New dyno numbers after head only swap ( PRC 2.5 )
05-24-2009, 09:42 PM
#1
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New dyno numbers after head only swap ( PRC 2.5 ) I just had the car back to the dyno to see what I gained from doing a head swap. The car made 370 whp with the current cam and bolt ons. Only changes were heads ( PRC 5.3 stg 2.5 ), 30 lbs injectors and swapped the rear rims to 17x11 with 315's. Peak was 410 hp and 380 tq. Pretty happy with the results, considering it's through the exhaust, heavy rims and still on the 98 pcm. Still has a bit left in the tune. Before and after dyno sheets to show the gain. Thanks again to Jon at Texas Speed!
98 camaro ... 6 speed
PRC 5.3 stg 2.5 ( milled to 59 cc )
MLS gasket
227/228 ( 649/598 ... 111 LSA )
hardened pushrods and dual springs
Lid / SB / PP TB / LS6 intake
30 lbs injectors
Coated long tubes / off road y / hooker catback
LS6 clutch
4:10 gears
EFIlive tuned
A/F was 12.9 all the way through the band and timing was about 26 deg.
98 camaro ... 6 speed
PRC 5.3 stg 2.5 ( milled to 59 cc )
MLS gasket
227/228 ( 649/598 ... 111 LSA )
hardened pushrods and dual springs
Lid / SB / PP TB / LS6 intake
30 lbs injectors
Coated long tubes / off road y / hooker catback
LS6 clutch
4:10 gears
EFIlive tuned
A/F was 12.9 all the way through the band and timing was about 26 deg.
05-25-2009, 03:24 PM
#6
Something isn't right... You only gained 14rwtq at peak. You should be around 11.4:1 compression, I would have expected more torque than that for gaining 1.4 points of compression. Not to mention the heads are ported, I think you would have been better off with a set of stock 243's. Actually the whole torque curve looks low, it takes until 3500rpm to make 350rwtq.
Last edited by Nitroused383; 05-25-2009 at 03:32 PM.
05-25-2009, 11:00 PM
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The low run was in 3rd while the others were in 4th. I didn't get the torque I was looking for, but the tune isn't 100% yet either. After looking at my logs I was getting up to 3.5 deg of KR taking my timing down to 22 deg at some points... Still got some tuning to do...
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05-26-2009, 11:56 AM
#8
Actually he's saying the car made basically 370 before & 410 after the heads install. That's 40rwhp with a tune that is pulling timing way bellow ideal.
Good work bro, keep messing with that thing & I think you'll be able to line out the tune no problem.
Good work bro, keep messing with that thing & I think you'll be able to line out the tune no problem.
Something isn't right... You only gained 14rwtq at peak. You should be around 11.4:1 compression, I would have expected more torque than that for gaining 1.4 points of compression. Not to mention the heads are ported, I think you would have been better off with a set of stock 243's. Actually the whole torque curve looks low, it takes until 3500rpm to make 350rwtq.
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Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
06-02-2009, 09:09 AM
#10
Something isn't right... You only gained 14rwtq at peak. You should be around 11.4:1 compression, I would have expected more torque than that for gaining 1.4 points of compression. Not to mention the heads are ported, I think you would have been better off with a set of stock 243's. Actually the whole torque curve looks low, it takes until 3500rpm to make 350rwtq.
To the OP: Don't worry about the haters. It's nothing personal against you, they're only in your thread because they dislike TSP. Those are respectable gains from just a head swap (and heavier wheels).
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06-02-2009, 09:45 AM
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Pretty much what I dynod as well:
Not super great, but good enough for a set of used budget heads.
