type of turbos

25

Asked by Nov 28, 2007 at 06:51 PM about the 2002 Audi S4

Question type: General

how do these turbos work? do they work together?

5 Answers

more info needed.

43,945

Assuming you're talking the twin turbos? If so, I believe they do work together to increase air intake at a faster rate than a single turbo.

15

i'm assuming you have the 2.7 liter v6 biturbo....so i'm working from that based on my knowledge of mine...the first turbo spools up at the lower rpm range to cut the usual turbo lag, then the other kicks in near the upper range of the first and continues to the higher rpms....so the big upside is that you have a constant turbo powerband whereas most single turbo configurations have no power gain until a certainpev range

5

Evan ... both of your turbos operate in parallel. They are equal in size and they respond in the same way at the equivalent RPM. What you are describing when one spools first and then the other occurs in only a select number of cars ... and the 2.7T V6 is not one of them. The last generation Toyota Supra had a small and larger turbo in series and would do just what you described. The smaller one would spool first at lower RPM and the larger one would come on later in the RPM range to provide more boost pressure. The 3rd Gen Twin-Turbo RX-7 used a series of vacuum tubes that would control which of their equally sized turbo would respond when. In the RX7 one turbo would spool at lower RPM and then have the second one spool after around 4000 RPM or so. And, I believe the latest BMW 335 also has a twin turbo system that operates in a similar (though be it more advances) manner to that of the Supra. Your 2.7T V6 is plenty powerful but it is just a plain twin-turbo set-up with both operating in parallel. You'll also notice that if it's chipped and you've openned up the intake and exhaust a little, this set-up is very 'peaky' ... meaning that the turbos are very strong in the mid-range when they are in full song but run out of breath after 6000 RPM or so. This is very characteristic of just a straight single turbo set-up. To get around this you need to upgrade the turbo's to flow more air (ie go to Stage III w/ K04 turbos and supporting hardware).

155

They work concurrently. They are not "sequential."

Your Answer

Add photo

Related Questions

S4

Looking for a Used S4 in your area?

CarGurus has 1,719 nationwide S4 listings starting at $4,650.

ZIP:

Search Audi S4 Questions

Audi S4 Experts

#1 Cynergyzed
Cynergyzed
Reputation 170
#2 Ryan Conde
Ryan Conde
Reputation 150
#3 bachmusic
bachmusic
Reputation 110
View All

Related Models For Sale

Used Audi A4
307 Great Deals out of 10,499 listings starting at $1,000
Used BMW 3 Series
1,020 Great Deals out of 31,415 listings starting at $1,000
Used BMW M3
33 Great Deals out of 1,332 listings starting at $5,995
Used Audi S6
8 Great Deals out of 436 listings starting at $3,500
Used Audi S3
9 Great Deals out of 594 listings starting at $25,991
Used Audi A6
134 Great Deals out of 6,091 listings starting at $2,488
Used Mercedes-Benz C-Class
630 Great Deals out of 24,690 listings starting at $1,995
Used Audi RS 4
52 listings starting at $21,995
Used BMW 5 Series
483 Great Deals out of 16,405 listings starting at $650
Used Ford Mustang
682 Great Deals out of 44,475 listings starting at $1,500
Used Mercedes-Benz E-Class
429 Great Deals out of 19,612 listings starting at $1,200

Used Cars For Sale

2018 Audi S4 For Sale
656 listings starting at $53,250
2016 Audi S4 For Sale
50 listings starting at $36,999
2015 Audi S4 For Sale
5 Great Deals out of 103 listings starting at $29,945
2014 Audi S4 For Sale
18 Great Deals out of 237 listings starting at $22,988
2013 Audi S4 For Sale
6 Great Deals out of 112 listings starting at $21,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.