[Mike.]

Originally Posted by David0ff

so exhaust mode crippled you
were you tuned for exhaust?

thx

he mixed up the colors, blue is everything

[jc5988]

Originally Posted by David0ff

so exhaust mode crippled you
were you tuned for exhaust?

thx

Originally Posted by Emozoo

he mixed up the colors, blue is everything

i think i need hav my vision rechecked.

[David0ff]

Originally Posted by jc5988

i think i need hav my vision rechecked.

hahaha ok thx

i was really surprised and sad at the same time lol

[andrey_gta]

Originally Posted by TheAxiom

Absolutely impressive - Record for an N51 I believe. Would really put this over the top, thanks for sharing!

Looking at his Base dyno, it's also very high. Most stock dynos hover at 200 whp.

Anyway this dyno shows the gains well for n51. i wonder why the n52 doesn't react as dramatically to similar mods

[ammar23]

Originally Posted by GTKrockeTT

Username: GTKrockeTT
Car/Engine: 328i/N52B30
Transmission: Manual
Mods: Mapleridge Headers, 3 stage manifold and AA tune
Dyno type: Dynojet
Peak numbers: 242whp/215wtq
Graph:

Holy Jesus

[TheSt|G]

Originally Posted by TheAxiom

Username: TheSt|G
Car/Engine: 128i/N52B30
Transmission: Manual
Mods: Evolve tune, Eurobox, BMW Euro Performance intake, Super Sprint headers
Dyno type:Dynojet
Peak Numbers:235whp/219wtq
Graph:

Should have the 3 stage in there as well.

[Taskmaster]

Ahh, fixed!

[TheSt|G]

Also should probably note that it pulled timing now that I think about it. Shrug.

[MarkkyyMan]

Originally Posted by TheSt|G

Also should probably note that it pulled timing now that I think about it. Shrug.

Realistically from a dyno perspective it shouldn't make that much of a difference, dynojets already provide fluffed numbers to begin with.

[TheSt|G]

Originally Posted by MarkkyyMan

Realistically from a dyno perspective it shouldn't make that much of a difference, dynojets already provide fluffed numbers to begin with.

Seeing as most people(pointlessly) care about peak power, it makes a difference.

I certainly agree dynos are worthless though. I've been saying that for years on here/elsewhere.

[Taskmaster]

You won't see me agreeing with that.

[MarkkyyMan]

Originally Posted by TheSt|G

Seeing as most people(pointlessly) care about peak power, it makes a difference.

I certainly agree dynos are worthless though. I've been saying that for years on here/elsewhere.

So the fluffed numbers will be even more fluffy.

[TheSt|G]

Originally Posted by MarkkyyMan

So the fluffed numbers will be even more fluffy.

Not sure what you are trying to get to here, almost every dyno in this thread is Dynojet. Unless you think I should be held to some special standard?

[MarkkyyMan]

Originally Posted by TheSt|G

Not sure what you are trying to get to here, almost every dyno in this thread is Dynojet. Unless you think I should be held to some special standard?

Your worrying about it pulling timing, haven't heard anyone else say that(other than your brother), and trying to obtain peak hp/tq numbers on a dyno that is known to produce 10-12% higher horsepower numbers than engines actually make.

That is all I'm saying here. I hold no one to a "special standard".

[TheSt|G]

Originally Posted by MarkkyyMan

Your worrying about it pulling timing, haven't heard anyone else say that(other than your brother), and trying to obtain peak hp/tq numbers on a dyno that is known to produce 10-12% higher horsepower numbers than engines actually make.

That is all I'm saying here. I hold no one to a "special standard".

I'm not worrying about it pulling timing, I saw it do so. It's a simple statement of fact.

This is why I hate dynos. We are estimating drivetrain loss, dyno loss from one to another, ambient conditions, and the variance of an engine from pull to pull. The science is awful.

[justpete]

Originally Posted by TheSt|G

I'm not worrying about it pulling timing, I saw it do so. It's a simple statement of fact.

This is why I hate dynos. We are estimating drivetrain loss, dyno loss from one to another, ambient conditions, and the variance of an engine from pull to pull. The science is awful.

^^^This

They're only really good for looking for differences over the very short term, as in the same tie-down and conditions. Keeping the engine and drivetrain at the same state is nearly impossible so run to run variance is impossible to null out. It is possible to let the car cool and see if the difference remains but we're talking all day tuning on the dyno looking for repeatable, persistent improvements. And without AFR/Lambda plotted along with the torque it's pretty much a crapshoot.

They're not very useful in comparisons across different dynos, even of the same make, or different tie-downs, or different days, or even start to finish. But they're really handy tuning tools, in the right hands. It's track performance that turns a graph into a fact imho. And it's a relatively small percentage of that fact, too. Grains of salt should ship with every dyno plot.

