Turbo setup for single rotary engine. - RX7Club.com - Mazda RX7 Forum

Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Single Turbo RX-7's
Reload this Page >

Turbo setup for single rotary engine.

Single Turbo RX-7's Questions about all aspects of single turbo setups.

Turbo setup for single rotary engine.

Reply

 
 
 
Old 03-07-18, 12:28 AM
  #1  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Turbo setup for single rotary engine.

Hello.
We are going to build single rotary engine and we need tubrocharger for it.
We need only about 120hp and low boost.
And we need engine to make power on stable rpm about 5-6k for a long time.
So we need not fast spool ets, I think we need big hot side just not to make much exhaust pressure.
Could you please help me to make a choise of turbo?
Thanks.
_Alik_ is offline  
Reply With Quote
Old 03-07-18, 04:32 AM
  #2  
Arrogant Wankeler
 
Slides's Avatar
 
Join Date: Nov 2006
Location: Newcastle NSW Australia
Posts: 300
Thanked 7 Times in 7 Posts
So basically just to maintain power with altitude?

Gt25 ish should be fine. A standard garrett turbo from an SR20 or a ct off a toyota or a factory turbo from a wrx.
Slides is offline  
Reply With Quote
Old 03-07-18, 04:34 AM
  #3  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
What do you think about borg warner s1bg with 0.81ar hot side ?
_Alik_ is offline  
Reply With Quote
Old 03-07-18, 04:38 AM
  #4  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Yes, just to have power on 5-6k
Ok, and will this turbos have enough big hot side?
I just wabt engine to breathe good.
_Alik_ is offline  
Reply With Quote
Old 03-07-18, 06:52 AM
  #5  
Adaptronic Distributor
RX7Club Vendor
iTrader: (12)
 
Turblown's Avatar
 
Join Date: Dec 2001
Location: Twin Cities, MN
Posts: 6,795
Thanked 11 Times in 11 Posts
If you want the least amount of back pressure , and lowest egts you should go much bigger.
I would use the smallest s300sxe on our page here:
https://turbosource.com/collections/...0-800-hp-turbo

​​​​​
​​​
Turblown is offline  
Reply With Quote
Old 03-07-18, 07:40 AM
  #6  
Eats, Sleeps, Dreams Rotary
iTrader: (14)
 
neit_jnf's Avatar
 
Join Date: Apr 2003
Location: Around
Posts: 3,290
Thanked 7 Times in 6 Posts
Originally Posted by _Alik_ View Post
We need only about 120hp
A 13B based single rotor should be able to provide 120hp+ naturally aspirated depending on porting configuration, is the turbo really needed??
neit_jnf is offline  
Reply With Quote
Old 03-07-18, 08:02 AM
  #7  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Turblown View Post
If you want the least amount of back pressure , and lowest egts you should go much bigger.
I would use the smallest s300sxe on our page here:
https://turbosource.com/collections/...0-800-hp-turbo

​​​​​
​​​
Maybe you didn't see that I need turbo for single rotary engine? This turbo is huge!

Last edited by _Alik_; 03-07-18 at 08:13 AM. Reason: Want to add info
_Alik_ is offline  
Reply With Quote
Old 03-07-18, 08:04 AM
  #8  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by neit_jnf View Post
A 13B based single rotor should be able to provide 120hp+ naturally aspirated depending on porting configuration, is the turbo really needed??
Yes but I need this power on 5-6k and I need good low end power and good start, so only side porting
_Alik_ is offline  
Reply With Quote
Old 03-07-18, 10:12 AM
  #9  
Adaptronic Distributor
RX7Club Vendor
iTrader: (12)
 
Turblown's Avatar
 
Join Date: Dec 2001
Location: Twin Cities, MN
Posts: 6,795
Thanked 11 Times in 11 Posts
Originally Posted by _Alik_ View Post
Maybe you didn't see that I need turbo for single rotary engine? This turbo is huge!
You are correct, most people don't have single rotor engines. That puts you out of the SXE range. If looking to purchase something new this is what I would run with the vband inlet IWG;

https://turbosource.com/collections/...5-450-hp-turbo
Turblown is offline  
Reply With Quote
Old 03-07-18, 12:57 PM
  #10  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
But for 120hp it is very big too?
And I need not ball bearing, just journal.
And I really want as small turbo as it possible.
What do you think about borg warner s1bg with 0.81ar hot side ?
_Alik_ is offline  
Reply With Quote
Old 03-08-18, 08:54 AM
  #11  
Arrogant Wankeler
 
Slides's Avatar
 
Join Date: Nov 2006
Location: Newcastle NSW Australia
Posts: 300
Thanked 7 Times in 7 Posts
Originally Posted by _Alik_ View Post
But for 120hp it is very big too?
And I need not ball bearing, just journal.
And I really want as small turbo as it possible.
What do you think about borg warner s1bg with 0.81ar hot side ?
I think it would be a pretty good match for what you want. I would pick a spec with the larger turbine if will be on load consistently. Is it aviation? I would assume so if using a rotary otherwise fixed load for a pump or even a hover craft or something you would just use a piston motor?
Slides is offline  
Reply With Quote
Old 03-08-18, 12:56 PM
  #12  
Very Stable Genius
iTrader: (1)
 
