Down on power
04-11-2017, 09:34 AM
#1
Down on power
Took off my fast intake and replaced with a stock intake.
On 10psi it made 6XX, now building 16psi it made 500. Both were made on a dynojet. Nothing abnormal in the logs, no excessive blowby or anything.
Spark is good, plenty of fuel, running 11.3 AFR & 13* @ 6500.
On 10psi it made 6XX, now building 16psi it made 500. Both were made on a dynojet. Nothing abnormal in the logs, no excessive blowby or anything.
Spark is good, plenty of fuel, running 11.3 AFR & 13* @ 6500.
Last edited by Ant-Man; 04-11-2017 at 05:15 PM.
04-11-2017, 10:12 AM
#2
Race Director
Member Since: May 2004
Location: Raleigh, NC
Posts: 16,664
Received 1,194 Likes
on
1,053 Posts
St. Jude Donor '15
So you switched to a fast or switched back to stock? Post isn't very clear
What pulley before and after
What does "fuel" mean? What was used before and after?
What's the rest of the setup?
What pulley before and after
What does "fuel" mean? What was used before and after?
What's the rest of the setup?
04-11-2017, 10:57 AM
#3
Team Owner
More info.
So on 10psi it made over 6000hp but on 16psi it only makes 500. Sounds like you have a huge issue to lose 5500hp.
Details on the 6k hp setup.
So on 10psi it made over 6000hp but on 16psi it only makes 500. Sounds like you have a huge issue to lose 5500hp.
Details on the 6k hp setup.
04-11-2017, 12:08 PM
#4
Took off my fast and replaced with a stock intake.
Fuel is good as in it isn't leaning out or anything.
3.8 pulley before and 3.4 now.
Yep. Stock block/trans/diff ect. Idk why no one hasn't run 4s yet.
Last edited by Ant-Man; 04-11-2017 at 12:11 PM.
04-11-2017, 02:53 PM
#5
Instructor
well is it possible you are running on a different dyno? i know i made 11lbs of boost an barely got to 504 HP on a mustang dyno, but then again i think my tuner is an idiot and i need to find a new one
04-11-2017, 03:54 PM
#6
Race Director
Member Since: May 2004
Location: Raleigh, NC
Posts: 16,664
Received 1,194 Likes
on
1,053 Posts
St. Jude Donor '15
All tuners are idiots except the one tuning your car, just ask them
04-11-2017, 04:49 PM
#7
Safety Car
04-11-2017, 06:53 PM
#9
Race Director
Member Since: May 2004
Location: Raleigh, NC
Posts: 16,664
Received 1,194 Likes
on
1,053 Posts
St. Jude Donor '15
Some of it's just diffeeent ways to do the same thing in the end, some of its a lot of tuners really do some halfass stuff collect their money and kick it out the door. It is what it is
04-11-2017, 09:26 PM
#10
The guy who is tuning it has a pretty good reputation and he's gonna do a compression test but other than that we have no idea where else to look.
04-14-2017, 12:38 PM
#12
Aha! That's a pertinent question!
If I understand - and it does take a bit of interpretation - that your boost has all of a sudden jumped from 10 to 16 psi, and it's making much less power, after switching back to the stock intake, then either someone did something silly like leaving a shop rag inside of the intake plenum, or your cats (if you still have those) look like this:
EDIT: just saw that you changed pulleys as well. Not sure if that kind of pulley change would give you 6 psi of boost??
If I understand - and it does take a bit of interpretation - that your boost has all of a sudden jumped from 10 to 16 psi, and it's making much less power, after switching back to the stock intake, then either someone did something silly like leaving a shop rag inside of the intake plenum, or your cats (if you still have those) look like this:
EDIT: just saw that you changed pulleys as well. Not sure if that kind of pulley change would give you 6 psi of boost??
Last edited by CI GS; 04-14-2017 at 12:43 PM.
04-14-2017, 12:39 PM
#13
Race Director
Member Since: May 2004
Location: Raleigh, NC
Posts: 16,664
Received 1,194 Likes
on
1,053 Posts
St. Jude Donor '15
That would make perfect sense if so. Same thing happened to a guy over on HPT not long ago
04-14-2017, 12:45 PM
#14
Yep, when one of my cats failed at ~12psi the boost jumped by about 2 psi.
Last edited by CI GS; 04-14-2017 at 12:47 PM.
04-14-2017, 02:32 PM
#15
Aha! That's a pertinent question!
If I understand - and it does take a bit of interpretation - that your boost has all of a sudden jumped from 10 to 16 psi, and it's making much less power, after switching back to the stock intake, then either someone did something silly like leaving a shop rag inside of the intake plenum, or your cats (if you still have those) look like this:
EDIT: just saw that you changed pulleys as well. Not sure if that kind of pulley change would give you 6 psi of boost??
If I understand - and it does take a bit of interpretation - that your boost has all of a sudden jumped from 10 to 16 psi, and it's making much less power, after switching back to the stock intake, then either someone did something silly like leaving a shop rag inside of the intake plenum, or your cats (if you still have those) look like this:
EDIT: just saw that you changed pulleys as well. Not sure if that kind of pulley change would give you 6 psi of boost??
I'm kinda guessing it might be a ringland..? The car is a few hours away from me and I'm waiting to hear back on compression.