N54Tech.com - International Turbo Racing Discussion
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ftl135i ftl135i is offline
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Default Single turbo or twin turbo?? And why ? - 07-18-2017, 11:12 AM

Hello ,

I want to go to next step with upgrading the turbo .
But I don't know single turbo (doc race) or twin turbo ( mmp)
My car 135i fbo manual.
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Torgus Torgus is offline
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Default 07-18-2017, 11:26 AM

what are your power goals and what fuel do you have available? Auto Manual?


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ftl135i ftl135i is offline
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Default 07-18-2017, 11:34 AM

Power 650 ++ . Manual . Fuel 98 oct and VP 109
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Torgus Torgus is offline
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Default 07-18-2017, 12:12 PM

My vote would be the doc race kit then.


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Venom77 Venom77 is offline
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Default 07-18-2017, 04:06 PM

I always vote Single turbo. Its more reliable and nicer to the engine/trans.


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08_335i 08_335i is offline
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Default 07-19-2017, 01:28 PM

Anything over 500 I prefer ST. I run around at 500whp on my ST on pump and enjoy it 150% more then the twin setup. And its 150X more reliable.
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SamJ SamJ is offline
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Default 07-19-2017, 10:03 PM

Quote:
Originally Posted by Venom77
I always vote Single turbo. Its more reliable and nicer to the engine/trans.
do you say this because the TT set up is more punchy down low and that torque is too much for engine/trans?
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Venom77 Venom77 is offline
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Default 07-20-2017, 12:40 AM

Quote:
Originally Posted by SamJ
do you say this because the TT set up is more punchy down low and that torque is too much for engine/trans?
Too much torque down low is bad for both engine and trans but that can be tuned out. My concern is the extra back-pressure you get from twins.


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SamJ SamJ is offline
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Default 07-20-2017, 06:24 AM

Quote:
Originally Posted by Venom77
Too much torque down low is bad for both engine and trans but that can be tuned out. My concern is the extra back-pressure you get from twins.
interesting, hadnt heard or thought of that

though I have read a few say back pressure can be a killer on these motors
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08_335i 08_335i is offline
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Default 07-20-2017, 01:01 PM

Quote:
Originally Posted by SamJ
interesting, hadnt heard or thought of that

though I have read a few say back pressure can be a killer on these motors
Back pressure is killer on anything forced induction.
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deltalima0 deltalima0 is offline
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Default 07-20-2017, 02:04 PM

Quote:
Originally Posted by Venom77
Too much torque down low is bad for both engine and trans but that can be tuned out. My concern is the extra back-pressure you get from twins.
I think back pressure is a made up reason for your multiple hybrid turbo failures. I have had both setups save your money do it right once and go single.


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Payam @ BMS Payam @ BMS is offline
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Default 07-20-2017, 03:01 PM

Quote:
Originally Posted by deltalima0
I think back pressure is a made up reason for your multiple hybrid turbo failures. I have had both setups save your money do it right once and go single.
I still remember the phone call like 3 years ago when you wanted the single. I think it was really expensive in the end to ship it here and back was the reason why you went with hybrids.


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deltalima0 deltalima0 is offline
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Default 07-20-2017, 03:35 PM

Quote:
Originally Posted by Payam @ BMS
I still remember the phone call like 3 years ago when you wanted the single. I think it was really expensive in the end to ship it here and back was the reason why you went with hybrids.
Yep singles back when you and I were originally talking were high now the price difference imo is a drop in the bucket considering what you get for the difference.

Singles are as easy if not easier to install. Singles do require extra thought and some time when you are OCD and worry about heat management but again easy fixes with thought and taking time during install and even after for areas you may not have considered.


2011 335is DCT
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socaln54 socaln54 is offline
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Default 01-30-2018, 01:23 PM

reviving this thread, seems that singles is the better choice, what do people think now, it only as been a few months
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suspenceful suspenceful is offline
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Default 01-30-2018, 02:09 PM

Funny, I did a video on this exact subject. With proof of both.

https://www.youtube.com/watch?v=2XJfkXMBlJA


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socaln54 socaln54 is offline
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Default 01-30-2018, 06:52 PM

Quote:
Originally Posted by suspenceful
Funny, I did a video on this exact subject. With proof of both.

https://www.youtube.com/watch?v=2XJfkXMBlJA

nice video man, where are you guys located if you don't mind me asking?
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Default 01-31-2018, 06:43 AM

Quote:
Originally Posted by socaln54
nice video man, where are you guys located if you don't mind me asking?
"You guys"... lol, it's just me in my garage. I'm up in Wisconsin.


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