|
|
11-23-2010, 01:46 PM | #1 |
Resistance is futile...
54
Rep 640
Posts |
BMW s35i vs s35is
So, does anyone know if it IS true that the 35is has a redesigned less restrictive Air-intake and has different DCT programing to make it more responsive and to have better rev-matching in upshifts?
I am asking because i have an appointment with my BMW's dealer chief mechanic this friday to retrofit/upgrade some parts on my Zed. No speculations please
__________________
An ounce of performance is worth pounds of promises.
|
11-23-2010, 02:25 PM | #3 |
Resistance is futile...
54
Rep 640
Posts |
Yeah, my BMW mechanic said its not an "official option" but he "can" do it. I just wanted some info about it before i go to them so i can search online to see if i can get the parts i need cheaper
__________________
An ounce of performance is worth pounds of promises.
|
Appreciate
0
|
11-23-2010, 03:43 PM | #4 | |
tuned
525
Rep 696
Posts |
Quote:
__________________
|
|
Appreciate
0
|
11-23-2010, 04:29 PM | #5 |
Captain
27
Rep 805
Posts
Drives: 2011 Z4 35is Melbourne Red
Join Date: Jun 2010
Location: Portland, OR
|
Not 100% certain but I believe the air box on the "i" and "is" are the same.
|
Appreciate
0
|
11-23-2010, 04:41 PM | #6 |
Resistance is futile...
54
Rep 640
Posts |
The iS on the other hand receives 340hp at 5,900 rpm from an even further tuned N54 engine architecture. Increased boost is responsible for the power jump, along with higher torque output: 332 lb-ft available from 1,500 rpm with an additional 37 lb-ft available for temporary boosts of acceleration bringing the total torque output to 369 lb-ft with foot-to-floor. This increased performance is secondary to a larger, free-flowing intake manifold, increased peak turbo boost, a new high-flow exhaust, and reworked engine management.
I've read about it in alot of magazines that the IS has a bigger airbox. This quote is from BMWBLOG. source: http://www.bmwblog.com/2010/09/10/bm...4-sdrive-35is/
__________________
An ounce of performance is worth pounds of promises.
|
Appreciate
0
|
11-23-2010, 04:43 PM | #7 |
Banned
138
Rep 2,042
Posts |
I have been researching this very thing. RealOEM shows that not only the intake is the same but also the (MORE importantly) the charge air suction piping, which is actually quite restrictive. Some guys on N54tech are looking at replacing it for gains of around 20whp!
The 35is also is supposed to have a lighter dual mass flywheel. There is NO OFFICIAL information on the 35is from BMW which makes me suspicious. Who knows where these journalists are getting their info from? The 335is actually does have a lighter flywheel to cope with the extra torque (this is the reason BMW have given) plus upgraded cooling etc. |
Appreciate
0
|
11-23-2010, 04:51 PM | #8 |
Resistance is futile...
54
Rep 640
Posts |
20 whp from this intake? Sure if you threw a little itsy bit of nitrous in there lol Just too optimistic. 7-8whp sounds more like it The fuel consumption would be MUCH higher on the IS in comparison with the 35i if the "IS" intake manifold would be THAT much more less restrictive...
I believe about the lighter flywheel because of the torque with the overboost function. I just want the damn DCT software so i can move along and be in piece with my flash tune...
__________________
An ounce of performance is worth pounds of promises.
Last edited by Constant.S; 11-23-2010 at 05:01 PM.. |
Appreciate
0
|
11-23-2010, 06:43 PM | #9 |
Banned
138
Rep 2,042
Posts |
I think I was misunderstood. The guys are looking into developing different charge pipe tubing (the pipes that connect to the turbo and one side of the intercooler) as apparently that will give them the gains of 20whp. If you have a look it is a squarish shape on some N54 models and very restrictive.
|
Appreciate
0
|
11-23-2010, 07:10 PM | #10 | |
Resistance is futile...
54
Rep 640
Posts |
Quote:
Well, i trully have no idea how much gains that kind of fabrication would have, and it needs alot of R&D to make air flow efficient and maximized in such a development. I wish them best of luck
__________________
An ounce of performance is worth pounds of promises.
|
|
Appreciate
0
|
11-23-2010, 07:58 PM | #11 |
Captain
27
Rep 805
Posts
Drives: 2011 Z4 35is Melbourne Red
Join Date: Jun 2010
Location: Portland, OR
|
Intake manifold is not the same as the air intake box. I really doubt BMW developed a special intake manifold just for the "is" cars. The 35hp difference from the "i" tp the "is" is tuning and boost, nothing more. JB, Dinan, and others have proven that there is a ton more h/p with nothing more than tuning.
|
Appreciate
0
|
11-23-2010, 08:16 PM | #12 | |
Resistance is futile...
54
Rep 640
Posts |
Quote:
__________________
An ounce of performance is worth pounds of promises.
|
|
Appreciate
0
|
11-26-2010, 11:50 PM | #14 | |
sportscars only
3244
Rep 3,195
Posts |
Quote:
Why is that a good thing? |
|
Appreciate
0
|
11-27-2010, 01:37 AM | #16 | |
Colonel
62
Rep 2,087
Posts |
Quote:
On the other hand, you'll note from the photograph, as the car was accelerating out of the turn, it began to lift the front tire and you could see "daylight" under the tire. That result from a very car stiff frame, excellent lateral (sideways) tire grip and a lot of axle torque. Again, a stiffer sway bar would flatten the car's stance through the turn. Regardless, lifting the tire through the turn is pretty exceptional, especially considering the car doesn't have a limited slip differential. Here's a couple of 'tube vids. The 1st one is humorous with Richard Hammond being dumb. The second one is a bit more informative with Tiff Needell
__________________
"Political correctness is a doctrine fostered by a delusional liberal minority and rabidly promoted by an unscrupulous mainstream media which holds forth the proposition that it is entirely possible to pick up a turd by the clean end".-- Unknown
Last edited by teagueAMX; 11-27-2010 at 10:09 AM.. |
|
Appreciate
0
|
11-27-2010, 08:36 AM | #17 |
Captain
607
Rep 969
Posts |
I'd say lifting a tire on an open roof car is extremely exceptional. That is an indicator that the body is very stiff indeed. Most cars of this type almost always have poor torsional stiffness, and are noodly enough that they won't be lifting tires regardless of other factors.
|
Appreciate
0
|
11-27-2010, 02:02 PM | #18 | |
sportscars only
3244
Rep 3,195
Posts |
Quote:
|
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|