boost question?
08-17-2010, 01:11 AM
#1
2nd Gear Member
Thread Starter
Join Date: Jan 2006
Location: Salem, Oregon
Posts: 264
boost question?
hey u guys i was woundering if this sounds right? Ok i got my vortech v1 on and only boosting 5 psi on a 2.87 pulley.
set up set up.
347 stroker
10,1 compresion
comp XFI 236 cam.
Trick Flow Hi port heads with 2.08 intake valves and port job.
mac 1 3/4 long tubes, pro chamber 3" all the way to the tail pipes.
Trick Flow R intake
75mm TB 76mm MAF sensor calibleted for the 30lb injectors
255-fuel pump
set up set up.
347 stroker
10,1 compresion
comp XFI 236 cam.
Trick Flow Hi port heads with 2.08 intake valves and port job.
mac 1 3/4 long tubes, pro chamber 3" all the way to the tail pipes.
Trick Flow R intake
75mm TB 76mm MAF sensor calibleted for the 30lb injectors
255-fuel pump
08-17-2010, 12:28 PM
#3
6th Gear Member
Join Date: Apr 2007
Location: California
Posts: 10,468
Yeah, the restriction in the engine makes the pressure. If the engine flows well then it will show lower boost pressure for a given pulley, but flow relatively more air. I wouldn't worry about it unless it doesn't perform like you expect it should. Has it been on a dyno?
08-17-2010, 08:28 PM
#5
08-18-2010, 08:52 AM
#6
2nd Gear Member
Thread Starter
Join Date: Jan 2006
Location: Salem, Oregon
Posts: 264
67mustang; i think your right cuz it dose run grate and pulls nice! also it dose run good right at 40lb of fuel pressure if i go up it cuts out right at 5psi it seems to run rich right now how it sit's but i think it's cuz of my fmu it has a 4.1 disc in it should be a 6.1 ratio for my 30s right?
and no it hasent been on a dino. i have ran 11.9 NA with a 1.96 60ft at 118mph
and on the boost it would cut out if i was to punch it all the way down so i had to baby it a lil and ran a 13.1 at 122mph with 45lb of fuel. lol my 60ft way like a 2.69. i no it cold do way better cuz my boost would only be right at 3 and 4psi, first and 2nd gear were like all motor but yea its not leaning out at all with that disc and also after the track i cleand out my maf and it healped a bunch with the cut out problem. i also did lower the fuel to 40psi it dose need tuned i have just been messing with it my self for now tho. i do want to boost 8 9 or 10psi tho to see what it dose and hope it dose stay togeather. lol
and no it hasent been on a dino. i have ran 11.9 NA with a 1.96 60ft at 118mph
and on the boost it would cut out if i was to punch it all the way down so i had to baby it a lil and ran a 13.1 at 122mph with 45lb of fuel. lol my 60ft way like a 2.69. i no it cold do way better cuz my boost would only be right at 3 and 4psi, first and 2nd gear were like all motor but yea its not leaning out at all with that disc and also after the track i cleand out my maf and it healped a bunch with the cut out problem. i also did lower the fuel to 40psi it dose need tuned i have just been messing with it my self for now tho. i do want to boost 8 9 or 10psi tho to see what it dose and hope it dose stay togeather. lol
08-22-2010, 01:39 PM
#8
2nd Gear Member
Thread Starter
Join Date: Jan 2006
Location: Salem, Oregon
Posts: 264
ok NM i took of my fmu and bumped the fuel psi to 55 and ran it and it would still cut out what do u guy think it might be then? i was thinking my MAF sensor cuz its not a suck trough. oh it only cuts out when i punch it not when i feed it gas.