Still can't figure this one out! I'm losing sleep over this. Ok, i have a fully built super coupe motor with MPX case, MPX intake plenum, 5% supercoupe performance jackshaf pulley, 5% supercoupe performance blower pulley, and magnum powers 10% crank pulley. Basically i cant make boost like 8-10 pounds. I pressure tested everything... No leaks. maybe belt slip? I do have MPX tensioner spring... My bypass valve is working properly. This is just crazy cause the reason why I put all the MPX goodies on was because my early style blower was making 8 pounds. WELL MY MPX IS DOING THE SAME THING... I just don't no.
Also when i get about 50% throttle 3000 rpms, 8 pounds of boost, the motor stutters... think this is caused by ignition blow out but im not sure. But ive never seen this happen at such low boost levels. Im running ls2 coil packs with ngk spark plugs gaped at .030. any thoughts?
and another concern is im only reading about 12 on the vacuum side. Is this because of the larger cam and valves?
here is my build info:
(Neutral balanced motor)
8.8:1 CR Wiseco forged pistons
Eagle 5.956 I-beam rods
99 3.8 block
2001 crankshaft
Neutral billet steel balancer and aluminum flywheel
1.7 Stud mount rocker arm kit
1.85/1.55 stainless steel valves
Windage tray
CompCams 218/224 .51/.51 112 Billet cam
Set Manley retainers and Crane locks
1.85/1.55 stainless steel valves
Ported heads and intake manifold
Eaton m90 roots blower with custom made raised top, aluminum piping and front mount intercooler
20% OVERDRIVE
60 lbs injectors
Adjustable fuel regulator with rail mounted gauge
255 fuel pump
Tremec TKO tranny 5spd
Long tube headers (modified)
Custom made Stainless w spin tech mufflers side exhaust
85 mm throttle body
MpX case
Mpx intake plenum
Plx wide band.
Wolf ems version 4.72
New 8.8 rear end w 3.73 gears posi
aluminum drive shaft
probably more….
IM REALLY LOST HERE...
ANY IDEAS WOULD BE GREAT.
THANKS GUYS!!
Also when i get about 50% throttle 3000 rpms, 8 pounds of boost, the motor stutters... think this is caused by ignition blow out but im not sure. But ive never seen this happen at such low boost levels. Im running ls2 coil packs with ngk spark plugs gaped at .030. any thoughts?
and another concern is im only reading about 12 on the vacuum side. Is this because of the larger cam and valves?
here is my build info:
(Neutral balanced motor)
8.8:1 CR Wiseco forged pistons
Eagle 5.956 I-beam rods
99 3.8 block
2001 crankshaft
Neutral billet steel balancer and aluminum flywheel
1.7 Stud mount rocker arm kit
1.85/1.55 stainless steel valves
Windage tray
CompCams 218/224 .51/.51 112 Billet cam
Set Manley retainers and Crane locks
1.85/1.55 stainless steel valves
Ported heads and intake manifold
Eaton m90 roots blower with custom made raised top, aluminum piping and front mount intercooler
20% OVERDRIVE
60 lbs injectors
Adjustable fuel regulator with rail mounted gauge
255 fuel pump
Tremec TKO tranny 5spd
Long tube headers (modified)
Custom made Stainless w spin tech mufflers side exhaust
85 mm throttle body
MpX case
Mpx intake plenum
Plx wide band.
Wolf ems version 4.72
New 8.8 rear end w 3.73 gears posi
aluminum drive shaft
probably more….
IM REALLY LOST HERE...
ANY IDEAS WOULD BE GREAT.
THANKS GUYS!!