[TheSt|G]

Originally Posted by justpete

^^^This

They're only really good for looking for differences over the very short term, as in the same tie-down and conditions. Keeping the engine and drivetrain at the same state is nearly impossible so run to run variance is impossible to null out. It is possible to let the car cool and see if the difference remains but we're talking all day tuning on the dyno looking for repeatable, persistent improvements. And without AFR/Lambda plotted along with the torque it's pretty much a crapshoot.

They're not very useful in comparisons across different dynos, even of the same make, or different tie-downs, or different days, or even start to finish. But they're really handy tuning tools, in the right hands. It's track performance that turns a graph into a fact imho. And it's a relatively small percentage of that fact, too. Grains of salt should ship with every dyno plot.

Precisely.

And on a good topic, your build is kickass. I wish you were local as I'd both love to see it/lift inspect it/do some pulls for science.

[justpete]

Originally Posted by TheSt|G

Precisely.

Sadly so. It's possible to sorta correlate one type of dyno with another but only generally at best. The actual accuracy of any given dyno can be all over the place with torque input so going by peak numbers doesn't always help in any attempt to correlate readings. OTOH, it's fun and keeps everybody thinking and working to up their game and that's good anyway.

Originally Posted by TheSt|G

And on a good topic, your build is kickass. I wish you were local as I'd both love to see it/lift inspect it/do some pulls for science.

Nice of you to say, thanks! Dang but that clutch is a bitch to get off the line though. Only stalled it once today so getting better.

Using BMWLogger for AFR we'll be putting it back on the dyno for race tuning in the near future along with pulls running Sunoco 260 GT for the heck of it since they have a fresh drum of it at the shop for a reasonable price per gallon. I'm guessing it won't make much difference without at the very least bumping compression ratio.

I'll post the dyno and AFR curves, it'll be interesting to see what the baseline comes up at and how it changes after a number of pulls to heat up the headers. That'll be interesting anyway. If they get the PT-CAN connection corrected I can grab accelerometer data from the DL1 and its built-in torque/power calculation based on car weight for real world comparison including rpm, etc. Don't need the CAN for just the horsepower calculations though, just GPS, accelerometer, gear ratios, and rolling radius. The latter are already in the system for a long time now but the weight can now be tweaked a bit to be more accurate, a relative term.

We know the car weight exactly now since it had to be scaled and corner balanced. It's 3369 lbs with a full tank which _I think_ translates to 3264lbs unladen, more or less. That's based on a sp.g. of 0.77 and 17gal full. Plenty of error in those calculations... I can capture atmospheric conditions with a Kestrel 4500 for input to the program but I haven't run a coastdown yet so rolling resistance is unknown although Cd*A is known, more or less. Not that any of this matters really but it's fun. There's that concept again.

[TheSt|G]

Originally Posted by justpete

Nice of you to say, thanks! Dang but that clutch is a bitch to get off the line though. Only stalled it once today so getting better.

Using BMWLogger for AFR we'll be putting it back on the dyno for race tuning in the near future along with pulls running Sunoco 260 GT for the heck of it since they have a fresh drum of it at the shop for a reasonable price per gallon. I'm guessing it won't make much difference without at the very least bumping compression ratio.

I'll post the dyno and AFR curves, it'll be interesting to see what the baseline comes up at and how it changes after a number of pulls to heat up the headers. That'll be interesting anyway. If they get the PT-CAN connection corrected I can grab accelerometer data from the DL1 and its built-in torque/power calculation based on car weight for real world comparison including rpm, etc. Don't need the CAN for just the horsepower calculations though, just GPS, accelerometer, gear ratios, and rolling radius. The latter are already in the system for a long time now but the weight can now be tweaked a bit to be more accurate, a relative term.

We know the car weight exactly now since it had to be scaled and corner balanced. It's 3369 lbs with a full tank which _I think_ translates to 3264lbs unladen, more or less. That's based on a sp.g. of 0.77 and 17gal full. Plenty of error in those calculations... I can capture atmospheric conditions with a Kestrel 4500 for input to the program but I haven't run a coastdown yet so rolling resistance is unknown although Cd*A is known, more or less. Not that any of this matters really but it's fun. There's that concept again.

I had a more aggressive clutch and lightweight flywheel on my E36 M3 for a few years. It was fun, but in the end I didn't really want another. Stock N52 is a pretty responsive street flywheel, especially compared to its rather lazy predecessor in the M54.

I love the total car approach, and it is certainly something I'm doing myself. It's simply ridiculous how much unsprung weight(~40lbs) I was able to toss from the stock wheel/tire setup alone. These days I'm somewhere around ~3000lbs based on the weigh in of others with similar factory options. I'm going to try to remember to hit a highway weigh station this weekend to get an exact figure. I guess that is one of the few benefits of this small coupe design, but I'd much have the hatch that is even lighter still.

[Taskmaster]

Get a room you two

[justpete]

Originally Posted by TheAxiom

Get a room you two

You're not at all well. That's why we like you...

[Taskmaster]

Originally Posted by justpete

You're not at all well. That's why we like you...

Not at all.