The Official Centrifugal Pulley/Boost Combo Thread!!!

JetmechF16

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Photo Jan 12, 14 04 10.jpg
 

04YellowGT

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Sep 29, 2005
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644
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Indiana
2011 Mustang GT
1. 4V Stock
2. ProCharger P1X Stage II Intercooled
3. Stock bore and stroke, 11:1 compression
4. Stock Heads
5. Stock Cams
6. Stock
7. Intercooled Air/Air
8. MBRP LT Headers, MBRP Catted H, MBRP Axle Back
9. 4.00" pulley, Stock 7.65" Crank Pulley
10. 11lbs @ 7200RPM
11. N/A
12. 644 RWHP / 466 RWTQ @ 7200 rpm
 

mcobra01

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Dec 15, 2002
Messages
310
Location
los angeles
2001 cobra


1. 4V
2. D1sc
3. Stock compression
4. Stage 2 C heads
5. Stock
6. Stock intake
7. Stage 1 prochager a/a
8. Jba headers, 2.5 Magnaflow xpipe and mufflers
9. 3.2 pulley stock crank
10. 11 lbs
11. Power pipe
12. 512hp 446 torque 91 octane
 

mcobra01

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Dec 15, 2002
Messages
310
Location
los angeles
2001 Cobra new combo


1. 4V
2. F1a
3. Stock
4. Stage 2 C heads
5. Stock
6. Stock intake w/spacer
7. Prochager race intercooler
8. Jba headers, 2.5 full magnaflow exhaust
9. 4” pulley and 3.4 pulley
10. 20 lbs and 24 lbs
11. Powerpipe
12. 646hp 555 torque & 712hp 630 torque both on e85

Tuner mentioned my powerpipe is a restriction on the 3.4 pulley
 

JetmechF16

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Huffman, TX
1. 4V, stock Cobra C-heads with Brian Tooley springs
2. Procharger F-1A-94
3. 5.3 Boss block stroker 9.8-1 cr
4. Stock C-heads
5. Stock 2004 Cobra cams
6. Sullivan lower, HPP custom forward-facing upper
7. A/A Treadstone TRST9 intercooler
8. JBA 1-5/8 midlengths, JBA 3'' h-pipe w/resonators, JBA 3'' catback w/4'' tips
9. Stock diameter ATI damper w/HOB 7.65" 8-rib crank pulley, 3.875'' blower pulley
10. 18 psi @ 6400 rpm
11. Custom fabbed piping
12. 775/680 at 21 degrees timing

I really need cams, the stockers are holding it back in the upper rpms.
 
Last edited:

therealshocker

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Jan 18, 2007
Messages
116
Location
Memphis, TN
99 Cobra

1. 4V stock displacement
2. F1A
3. 9.7:1
4. Stock heads
5. Bullet Racing custom blower cams, PAC springs/retainers
6. Stock intake
7. Treadstone 1245-28 Air to Air intercooler
8. American Racing 1 3/4" long tubes, 3" x-pipe, 3" Magnapack catback
9. Using House of Boost renegade bracket setup (Stock diameter ATI damper, 8" crank pulley for blower), 4.385'' 8-rib Griptec blower pulley
10. Seeing 20-21psi boost
11. Custom fabbed 3.5" piping
12. 902/810 at 16.5* timing on E85 (Perfect dyno weather, started with a negative DA, and stayed around 0)

Ran out of injector (FIC1000 as I was planning to be on 93 oct when build started) and started going lean around 6500rpm, stopped pulls at 6800. Switching to FIC1300 and will try again.

Engine-Bay.jpg

Dyno-Sheet.jpg
 

milktasd2

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May 2, 2004
Messages
956
Location
Jackson,Ms
99 Cobra

1. 4V stock displacement
2. F1A
3. 9.7:1
4. Stock heads
5. Bullet Racing custom blower cams, PAC springs/retainers
6. Stock intake
7. Treadstone 1245-28 Air to Air intercooler
8. American Racing 1 3/4" long tubes, 3" x-pipe, 3" Magnapack catback
9. Using House of Boost renegade bracket setup (Stock diameter ATI damper, 8" crank pulley for blower), 4.385'' 8-rib Griptec blower pulley
10. Seeing 20-21psi boost
11. Custom fabbed 3.5" piping
12. 902/810 at 16.5* timing on E85 (Perfect dyno weather, started with a negative DA, and stayed around 0)

Ran out of injector (FIC1000 as I was planning to be on 93 oct when build started) and started going lean around 6500rpm, stopped pulls at 6800. Switching to FIC1300 and will try again.

