924Board.org

Guest · Posted: Thu Jun 07, 2001 8:54 am Post subject:

From: Rick MacLaren
Email: rick-maclaren@home.com
Date: 07 Jun 2001
Time: 08:54:15

Has anyone dyno'd their 931? With any or all of the above components:

K & N Filter
Boost controller
Intercooler
Cam (Stage 1)
Lightened flywheel

Anyone? Anyone?

Rick

Guest · Posted: Thu Jun 07, 2001 6:47 pm Post subject:

From: johnh
Email: a924carrera_gt@hotmail.com
Date: 07 Jun 2001
Time: 18:47:08

yeah in about 1989 I put mine on a bosch rolling road,
Car had done about 86,000 miles and horsepower with standard boost (0.7 bar or 10lbs boost) and Carrara GT intercooler horspower was approximately 175
With 0.8 bar boost (12 boost) the horsepower went to 197.
I have the print out sheets to prove (just in case anyone doesn't beleive it).
Alos I'm currently building a newe intercooler for another 931 which has a custom core 75mm thick whereas the Carrera GT one is only 50mm thich, and we have run tests of the car with standard boost, increased boost, increased boost with GT cooler and when the new cooler is finished another test will be done.

There is defintly gains to be had with winding the boost up.

Guest · Posted: Mon Jun 11, 2001 4:29 pm Post subject:

From: dave2
Email: david.c.russell@lmco.com
Date: 11 Jun 2001
Time: 16:29:39

What year 931 were the tests done on?

Guest · Posted: Mon Jun 11, 2001 8:31 pm Post subject:

From: Johnh
Email: a924carrera_gt@hotmail.com
Date: 11 Jun 2001
Time: 20:31:23

Car is a 1981 UK spec unit which was upgraded to Carrera GT spec in 1984 - complete with KS forged pistons rather than the Mahle that most turbo runs. Runs about 8.5:1 comprsssion and boost any where from 0.73 bar (standard 924 turbo) to 1.4 bar wehnthe fuel pumps turn off.