| On the dyno and in World Challenge GT pro racing our manifold has
been giving the results that open up new performance levels for the Porsche
928. With our development program having yielded an increase of 55 horsepower
and outstanding track performance with reliability, we are now prepared to
supply the 928 Developments line of intake manifolds to our customers. Mark
Anderson of 928 International has conducted the dyno testing on his 928 GT
race car, and we have gained an additional 16 horsepower (now 486 rwhp) with
a MAF change since the Sears Point race.
The following are comments made by competitors that give their perspective
on the results.
Mark Anderson of 928 International comments:
"Just got back from a fantastic weekend at Sears Point (now Infinion).
As some of you may know I recently rebuilt my car from the ground up over
the winter and I also fitted the new 928 Development carbon intake system.
I had been working on the car for weeks and we had dynoed the intake but
never had a chance to actually test it so I was very excited. Our initial
test showed an improvement of 40 more rwhp (now 470 total rwhp) but I think
there is more ahead since we are presently using the factory mass air sensor.
I had sent SCCA a formal request to run the new manifold and got a 1 race
provisional which was up for review after this weekend. I am happy to report
that they are now adding it to the 928 vehicle technical sheet so it will
be legal for all 928's to use."
Click here to continue Mark
Andersons's report.
Mark Kibort (World Challenge GT 928 driver) comments:
"Yes, very impressive numbers and performance considering the way that
the package was installed and tested before race proving it. Mark didn't
have a lot of testing time, and had to "ball park" a lot of critical intake
mods to make it all come together. Big HP gains, and it was reliable. I even
saw his exhaust have a quick rich blip between shifts, meaning his mixture
measurements proved that he was good to go and not hurt power or risk the
engine. It idled as a stock engine would and reved as well as his old engine.
Very impressive."
"In talking to most all the fast teams, Mark's HP is now inline."
"Now my problem is being 150hp down vs the 100hp I was down before. If
this intake can provide a 40-50hp improvement to my stock 5 liter engine,
that would be great. "
"Can't wait to see the final version of the single plenum." - Mark Kibort
(needing more power!!!!)
Don Hanson comments:
"Mark Anderson, great job at Sears. It sounds like you had some really
fun racing and did very well indeed. It is also good to see some significant
real progress being made towards further increasing the output of the 928
motor. Proving it's performance and reliability on the track for real world
use is the most important test of any new component. The new Phil manifold
seems to have done it's job well during it's first few outings." - Don
Hanson
Continuation of 928 Developments Report:
Mark Anderson's 10th place finish after a very competitive run with the
fastest cars in the series is tremendous progress for his racing effort and
the 928 in competition.
When I arrived at the track on Saturday afternoon, Mark A was in his
truck talking on the phone and the hood of the car was closed. Everything
was performing well, and there were no issues with the manifold package.
Nice to see that the 12 months of research to find the best high temp materials
was paying off.
As regards the dyno testing, we have now seen a 55 horsepower improvement
over the Extrude Hone GT manifold that Mark ran in competition last year.
All of the testing has been done on the same Dynojet chassis dyno by Mark
and the 928 International team. The baseline for the comparison is an earlier
test (9-17-2002) with the GT manifold before Mark tore the car down for the
winter. The GT combo peaked at 431.4 rwhp at 6000 rpm. The same exact engine
with the addition of the new manifold package with it's twin throttle bodies
and larger MAF has produced 486 rwhp at 6400 rpm, only 400 rpm higher than
the GT manifold and still a very moderate peak HP rpm.
We have maintained a very strong torque curve with the manifold, and
the torque is actually higher than the GT manifold from 1500 to 2700 rpm,
where it dips slightly up to 4600 rpm, at which point it leaves the GT manifold
permanently behind on it's climb upward. The strong low end performance is
rarely seen in a high horsepower intake manifold package and the result of
the unique 928D manifold's design, and will allow the package to be very
effective on the street and with all transmissions. The latest dyno results
are attached.
There is much more power possible, keep in mind that the 928 Intl car
is still using production Porsche cam profile's and moderate compression.
There is of course much more potential with race cams and pistons, and those
improvements should give in excess of 550 rwhp. Our own 928 Developments
5.4L titanium valve race engine is being built with a high rpm cf intake
manifold, and we expect it's output to be even higher.
We have been preparing to supply intake manifolds for all 928's, from
the CIS injected cars to the GTS. We expect all of the models to see power
gains proportional to their output and level of tune. We will be updating
our website with all of this news. Thank you for your time, and please contact
us if you would like to increase your Porsche's power.
Phil Threshie
928 Developments
phil@928developments.com
www.928developments.com
530 333-1758 |
