Dinan Software 8600 rpm redline

[Powerslide]

Just wondering if the Dinan software which raises the redline to 8600 changes the rpm\'s at which the S65 makes maximum hp or torque? I know that with the OEM software 295 lb/ft is reached at 3900 rpm, and max hp of 414 is reached at 8300...

[///M Ryder]

Here you go.......directly from Dinan..................Phil

Dinan E9x M3 Engine Software raises the factory rev-limit from 8400 to 8600 RPM*, endowing the V8 with a broader power band and greater road speed potential in each gear. The software also removes the top speed governor, enabling the cars to attain their ''natural'' top speed; and the V8 will pull right to red-line in top gear! Changes to the throttle mapping help soften throttle tip-in for a sportier feel and improved modulation capabilities. The combination of Dinan's re-calibration of ignition timing, fuel delivery, and cam timing produce a maximum gain of 9 hp @ 6000 rpm and 8 lb-ft @ 6000 RPM. Peak horsepower is increased from 414 to 421 at 7900 RPM. Rev-limit raised from 8400 to 8600 rpm in manual mode only for cars equipped the M Double Clutch Transmission. The rev-limit is unchanged for the M-DCT in automatic mode.

[crabman]

Interesting that they soften the throttle tip in. Some outfits like to ramp it up a bit on the bottom end to give some placebo effect on more power.

[DBH]

Originally Posted by crabman

Interesting that they soften the throttle tip in. Some outfits like to ramp it up a bit on the bottom end to give some placebo effect on more power.

You're right. Their software for the E46 M3 did in fact ramp up the throttle quite a bit. However, on the E9x's there is just a barely noticeable difference when you hit the sport button. The HP/torque boost is barely noticeable if you have a sensitive rear end. Ah, but the additional 200rpm is nice...

[N8dawg]

What is the "natural top speed'?

[BMW Fanatic]

Top speed (delimited) is 286kph (178mph) so with 6% error that translates to a 'natural' top speed of about 307kph (191 mph) [this is the value we would see on our speedo]. If anyone has gone above this with a stock engine then I'd love to know.

Originally Posted by N8dawg

What is the "natural top speed'?

[Jive]

Originally Posted by ///M Ryder

Here you go.......directly from Dinan..................Phil

Dinan E9x M3 Engine Software raises the factory rev-limit from 8400 to 8600 RPM*, endowing the V8 with a broader power band and greater road speed potential in each gear. The software also removes the top speed governor, enabling the cars to attain their ''natural'' top speed; and the V8 will pull right to red-line in top gear! Changes to the throttle mapping help soften throttle tip-in for a sportier feel and improved modulation capabilities. The combination of Dinan's re-calibration of ignition timing, fuel delivery, and cam timing produce a maximum gain of 9 hp @ 6000 rpm and 8 lb-ft @ 6000 RPM. Peak horsepower is increased from 414 to 421 at 7900 RPM. Rev-limit raised from 8400 to 8600 rpm in manual mode only for cars equipped the M Double Clutch Transmission. The rev-limit is unchanged for the M-DCT in automatic mode.

Are there any dyno charts available with just this software mod? I would love to see how it changes the curve considering peak hp would be at a lower rpm and peak tq at a higher rpm.

[turbo8765]

Originally Posted by BMW Fanatic

so with 6% error

How do you arrive at this number?

[bigjae1976]

Originally Posted by crabman

Interesting that they soften the throttle tip in. Some outfits like to ramp it up a bit on the bottom end to give some placebo effect on more power.

I find the E9X M3 throttle to be very touchy. I think softening up the electronics makes perfect sense.

[persian54]

Originally Posted by BMW Fanatic

Top speed (delimited) is 286kph (178mph) so with 6% error that translates to a 'natural' top speed of about 307kph (191 mph) [this is the value we would see on our speedo]. If anyone has gone above this with a stock engine then I'd love to know.

In Mexico, I hit 196mph speedo speed

but, the random M3 that I happen to drive somewhere in Mexico did have a pulley, filter, akra evo, OE tune.

