Ah-ha! Who has been having fun at the dynojet???

Not too bad at all. Now, what you really should have done is get a baseline run for the car before the mods were installed. But that's pretty obvious.

The 17% figure has been the standard with BMW's for years, but those have all been stick. I have no idea what the Step loses.

Hmmm, maybe that's what I'll do this year. I've never dyno'd my car before, I think it's time to start.

PS - You ordered a switchtronic wheel and SMG paddles?

I should have dyno-ed the car stock. But these dyno sessions organized by the BMW LA CCA appear too often.

Anyway, 17% is just being quite conservative. I could use 20% for Step loss. That would mean I have, at the crank, 210 HP and 202.4 ft-lbs which I refuse to believe. :tsk:

Huh? Switchtronic and paddles?? M wheel with paddles is just to test out my paddles retrofit project. If that works, I will use the Switchtronic wheel. M wheel with then find its way to a new owner!

Mystikal said:

Not too bad at all. Now, what you really should have done is get a baseline run for the car before the mods were installed. But that's pretty obvious.

The 17% figure has been the standard with BMW's for years, but those have all been stick. I have no idea what the Step loses.

Hmmm, maybe that's what I'll do this year. I've never dyno'd my car before, I think it's time to start.

PS - You ordered a switchtronic wheel and SMG paddles?

Click to expand...

notorious underraters.

but that's a good thing.

it's a very efficient driveline, the inline six with less parasitic frictional losses compared to a v6 setup....and typical germans.

they aren't ford or mazda: they would never overstate their numbers.

so, it's a combination of both, right? strong motor, some mild tuning, and a conservative company. they also wouldn't want it to be known that their bargain priced 3 series is that much closer to their 328, would they?

c'mon. no one would pony up the extra money.

Re: notorious underraters.

Good point. And I do believe they lowered the numbers for 325i so as to set apart from 330i. We have a 41hp difference based on the marketable tech specs. A very obvious move when they badged the M52TU 2.5L as a 323i.

blackdawg said:

but that's a good thing.

it's a very efficient driveline, the inline six with less parasitic frictional losses compared to a v6 setup....and typical germans.

they aren't ford or mazda: they would never overstate their numbers.

so, it's a combination of both, right? strong motor, some mild tuning, and a conservative company. they also wouldn't want it to be known that their bargain priced 3 series is that much closer to their 328, would they?

c'mon. no one would pony up the extra money.

Click to expand...

I can only imagine the difference of sales of 323 vs. 328 compared to 325 vs. 330. The feel of driving the former pair was just way too close to the average buyer.

Some say that the 323 was underrated from the factory, relative to other BMW's. When I dyno my car I'll see if there's any truth in that.

Hey Nate, what numbers does your car put down?

Mystikal said:

I can only imagine the difference of sales of 323 vs. 328 compared to 325 vs. 330. The feel of driving the former pair was just way too close to the average buyer.

Some say that the 323 was underrated from the factory, relative to other BMW's. When I dyno my car I'll see if there's any truth in that.

Hey Nate, what numbers does your car put down?

Click to expand...

I haven't dynoed my car. Maybe, I will

Vince's HP readings are less than 1.5HP higher than a stock 328i, that Eissman exhast really adds a lot, eh? :thumb: His torque rating is way less than a stock 328i. According to Dinan, with my software and intake, I should have 202 or so HP and 215 lb-ft at the crank :dunno: So, maybe 174hp and 187 lb-ft at the crank :dunno: Then again, ECIS gives those numbers as stock :dunno: http://www.ecisbmw.com/dyno_files/00328cidyno.htm

Edmunds dynoed a '99 328i

166.8 horsepower @ 5,500 rpm
180.8 foot-pounds @ 3,700 rpm

http://www.edmunds.com/ownership/driving/articles/44824/page001.html

I'm Not Sure What To Make Of This...

I went to the same Dyno session that Vince went to. I have a 330Ci with Dinan CAI, Throttle Body and Stage I,II,III software. Here are my numbers:

Max Power: 194.9HP
Max Torque: 192.4 ft/lb.

OK, I wasn't expecting much from the mods. I never believed the numbers from Dinan and was expecting from 10-15HP. The numbers with the 17% drivetrain loss figured in show I have a bit under 235HP and Torque at about 232 ft/lb.

