AudiForums.com

Go Back   AudiForums.com > Audi Models > Audi A6
Sign in using an external account
Register Forgot Password?
Register Photos FAQ Members Parts Search Today's Posts Mark Forums Read ExperienceGarageUsed CarsVendor Directory
Search
Welcome to AudiForums.com

Audi A6 The mid-sized Audi A6 model offers more room to the driver and passengers over the A4 line.
Sponsored by Audi USA Parts
Click Here


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #11  
Old 08-07-2008, 06:27 PM
2nd Gear

 
Join Date: Mar 2008
Location: Va
Posts: 532
Default

That is why you get something called a 2 step with that stall speed on the turbo. Your car sits at 4.5rpms spooling and spools instantly sortive like brake boosting. So you can insta spool with a giant turbo
__________________
2001 audi a6 2.7T(tiptronic) Vast Stage3
Rs4 Ko4's, Rs4 Cams, Suspension H&R Coilovers, AWE-Intercoolers, exhaust piggie pipes, straight pipe to APR cats
Support-APR bipipe, APR snub mount -Forged Diverters (upgraded vavle springs),Hose kit
  #12  
Old 08-07-2008, 06:29 PM
2nd Gear

 
Join Date: Mar 2008
Location: Va
Posts: 532
Default

I have been stomped by a 410whp EVO and a 400WHP honda. They were both single turbos and trust me they spooled up quicker. yes they had pretty big turbos ;P
__________________
2001 audi a6 2.7T(tiptronic) Vast Stage3
Rs4 Ko4's, Rs4 Cams, Suspension H&R Coilovers, AWE-Intercoolers, exhaust piggie pipes, straight pipe to APR cats
Support-APR bipipe, APR snub mount -Forged Diverters (upgraded vavle springs),Hose kit
  #13  
Old 08-07-2008, 07:26 PM
hxgaser's Avatar
3rd Gear

 
Join Date: Nov 2007
Location: Northern California
Posts: 1,970
Points: 5,940, Level: 49
Points: 5,940, Level: 49 Points: 5,940, Level: 49 Points: 5,940, Level: 49
Level up: 95%, 10 Points needed
Level up: 95% Level up: 95% Level up: 95%
Daily Activity: 0%
Daily Activity: 0% Daily Activity: 0% Daily Activity: 0%
Default

WTF are you talking about??? 2 steps? 2 step has nothing to do with the turbos at all. It is just a launch control to pull consistent 1/4 mile trap time. As for comparing EVOs and Hondas to Audis, they typically run garret turbos. Most likely GT28 or 30. These are far better turbos than K03s and K04s. Their compressors are larger than K04 but turbine size is smaller and their compressor map is way different. Not only that 4 bangers wind to 8500 rpm easy, while your 2.7T wind to 6500. And your car weighs literally a ton more than the EVOs. Of course your car will be whipped.
__________________
2004 V70R M66 - Current
2001 A6 Avant - Past
2.8 ATQ, Quattro, Tiptronic
Mods - Was chipped, but not now... Was using K&N, but not now...
Repairs - Too many to list! And you wonder why I still drive an Audi So I don't drive one now.
  #14  
Old 08-07-2008, 08:10 PM
2nd Gear

 
Join Date: Mar 2008
Location: Va
Posts: 532
Default

haha no **** I was going to get whipped... the honda was 1800lbs with drag slicks with a giant GT. The evo was full stage3+ cams ect. I still believe a single turbo can produce just as much if not more power and better times than twin turbos.
__________________
2001 audi a6 2.7T(tiptronic) Vast Stage3
Rs4 Ko4's, Rs4 Cams, Suspension H&R Coilovers, AWE-Intercoolers, exhaust piggie pipes, straight pipe to APR cats
Support-APR bipipe, APR snub mount -Forged Diverters (upgraded vavle springs),Hose kit
  #15  
Old 08-07-2008, 08:46 PM
2nd Gear
 
Join Date: Apr 2007
Location: Charlotte, NC
Posts: 1,374
Default

Quote:
Originally Posted by wammy18 View Post
A single turbo is a lot better than a twin turbo sadly... They are bigger with quicker spools.. while our car 1 turbo feeds the other turbo. They have some HUGE single turbos haha
I am no expert but this is incorrect, quite the opposite as a matter fact and why Audi chose this setup (less turbo lag, build high TQ sooner).
We have 2 smaller turbos, for quicker sppoling... but they'll produce less boost and power, max out earlier than the one big turbo.
Also, one turbos does not feed the other... not in sequence, they work in parallel.
__________________


