boostn...I apologize...i was totally looking at the wrong sheet. someone hit me upside the head please.

I retract my last statements and will now wear the dunce hat.




j

 

I try to make that site as accurate as possible... It's never going to be 100% because it uses GNUPlot to make the graphs from datapoints in a database... so it tries to find an equation for a line that fits the points and it can be off by a little sometimes....

But....

Speaking of the SPOAutos graph, I think it's pretty close... if you think the lower RPM numbers are off, you may want to read the Y axis on his original dyno again. The left side is torque and goes from 50-450. The right side is HP and goes from 0-450. Many people have gotten tripped up by that.

As for your dyno (attached) it was a dark image and kinda small and hard to read.. so getting the best datapoints wasn't that easy. I do agree that the dyno page makes your peak HP look like it's around 6000 when it's really more like 6400...

Sorry bout that.. maybe I'll fix it tomorrow by massaging the datapoints a bit

Anyhow, other than me possibly fat fingering entering a datapoint which I usually catch when I look at the graph... I think it's pretty accurate... Accurate enough to make some generalizations and broad comparisons anyhow...

Take a look at the SPO one again, I think it's pretty good...

Regards,
Brian

 

Damn this thing isn't doing attachments... I guess you won't get to see his real dyno.



Brian

 

I think these pretty much show how I feel. Sorry guys, I'm a knuckle head. CJ

BTW: Thanks Brian for setting me straight!

 

You can't look only at peak numbers. At any given RPM, it doesn't matter whether you look at power or torque, since they're proportional to each other. HP = Torque * RPM / 5252. However power is a more meaningful number, since it includes a time factor (RPM). Since acceleration is an issue of time, torque isn't meaningful without more info. Run engine output through all the gears, and you can derive Thrust (in lbf) = HP * 375 / MPH.

 

ok..im confused....could someone please clear this up?

I was wondering how my car shows more torque down low and less hp than the bnr graph if the equation above is true?

when i plug the numbers from my dyno graph into the above equation it matches my dynosheet exactly.

on the bnr set for example i plug in the numbers...of torque x rpm / 5250 and the numbers do not match. at 3000 rpms when i plug that equation in i get 97.14 hp if i multiply the torque times rpm(3000) and divide. am i doing something wrong?

math...i tell ya.




j

 

Jason,
97 hp is about right at 3k for the BNRs

 

why does the sheet show differently? am i looking at something wrong again?

j

 

Because you're reading the sheet wrong
Look at BOTH of the y axes, it is very deceiving. I made the same mistake myself.

 

ok...im officially retarded...how come when i draw the line up from 3k on my sheets it says the right number but when i do that on the bnr sheet it says something different....im trying to figure out how i am reading this wrong. it looks to me like 97hp happens at 2400 rpms on the sheet im looking at...the one on page 1.


j

 

Ok, on the left of the BNR sheet, Torque starts at 50. Now look on the far right -HP starts at 0. So at 3k rpm he has about 165 ft-lbs of torque which gives about 95 hp mathematically. No follow the hp line at 3k rpm to the right of his dyno sheet.

 

hahahahahh!!!

omg...well i feel better now...cuz ive been reading those numbers from the left side only.

ok..new rule...no more looking at dyno sheets when Im sleepy or waking up.

haha

thanks marshall.


j

 

Torque plot shows more boost possible on primary. Any plans to crank primary up to 17-18 psi, to really enjoy that sequential set-up. Transition appers low enough to pull it off.

Nice work

 

at this point i am not able to boost past fifteen lbs on the primary. any thoughts on this?


thoughts?

 

Prespool may be taxing available exhaust energy to the point where theres nothing more to give to the primary turbo past 15psi.

 

Artguy: No biggie !!!

