Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIV Supra

Reply
 
Thread Tools Display Modes
Old 07-17-2007, 03:29 AM   #1
laffie
Stock
 
Join Date: Jun 2007
Location: Montreal
Posts: 2
laffie is on a distinguished road
Default turbo questions

well i was wondering whats the difference between sequential twint turbos and pararrel twin turbos? Also why two turbo have less lag than one big turbo? Is it because its easier to spin two small wheel than one big? If i have one big turbo and i don't want the lag, can i just switch to a less heavy wheel?

tx alot
laffie is offline   Reply With Quote
Old 07-18-2007, 01:31 AM   #2
pwpanas
Supra Owner
 
pwpanas's Avatar
 
Join Date: Oct 2005
Location: GA, USA
Posts: 2,209
pwpanas is on a distinguished road
Default

Quote:
Originally Posted by laffie
well i was wondering whats the difference between sequential twint turbos and pararrel twin turbos?...
With sequential turbos, the setup first makes boost from one turbo alone, and then it switches to making boost from both turbos. This lets you get boost almost twice as quickly.
Quote:
Originally Posted by laffie
...Also why two turbo have less lag than one big turbo? Is it because its easier to spin two small wheel than one big?...
Two turbos (in parallel) do NOT have less lag than one big turbo. Only sequential twins reduce lag.
Quote:
Originally Posted by laffie
...If i have one big turbo and i don't want the lag, can i just switch to a less heavy wheel?...
Sure, but then it wouldn't be a big turbo anymore (less heavy = smaller).
__________________
Phil '94 Supra Turbo, 6spd, 'APU'+
Displacement is no replacement for boost.
Life begins at 30psi.


NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.
pwpanas is offline   Reply With Quote
Old 07-18-2007, 03:50 AM   #3
laffie
Stock
 
Join Date: Jun 2007
Location: Montreal
Posts: 2
laffie is on a distinguished road
Default

thank you very much!! but why only sequential turbos reduce lag?
laffie is offline   Reply With Quote
Old 07-19-2007, 12:24 AM   #4
pwpanas
Supra Owner
 
pwpanas's Avatar
 
Join Date: Oct 2005
Location: GA, USA
Posts: 2,209
pwpanas is on a distinguished road
Default

Quote:
Originally Posted by laffie
thank you very much!! but why only sequential turbos reduce lag?
100% of the exhaust goes through only one of the two small turbos first, and all that exhaust flow spools that first small turbo at (for example) 2250 rpms. At 3500 rpms, there's enough total exhaust flow to spool both turbos, so exhaust valves open and then both turbos run together.
__________________
Phil '94 Supra Turbo, 6spd, 'APU'+
Displacement is no replacement for boost.
Life begins at 30psi.


NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.
pwpanas is offline   Reply With Quote
Old 07-21-2007, 04:57 PM   #5
cageceo
Intake
 
Join Date: Jul 2007
Location: Delete Profile
Posts: 48
cageceo is on a distinguished road
Default

Cool, lol, i didn't know that exactly. i had the concept that on sequential turbos went on one after another.

example.

turbo 1. engages at 2500Rpm
turbo 2. engages at 3500-4000 Rpm, and shuts off the first turbo.

so basically you always got turbo on almost a full power range. that's just what i had thought, but Glad to know the truth. seems alot more effcient the true way.
__________________
Delete Profile
cageceo is offline   Reply With Quote
Old 07-21-2007, 05:26 PM   #6
pwpanas
Supra Owner
 
pwpanas's Avatar
 
Join Date: Oct 2005
Location: GA, USA
Posts: 2,209
pwpanas is on a distinguished road
Default

Quote:
Originally Posted by cageceo
Cool, lol, i didn't know that exactly. i had the concept that on sequential turbos went on one after another.

example.

turbo 1. engages at 2500Rpm
turbo 2. engages at 3500-4000 Rpm, and shuts off the first turbo..
That'd be pretty weird. Why turn off the 1st turbo? What would be the benefit of that setup over a single turbo system? In other words, why would you think it was designed that way?
Quote:
Originally Posted by cageceo
...so basically you always got turbo on almost a full power range. that's just what i had thought, but Glad to know the truth. seems alot more effcient the true way.
Yep the 1st turbo never turns off, except below about 2250rpms...
__________________
Phil '94 Supra Turbo, 6spd, 'APU'+
Displacement is no replacement for boost.
Life begins at 30psi.


NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.
pwpanas is offline   Reply With Quote
Old 07-23-2007, 05:50 AM   #7
JPDsupra
3" Exhaust
 
Join Date: Apr 2007
Location: New Jersey
Posts: 65
JPDsupra is on a distinguished road
Default

jw who's Sam Mahdavi and what interview is it on a website
JPDsupra is offline   Reply With Quote
Old 07-23-2007, 10:55 AM   #8
pwpanas
Supra Owner
 
pwpanas's Avatar
 
Join Date: Oct 2005
Location: GA, USA
Posts: 2,209
pwpanas is on a distinguished road
Default

Quote:
Originally Posted by JPDsupra
jw who's Sam Mahdavi and what interview is it on a website
cageceo posted a link to it in his/her post here:
http://www.toyota-supra.info/forums/...79&postcount=7
__________________
Phil '94 Supra Turbo, 6spd, 'APU'+
Displacement is no replacement for boost.
Life begins at 30psi.


NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.
pwpanas is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
HELP PLEASE Nick0887 Non-Generation Specific Questions 4 02-28-2009 07:26 AM
questions of using an w58 instead of turbo auto? demon2supra MKIII Supra 8 04-20-2008 06:04 AM
Dream Offer Karma_Supra MKIV Supra 22 10-17-2007 03:04 PM
Sequential Turbo Question suprapoweredsoarer MKIV Supra 1 06-06-2006 12:13 AM
87 turbo questions!! Reeves MKIII Supra 2 03-04-2006 12:36 AM


All times are GMT. The time now is 02:12 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87