engine and drivetrain Dyno results street/race car

[BimmerBlooded]

Hello 02 friends,

I would like to share with the 2002faq community the dynamometer results of my '75 2002 street/race car (it's becoming more race than street), so we can all have a future reference or what to expect when building an engine.

The dyno is located in Guatemala City @ 1,533 meters above sea level, that's 5,028 ft.

Our race track is located @ 700 meters above sea level (2300ft)

Here's my recipe:

11.5:1 Forged pistons

lightened connecting rods

Light flywheel steel/aluminum 10lb

Ireland Engineering windage tray

Original BMW Sportcam 300° part # 11 31 0 631 009

Stock valves and springs

Ireland Engineering mechanical advance distributor

Total advance 38° @4000rpm

Pertronix

MSD 6AL limited @7000rpm (I believe more than that is overkill)

50% pump gas 95 octane and 50% AVGAS 100LL

Custom made header

2.5" open exhaust

2 Weber 40 DCOE

36mm venturis

140 main jet

F16 emulsion tube

190 air corrector

50 idle jet

40 pump jet

4.5mm aux venturi

The dyno result is very interesting because the hp curve stays almost flat from 5,500rpm until 6,850rpm where the MSD starts to cut the ignition.

It threw 112hp at the rear wheels and 108lb/ft. We all know that almost 15% is lost through the drivetrain, and we have to compensate the dyno's elevation, wich is aproximately another 15%. That gives us a total of 160hp at the flywheel (112 divided by 0.7) and 152lb/ft of torque.

Any comments, opinions or constructive criticism is very welcome!

Here are some photos of the most recent race we participated in, march 17th we finished 2nd place overall and 2nd in Vintage GT class.

I hope you all like it!

Jorge.

Dyno 04.04.2013.pdf

[BimmerBlooded]

More pics:

[Harv]

Cool.

I like your wheels.

John

[TobyB]

Nice- that's along the lines of what I found with very similar hardware.

My observations- and they're just that:

I found more power by running leaner than you are- as lean as 13:1 seemed

to work just fine, and pulled stronger.

I found that mine pulled well past 7500. I ran stock rods and bolts, so

I didn't let it go there much, but there was plenty of power.

You start to go lean at 6500- since your pull is on a DynoJet, I'd be making sure there

isn't a fuel supply problem, because your venturis and jets should be able

to supply fuel to 7500, at least

Again, this is just from what I found- and I'm at sea level.

Cool!

t