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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Some recent JB4 ISO Dyno Numbers!!



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      04-09-2013, 11:23 AM   #23
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      04-09-2013, 11:33 AM   #24
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Bump for the awkward torque curve.... whats going on here?
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      04-09-2013, 11:37 AM   #25
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Quote:
Originally Posted by CombatNinja View Post
Something is weird with that graph. Power and torque have to be equal at 5250 rpm. That is, the lines for both should intersect at that rpm but this shows it much earlier. This is not possible.
Ha, no comment on this? A dyno usually measures TQ and then calcs hp or vice versa. With that cross at the wrong point, tell me that this graph is not reliable.
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      04-09-2013, 11:52 AM   #26
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Originally Posted by mithiral67 View Post
Ha, no comment on this? A dyno usually measures TQ and then calcs hp or vice versa. With that cross at the wrong point, tell me that this graph is not reliable.
They do... at 5250 they're both at about 380. The scale is different for torque (Right Y-axis) as it is for HP (Left Y-axis). So the lines cross at a different point but they're really both at around 380 at 5250. Nothing wrong with it.
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      04-09-2013, 11:53 AM   #27
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Why is your dyno graph all messed up? HP and torque are equal at the wrong rpm.
Scales aren't equal. It's right.
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      04-09-2013, 12:33 PM   #28
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well i will be a monkey's uncle. I am wrong again.
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      04-09-2013, 01:03 PM   #29
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well i will be a monkey's uncle. I am wrong again.
Blargh. Same here. and I thought I was smart....


To be fair the n55's graphs look WAY different from the n54's graphs
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      04-09-2013, 03:45 PM   #30
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Never scrolled over far enough to see that the scales are different. So, am I the bigger retard because I failed to look at the graph carefully or is the person who set up the graph the bigger retard?

Seriously, who the fvck would plot the numbers like that?
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      04-09-2013, 05:01 PM   #31
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Originally Posted by CombatNinja View Post
Never scrolled over far enough to see that the scales are different. So, am I the bigger retard because I failed to look at the graph carefully or is the person who set up the graph the bigger retard?

Seriously, who the fvck would plot the numbers like that?
I'm guessing the software auto-scales so you can get the biggest curve for each graph to help show the curve gradients. I mean if you take the extreme and your car made 2,000ft-lbs of torque but could only rev to 1k rpm, the car would peak at 380HP. Trying to read the differences in the curve on the HP when its scale is 0 to 2500 would be insane as the entire thing would likely fall within 2 ticks on the scale. Granted this is a crazy exaggeration, but you get the idea.
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      04-09-2013, 05:50 PM   #32
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Yea, hitting 500 tq and only 400whp shows how fast the twin scrolls run out of wind up top.
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      04-09-2013, 06:50 PM   #33
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Yea, hitting 500 tq and only 400whp shows how fast the twin scrolls run out of wind up top.
Unfortunately... though the development is underway for turbo upgrades which we sorely need!
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      04-09-2013, 07:59 PM   #34
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Unfortunately... though the development is underway for turbo upgrades which we sorely need!
Hence why many have started to wonder if vargas will get to the 500-525 whp goal... i would like it to be on 91 pump... for right now let the waiting begin... although I am reminded on how we all had to wait for the JB4 S2, Cobb, etc... waiting is hard
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      04-09-2013, 08:28 PM   #35
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Hence why many have started to wonder if vargas will get to the 500-525 whp goal... i would like it to be on 91 pump... for right now let the waiting begin... although I am reminded on how we all had to wait for the JB4 S2, Cobb, etc... waiting is hard
I feel ya. The worst part is knowing that the wait isn't just for the hardware, but the inevitable tuning nightmare that will follow. That valvetronic isn't going to be easy to figure out and dial in properly...
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      04-11-2013, 01:22 PM   #36
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Hence why many have started to wonder if vargas will get to the 500-525 whp goal... i would like it to be on 91 pump... for right now let the waiting begin... although I am reminded on how we all had to wait for the JB4 S2, Cobb, etc... waiting is hard
Not downing Vargas, as I think it's great he's done what he has to date, but I have my doubts about the OEM N55 exhaust housing being able to do 500+whp on pump. On meth or race gas, probably yes. It has a micro-sized A/R ratio by the look of it, never held one in my hands though.

I'm certainly hopeful and cheering for whomever puts the resources into the N55 upgrade. I'm wondering if it'll be an easier swap than N54 twins. If so, it may be a very popular upgrade.
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      04-11-2013, 01:38 PM   #37
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n55 is a very up and coming motor. I read that they have already put more n55's into any model than they have with the n54. This being said the market for these will EXPLODE in the coming years. I've also read the valves are bigger and they flow a lot easier, I'm anxious to see the differences between the two as the tuning and upgrades start to get serious with the n55.
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      04-11-2013, 01:53 PM   #38
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n55 is a very up and coming motor. I read that they have already put more n55's into any model than they have with the n54. This being said the market for these will EXPLODE in the coming years. I've also read the valves are bigger and they flow a lot easier, I'm anxious to see the differences between the two as the tuning and upgrades start to get serious with the n55.
All true. The cam has a larger/wider profile base than the N54 does too. What the translates into with Valvetronic is anyone's guess though.

I agree that it's got to be a popular engine and will have good aftermarket following in the next year or two as they all come off lease and hit the used car market. That and the warranty start to come up on a lot of them.

I also hope their injectors/coils/cam ledges and all the crap that keeps breaking on the N54s turn out to be a little more reliable.
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