Dyno's for stock and modded 540i's?

[Ahheck01]

I'd really like to see the '95 540i'6's dyno curves stock, and also see what certain mods do to the curves. Ideally, I'd like a stock dyno, dyno with just software, dyno with software and intake, dyno with software, intake and exhaust, and a dyno with software, intake, removed or high flow cats, and an exhaust.

Basically, those are all the steps I would take, and I want to know the affects of each on my torque/hp curves, as those are really what tell the story from idle to redline.

Post up what you have!

-Evan

[E34nication]

http://www.tamparacing.com/photopost/data/500/medium/9366krisdno_copy.jpg

stock. only dyno chart i have.

[Ahheck01]

Awesome. Now I need to know what mod/combination of mods will make it look most like this:

[MaloventEvil]

here are my stock dyno runs (same session)

http://people.ucsc.edu/~amahbod/images/dynoplot1.jpg
http://people.ucsc.edu/~amahbod/images/dynoplot2.jpg

[E34nication]

here are my stock dyno runs (same session)

http://people.ucsc.edu/~amahbod/images/dynoplot1.jpg
http://people.ucsc.edu/~amahbod/images/dynoplot2.jpg

fixed

[MaloventEvil]

you should be able to achieve that goal with just a chip.

[E34nication]

Awesome. Now I need to know what mod/combination of mods will make it look most like this:

honestly it will probably take a set of custom ground cams and some custom tuning... maybe some good head work. Don't think you're going to be seeing top end 20+whp gains in this car from bolt-ons.

[Ahheck01]

honestly it will probably take a set of custom ground cams and some custom tuning... maybe some good head work. Don't think you're going to be seeing top end 20+whp gains in this car from bolt-ons.

It's more just the drop-off that I'd like to get rid of... at least getting the torque curve to stay flat after its peak instead of dropping. That's what I'd most like to achieve. Any power gains aside from that would be great, but less important to me.

-Evan

[Craig S]

Ha. Don't remind me. :(

http://www.535i.net/random/BMW/dyno/dyno/DSCN2866.JPG

[E34nication]

It's more just the drop-off that I'd like to get rid of... at least getting the torque curve to stay flat after its peak instead of dropping. That's what I'd most like to achieve. Any power gains aside from that would be great, but less important to me.

-Evan


tough to do... torque curve really only starts falling a little over a thousand rpm's before redline. Not too bad IMO for a relatively small v-8. My dyno was bumping the car off the rev-limiter which is ~6500rpm's. Shows that it is not beneficial to run it past 6200 or so... only times I do that is if I am trying to hold a gear in an autocross or something which in that case I will run it all the way to 7k (limiter bumped up with a chip). I still don't think you're going to achieve that kind of TQ gain at high rpm's (or horsepower for that matter) with simple bolt-on's but God knows I would love to be wrong.

[clevertd]

To get the horsepower curve the way you want, add this: http://www.esstuning.com/default.asp?c=shop&cat=93&subcat=180&subcat2=183&id=

:devillook

[MaloventEvil]

To get the horsepower curve the way you want, add this: http://www.esstuning.com/default.asp?c=shop&cat=93&subcat=180&subcat2=183&id=

:devillook


the power delivery of that kit isnt that great from what i hear... that's why i'm working on a turbo setup :stickoutt

[MaloventEvil]

to the OP, i dont understand what the problem is... the target dyno you posted is approx 10whp higher than the stock dyno... toss on some underdrive pulleys and a chip and you should be there.

[E34nication]

to the OP, i dont understand what the problem is... the target dyno you posted is approx 10whp higher than the stock dyno... toss on some underdrive pulleys and a chip and you should be there.

10whp while not all that easy isn't the real problem. That flat torque curve that he drew is a gain of around 25wtq which would translate to a lot larger gain than 10whp. (again if this is false please call me out... I am just assuming that due to the hp/tq relationship w/o an increase in displacement a gain of torque with an unproportional gain in horsepower is simply not possible but then again I have never built an engine so what do i know:stickoutt)

Also with my current state of mods: intake/exhaust w no cats/chip (conforti)/fw i picked up roughly a 2whp/2wtq gain... not exactly staggering. Granted this was a different dyno than the dynojet 246c I originally dyno'd on and it was a bit warmer out. I don't know where that dyno chart has gone, though. I also have not taken the car back to the drag strip (i autocross) since the one time i took it there with just the chip but the car does feel stronger. In addition to that, there are cars that I had raced before that I raced again and on average gained about a car length to a car length and a half... so as inconclusive as that is you can take it for what it's worth.

This is why I stick to my guns on the 3.15lsd/lightweight flywheel being the best straight line bang for your buck combination of mods. I don't feel there is much to be gained from these cars with bolt-on's (short of a bolt-on supercharger kit).

[Craig S]

What did you run at the strip?

[clevertd]

If you want the graph to look like what you have, use the math

HP = (Torque*RPM)/5252

To have 250 ft-lbs at 6300rpm, would mean you had a HP number of 300 at 6300. I'd approach it with some head work and aggressive custom cams.

[E34nication]

What did you run at the strip?

When I ran I just had the chip... and crappy 15" mxv4's w/ about 25% tread. Went 14.065 @ 101.75 w/ a 60' in the 2.2xx range. Have a video of it somewhere... you can hear the tires trying to break all through first, having trouble hooking a bit in 2nd, and then chirping 3rd... traction was not my friend.

also should be noted that i was running the car to 7k rpm's in 3rd and hitting the rev limiter probably about 50ft in front of the traps...

[Craig S]

That's very respectable. The best I could get my stock '96 Cobra to run was about the same ET with only about 98 mph trap speeds.

Also running through the traps in third. :)

[MaloventEvil]

When I ran I just had the chip... and crappy 15" mxv4's w/ about 25% tread. Went 14.065 @ 101.75 w/ a 60' in the 2.2xx range. Have a video of it somewhere... you can hear the tires trying to break all through first, having trouble hooking a bit in 2nd, and then chirping 3rd... traction was not my friend.

also should be noted that i was running the car to 7k rpm's in 3rd and hitting the rev limiter probably about 50ft in front of the traps...

what mods did you have at the time?

[E34nication]

just a chip. everything else was stock in the car except for eibach springs.