 

what are PFC boost and duty cycle settings for primary and twin modes? may need datalogic to check

 

You guys crack me up lol

If you keep at it your going to make me feel like I need to tune my car some more haha

I'm running 14 degrees of split timing which is real conservative. I really should pull that down to about 10. Down in my lower rpms where I should be running fairly lean I'm running about 2 full a/f points rich. Pulling that fuel will increase spool and power tremendously on the bottom end and adj the split will make quite a difference as well. The only problem is my car is running so good and it was down for so long I'm scared to mess with it any more.

Also, on the dyno I was heat soaking some. I traped 125mph on the track which reflects around 430-435.

STEPHEN

 

>You guys crack me up lol

If you keep at it your going to make me feel like I need to tune my car some more haha<

Hehehe....watch out !!! the little twins are blowing into a ported motor now

...just goofing off.

 

well when are you going to see what those twins do boostn? btw..it aint your twins...i dont know what it is...your car is a freak of nature.

spo..so whens the new tuning session start?


j

 

Hell if I know, after my car being down for 6 months last time I'm reluctant to mess with it. Its running so good and its coming into summer...it would kill me for my car to be down and costing me an *** load of money over the summer.

We'll see I might play with the timing some or something, I dont know

Maybe I'll just wait for someone to beat my numbers then I'll play with it haha

JohnD, if you start to trap 125 or more just let off cause I'm not ready to play with my tuning yet lol j/k

STEPHEN

 

You guys are a load of information. I'm trying to learn from you all so please keep up the great work!

 

I want to upgrade my turboes soon. i am torn on what to do...here is where i am at and my thinking:

stock twins....i dont think its a freak...people who have upped the boost to the 17 and 18 range on the stock twins have reported damn low ET's, 120 plus traps and very high 300s rwhp. It also seems to me that these people also know a crap load about tuning. I think its pretty obvious that there is a correlation there.

Now, about the BNR's or any upgraded twins for that matter. Most of the people running the BNR;s that have reported good numbers (similar numbers to the stock twins i might add at similar boost levels) have had the oppurtunity to have exposure to a great tuner...Steve Kan and have a "nice" port job done.

Further more...the bnr's are only showing a slight power potential advantage to the stock twins. People who are making high 300s rwhp or even low 400s are running big boost with BOTH the stockers and modified twins. In addition both forms are reporting nice healthy turbos. Several people run around this forum and worship these upgraded twins. I dont see why. Perhaps i need to experience them myself. But then i would also need to experience boostn7's car too. I would love to hear boostn7's opinion of upgrading the twins or just going single.

I am leaning GT35/40 right now....way more power potential with maintaining quick spool up...the downside...well its alot of money and i may need to change my fuel setup if i want big numbers.

 

matty...i will say it again...i ran high boost on my stock twins....after they started shitting oil all over my driveway I had the wonderful opportunity to open them up and see the damage....I wont ever run those shaft bearing hitachis again. period...nor would I suggest running them past 15psi when they start producing huge amounts of heat. you can say they dont produce heat...but I would say...go ahead and run them...when they break pull em apart and see what you did. Ive done that.

so when you pull down 400 rwhp on stock twins I will listen to you. otherwise just keep wrenching my friend cuz there have only been two guys in the history of the forums that came close to or broke 400rwhp on stock twins....anthony and boostn....no one else is coming close....many people experience turbo failure running high boost with the stockers...im not the only one there


my m2 twins run 25 degrees cooler and throttle response has increased enough to make me smile.

its math...the larger wheels and more efficient bearing assemblies allow for a higher efficiency range tolerance...the little hitachis will cook and cook and cook at high boost. you will get your power out of them Im sure...but for how long.

I stick to my guns....boostns car is amazing...tuning or not...


cheers


jason

 

fair enough...i put down 340 @14psi...rich i am sure, definately breaking up top, and letting off at 6800rpms. Stock engine and turbos. Thats about avg..wouldnt you agree?
Logic dictates that i can make more power though. I would love to see the upgraded twins at 14psi under simular tuning as i have. Would they make more power? i dont know.
Or am i simply missing the boat..that the point of upgrading is to run higher boost?