[DylanMckay]

Was that in a vert too? Wow. So a coupe/sedan should be able to hit 200 easily with 500 less pounds you would think? Crazy!

[crabman]

Originally Posted by bigjae1976

I find the E9X M3 throttle to be very touchy. I think softening up the electronics makes perfect sense.

I made no judgment one way or the other, I was referring to the ol trick of upping the tip in to increase the sensation of power. Its a common thing with tunes from many outfits with many different cars. If you want a judgment in my mind it bodes well that they didn't take the cheap shot.

[aajami]

Originally Posted by DylanMckay

Was that in a vert too? Wow. So a coupe/sedan should be able to hit 200 easily with 500 less pounds you would think? Crazy!

Not sure if serious...

[DylanMckay]

Originally Posted by aajami

Not sure if serious...

Why take the time to post this?

Of course I was serious. It looked like in the posters sig he drove a vert and the vert is 400-500 pounds heavier. Therefore I was guessing that if he hit that speed in his vert than a coupe weighing 500 pounds less should potentially hit an even higher speed?

Maybe not, and maybe its all about aero at those speeds and little to do with weight of the car but I would think weight still has something to do with it.

[Mbauer]

Originally Posted by DylanMckay

Why take the time to post this?

Of course I was serious. It looked like in the posters sig he drove a vert and the vert is 400-500 pounds heavier. Therefore I was guessing that if he hit that speed in his vert than a coupe weighing 500 pounds less should potentially hit an even higher speed?

Maybe not, and maybe its all about aero at those speeds and little to do with weight of the car but I would think weight still has something to do with it.

Its not the weight... read carefully.... engine rpm was raised to hit natual top speed in top gear.... The car is limited by its final drive ratio not by weight.

[Ateam]

Originally Posted by Mbauer

Its not the weight... read carefully.... engine rpm was raised to hit natual top speed in top gear.... The car is limited by its final drive ratio not by weight.

huh?

We are talking about a post which stated he hit a certain top speed and was in a vert. My question was with the same tune and rpm and unlimited top speed the coupe/sedan potentially could be faster given a 500 pound difference.

Before you tell me to read you may want to read more carefully!

[Templar]

I would think weight only factors in when you're talking about acceleration, i.e. how quickly you can get to that speed.

[aajami]

Originally Posted by DylanMckay

Why take the time to post this?

Of course I was serious. It looked like in the posters sig he drove a vert and the vert is 400-500 pounds heavier. Therefore I was guessing that if he hit that speed in his vert than a coupe weighing 500 pounds less should potentially hit an even higher speed?

Maybe not, and maybe its all about aero at those speeds and little to do with weight of the car but I would think weight still has something to do with it.

Weight has no bearing on top speed.

And very, very few production cars can reach 200MPH, and the M3 is not on that list.

[DylanMckay]

Are you sure about that? While weight does not have nearly the same impact as it does when accelerating at lower speeds since the acceleration is much greater than when accelerating in very small increments when you approach 160 plus mph, it nonetheless still takes power to accelerate a mass regardless of which speed you are at. The effects are much smaller at high speeds because the acceleration is quite minute as you are accelerating very slowly as you inch up to higher speeds above 160 compared to the acceration of 0-130 mph or so.

Maybe 500 pounds does not effect things that much but was just curious!

[kitw]

Top speed is only power and aerodynamic drag. Weight only affects acceleration.

(there are minor effects, such as tire/friction due to extra weight but largely unimportant)

[DylanMckay]

Originally Posted by kitw

Top speed is only power and aerodynamic drag. Weight only affects acceleration.

(there are minor effects, such as tire/friction due to extra weight but largely unimportant)

How do you think you get to top speed? You need continued acceleration and acceleration is proportional to mass so it definetly has an effect. As I said at those speeds with the very low levels of delta in velocity on a second by second basis, the acceleration is relatively low and thus you probably do not notice the effect of weight as much but nonetheless it is still a component of the equation and an important one at that.

[kitw]

http://autopedia.com/stuttgart-west/...Physics06.html