View attachment 1641930
View attachment 1641931
Your numbers are giving me goose bumps. I’m so ready to see what mine will do if it will ever get finished.
 

98 Saleen Cobra

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Feb 28, 2007
Messages
19,522
Well I won't have updated number for a dyno, but I did throw a 2.90" pulley on the car.. It was going 124's in the 1/8th with a 3.33" upper and 19psi.. See what it'll do on the 2.90"
 

01yellercobra

AKA slo984now
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Joined
Oct 5, 2005
Messages
21,128
Location
Cali
99 Cobra

1. 4V stock displacement
2. F1A
3. 9.7:1
4. Stock heads
5. Bullet Racing custom blower cams, PAC springs/retainers
6. Stock intake
7. Treadstone 1245-28 Air to Air intercooler
8. American Racing 1 3/4" long tubes, 3" x-pipe, 3" Magnapack catback
9. Using House of Boost renegade bracket setup (Stock diameter ATI damper, 8" crank pulley for blower), 4.385'' 8-rib Griptec blower pulley
10. Seeing 20-21psi boost
11. Custom fabbed 3.5" piping
12. 902/810 at 16.5* timing on E85 (Perfect dyno weather, started with a negative DA, and stayed around 0)

Ran out of injector (FIC1000 as I was planning to be on 93 oct when build started) and started going lean around 6500rpm, stopped pulls at 6800. Switching to FIC1300 and will try again.

View attachment 1641930
View attachment 1641931
This really makes me wish I had my 01 dynoed. I had my F1A at 19psi with similar timing. But I had a ported intake and a big bore stroker.
 

96dreamer

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Feb 22, 2007
Messages
2,233
Location
St.Louis
1. 4V c heads
2. novi2000
3. Stock stroke, Flat top .010 pistons@ 10.65:1
4. Hand ported, BTR springs
5. Stock 96 cobra
6. Ported mach1 lower, C lower to B upper adapter and stock B upper
7. TR1245 A/A 3.0" piping
8. BBK 1-5/8 to 2.5" collector, o/r x pipe Borla catback
9. 3.25 blower pulley, IW 10% od(7.25" crank), 114.5" Dayco gold belt
10. 13.8lbs at 6000 rpm
11. 4" to fender well
12. ?? never been on the Dyno. Made 325 NA, Thinking around 600hp.

Still running the stock hard lines from the tank to regulator. Fuel pressure starts dropping off ~5500 rpm and by 6k AFR's get uncomfortable high.
 

98 Saleen Cobra

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Feb 28, 2007
Messages
19,522
99 Cobra
1. 4.6 4V
2. F1A-94
3. 281ci / 11.1
4. Stock C Heads (Good Springs)
5. Bullet Cams (Todd Specs)
6. Sullivan Intake
7. Chiseled A/A Intercooler (A/W Coming Soon)
8. 3" Borla's
9. Cog Pulley (88/44)
10. 35psi @ 8000 RPM
Awesome man! it was good chatting with you a while back on FB messenger.
 

JetmechF16

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Messages
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99 Cobra
1. 4.6 4V
2. F1A-94
3. 281ci / 11.1
4. Stock C Heads (Good Springs)
5. Bullet Cams (Todd Specs)
6. Sullivan Intake
7. Chiseled A/A Intercooler (A/W Coming Soon)
8. 3" Borla's
9. Cog Pulley (88/44)
10. 35psi @ 8000 RPM

Damn, 8k rpms on stock heads, that's awesome!! Can't wait to see these numbers.
 

