Conditions:
Same wheels/tires
Added 2.5 gallons of 100 octane Shell pump gas to 1.5 gallons of Shell 91 Octane. Approx 97 octane? Approx 41F
Switched to MAP #7 (race map)

12.4 at 115.4 mph 2.0 sec 60 ft
12.4 at 115.4 mph 2.0 sec 60 ft
12.3 at 115.6 mph 1.9 sec 60 ft
12.3 at 115.7 mph 1.9 sec 60 ft
12.2 at 115.9 mph 1.9 sec 60 ft
12.3 at 115.9 mph 1.9 sec 60 ft
12.2 at 115.9 mph 1.9 sec 60 ft

After allowing engine to cool down from 250F oil temp to 230F:

12.2 at 116.6 mph 1.9 sec 60 ft
12.4 at 116.3 mph 2.0 sec 60 ft (wheel spin)
12.2 at 116.3 mph 1.9 sec 60 ft

Pretty interesting results. You can see how important the 60’ times are to your quarter mile ETs. One tenth off your 60’s can take off about two tenths off your qtr mile. This is why it was so frustrating to have a 1.875 60’ time when the sedan ran in the 11’s. Seriously, with a 1.72 60’ time, we would have seen the sedan at a record holding 11.7x ¼ mile, and probably 118mph.

Which brings up another point. You can clearly see that the better 60’ times yield a better trap. In this car, it is clearly an advantage to put down the HP strongly in the beginning rather than having to feather the throttle part way past the 60’ mark. You can see the runs where the same 2.0 sec 60’ time yielded a relatively terrible 1/4 mile time. That is because the tires started spinning beyond the 60’ mark. I don’t know how some of you get 1.8 sec 60ft time on street tires. I would be happy to get that on DRs!


I was very curious as to what the results would be switching through the maps, for the most part I am very satisfied with them. Although I was skeptical at first, the throttle based map switching has proven to be easy and effective to use. I believe the coupe has good potential too! I will say it again and again, you can see by the amazing consistency of the Vbox, how invaluable it is in evaluating even the smallest of HP improvements. I personally find this much more useful than any dyno graph. This is simply more real world conditions in my opinion. Shows the true work of total power under the curve throughout the ¼ mile. Again, besides JB3, and tires/wheels, this car is totally factory stock. This is not a special race map, but I believe the same maps that everyone else will also get. I hope you find this extensive ¼ mile testing useful. It was hard work!

Also, if you have a grudge map against a buddy, make sure you are using high octane with the race map. Didn’t want to really make any more ¼ mile runs on the race map on 91 octane, but it seemed to work fine in semi aggressive 8/10th driving conditions. (again, probably the cold ambient temps)

PS. Too bad I didn’t find that Z4 test mule again while on the DRs and 100 octane!

[bandido]

Great Info and map comarisions. How many miles on the car at this point?

[veightkiller]

Nice job!