2004 A6 Stg 2+ and 99 TJ...mod
  #16  
Old 08-07-2008, 09:15 PM
Senior Member
 
Join Date: Jun 2008
Location: MARYLAND
Posts: 120
Default

if thats the case Hxgaser, that single boost kick in at a letter time 4k+, then one would expect that the bi should have an enourmous advantage due to the fact that, they kick in earlier and sopposingly generate and sustain alot more power and torgue down the road.Going through this forums , this is the second time someone has brought up this question of bi turbos perfoming less than expected in competition with presumable a lesser car. i am ignorant in this sector but i do have a lot of interest and i am learning alot as well
  #17  
Old 08-07-2008, 10:29 PM
hxgaser's Avatar
3rd Gear

 
Join Date: Nov 2007
Location: Northern California
Posts: 1,970
Points: 5,940, Level: 49
Points: 5,940, Level: 49 Points: 5,940, Level: 49 Points: 5,940, Level: 49
Level up: 95%, 10 Points needed
Level up: 95% Level up: 95% Level up: 95%
Daily Activity: 0%
Daily Activity: 0% Daily Activity: 0% Daily Activity: 0%
Default

You are right, that small turbos spool quicker. (BTW 4K+ is a hypothetical number) But the issue is that small turbos generate lower boost. So the amount of air going through is a lot more with larger turbos in general. Bi-turbos in 2.7T are not designed for high boost numbers from the factory. They perform well all around town, but not really designed for all out racing. Also, 2.7 turbos are not sequential.

A typical sequential turbos have one small turbo feeding directly into the larger turbo. What this accomplishes is that small turbo builds boost quick which allows the larger turbo to spool faster. So you get the best of both world where you have boost through out all engine speed, and have more boost at higher rpm. But in most cases, these setups are not easy to control Dealing with boost buildup, timing, and proper sizing of the turbos are not an easy task.
__________________
2004 V70R M66 - Current
2001 A6 Avant - Past
2.8 ATQ, Quattro, Tiptronic
Mods - Was chipped, but not now... Was using K&N, but not now...
Repairs - Too many to list! And you wonder why I still drive an Audi So I don't drive one now.
  #18  
Old 08-07-2008, 10:39 PM
Senior Member
 
Join Date: Jun 2008
Location: MARYLAND
Posts: 120
Default

wow, you are good. your answer is complete thanx
  #19  
Old 08-07-2008, 10:48 PM
1st Gear
 
Join Date: Aug 2007
Location: Calgary Alberta
Posts: 311
Points: 3,786, Level: 38
Points: 3,786, Level: 38 Points: 3,786, Level: 38 Points: 3,786, Level: 38
Level up: 91%, 14 Points needed
Level up: 91% Level up: 91% Level up: 91%
Daily Activity: 0%
Daily Activity: 0% Daily Activity: 0% Daily Activity: 0%
Default

Just read this post, good for a laugh. HX you nailed it, very complete answer. I would still love to see what a big Gt35/40 single turbo set-up was capable of on the 2.7t motor. Hopefully one day someone (with a streetable car) will show us this set=up. Until then I will stick with my little K04's
__________________
Supreme being
  #20  
Old 08-08-2008, 08:25 AM
2nd Gear

 
Join Date: Mar 2008
Location: Va
Posts: 532
Default

ignorant, nothing77 i think so. Hope you die in your low paying job. Thanks again for bringing nothing to a topic.Def a great answer though haha All of them have been pretty good posts. I still don't find the spool time on the ko4's quicker than the ko3s to be honest. Even putting ko4's spool time vs a 35r I believe they would be really close. The only difference your telling me is the boost when they do spool. Making the (higher boosting single turbo) pull you all the way through mid gear and topend. Ohh and I did not know that about our turbos that one doesn't feed the other. I always thought the drivers side feeds the passanger side. Thanks for the information again. Look at a 1995-1999 bmw m3 turbo kit (600-650chp).. the bmw runs a 3.0-3.2 I believe.
__________________
2001 audi a6 2.7T(tiptronic) Vast Stage3
Rs4 Ko4's, Rs4 Cams, Suspension H&R Coilovers, AWE-Intercoolers, exhaust piggie pipes, straight pipe to APR cats
Support-APR bipipe, APR snub mount -Forged Diverters (upgraded vavle springs),Hose kit

Last edited by wammy18; 08-08-2008 at 09:01 AM.
Old 08-08-2008, 08:25 AM
 
 
 
Reply


Tags
18t, 2001, 27t, a6, audi, chipped, forge, gti, hissing, hoses, jetta, mile, mod, n75, samco


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Pingbacks are On
Refbacks are On


Advertising

Featured Sponsors
Vendor Directory
New Sponsors

All times are GMT -4. The time now is 11:44 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO ©2010, Crawlability, Inc.
Internet Brands, Inc.
Emails Backup