DASC HP/Torque Flywheel curves

[pnosker]

I compiled all the dyno sheets that came with my car from the PO (Chris and Lisa Bethel of Understeer.com) and applied a 1.16 factor correction (Should be either very very close or exactly right-- the stock motor turned up 140 hp corrected which is in the range of 138-140 official rating). Soon, I will update with an image of my final pulley and water injection which should give between 16-17 psi.

Anyway, to those considering the DASC or with one, please enjoy.

The car in both DASC instances had a Stromung exhaust. Stock DASC had the stock airbox but fogged, and the TT S3 DASC has an AFE filter and heat shield made of aluminum/carpet.

[sokat1989]

there are 6 curves on the graph and 8 items in the legend...

[xxxJohnBoyxxx]

You will beat 200hp with a 3.2 pulley and meth. Although I didn't dyno, my track times and weight made it impossible for my car to run in the high 13's @ under 200hp.

I'm telling you your going to be smiling from ear to ear. The 3.2 and meth really wakes up that combo

[pnosker]

The 8 items are because I'm going to dyno with higher psi + meth injection. I haven't gotten the hp/torque for that yet so they're on the excel sheet but no data yet.

[96cali]

So stock DASC hp with a fogged airbox is over 200? Something seems wrong there. Your lines/graph is really hard to read though cuz the lines are so thin.

[cooljess76]

Originally Posted by 96cali

So stock DASC hp with a fogged airbox is over 200? Something seems wrong there. Your lines/graph is really hard to read though cuz the lines are so thin.

Hey Phil, just click on the bar at the top of the image for the full sized view

[pnosker]

That's to the flywheel. And yes, that's what it should be. I haven't personally ever driven a non Stage-3 DASC'ed ti however.

Here's the actual dyno readings to the wheels.

[marko]

ok. so, can someone please dumb down the true / accurate calculation of the loss of HP between the flywheel & the road, for me??

do we loose 10%, 15%, 20%???

teddy from MM states as high as 30+% loss, but on bfc I read only about 10-15%...

I.E. if my car comes home with 200WHP - what is that in terms of the brochure / advertised HP?? 210 / 220 / 230 HP?

someone please clue me in.. LOL

[pnosker]

According to my calculations, it's 16% loss. Take a look at the graphs. Stock ti's have 138-140 hp (with the M44). The RW graph shows around 121 hp to the wheels (and that's exactly what my dyno chart that I have at home says too). Corrected for Flywheel HP, it's 140. So that's a 16% difference.

Of course, the dyno type matters. All of these were done on the same Dynojet calibrated the same in the same conditions (around 85 F with low humidity). I'm going to dyno my smaller pulley and meth injection on a Dynojet to try to get a similar baseline.

The truth is, DASCed ti's put around 222 hp to the flywheel and around 188 ft-lb torque.

That's 191/162 to the wheels (as per dyno chart).

NA ti's produce 138-140/133-135 to the fly, and 121/116 to the wheels.

Stage 3 ti's produce 233/198 to the fly or 201/171 to the wheels.

[96cali]

Originally Posted by cooljess76

Hey Phil, just click on the bar at the top of the image for the full sized view

yesh, i did that too. just sayin it's ok to use more than a half point line width. But I'm being nit picky, glad someone documented and published this. Thanks pnosker! Still jealous you got Lisa's car.

[pnosker]

It's 1pt actually. It was at 2.25 default but it looked huge and with 8 lines it got messy. And yeah, after the rust is cleaned up around the fenders, it will be PERFECT!!!

[pnosker]

I updated the dynos because I went to Crazy Horse Racing in South Amboy to dyno today and got some good numbers . My spark plug wires need replacing (they're jumping at 4500 rpm)... had to re-dyno with jerry-rigged Mustang wires. Anyway... I'm pretty happy. 231 RWHP and 184 RW ft-lbs torque. Time to kill some M3's :-D. I just need to put my 3.25 lsd on.

[mgbman69]

That's a pretty linear Tq curve you got going there. I bet that is one fun ride!

Thanks for documenting this. Makes the geeks like me happy, gotta love the data

[xxxJohnBoyxxx]

Originally Posted by pnosker

I updated the dynos because I went to Crazy Horse Racing in South Amboy to dyno today and got some good numbers . My spark plug wires need replacing (they're jumping at 4500 rpm)... had to re-dyno with jerry-rigged Mustang wires. Anyway... I'm pretty happy. 231 RWHP and 184 RW ft-lbs torque. Time to kill some M3's :-D. I just need to put my 3.25 lsd on.

That's putting down some BIG hp for the turd of BMW performance I bet now you just drive around hoping someone will pull up and try you. Even the ricers with fart cans get waxed, no one gets a car on you at any light.


Am I right?

Your dyno is spot on with what your combo should make during the summer. In the winter watch for less HP which is a sign of those 30# injectors not being able to keep up with the extra fuel needed for the denser more powerful air + added boost from colder air

[pnosker]

Well... not exactly. My differential makes my car not quite as fast as I wish it was. The stock ratio is 3.45, I'm running 2.93, so it takes a little bit for the power/torque to come down. Also, I'm back to my old Magnecor wires which are jumping around 4500 rpm. The first dyno, with those wires, showed that they were stealing a lot of power/torque. It stole around 20 ft-lb torque after 4500 rpm and made my peak HP at 193.4 hp instead. Anyway, I'm getting my Magnecor's replaced under warranty so it's not a big deal.