Originally Posted by willwren
I may be wrong, but my understanding is that you'll still need to skew the injectors, even with the ported rear.
From my experience on a local car, that is the case. A local guy put a powerlog on his GTP that already had ported manifolds, and the car slowed down noticably and actually had an increase of KR. Before the powerlog it would smoke the tires from a 30mph roll, and from a 20mph roll it would barely chirp them with the log. It was BAD. He called me and told me how pissed off he was and how much slower his car was.
The next day I made a trip over there and we skewed his injectors and it woke WAY up. Gained its original power back and then some. Its amazing what skewing a few injectors can do for performance.
I understand his situation seems to be a pretty extreme one, but from what I saw from his car I'd recommend everyone to skew their injectors with the powerlog.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!