MARKGSTI
03-06-2006, 11:36 AM
Its been awhile since aftermarket heads/cams have been out for the 2.5l STI motor.
There has been alot throwin around of dyno #'s...and theory about shoulda/woulda gains with head porting and aftermarket cams.
In the last few months we've locally gotten to see what a good set of heads/cams can do.
The cars:
FP red equipped STI with a Crawford S3l motor and a full DPR head job with stage 2.5 cams.
GT35r equipped STI with a Gruppe-S stage2+ motor with DPR headwork and stage 4 cams.
As is the norm the car have all the supporting mods like fuel upgrades/FMIC/exhuast etc etc...and even meth injection.
Fact:On 91 octane gas the cars put down about 30-35whp MORE whp then the others STIs with the same turbos and same tuner without the headwork/cams... and as the boost goes up so do the differences.
They spool faster, require less boost to make the same power as a factory cammed/non headworked car.
I know alota you guys have done your homework...but so far i've seen more hearsay and purchases made on promises then real world gains.
Just thought i'd share the info i know...Its smart to know what gains you'll see before a 3-4k investment is made :)
There has been alot throwin around of dyno #'s...and theory about shoulda/woulda gains with head porting and aftermarket cams.
In the last few months we've locally gotten to see what a good set of heads/cams can do.
The cars:
FP red equipped STI with a Crawford S3l motor and a full DPR head job with stage 2.5 cams.
GT35r equipped STI with a Gruppe-S stage2+ motor with DPR headwork and stage 4 cams.
As is the norm the car have all the supporting mods like fuel upgrades/FMIC/exhuast etc etc...and even meth injection.
Fact:On 91 octane gas the cars put down about 30-35whp MORE whp then the others STIs with the same turbos and same tuner without the headwork/cams... and as the boost goes up so do the differences.
They spool faster, require less boost to make the same power as a factory cammed/non headworked car.
I know alota you guys have done your homework...but so far i've seen more hearsay and purchases made on promises then real world gains.
Just thought i'd share the info i know...Its smart to know what gains you'll see before a 3-4k investment is made :)