I took my 95 E36 M3 to the dyno yesterday. The dyno is a Clayton Industries in ground unit.

-Temp was around 90 degrees
-Location is Orlando FL, so pretty close to sea level
- 93 Octane
-Diff is stock 3.15... pulls done in 5th
-I requested runs to not exceed 6500 rpm... I try not to exceed that amount myself usually so I figured that was sufficient as I really wanted to see the power curve v. trying to get peak - though that is of interest too.
-One pull was also measured/calc based on speed, graphs were almost identical.

Peak WHP - 252
Peak TQ - 213

I did some research on dynos as I never heard of Clayton... usually see/hear about Mustang or Dynojet. One article I found online did a dyno machine comparison using a single car on the same day and the Clayton registered higher than the rest... of course there are always lots of variables but wanted to add that in.

Here's the graph... there are two dips... one before 4000 and one right after 5000... is that vanos related? I'd appreciate any feedback/input on the graph, #'s, etc... - thx. I've been considering cams, larger injectors, sw (after new diff ratio and other items)... just not sure its worthwhile $/benefit ratio.

http://i42.photobucket.com/albums/e334/m3extrafast/DynoRun.jpg

mod list?

mod list?

I bought the car in Jan. this year, it has 140,xxx miles now. I have not done any engine work since owning it (main focus has been on weight reduction and suspension). Will be replacing the spark plugs this month. Per the previous owner, it has the following:

Turner underdrive pullies
Jethot headers
AA track pipe which flows into a borla exhaust... (considering switching to a single 3" pipe off of the track pipe back v. the curent design that splits into two)
3.5" HFM
Intake, not sure which brand, green cone
AA software - I believe

Stock cams
Stock injectors
Stock flywheel

I think that covers it... does that help?

Hmm...and it hasn't peaked yet at 6500.

Horsepower curve and peak seem fishy--that's insane power for the motor being untouched internally and with catalytic converters!

WOW thats unreal power for those mods. Congrats

Track pipe means no cat

WOW thats unreal power for those mods. Congrats

Unreal as I wouldn't trust those numbers. I'd go to a dynojet so you can at least have somewhat comparable numbers. All of the IP/GTS3 guys here can tell you what their hp/tq numbers are to compare to.

252 for HP with 213 tq doesn't sound right at all, especially given the mods. That should be a 220 hp/ 210 tq car given it's a 3.0L. To get to 250ish numbers you'd need a 3.2L with cams + the tuning on an otherwise stock motor (not rebuilt). At least from the numbers I've seen on Dynojets.

Carlos.

thats gotta be corrected for crank hp.

other wise :eyecrazy

Track pipe means no cat

Missed that--gotcha. :)

I've only seen one motor with stock cams break (250.5whp as I recall) and that was a 3.2L at ~11:1 c/r, head work, 5-angle, etc.

I'm not refuting his dyno plot, but the horsepower curve is way high for the given setup. Could very well by Crank HP as Andrew mentioned

Thanks for the thoughts, feedback, etc... I'm of the same opinion - I don't have confidence in those numbers. I'm going to make a trip (eventually) to another place with a different machine. These figures are suppose to be wheel not crank according to the shop I got it done at. I was very surprised, however the guys there said its the most power they've seen any NA E36 M3 put down... but then again perhaps it wasn't setup properly, calibration is off, or some other variables occurring. The article I found did have the Clayton displaying roughly 10WHP higher than the other dyno machines tested... so perhaps I'm really down in low 240s or high 230s?

The shop, Irish Mike's, where I had the dyno done does lots of race car builds and tuning there... including running their own E46 in ITS... :conf

Besides the peaks numbers... anything else strange/interesting about the curves?

Ok... I went to another place... they had a dynojet...

Ran two runs... almost identical plots... which is good to see the consistency:

227.33 WHP
216.51 WTQ

I know the dynojets are on the optimistic side... but I couldn't find a mustang dyno close by. No escaping the heat here in FL... was about 86F during the run.

http://i42.photobucket.com/albums/e334/m3extrafast/scan0002.jpg




My AFRs were higher than 13...

2000 rpm AFRs were about 15... then trends down to 14 and stays flat at 14 from 3500 to 5500, then dips to 13 around 6000... then trends up slightly to 13.5 at 6800.

I was going to question the first plot because the curves don't cross at 5252rpm.

The second set looks much more realistic. Though I would investigate some different software to adjust your air/fuel ratio.
-Ted

I was going to question the first plot because the curves don't cross at 5252rpm.

The second set looks much more realistic. Though I would investigate some different software to adjust your air/fuel ratio.
-Ted

Yes, I know... it has AA software... not sure how longs its been in place or why its off the mark... I bought the car in Jan. this year and haven't touched the engine beside installation of new mounts (Vorshlag - very nice)... everything else was done by the previous owner so its possible its been over a year or more with the AFRs as such ??? Runs fine though... no audiable or otherwise indications coming from the engine but it does need to get addressed.

That second plot looks more accurate.

You should consider upgrading injectors and then have your software tuned based on the AFR.

I would expect something in the 230-240RWHP range with a 3.5"HFM, 3.5" intake, and 24lb injectors with proper tuning.

You're going to need cams to break into the 250's.

I was going to question the first plot because the curves don't cross at 5252rpm.

The second set looks much more realistic. Though I would investigate some different software to adjust your air/fuel ratio.
-Ted

If the scales are not equal then the curves will not cross at 5252.

Hey M3tony. I had the same problem that you are having with a dip in power when i was cammed na. I lost 30 whp around 3-3500k rpm. What i did was grounded the vanos so it was on all the time. i went from 198whp to 220whp. I would try to ground your vanos and see if that fixes your problem. i would bet it does. if your interesed email me at chuck@bmwmotorworx.com and ill send you my old dyno's.

-Chuck