I know its hard to accurately Dyno a car. Also, I don't necessarily believe the Dyno and 2 fans blowing can show the full potential of the CAI. Nevertheless, I have heard of STOCK 330s getting over 200HP and ft/lbs of torque at the crank while dyno'd.

I regret not testing the car while it was still stock. At least I have a baseline for future mods such as exhaust, and maybe cams.

replies!

Another way to look at the numbers is to divide the measured figures by the listed ones. Then the aim is seen as *decreasing* the powertrain loss.

325i

listed

184 HP
175 ft-lbs

measured

168.1 HP
161.2 ft-lbs

Let us divide the measured figures by the listed ones.

HP: 91.35 %
Torque: 92.11 %

====================

328i from Edmunds

listed

193 HP
206 ft-lbs

measured

166.8 HP
180.8 ft-lbs

Let us divide the measured figures by the listed ones again.

HP: 86.42%
Torque: 87.76 %

===================

So it seems like the CAI and Eisenmann exhaust does help, meaning bringing us closer to the listed values at crank.

Bol: Actually it rained here few days ago...and my car is actually not that clean afterall!

Shinobi: Great to see you here finally! Well, one regret I have is not to bring along the OBD-II software to measure MAF. I'd say not too take these figures too seriously. Remember, we have to take into account when the dyno was last calibrated, the temperature and humidity of the air.

Nate: I think you should dyno the car before putting on the aftermarket exhaust. I am not sure how much Eisenmann contributed to the figures, but hey, two pple there uanimously agreed that my exhaust + intake sounded REALLY good! AutoX coming up end of month. One track event coming up in May. Ahh...the joy of driving. Nate, actually I am more excited about the Alpina steering wheel with Switch-Tronic. After bloody 7 months, I finally confirmed an order for it! Woohoo!

Re: replies!

VinceTopasBlau3 said:

Nate: I think you should dyno the car before putting on the aftermarket exhaust. I am not sure how much Eisenmann contributed to the figures, but hey, two pple there uanimously agreed that my exhaust + intake sounded REALLY good! AutoX coming up end of month. One track event coming up in May. Ahh...the joy of driving. Nate, actually I am more excited about the Alpina steering wheel with Switch-Tronic. After bloody 7 months, I finally confirmed an order for it! Woohoo!

Click to expand...

Yea, it does seem like the mods have made a big difference. Eismann is cat-back, right? Loud? You will do better at track than auto-x though Forget about the Switch-tronic, trade in for a manual

Thanks, Vince

Vince,

I've been reading up a bit on Dyno results. I've read that the positioning of the fan can cause a 5HP difference. Other factors you mentioned, plus the fact that not all engines are equal must be taken into account.

I'm on the fence again for exhausts. I'll contact you regarding this.

Next car I get, I will definitely dyno it before I make any mods. That of course, means I have to do it right after I drive off the lot = ).

hi vince. cool.

yeah, i don't know what to think about the edmunds.com dyno session and it's not so easy to compare dyno to dyno, let alone session to session, let along cars which have had their adaptations reset for the dyno session.

steve dinan plays with the voodoo a lot and usually only tells you about the first run before the heat soak starts in, too. he'll freely admit that.

the trends are clear though: BMW underrates their engines, but more often than not, that's offset by tuners overrating their mods.

dyno variation is killer, and OBD2 adaptation is stinky, too. my car can dyno (and has) from 272hp (crank) to 294hp. while that doesn't seem like much (same equipment, different days), it tells a lot about the variation in the process. has adaptation been reset? is the temperature cool? my car stock was 212. that is roughly 250hp or so, which is 10-11 above what BMW will cite.

it's fun, though, isn't it?

ps. want to be really impressed, you should see Z06 dyno numbers. talk about conservative power ratings.

hack: i think i'd be einsteinium.

it's more dense, isn't it?

(254) versus (209).

:thumb:

Replies..

Nate: it's EISENMANN!! Argh! Not Eissman or Eismann...Oh well, as long as you don't mis-spell ALPINA. That is A-L-P-I-N-A. Repeat, A-L-P-I-N-A.

Shinobi: Anytime you want to know about Eisenmann. Last I heard Bekkers might have raised their prices.

Hack: No 5th gear. Btw Pelly of Art Institute of Pasadena to set up design school at UC Irvine.

blackdawg: As a matter of fact, there was a Corvette there on Sat. Not a Z06 though. Numbers came out to be 240hp at wheels I think.