K26/6 boost vs. rpm curve
07-13-2002, 03:05 PM
#1
Drifting
Thread Starter
Join Date: Dec 2001
Location: St. Louis
Posts: 2,058
Likes: 0
Received 0 Likes
on
0 Posts
K26/6 boost vs. rpm curve
I've searched and can't find a boost curve for a stock 951. This info would be really useful in conjunction with Rob's dme maps to get some ignition tuning insights. 
07-13-2002, 03:26 PM
#2
Nordschleife Master
I have a boost curve for a stock 26/8 with the cycling valve on a dyno if that helps...
<a href="http://members.rennlist.com/adrial/dyno3low.jpg" target="_blank">http://members.rennlist.com/adrial/dyno3low.jpg</a>
And here is a modified (chips, MBC maybe shimmed wastegate?) 26/6 car:
<a href="http://members.rennlist.com/adrial/image002.jpg" target="_blank">http://members.rennlist.com/adrial/image002.jpg</a>
Both were dyno'ed on a dynapack (water brake dyno that bolts up to the hubs).
<a href="http://members.rennlist.com/adrial/dyno3low.jpg" target="_blank">http://members.rennlist.com/adrial/dyno3low.jpg</a>
And here is a modified (chips, MBC maybe shimmed wastegate?) 26/6 car:
<a href="http://members.rennlist.com/adrial/image002.jpg" target="_blank">http://members.rennlist.com/adrial/image002.jpg</a>
Both were dyno'ed on a dynapack (water brake dyno that bolts up to the hubs).
07-17-2002, 05:22 AM
#4
Instructor
Join Date: Jan 2002
Location: SF Bay Area
Posts: 117
Likes: 0
Received 0 Likes
on
0 Posts
Russ,
Neat curves. Can you tell us what was different on the boost curve on the modified set that has way more boost below 3700 RPM? Is this the curve for the MBC?
thanks
Gary
Neat curves. Can you tell us what was different on the boost curve on the modified set that has way more boost below 3700 RPM? Is this the curve for the MBC?
thanks
Gary
07-17-2002, 11:59 AM
#6
Nordschleife Master
[quote]Originally posted by 951Gary:
<strong>Russ,
Neat curves. Can you tell us what was different on the boost curve on the modified set that has way more boost below 3700 RPM? Is this the curve for the MBC?
thanks
Gary</strong><hr></blockquote>
The first dyno curve that doesn't hit full boost untill way up in the revs is my car, bone stock with the cycling valve, etc still in place. The fact that my car had stock boost control in place along with the fact that it has a bigger hotside (#8 vs. #6) produces that curve...where the boost doesn't get going until much later.
Also, the other car was freshly rebuilt...so I'm sure that helps bring the boost on sooner...along with the fact that he had bypassed the cycling valve and has a smaller hotside on the turbo.
--adrial
<strong>Russ,
Neat curves. Can you tell us what was different on the boost curve on the modified set that has way more boost below 3700 RPM? Is this the curve for the MBC?
thanks
Gary</strong><hr></blockquote>
The first dyno curve that doesn't hit full boost untill way up in the revs is my car, bone stock with the cycling valve, etc still in place. The fact that my car had stock boost control in place along with the fact that it has a bigger hotside (#8 vs. #6) produces that curve...where the boost doesn't get going until much later.
Also, the other car was freshly rebuilt...so I'm sure that helps bring the boost on sooner...along with the fact that he had bypassed the cycling valve and has a smaller hotside on the turbo.
--adrial
07-17-2002, 03:05 PM
#7
Race Director
Also the boost drop-off in the high-RPMs on Adrial's car isn't as dramatic as other cars with a K26/6 turbo. Those typically drop to 10-11psi by redline.
