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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > **627WHP@22.5psi** Vishnu/FFTEC Single Turbo System Dyno Session #3 (PROcede Tuned)



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      02-22-2012, 10:37 AM   #67
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Originally Posted by vasillalov View Post
Credit is due where credit is due: Very nicely done! Congrats!


Question: why is it that the torque remains constant? I mean, it is good that there is no torque drop-off, but there is no torque increase either.
There is a slight upward slope from 5500RPM and up. The efficiency of the engine is not geared toward high RPMs, so the breathing is not conducive to upward sloping torque curves. The boost level climbs to compensate, and it looks like there is indeed a slight increase in torque. This would be easier to accomplish with different cams, too.
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      02-22-2012, 10:39 AM   #68
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Isn't 1 bar approx. 14.5psi?

If so (2.5 * 14.5) - 14.5 = 21.75psi?

I can't wait to test out the 6AT tranny ... BTW, i'm going 1 size smaller on the turbo, just so i can mate up the power curve where the engine likes to cruise at (around 2500-2700 rpm).
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      02-22-2012, 10:40 AM   #69
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Nice work Shiv, very impressive results
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      02-22-2012, 10:44 AM   #70
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Wow very impressive!

I assume this is a stock transmission? I am sure this has been asked before, but what are the factory rated torque/hp limits of the N54 transmission?
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      02-22-2012, 10:46 AM   #71
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100% transmission/drivetrain. Only mod is Spec Stg2+ clutch and light flywheel.
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      02-22-2012, 10:52 AM   #72
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Oh no he didn't!!!!

Good job Shiv I am prude of you!
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      02-22-2012, 10:55 AM   #73
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Impressive result, well done Vishnu
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      02-22-2012, 11:02 AM   #74
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Utterly speechless right now. I can't say I don't regret buying an N54 now. Kicking myself...
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      02-22-2012, 11:04 AM   #75
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Originally Posted by dzenno View Post
Weird...timing this 60-130 looks to be in the 7s? Where's that extra power going? You should be well into the 6s...7s are RB territory...that's weird...vbox it!
+1...V box it.
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      02-22-2012, 11:07 AM   #76
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Quote:
Originally Posted by cupertinosteve View Post
Isn't 1 bar approx. 14.5psi?

If so (2.5 * 14.5) - 14.5 = 21.75psi?

I can't wait to test out the 6AT tranny ... BTW, i'm going 1 size smaller on the turbo, just so i can mate up the power curve where the engine likes to cruise at (around 2500-2700 rpm).
Right! So how is 22.5psi being done on the stock tmap sensor?
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      02-22-2012, 11:09 AM   #77
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That turbo sounds soooooo nice. These number are what everyone was hoping for guys. Keep up the GREAT work. I want to sell my girlfriend's Vespa to buy this...funny thing is she might approve!
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      02-22-2012, 11:12 AM   #78
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Amazing.
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      02-22-2012, 11:16 AM   #79
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Originally Posted by Sleeper View Post
I'd like to see a retune and the resulting graph where boost is ramped up normally, ie. as quick as possible. I understand the reasoning behind ramping it up like a NA engine (drivetrain protection), but to me, that's not the point of a big turbo. By nature, the bigger turbo should hit full spool much later than the little twins, but still come on hard enough that you get rocked into the back of your seat. That's a high WTQ/WHP big turbo experience for me... not a slow gradual increase where peak boost hits at 6500 RPM.
I believe it's stated in the other thread that he's still working out underboost DME codes from the slower spooling big turbo. I would imagine tuning in the lower third/quarter of the RPM range is delayed until they can keep the DME happy.

That being said, I remember being a big part of the MR2 Turbo scene years ago and the big measure of "spool" and how quick a turbo could make torque was the RPM where the engine would reach 200wtq. Given, that motor was 2.0L turbo, mine made 200wtq@ 2850rpm and was an absolute blast to drive.

Vishnu's car makes 200wtq@2400 and another 200wtq more in just 1000rpm. Not too shabby for not even touching/optimizing that rpm band.
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      02-22-2012, 11:18 AM   #80
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So over 120whp from pump to meth? Damn thats a difference. Crank HP at over 730hp is gross all day long.
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      02-22-2012, 11:23 AM   #81
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Originally Posted by dzenno View Post
Right! So how is 22.5psi being done on the stock tmap sensor?
Maybe the 3bar unit is already there...

Sounds pretty easy for him as he can get the 3bar value in and give the DME original "expected" values...

Quote:
Originally Posted by shiv@vishnu View Post
Yep.. there is a 3bar MAPS sensor input on the Rev3. We will also consider just swapping out the factory 2.5bar sensor for a direct replacement 3bar unit. Pretty easy stuff to do. And judging by how quickly the engine wakes up when with each additional psi of boost, I'm also looking forward to seeing what this setup does at 23-24psi. I suspect we will see 600whp. And with still another 100+hp of overhead. I can't tell you guys how much of a blast it is to drive this car. Not just in terms of power but how smoothly and effortlessly the power is delivered. It makes running upgraded twins feel and sound very "coarse" in comparison.
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      02-22-2012, 11:45 AM   #82
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I may need to pick up an '07 335i as a second car now....
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      02-22-2012, 11:49 AM   #83
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Here's a fun dyno comparison between the single turbo and a stock 2007 6MT (only DCIs). Same dyno, similar conditions:



Yes, at 6800RPM, the single turbo makes 400WHP MORE than the stock car
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      02-22-2012, 11:50 AM   #84
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Originally Posted by dzenno View Post
Right! So how is 22.5psi being done on the stock tmap sensor?
Jeeze, give him some time to answer. You've brought this up 3-4 times and Shiv only started this thread today. It would be nice to see one Vishnu related post where you don't covertly try and take a steaming dump in it, and then mask it with smiley faces and kudos.

Time will reveal all. This is very exciting news and only heightens the anticipation of the products release. That Mexico run was fun to watch!
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      02-22-2012, 11:56 AM   #85
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Utterly speechless right now. I can't say I don't regret buying an N54 now. Kicking myself...
hes throwing it on an N55 next!
well thats the plan anyway lol
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      02-22-2012, 11:56 AM   #86
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Quote:
Originally Posted by shiv@vishnu View Post
Here's a fun dyno comparison between the single turbo and a stock 2007 6MT (only DCIs). Same dyno, similar conditions:



Yes, at 6800RPM, the single turbo makes 400WHP MORE than the stock car
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      02-22-2012, 11:58 AM   #87
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hes throwing it on an N55 next!
well thats the plan anyway lol
I really hope you're not messing with my head.
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      02-22-2012, 11:58 AM   #88
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Great work! Can't wait to see race gas numbers.

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