WANKfactor's Avatar
 
Join Date: May 2011
Location: omnipresent
Posts: 1,149
Thanked 56 Times in 49 Posts
Originally Posted by Turblown View Post
You are correct, most people don't have single rotor engines. That puts you out of the SXE range. If looking to purchase something new this is what I would run with the vband inlet IWG;

https://turbosource.com/collections/...5-450-hp-turbo
I dare say it will still be too big. I was looking into small turbos for my 3.0l diesel ute a while back, (probably >200hp with emphasis on bottom end torque) , really wanted an EFR but no matter how i crunched the numbers the smallest EFR was going to be too big. Funnily i ended up using two of the turbos Slides listed, GT25, and TD04, both with billet hi flow wheels around 41mm inducers. Was looking at getting a S1bg but had trouble sourcing one. Difference in my application though was I was looking for a very tight a/r turbine housing.
WANKfactor is offline  
Reply With Quote
Old 03-08-18, 08:42 PM
  #13  
Automotive Designer
 
SirLaughsALot's Avatar
 
Join Date: Aug 2012
Location: San Jose, CA
Posts: 1,216
Thanked 18 Times in 18 Posts
Definitely agree on the S1BG Part #313798 w/ 0.81 A/R Turbine Housing included.




*Note* The 313798 has 0.81 A/R Turbine Housing included.

If you buy from Full-Race, let them know that Ryan H sent you.


BorgWarner S1BG - Full-Race Motorsports
SirLaughsALot is offline  
Reply With Quote
Old 03-08-18, 09:51 PM
  #14  
Adaptronic Distributor
RX7Club Vendor
iTrader: (12)
 
Turblown's Avatar
 
Join Date: Dec 2001
Location: Twin Cities, MN
Posts: 6,795
Thanked 11 Times in 11 Posts
Originally Posted by WANKfactor View Post
I dare say it will still be too big. I was looking into small turbos for my 3.0l diesel ute a while back, (probably >200hp with emphasis on bottom end torque) , really wanted an EFR but no matter how i crunched the numbers the smallest EFR was going to be too big. Funnily i ended up using two of the turbos Slides listed, GT25, and TD04, both with billet hi flow wheels around 41mm inducers. Was looking at getting a S1bg but had trouble sourcing one. Difference in my application though was I was looking for a very tight a/r turbine housing.
I just released he only wants 125 hp total.... I thought he was asking to add 125hp on top what it's going to make non turbo...
Turblown is offline  
Reply With Quote
Old 03-09-18, 12:55 AM
  #15  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Slides View Post
I think it would be a pretty good match for what you want. I would pick a spec with the larger turbine if will be on load consistently. Is it aviation? I would assume so if using a rotary otherwise fixed load for a pump or even a hover craft or something you would just use a piston motor?
Yes for aviation. Thats why I want as small turbocharger as it possible.

Yes, I understand, I can not find any turbo with such small compressor and so big hot side as on s1bg, maybe you can help me to find.
_Alik_ is offline  
Reply With Quote
Old 03-09-18, 01:03 AM
  #16  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
And could you please help me with exhaust flow calculating?
How can I calculate exhaust flow for example for 5000rpm or 6000rpm on single rotary engine if my power for example 100 or 120hp
And how to match turbocharger hot side to be sure that exhaust flow will be enouth to make necessary boost (for example for s1bg I see I need only about 0.5bar ), but to have as little exhaust backpressure as it possible?
I just use some of my experience in 13b rotary single turbo, so s1bg seems to be good, but Iam not sure.
Thank you for help and responses!

Last edited by _Alik_; 03-09-18 at 07:41 AM. Reason: Add info
_Alik_ is offline  
Reply With Quote
Old 03-12-18, 03:59 AM
  #17  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Can Anybody help me with exhaust flow calculations?
_Alik_ is offline  
Reply With Quote
Old 03-12-18, 07:50 AM
  #18  
Arrogant Wankeler
 
Slides's Avatar
 
Join Date: Nov 2006
Location: Newcastle NSW Australia
Posts: 300
Thanked 7 Times in 7 Posts
Have you looked at the matchbot on the borg warner site? It is pretty good. You work on the 720 degree engine displacement so 1.3L
Slides is offline  
Reply With Quote
Old 03-12-18, 08:27 AM
  #19  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Thank you, I will check it!
_Alik_ is offline  
Reply With Quote
Old 03-13-18, 03:52 AM
  #20  
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: RU
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
I checked it but there is no s1bg turbo (
_Alik_ is offline  
Reply With Quote
Old 03-13-18, 01:47 PM
  #21  
Very Stable Genius
iTrader: (1)
 
WANKfactor's Avatar
 
Join Date: May 2011
Location: omnipresent
Posts: 1,149
Thanked 56 Times in 49 Posts
Yeah , but at least it gives you an idea how you are on the right track with an sbg1 of some size or similar...
BorgWarner MatchBot


Last edited by WANKfactor; 03-13-18 at 02:08 PM.
WANKfactor is offline  
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Musclefella
Single Turbo RX-7's
45
01-30-09 04:47 AM


Thread Tools
Search this Thread
Quick Reply: Turbo setup for single rotary engine.


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: