Think I surprised an M4 driver.......
- Thread starter Axelf
- Start date
stuartinzg
Active member
Axelf said:Oh that's just great... I love it when other people have similar story's .. It's just like a wolf in sheep clothing haha, yes the pops and crackles are great
https://youtu.be/eLQKdWkeZ4s
... And with downpipes and a basic map
stuartinzg
Active member
techathy said:
You poked the diesel bear
techathy said:
The numbers seem to indicate otherwise !
But in a real word scenario there will be absolutely nothing in it.
335 d
* Engine: 3.0-litre 6cyl turbodiesel
* Power/torque: 313bhp/630Nm
* Transmission: Eight-speed automatic, four-wheel drive
* 0-62mph/Top speed: 4.8s/155mph
* Economy/CO2: 49.6mpg/151g/km
35is
In-line 6cyl, 2979cc, turbo
Max power
335bhp @ 5900rpm
Max torque
369lb ft @ 2500-5000rpm
500Nm
0-60
4.8secs (claimed)
Top speed
155mph (limited)
35is = more power
335d = more torque
stuartinzg
Active member
ronk said:
But ronk, my car is ~370 standard and pulls from a new 911 carrera. The figures for diesel are usually correct, but for the BMW turbo petrols they are massively under rated. I had a 320d which was mapped to 220, but a 125i was as quick.
In reality there maybe only 1-2 car lengths in it though - it takes a huge power advantage to really show much difference.
There’s approximately 10250Nm under the 35iS’s torque curve (looking at 250rm slices). In comparison The 335dX has 9000Nm under it’s torque curve. This is using information from BMWs published torque curves. If we look at dyno figures that’s more like 12000 and 9300Nm for the 35iS & 335d respectively. I'd say the 35iS has a lot more torque than the 335d.
As for acceleration the 35iS is a sub-4.5s car from factory, the 335d is struggling to get into the 4.5 in the real world. And with a standing start there's that AWD traction advantage. If you look at 30-80mph through the gears then it’s 6.1s for the 335dX where the 35iS posts 5.2s.
As for acceleration the 35iS is a sub-4.5s car from factory, the 335d is struggling to get into the 4.5 in the real world. And with a standing start there's that AWD traction advantage. If you look at 30-80mph through the gears then it’s 6.1s for the 335dX where the 35iS posts 5.2s.
The diesel will have lots of flywheel torque but at the wheels I think the 35is has more. Diesels always feel quick which is why there are so many acolytes on forums making comparison with the petrol models.
I think 370bhp is a little generous for the 35is. If it's 11psi in stock form I think the 340 they quote won't be too far off.
From baseline dyno and tune dyno comparisons it usually ends up being about 14bhp per PSI gain. So 302bhp for the 35i at 8PSI, 3 more PSI in the 35is would be around 344bhp. Of course that's just a rough guide but proves fairly true when applied to tuned cars.
I think 370bhp is a little generous for the 35is. If it's 11psi in stock form I think the 340 they quote won't be too far off.
From baseline dyno and tune dyno comparisons it usually ends up being about 14bhp per PSI gain. So 302bhp for the 35i at 8PSI, 3 more PSI in the 35is would be around 344bhp. Of course that's just a rough guide but proves fairly true when applied to tuned cars.
stuartinzg
Active member
R.E92 said:
Lots of 1M cars showing 350-370 stock
https://youtu.be/76GBzDz3WQQ
Just do a quick Google -380@12psi etc
More boost doesn't mean more power if the temps are bought down
http://www.caradvice.com.au/120924/video-bmw-1-m-coupe-makes-247kw-at-the-wheels/
No I'm not. I'm actually ignoring peek torque as it's a useless comparison due to the rev-range differentials of the 35d & 35iS engines. I'm also not look at peek power with much significance as that's more to do with top speed. I'm using a comparison which is the amount of work the engine is capable of doing over the entire rev range. I'm then backing up that theoretical advantage with real-world measured performance.ronk said:Your mixing your data sources and analysis of that "data"
stuartinzg said:
I saw one putting down 370 on a Dyno Dynamics in a youtube video so you're right that the 1M comes with way more power than it's quoted.
Interestingly the BMW PPK for the 335i has identical fuel and timing tables to the 1M and the load targets are very similar so they should be putting down the same power.
I don't have a stock Z4 35is BIN file to compare to the 1M. Did you do a backup of your stock ROM with MHD?
stuartinzg
Active member
R.E92 said:
I haven't mapped it yet, I want to get the brakes, suspension and cooling sorted first. Not in a rush to be honest.
I'm happy that the new springs have made it more planted, it wheel spins less now
On a consistent but pessimistic rolling road my 35iS put down a bit under 360hp. This same rolling road was round 2hp down on a 54hp engine & 5hp down on a 153hp compared to was recorded on rolling road days. So that's what around 3-3.5% under-reading. That puts my car car near 370hp.R.E92 said: