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      03-29-2008, 05:21 AM   #1
mistermojorizin
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has anyone dynoed a 135 on a dynojet?

i just entered the numbers from the road and track tests of the 135 and 335 into a calculator that gives you crank hp from quarter mile times, speed and weight.

for the 335 sedan, it weighed over 3815 pounds and hit 13.5 @ 104.5
for the 135, it weighed about 3520 pounds and hit 13.4 @ 104.0

Now the calculator said the 335 is making 323 hp at the crank. which is inline with the 275hp at the wheels we've been seeing on dynojet.

For the 135 the result was 300hp at the crank. This is not in line with the dyno posted of the 135i which shows something like 279hp (done by MWerks i believe). But there is an explanation, this dyno was not a dynojet. it was a dyno that measure hp without the wheels.

So, are there any dynojet dynos of the 135i stock? If the calculator is accurate, they will be in the 250 to 260 hp range. I hope its wrong.
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      03-29-2008, 06:58 AM   #2
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I wouldn't worry about it. The 135i blows the 335i away as the speed increases above 80 mph. Both cars are have similar HP but are traction limited at lower speeds. The weight, aerodynamics and power of the 135i shine through at higher speeds. Nate
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      03-29-2008, 09:33 AM   #3
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      03-29-2008, 10:21 AM   #4
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Seems like the weights are a bit skewed as BMW specs the (manual) 335i sedan at 3594 lbs. and the 135i coupe at 3373 - a 221 lb. difference, not the 295 lbs. you quoted. Also, the sedan has a Cd of 0.30 vs. the coupe's 0.33.

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      03-29-2008, 11:05 AM   #5
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Quote:
Originally Posted by mistermojorizin View Post
i just entered the numbers from the road and track tests of the 135 and 335 into a calculator that gives you crank hp from quarter mile times, speed and weight.

for the 335 sedan, it weighed over 3815 pounds and hit 13.5 @ 104.5
for the 135, it weighed about 3520 pounds and hit 13.4 @ 104.0

Now the calculator said the 335 is making 323 hp at the crank. which is inline with the 275hp at the wheels we've been seeing on dynojet.

For the 135 the result was 300hp at the crank. This is not in line with the dyno posted of the 135i which shows something like 279hp (done by MWerks i believe). But there is an explanation, this dyno was not a dynojet. it was a dyno that measure hp without the wheels.

So, are there any dynojet dynos of the 135i stock? If the calculator is accurate, they will be in the 250 to 260 hp range. I hope its wrong.

Same engine, same HP!

The 135i is 200+ lbs lighter than the 335i coupe. Acceleration wise, the 135i should be slighter faster than the 3 series in all categories of acceleration. Performance wise, the 135i will outhandle and outbrake and pretty much best the 3 series aswell.

Which is why BMW made this car!
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      03-29-2008, 02:04 PM   #6
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Quote:
Originally Posted by chriskurn View Post
If you read my original post, you'd see that I said MWerks dynod it at 279hp but i don't think that's a dynojet. That's the hp at the wheel hub without the wheels on. No need to tell me to search.
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      03-29-2008, 02:08 PM   #7
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Quote:
Originally Posted by Tom K. View Post
Seems like the weights are a bit skewed as BMW specs the (manual) 335i sedan at 3594 lbs. and the 135i coupe at 3373 - a 221 lb. difference, not the 295 lbs. you quoted. Also, the sedan has a Cd of 0.30 vs. the coupe's 0.33.

Tom
The weights i used were the "test weights" quoted by road and track. I think it means the car + the driver. And I used their quarter mile numbers. So for the purpose of estimating hp from those numbers, it doesn't matter what BMW specs.

you may have a point with the Cd (Cd is not the amount of drag btw, its just the drag coefficient, there's a thread on this around here), but I'd still like to see a real dynojet dyno.
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      03-29-2008, 02:10 PM   #8
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Quote:
Originally Posted by natedog_1959 View Post
I wouldn't worry about it. The 135i blows the 335i away as the speed increases above 80 mph. Both cars are have similar HP but are traction limited at lower speeds. The weight, aerodynamics and power of the 135i shine through at higher speeds. Nate
Yea i try not to drive that fast anymore. I just want to feel the acceleration up to 80 and not above. Also, if you've ever had a fast car, you know that cars accelerate harder at lower speeds. So that feeling of being pinned in your seat is much more pronounced at lower speeds. Being faster above 80 is good for racing. I'm not going to race. I just want to get the feeling, which is much more pronounced at lower speeds.

In any case, I'm curious about the HP.
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      03-29-2008, 02:58 PM   #9
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Quote:
Originally Posted by mistermojorizin View Post
The weights i used were the "test weights" quoted by road and track. I think it means the car + the driver. And I used their quarter mile numbers. So for the purpose of estimating hp from those numbers, it doesn't matter what BMW specs.

you may have a point with the Cd (Cd is not the amount of drag btw, its just the drag coefficient, there's a thread on this around here), but I'd still like to see a real dynojet dyno.
Years ago, R&T always added 165 lbs. to the curb weight for their tester - but it seems as if the driver for the 335i was unusually portly (about 210 lbs. vs. 150 lbs. for the 135i driver)! As I can't immediately find that issue, is their curb weight for the 335i close to BMW's quoted 3594 lbs.?

While I brought up the Cd, I wonder how much it actually affects the 1/4 time. (I assume the coupe's frontal area is similar to the E90 sedan.)
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      03-29-2008, 09:32 PM   #10
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not a dynojet but I have on a Mustang Dyno.

http://www.1addicts.com/forums/showthread.php?t=6284
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      03-29-2008, 11:37 PM   #11
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Quote:
Originally Posted by FreeBMW View Post
not a dynojet but I have on a Mustang Dyno.

http://www.1addicts.com/forums/showthread.php?t=6284
Wow, those are HIGH numbers from the Mustang! Using a 12% correction (generally agreed upon conservative figure), that's 295rwhp on a dynojet.

That's a good 15-20rwhp stronger than your average 335i. Don't post that on E90post though! You're likely to get your head torn off for suggesting that the 135i isn't detuned compared to the 335i!
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      03-30-2008, 03:00 AM   #12
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Quote:
Originally Posted by FreeBMW View Post
not a dynojet but I have on a Mustang Dyno.

http://www.1addicts.com/forums/showthread.php?t=6284

thanks. 262hp sounds about right. That's close to what I predicted in the original post.
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      03-30-2008, 03:43 AM   #13
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Quote:
Originally Posted by mistermojorizin View Post
thanks. 262hp sounds about right. That's close to what I predicted in the original post.
That's on a mustang. Equivalent to about 300rwhp on a dynojey. Actually, it's more power than I've seen a 335i make on a mustang. ~260 whp on a Mustang is equivalent to ~340 hp at the crank.
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      03-30-2008, 01:06 PM   #14
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the guy who posted the mustang dyno said "they tend to read 10-20% lower then most other dynos (Dynapack, DynoDynamic,ect)" Dynapack and DynoDynamic read higher than Dynojets. Also, his statement was about mustang dynos in general after "reading up" on them, not about the specific dyno he used and the specific correction factors used by the dyno operator.

The thing about mustang dynos is that they are very sensitive to the correction factors the operator puts into them. I've seen mustang dynos that will read higher than dynojets because of the correction factors. the truth is, unless we see what that same mustang dyno reads for 335's we don't really know what that 262 number means. But, it's possible the operator entered correction numbers to get numbers comparable to a Dynojet.
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      03-31-2008, 12:14 PM   #15
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      03-31-2008, 12:31 PM   #16
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Quote:
Originally Posted by mistermojorizin View Post
the guy who posted the mustang dyno said "they tend to read 10-20% lower then most other dynos (Dynapack, DynoDynamic,ect)" Dynapack and DynoDynamic read higher than Dynojets. Also, his statement was about mustang dynos in general after "reading up" on them, not about the specific dyno he used and the specific correction factors used by the dyno operator.

The thing about mustang dynos is that they are very sensitive to the correction factors the operator puts into them. I've seen mustang dynos that will read higher than dynojets because of the correction factors. the truth is, unless we see what that same mustang dyno reads for 335's we don't really know what that 262 number means. But, it's possible the operator entered correction numbers to get numbers comparable to a Dynojet.
Dynodynamics actually generally read lower than a mustang dyno by 2-5%, sometimes more.

Also, in my experience, I've found mustangs to be the least variable of the dynos I've used. Tends to be quite consistant. My figure of 12% dif from Mustang to Dynojet is one that is widely used in the world of american muscle.

Assuming it's reading the SAME as a dynojet, that's still well within the normal range for an N54 car. 260-280 seems to be the 'normal' dynojet range.

Out of curiosity, how did you arrive at those numbers? By my calculations, from C&D's data panels, I get

135i: 13.3@106/3420=318
335i:13.6@105/3557=321

Calculating based on trap speed. If I use ET, I get

335i: 279
135i: 287

Basically identical.
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      03-31-2008, 12:37 PM   #17
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So I guess the short answer is no, nobody has put one on a Dynojet yet. Most people are probably still in the break in phase and dont want to whomp on it yet.
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      03-31-2008, 12:47 PM   #18
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Quote:
Originally Posted by Brandon26pdx View Post
So I guess the short answer is no, nobody has put one on a Dynojet yet. Most people are probably still in the break in phase and dont want to whomp on it yet.

Once I am out of the break in period . .I'll be getting on a dynojet here ... I'm sure by then though others will have done this .. lol ..

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      03-31-2008, 12:49 PM   #19
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Quote:
Originally Posted by mistermojorizin View Post
If you read my original post, you'd see that I said MWerks dynod it at 279hp but i don't think that's a dynojet. That's the hp at the wheel hub without the wheels on. No need to tell me to search.
I wasn't sure if you we're using the Dynjet brand Dyno as a generic term or not. Many people refer to a dyno as a dynojet.
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      05-23-2008, 05:34 PM   #20
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Quote:
Originally Posted by ChrisK View Post
I wasn't sure if you we're using the Dynjet brand Dyno as a generic term or not. Many people refer to a dyno as a dynojet.
Dynojet produces the most consistent dyno results from run to run, although not always the most accurate. I only look for dynojet results to compare. Otherwise, there can be large variations from other dyno systems.
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      06-21-2008, 01:54 PM   #21
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My car weighs 3360 with a full tank of gas and on a dynojet I pulled 263rwhp. Car only had 1100 miles on it at the time and only a 1/4 tank of gas.

I should be getting more runs in this week, but I dont know if they will be stock set up runs.
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      06-21-2008, 04:18 PM   #22
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Quote:
Originally Posted by Papethova View Post
My car weighs 3360 with a full tank of gas and on a dynojet I pulled 263rwhp. Car only had 1100 miles on it at the time and only a 1/4 tank of gas.

I should be getting more runs in this week, but I dont know if they will be stock set up runs.
thanks. i started this thread before i bought my 135. interesting to see it now.

did you do your dyno in 4th gear? and was the correction factor set to STD and smoothing to 5?

there's a post on n54tech about how the 335 guys dyno, so that we can compare numbers: http://www.n54tech.com/forums/showthread.php?t=488

they don't do everything for "accurate" numbers, but if you don't do it like that, you're numbers won't be comparable.

263hp is kinda around what i expected (see my first post). unfortunately 335's put down like 275.
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