So then 5.0s 0-60 is feasible then, I assume?

 

Sorry but I need to clarify a couple points. As a general rule, drive train loss is around 15% for manual transmissions and 18% for autos. At 384 crank hp, the wheel hp for a manual car is at best around 326hp give or take, not 360. For a Steptronic, it should be lower at around 315rwhp. Same DT% and math applies to torque.

Also, the 550's 360hp and 360ft-lbs are at the crank, NOT at the wheels.

As for acceleration numbers, I definitely think the 535 with the software could possibly obtain sub 5 sec times but the 535Xi is a bit heavier due to the all-wheel-drive but yeah, I think 5 sec is a possibility.

 

Isn't AWD quicker off the line, despite the weight? I mean later on the weight sets in, but I've read AWD is slightly faster despite the added weight.

 

Good point. I checked BMW's website and here are some specs between the 535 and 535xi:


535 w/Manual: 3660lbs
0-60: 5.6s

535 w/Steptronic: 3703lbs
0-60: 5.7s


535xi w/Manual: 3902lbs
0-60: 5.5s

535xi w/Steptronic: 3946lbs
0-60: 5.6s

 

The 550 and 535 output numbers are at the rear wheels, BMW is required by federal law to do it this way. I looked at the Dinan White Papers and it lists a 10.8% drivetrain frictional loss at 4300 RPM and 12.2% loss at 5700 RPM. That adjusts the 421 ft/lbs at 4300 RPM to 380 rear wheel ft/lbs and adjusts the 384 hp at 5700 RPM to 343 rear wheel HP.

 

Just checking. I think a .7 increase in 0-60 is plausible in a 535xi with a stage 2 Dinan. Time to save up some cash.

And as for the wheels, I really wish there was one of those applications on the website that let you see the rims you choose and how they would look on your car. Not many sites have those.

 

What are you trying to accomplish, do you plan to go drag racing or do you just want to make you car more powerful than stock. ?

 

More powerful than stock. I don't need something that's no longer drivable, though, so I'm not going to go beyond 400 hp and torque. I just want the 0-60 in the 4's to compete with the other cars in my area, but at the same time, I'm no drag racer. Just want to have some punch in case it ever comes up to use it.

In addition to Dinan, I just took a look at Vishnu's Stage 0 ECU remapping and I think it increases the hp by close to the same as the stage 2 dinan but is cheaper by quite a bit.

 

One note on the Dinan is you have to have the AUX oil cooler. There has been some debate on whether or not the XI's have it or if it even comes with the sport package on them. If you don't have it , the Dinan one is like another 2k plus install in think. The n54 in the 3 series this was a big issue on the 07's. I thought on the 08's with the n54's they all were to have it. but some recent purchasers of the E60xi's say that their cars don't.

Just some thing you may want to look in to.

 

I'm not sure where you're getting this info but BMW numbers are not at the wheel, they are crank numbers just as all other manufacturers. For example, BMW's spec for the M5 is 500hp but everyone that has dynoed their car have gotten anywhere from below 400rwhp to about 430rwhp, depending on which type of dyno. Some dynos are more conservative like the Dyno Dynamics machine and some will show better numbers like Dynojets. It also depends on the setup. Dinan's dyno has probably one of the biggest fans out there similar to something they'd use in a wind tunnel. It's supposed to more closely replicate real world conditions. On the other hand, the place that dynoed my car had one of the smallest fans I've ever seen and it was only pointing at my lower grill at the radiator.

As for DT losses, the 15-18% I spoke of is just a general guideline and have been used as a rule of thumb for years. I guess technology has improved quite a bit and DT losses have decreased through better engineering. If those are the numbers Dinan believes to be the correct values, that would be awesome.