Safe to rise boost without new chip?
05-17-2002 | 05:57 AM
#1
Thread Starter
Nordschleife Master
Joined: Aug 2001
Posts: 5,552
Likes: 18
From: Stockholm, Sweden
Safe to rise boost without new chip?
I have a Turbo S with a K27/8 turbo and a free flow exhaust. I'm at stock boost level and I currently don't have an adjustable fuel pressure regulator.
Would it be safe for me get an AFPR and rise the boost to about 0,90 - 0,99 bar?
Or do I need to get a new pair of chip's to be on the safe side!?
Also, would it be any different if I had a K26/8 turbo? (a friend's car)
Would it be safe for me get an AFPR and rise the boost to about 0,90 - 0,99 bar?
Or do I need to get a new pair of chip's to be on the safe side!?
Also, would it be any different if I had a K26/8 turbo? (a friend's car)
05-17-2002 | 07:39 AM
#2
Instructor
Joined: Jul 2001
Posts: 154
Likes: 0
From: Columbus, OH
I have an '86 951 with a dual port wastegate and I have run it up to 20psi and still been rich under WOT (i will be getting chips). It hits the fuel cutoff without chips when high boost is held at high rpms.
Get an A/F meter before you go screwing with the boost. Run lean and you'll blow a gasket.
Chris
Get an A/F meter before you go screwing with the boost. Run lean and you'll blow a gasket.
Chris
05-17-2002 | 09:20 AM
#3
Thread Starter
Nordschleife Master
Joined: Aug 2001
Posts: 5,552
Likes: 18
From: Stockholm, Sweden
[quote]Originally posted by loki:
<strong>Get an A/F meter before you go screwing with the boost. Run lean and you'll blow a gasket.
Chris</strong><hr></blockquote>
Just bought an Autometer A/F guage and a large boost guage an hour ago
Do you know how much boost you can run before it cuts of fuel?
Regards
Gustaf
<strong>Get an A/F meter before you go screwing with the boost. Run lean and you'll blow a gasket.
Chris</strong><hr></blockquote>
Just bought an Autometer A/F guage and a large boost guage an hour ago
Do you know how much boost you can run before it cuts of fuel?
Regards
Gustaf
05-17-2002 | 09:47 AM
#4
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Joined: Nov 2001
Posts: 761
Likes: 0
From: Amherst, NH
Duke --
Each car is a smidge different. Hook up the air/fuel meter, the boost gauge and see what happens under load. If you're still going full rich then you can safely increase boost pressure a bit. If you start to lean out, then you're boosting too high.
HTH!
Each car is a smidge different. Hook up the air/fuel meter, the boost gauge and see what happens under load. If you're still going full rich then you can safely increase boost pressure a bit. If you start to lean out, then you're boosting too high.
HTH!
05-18-2002 | 09:33 PM
#5
Race Director
Joined: Jul 2001
Posts: 14,075
Likes: 3
From: Santa Barbara, CA
Do you really have a K27/8 in your TurboS? Then most likely you've already have some custom chips in there since the flow patterns of the K27/8 is completely different from a K26/8. Adjusting fuel-pressure won't work because you'll end up with some real rich spots in the RPM-range, while others will be too lean...
05-19-2002 | 10:05 AM
#6
Thread Starter
Nordschleife Master
Joined: Aug 2001
Posts: 5,552
Likes: 18
From: Stockholm, Sweden
[quote]Originally posted by Danno:
<strong>Do you really have a K27/8 in your TurboS? Then most likely you've already have some custom chips in there since the flow patterns of the K27/8 is completely different from a K26/8. Adjusting fuel-pressure won't work because you'll end up with some real rich spots in the RPM-range, while others will be too lean...</strong><hr></blockquote>
I've got a K26/27 hybrid, does it also have a completely different flow pattern?
<strong>Do you really have a K27/8 in your TurboS? Then most likely you've already have some custom chips in there since the flow patterns of the K27/8 is completely different from a K26/8. Adjusting fuel-pressure won't work because you'll end up with some real rich spots in the RPM-range, while others will be too lean...</strong><hr></blockquote>
I've got a K26/27 hybrid, does it also have a completely different flow pattern?