s4 turbo or s5 turbo
04-06-08, 12:09 PM
#1
Senior Member
Thread Starter
iTrader: (1)
Join Date: Nov 2007
Location: Englewood/Dayton Ohio
Posts: 517
Likes: 0
Received 0 Likes
on
0 Posts
s4 turbo or s5 turbo
which motor actually holds up BETTER to boost? and turbo usage? looking to have something safe stock, and upgrade the seals in future, maybe a year at earliest
04-06-08, 08:34 PM
#2
1308cc pure madness
Join Date: Jan 2004
Location: sacramento, CA
Posts: 213
Likes: 0
Received 0 Likes
on
0 Posts
frum wut i hear...the s5 turbo is less prone to boost creep...something im running into with my s4 t2...the s4 t2 only has a 16mm wastegate....sumthing to look at wen upping the boost and installing a high flo exhaust and intake....
04-06-08, 11:44 PM
#3
Senior Member
Thread Starter
iTrader: (1)
Join Date: Nov 2007
Location: Englewood/Dayton Ohio
Posts: 517
Likes: 0
Received 0 Likes
on
0 Posts
so if i get a nice blow off valve and do an fmic will i still have to worry about that? what exactly is boost creep? i am new to turbo.. have gained a bit of knowledge on rotary motor though
04-07-08, 12:04 AM
#4
Rotary Enthusiast
iTrader: (7)
Join Date: Jun 2006
Location: Oakland CALI!
Posts: 961
Likes: 0
Received 0 Likes
on
0 Posts
Boost creep is when boost begins to rise above what it normally should be at. for a S4 5.6LBs I believe. This is caused by a more free flowing exhaust like when you delete your cat, and a undersized wastegate. In a S5 this is not as much of a problem because it has a double wastegate port. If this happens and you are running stock ecu you will experience fuel cut.
04-07-08, 11:54 AM
#5
The s5 is a newer design. It has straight through exhaust on the manifold.
The s4 has a twin scroll setup in which it has a flapper gate that closes to help build more boost at low rpms. It then opens up to let more exhaust flow for higher rpms.
I have an s4 engine with an s5 turbo
The s4 has a twin scroll setup in which it has a flapper gate that closes to help build more boost at low rpms. It then opens up to let more exhaust flow for higher rpms.
I have an s4 engine with an s5 turbo
04-07-08, 08:59 PM
#6
1308cc pure madness
Join Date: Jan 2004
Location: sacramento, CA
Posts: 213
Likes: 0
Received 0 Likes
on
0 Posts
no...that wont solve it...do a search and youll find lots of info....what exactly are u planning to do with the car as far as tuning?...you have to tune for wut you want use the car for or u could end up with problems....
Trending Topics
04-08-08, 08:37 PM
#10
torretos stunt double
iTrader: (2)
Join Date: Jun 2007
Location: fountain valley
Posts: 608
Likes: 0
Received 0 Likes
on
0 Posts
well.. the s5 is electronically based OMP for instance
on the s4 it uses a rod attached to the throttle body
on an s5 the OMP is all electrical
when deleting cats both turbos will cause fuel cut with the stock ecu like he said above
just get a fuelcutcontroller from mazdatrix.
all in all the s5 turbo is better but if an s4 turbo is easier to access just buy it.. and have bnrturbos port your wastegate, you can keep your stock ecu, but recommended to get a piggyback system such as a SAFC and a better fuel pump/injectors. cheap upgrade. porting FTW
on the s4 it uses a rod attached to the throttle body
on an s5 the OMP is all electrical
when deleting cats both turbos will cause fuel cut with the stock ecu like he said above
just get a fuelcutcontroller from mazdatrix.
all in all the s5 turbo is better but if an s4 turbo is easier to access just buy it.. and have bnrturbos port your wastegate, you can keep your stock ecu, but recommended to get a piggyback system such as a SAFC and a better fuel pump/injectors. cheap upgrade. porting FTW
04-09-08, 01:20 PM
#11
1308cc pure madness
Join Date: Jan 2004
Location: sacramento, CA
Posts: 213
Likes: 0
Received 0 Likes
on
0 Posts
well.. the s5 is electronically based OMP for instance
on the s4 it uses a rod attached to the throttle body
on an s5 the OMP is all electrical
when deleting cats both turbos will cause fuel cut with the stock ecu like he said above
just get a fuelcutcontroller from mazdatrix.
all in all the s5 turbo is better but if an s4 turbo is easier to access just buy it.. and have bnrturbos port your wastegate, you can keep your stock ecu, but recommended to get a piggyback system such as a SAFC and a better fuel pump/injectors. cheap upgrade. porting FTW
on the s4 it uses a rod attached to the throttle body
on an s5 the OMP is all electrical
when deleting cats both turbos will cause fuel cut with the stock ecu like he said above
just get a fuelcutcontroller from mazdatrix.
all in all the s5 turbo is better but if an s4 turbo is easier to access just buy it.. and have bnrturbos port your wastegate, you can keep your stock ecu, but recommended to get a piggyback system such as a SAFC and a better fuel pump/injectors. cheap upgrade. porting FTW
04-09-08, 02:38 PM
#14
As far as turbo goes, the s5 is better. Slightly larger turbine.
As far as motor goes, they both have pos and neg. S4 is great because of the low compression rotors. But the S5 has a stronger stud area on the rear plate. They are known to crack on S4s.
As far as motor goes, they both have pos and neg. S4 is great because of the low compression rotors. But the S5 has a stronger stud area on the rear plate. They are known to crack on S4s.
Thread
Thread Starter
Forum
Replies
Last Post