D1SC 10psi 346ci H/C/I
#21
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I was expecting the same results when i ordered the 4.5" pulley from you. The 9.7 psi is on the high end, its averaging about 8-8.2 psi @6000 rpm. I figured on the intake and heads bringing down the boost a bit but maybe the cam isnt bleeding off much boost and maybe the exhaust isnt all that efficient. I think if i were to put a cut out on it or step up the headers it may bring down the boost. According to hp tuners, the kpa readings off the map on the back of the intake seem to reflect accurate readings and i am using the boost pid map sensor 2 bar - baro, which is getting a true baro reading i think. I guess it wouldnt hurt to get another reading from a different source though.
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#23
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Normally with a bone stock engine with exhaust manifolds, a 4.50 pulley with the 7.65 crank pulley and a D-1SC will get you 9 psi. Add headers and exhaust and it will drop to somewhere around 8 psi. Throw in an aftermarket cam, etc and it drops off from there. Now he is running more compression but I wouldn't expect it to make much of a difference in boost. but Bob
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#24
Normally with a bone stock engine with exhaust manifolds, a 4.50 pulley with the 7.65 crank pulley and a D-1SC will get you 9 psi. Add headers and exhaust and it will drop to somewhere around 8 psi. Throw in an aftermarket cam, etc and it drops off from there. Now he is running more compression but I wouldn't expect it to make much of a difference in boost. but Bob
#25
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That really won't affect it at your boost level. Bob
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#27
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It's always good to double check with a second gauge. Bob
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#28
I ended up ordering a boost gauge, so i ll check the boost and give an update if the 10psi is confirmed with the boost gauge. Just looking around at some other threads though, theres a guy with the same setup as me (larger procharger filter, bypass filter, and larger metal intake tract) who made an additional 4.5psi. Heres the link if anyones curious.
https://ls1tech.com/forums/forced-in...ir-filter.html
https://ls1tech.com/forums/forced-in...ir-filter.html
#29
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I have a 2002 base C5 A4 forged 347 LS6 D1SC (4.38) pulley patriot stage III heads Fast 102 LSXR, LS2 TB with 1 3/4 headers blower cam 3.42 gears.
with bad valve springs and valve float up top, it made 5 lbs of boost on a mustang dyno 430 rwhp 440 tq.
Now on my boost guage with new BTR .660 valve springs, according to my boost guage it's reading 7.5lbs of boost in 93 Hot Florida air.
Don't get hung up on a boost number, if the car is tuned right it will run like a beast.
Hey Bob, how much hp do you think I am making at the wheels, seeing I never re dynoed it?
I am thinking 460rwhp 455 tq.
with bad valve springs and valve float up top, it made 5 lbs of boost on a mustang dyno 430 rwhp 440 tq.
Now on my boost guage with new BTR .660 valve springs, according to my boost guage it's reading 7.5lbs of boost in 93 Hot Florida air.
Don't get hung up on a boost number, if the car is tuned right it will run like a beast.
Hey Bob, how much hp do you think I am making at the wheels, seeing I never re dynoed it?
I am thinking 460rwhp 455 tq.
Last edited by corvet786c; 07-02-2017 at 01:08 PM.
#30
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I have a 2002 base C5 A4 forged 347 LS6 D1SC (4.38) pulley patriot stage III heads Fast 102 LSXR, LS2 TB with 1 3/4 headers blower cam 3.42 gears.
with bad valve springs and valve float up top, it made 5 lbs of boost on a mustang dyno 430 rwhp 440 tq.
Now on my boost guage with new BTR .660 valve springs, according to my boost guage it's reading 7.5lbs of boost in 93 Hot Florida air.
Don't get hung up on a boost number, if the car is tuned right it will run like a beast.
Hey Bob, how much hp do you think I am making at the wheels, seeing I never re dynoed it?
I am thinking 460rwhp 455 tq.
with bad valve springs and valve float up top, it made 5 lbs of boost on a mustang dyno 430 rwhp 440 tq.
Now on my boost guage with new BTR .660 valve springs, according to my boost guage it's reading 7.5lbs of boost in 93 Hot Florida air.
Don't get hung up on a boost number, if the car is tuned right it will run like a beast.
Hey Bob, how much hp do you think I am making at the wheels, seeing I never re dynoed it?
I am thinking 460rwhp 455 tq.
460 to 475 rwhp. What is your compression ratio, your #'s are on the low side. Bob
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#32
Update:
I had to reschedule the dyno due to the fact that my clutch was slipping really bad. Just got it back from the transmission shop and it runs like a complete beast now. The technician said the clutch was toast along with the TO bearing and a couple shift fork pads. That must have been why the car felt "slow" before is that the rpms were revving up but the power wasnt making it to the rear wheels. It also may explain why i was seeing higher than usual boost numbers as the motor wasnt really under any significant load while WOT. Now, the motor should be ingesting all the air the D1 is throwing at it. I ll take some logs and report back what the boost numbers are.
I had to reschedule the dyno due to the fact that my clutch was slipping really bad. Just got it back from the transmission shop and it runs like a complete beast now. The technician said the clutch was toast along with the TO bearing and a couple shift fork pads. That must have been why the car felt "slow" before is that the rpms were revving up but the power wasnt making it to the rear wheels. It also may explain why i was seeing higher than usual boost numbers as the motor wasnt really under any significant load while WOT. Now, the motor should be ingesting all the air the D1 is throwing at it. I ll take some logs and report back what the boost numbers are.
#34
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That's good to see! Bob
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#36
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With your heads and cam I'd expect 600 rwhp with 7 psi. Bob
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#37
Well just to give an update: Heres todays dyno numbers.
601rwhp/515rwtq w/16 degrees of timing.
This was on 10psi utilizing the dynos boost gauge hooked up to the vacuum dist. block. Sorry bob but looks like it is in fact 10psi.
I think theres definately more in it but my tuner didnt want to add any more timing than 16 degrees so i think its a bit conservative although he thinks the bottom end is on borrowed time. I also think that the magnaflow catback and cats are probably robbing hp a bit as well. Overall, im pretty happy though with 600 rwhp.
601rwhp/515rwtq w/16 degrees of timing.
This was on 10psi utilizing the dynos boost gauge hooked up to the vacuum dist. block. Sorry bob but looks like it is in fact 10psi.
I think theres definately more in it but my tuner didnt want to add any more timing than 16 degrees so i think its a bit conservative although he thinks the bottom end is on borrowed time. I also think that the magnaflow catback and cats are probably robbing hp a bit as well. Overall, im pretty happy though with 600 rwhp.