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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 > VTT Stage 2 and BMS up the N55 WR again



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      01-06-2015, 06:09 PM   #1
Tony@vargasturbotech
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VTT Stage 2 and BMS up the N55 WR again

I sent Terry our new wastegate upgrade to test out on his shop car. This upgrade allows N55 owners to run up to 30 psi if they wish and hold much more boost to redline. The results were 487WHP and 530WTQ at 26 psi midrange tapering to about 22 psi at 6500. We are very happy with these results, and as usual give thanks, and props to Terry for testing things out for us!
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      01-06-2015, 06:20 PM   #2
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This is going to be good. Good job guys.
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      01-06-2015, 07:22 PM   #3
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Congrats Tony and BMS insane the power and how far the N55 has come. I can't wait to get my hands on a DBB stage 2 soon.
So close to 500whp maybe I'll break that mark considering my N55 Is 6MT
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      01-06-2015, 08:26 PM   #4
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Excellent numbers!
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      01-06-2015, 08:51 PM   #5
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So. aside from a CP, DP, Tune, and Air Filter upgrade, what else is needed to achieve this?
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      01-06-2015, 11:23 PM   #6
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Quote:
Originally Posted by 1cleann55 View Post
Congrats Tony and BMS insane the power and how far the N55 has come. I can't wait to get my hands on a DBB stage 2 soon.
So close to 500whp maybe I'll break that mark considering my N55 Is 6MT
Why would a 6MT put out more whp than a DCT?
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      01-06-2015, 11:45 PM   #7
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Quote:
Originally Posted by Nugget View Post
Why would a 6MT put out more whp than a DCT?
6MT don't have trouble with slip or need to be flashed ETC. 6MT tend to be the Dyno queens if a solid clutch Is installed
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      01-07-2015, 12:07 AM   #8
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But dcts are still faster.
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      01-07-2015, 12:32 AM   #9
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Congrats!
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      01-07-2015, 01:13 AM   #10
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Congrats!!
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      01-07-2015, 06:13 AM   #11
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Hi Tony,

Howcome previous testing the car made 468 whp on 20.x psi tapering to 17 psi at 6500?
http://www.n54tech.com/forums/attach...1&d=1386801760
http://www.n54tech.com/forums/attach...1&d=1386801760

And with this new wastegate it makes only 430 whp at 20 psi while previously close to 470whp at 20.x psi?

I dont understand why this is. Could you explain? Because it looks like this 5 psi extra only gives 20 whp?
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      01-07-2015, 08:50 AM   #12
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Vargas, it probably was mentioned, but what fuel is this using?

These are numbers I like to see. Plus seeing 20+ psi and as high as 26 at times wiht no knock is just awesome.
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      01-07-2015, 11:25 AM   #13
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Both the above are questions for Terry. We are not sure which fuel he was running, nor what he changed in the tune to achieve different curves. The wastegate will not effect power at all by itself, all it does is allow you to run higher boost levels than the stock unit, which will give you a higher power ceiling.
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      01-07-2015, 11:28 AM   #14
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Car is FBO with VTT stg2 turbo, catted DP and stock exhaust system.

The car was running e30 with meth.

Dark- I believe the difference is the way the WG works. Allowing more overall boost but I do see what you mean at the 20psi mark. I do not understand WG technology much but I assume this was the difference.

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JB4 w/ back end flash map
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BMS intake, OCC, etc
E30 fuel
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      01-07-2015, 11:42 AM   #15
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wish there was dyno testing with pump gas and no Meth.
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      01-07-2015, 11:44 AM   #16
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Quote:
Originally Posted by g2BMW
wish there was dyno testing with pump gas and no Meth.
Terry said the 15 psi run could be a pump gas tune.
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      01-07-2015, 11:45 AM   #17
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Quote:
Originally Posted by iuhutch
Car is FBO with VTT stg2 turbo, catted DP and stock exhaust system.

The car was running e30 with meth.