98 Saleen Cobra

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Messages
19,522
Damn, 8k rpms on stock heads, that's awesome!! Can't wait to see these numbers.
Hes a NT car. I doubt he’ll post numbers. He doesn’t need a Dyno to tune it since he has a holley. But it would be cool to see. Super cool guy I chatted with him a bit a few weeks ago
 

therealshocker

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Joined
Jan 18, 2007
Messages
116
Location
Memphis, TN
99 Cobra

1. 4V stock displacement
2. F1A
3. 9.7:1
4. Stock heads
5. Bullet Racing custom blower cams, PAC springs/retainers
6. Stock intake
7. Treadstone 1245-28 Air to Air intercooler
8. American Racing 1 3/4" long tubes, 3" x-pipe, 3" Magnapack catback
9. Using House of Boost renegade bracket setup (Stock diameter ATI damper, 8" crank pulley for blower), 4.385'' 8-rib Griptec blower pulley
10. Seeing 20-21psi boost
11. Custom fabbed 3.5" piping
12. 902/810 at 16.5* timing on E85 (Perfect dyno weather, started with a negative DA, and stayed around 0)

Ran out of injector (FIC1000 as I was planning to be on 93 oct when build started) and started going lean around 6500rpm, stopped pulls at 6800. Switching to FIC1300 and will try again.

View attachment 1641930
View attachment 1641931

Went back last week to try again after swapping to 1300cc injectors and a 4R70 swap, made 850/745 at 6500rpm on first full pull. Second pull was to 7000 and it flatlined on power and boost after 6500. Threw a new belt on and tried again and same thing. Not sure if I have maxed out the intercooler, or maybe getting all I will get out of the stock intake. I went back and watched videos of the pulls and once it hit 22psi around 6300 it just stayed there, so not sure there was much if any belt slip.

Here are both 7000rpm pulls
 

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milktasd2

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Went back last week to try again after swapping to 1300cc injectors and a 4R70 swap, made 850/745 at 6500rpm on first full pull. Second pull was to 7000 and it flatlined on power and boost after 6500. Threw a new belt on and tried again and same thing. Not sure if I have maxed out the intercooler, or maybe getting all I will get out of the stock intake. I went back and watched videos of the pulls and once it hit 22psi around 6300 it just stayed there, so not sure there was much if any belt slip.

Here are both 7000rpm pulls

some pretty good numbers for switching to auto. So you thinking of porting the stocker? Going ported short runner? Going all out like a Sullivan or other aftermarket?
I bet that power feels good
 

therealshocker

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Messages
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Location
Memphis, TN
some pretty good numbers for switching to auto. So you thinking of porting the stocker? Going ported short runner? Going all out like a Sullivan or other aftermarket?
I bet that power feels good
I'm not sure at this point. Going to work on some cosmetic things now and will circle back around to this later lol. I didn't think I would enjoy the auto as much as I do, it is a lot of fun!
 

98 Saleen Cobra

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Went back last week to try again after swapping to 1300cc injectors and a 4R70 swap, made 850/745 at 6500rpm on first full pull. Second pull was to 7000 and it flatlined on power and boost after 6500. Threw a new belt on and tried again and same thing. Not sure if I have maxed out the intercooler, or maybe getting all I will get out of the stock intake. I went back and watched videos of the pulls and once it hit 22psi around 6300 it just stayed there, so not sure there was much if any belt slip.

Here are both 7000rpm pulls

if your boost flatlined you’re either out of blower or belt slip. If boost kept climbing and intake temps were skyrocketing likely out of intercooler. Through the auto that’s a lot of power you’re likely around 950-1k to the tires on a manual depending on if you have a locked converter or not.
The boost flat lining is weird though f1a blowers can be spun hard.
Another option is your intake can’t flow any more but I know of a lot of guys making insane power on a 01 style. Personally I’d switch to a Sullivan.
 

therealshocker

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Memphis, TN
if your boost flatlined you’re either out of blower or belt slip. If boost kept climbing and intake temps were skyrocketing likely out of intercooler. Through the auto that’s a lot of power you’re likely around 950-1k to the tires on a manual depending on if you have a locked converter or not.
The boost flat lining is weird though f1a blowers can be spun hard.
Another option is your intake can’t flow any more but I know of a lot of guys making insane power on a 01 style. Personally I’d switch to a Sullivan.
That is good info, thank you. I suppose it could be belt slip. In the past when I've had slip, the boost would drop significantly. The blower should be able to make 25+ of boost with ease, so I don't think that is the issue. I have it pullied to where it doesn't reach max blower RPM until 7500rpm.

I will likely change out the intake at some point, and will take a look to see what other options I have for the belt and tensioner as it is as tight as I can get it at the moment.

The converter was locked on these pulls. As mentioned above it made 902/810 through the 6 speed. I expect I am loosing about 150whp between the blower and transmission, which is why I was leaning towards the stock intake being taxed.
 

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