Dark- I believe the difference is the way the WG works. Allowing more overall boost but I do see what you mean at the 20psi mark. I do not understand WG technology much but I assume this was the difference.

Mods:

JB4 w/ back end flash map
Vargas Stage2 turbo w/ forge diverter valve
Vargas pressure based wastegate retrofit kit (a soon to be released product)
2.2g meth kit w/ CM14 nozzle
Catted DP w/ OEM exhaust
BMS intake, OCC, etc
E30 fuel
Well i prefer the 20 psi to 17 psi boost tapering curve. F series dont have 3.5 bar tmap support anyways.
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      01-07-2015, 11:58 AM   #18
Tony@vargasturbotech
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Quote:
Originally Posted by iuhutch View Post
Car is FBO with VTT stg2 turbo, catted DP and stock exhaust system.

The car was running e30 with meth.

Dark- I believe the difference is the way the WG works. Allowing more overall boost but I do see what you mean at the 20psi mark. I do not understand WG technology much but I assume this was the difference.

Mods:

JB4 w/ back end flash map
Vargas Stage2 turbo w/ forge diverter valve
Vargas pressure based wastegate retrofit kit (a soon to be released product)
2.2g meth kit w/ CM14 nozzle
Catted DP w/ OEM exhaust
BMS intake, OCC, etc
E30 fuel
The wastegate itself will have no effect on the boost curve, that is 100% dictated by the targets given to it by the tuner. It is just a mechanical actuator, it does what it is told to. If the these curves are different it is because they are tuned different.
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      01-07-2015, 12:25 PM   #19
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Quote:
Originally Posted by Tony@vargasturbotech View Post
The wastegate itself will have no effect on the boost curve, that is 100% dictated by the targets given to it by the tuner. It is just a mechanical actuator, it does what it is told to. If the these curves are different it is because they are tuned different.
Just to clarify for others I think you meant power curve, not boost curve. The wastegate obviously sets the boost curve so if the wastegate were an issue you would see it by the boost being off from requested values.
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      01-07-2015, 12:33 PM   #20
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Quote:
Originally Posted by JETmn View Post
Just to clarify for others I think you meant power curve, not boost curve. The wastegate obviously sets the boost curve so if the wastegate were an issue you would see it by the boost being off from requested values.
I understand what they meant as well, just clarifying that the gate will not effect the boost or power curve. If the curves are different its because a different tuning approach was used. Both the curves look solid.
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      01-07-2015, 01:22 PM   #21
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Quote:
Originally Posted by Darkhold View Post
Hi Tony,

Howcome previous testing the car made 468 whp on 20.x psi tapering to 17 psi at 6500?
http://www.n54tech.com/forums/attach...1&d=1386801760
http://www.n54tech.com/forums/attach...1&d=1386801760

And with this new wastegate it makes only 430 whp at 20 psi while previously close to 470whp at 20.x psi?

I dont understand why this is. Could you explain? Because it looks like this 5 psi extra only gives 20 whp?
Not sure if it was you that asked the same question on the other forum, but the turbo is on a different car now. The previous e90 had additional octane and exhaust mods that terry said probably accounted for the difference
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      01-07-2015, 01:26 PM   #22
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Quote:
Originally Posted by Curare86
Quote:
Originally Posted by Darkhold View Post
Hi Tony,

Howcome previous testing the car made 468 whp on 20.x psi tapering to 17 psi at 6500?
http://www.n54tech.com/forums/attach...1&d=1386801760
http://www.n54tech.com/forums/attach...1&d=1386801760

And with this new wastegate it makes only 430 whp at 20 psi while previously close to 470whp at 20.x psi?

I dont understand why this is. Could you explain? Because it looks like this 5 psi extra only gives 20 whp?
Not sure if it was you that asked the same question on the other forum, but the turbo is on a different car now. The previous e90 had additional octane and exhaust mods that terry said probably accounted for the difference
Yup i have seen it. Tnx. I guess the higher boost around 5k makes the curve more peaky.
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