My Specs:
* LS1 Block
* T-56 Transmission
* TSP PRC 5.3L Stage 2.5 Heads (non-milled)
* TSP Torquer v2 Cam 112 LSA
* Cometic .040" Head gasket
* MSD 8.5mm wires and protective boots
* Ported Throttle Body
* 25% Udnerdrive Pulley
* JTR/Sanderson 1 7/8th Long Tube Headers
* LS6 Intake Manifold
* TSP 7.400 Pushrods
* LS7 Lifters
* LS2 Lifter Trays
* LS6 Oil Pump
* NGK TR55 plugs
* 4.10 Torsen Rear End
* Aluminum Driveshaft
* Exhaust: catless custom true dual 3" piping through Magnaflow X-pipe and 5" straight through Magnaflow mufflers
Not super great, but good enough for a set of used budget heads.
My Specs:
* LS1 Block
* T-56 Transmission
* TSP PRC 5.3L Stage 2.5 Heads (non-milled)
* TSP Torquer v2 Cam 112 LSA
* Cometic .040" Head gasket
* MSD 8.5mm wires and protective boots
* Ported Throttle Body
* 25% Udnerdrive Pulley
* JTR/Sanderson 1 7/8th Long Tube Headers
* LS6 Intake Manifold
* TSP 7.400 Pushrods
* LS7 Lifters
* LS2 Lifter Trays
* LS6 Oil Pump
* NGK TR55 plugs
* 4.10 Torsen Rear End
* Aluminum Driveshaft
* Exhaust: catless custom true dual 3" piping through Magnaflow X-pipe and 5" straight through Magnaflow mufflers
Last edited by Aaron1017; 06-03-2009 at 10:16 AM.
06-02-2009, 10:02 AM
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Maybe you missed where on the before graphs it didn't make 350ftlbs until 3500rpm (or a little later)?
To the OP: Don't worry about the haters. It's nothing personal against you, they're only in your thread because they dislike TSP. Those are respectable gains from just a head swap (and heavier wheels).
To the OP: Don't worry about the haters. It's nothing personal against you, they're only in your thread because they dislike TSP. Those are respectable gains from just a head swap (and heavier wheels).
06-02-2009, 02:10 PM
#13
I just had the car back to the dyno to see what I gained from doing a head swap. The car made 370 whp with the current cam and bolt ons. Only changes were heads ( PRC 5.3 stg 2.5 ), 30 lbs injectors and swapped the rear rims to 17x11 with 315's. Peak was 410 hp and 380 tq. Pretty happy with the results, considering it's through the exhaust, heavy rims and still on the 98 pcm. Still has a bit left in the tune. Before and after dyno sheets to show the gain. Thanks again to Jon at Texas Speed!
98 camaro ... 6 speed
PRC 5.3 stg 2.5 ( milled to 59 cc )
MLS gasket
227/228 ( 649/598 ... 111 LSA )
hardened pushrods and dual springs
Lid / SB / PP TB / LS6 intake
30 lbs injectors
Coated long tubes / off road y / hooker catback
LS6 clutch
4:10 gears
EFIlive tuned
A/F was 12.9 all the way through the band and timing was about 26 deg.
98 camaro ... 6 speed
PRC 5.3 stg 2.5 ( milled to 59 cc )
MLS gasket
227/228 ( 649/598 ... 111 LSA )
hardened pushrods and dual springs
Lid / SB / PP TB / LS6 intake
30 lbs injectors
Coated long tubes / off road y / hooker catback
LS6 clutch
4:10 gears
EFIlive tuned
A/F was 12.9 all the way through the band and timing was about 26 deg.
Last edited by Abdullah; 06-02-2009 at 02:35 PM.
06-02-2009, 02:59 PM
#14
Looks like your peak hp holds out pretty strong up top, good for high RPM racing. 
And we make almost the exact same numbers: 408/380 here with a 224/228 581/588 113 LSA and $900/pair Patriot heads, although mine is through a very heavy drivetrain and same steep gearing (12-bolt, 4.10s, MN12 trans, 3.5" driveshaft, also 17" wheels).
And we make almost the exact same numbers: 408/380 here with a 224/228 581/588 113 LSA and $900/pair Patriot heads, although mine is through a very heavy drivetrain and same steep gearing (12-bolt, 4.10s, MN12 trans, 3.5" driveshaft, also 17" wheels).
06-02-2009, 09:27 PM
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Maybe you missed where on the before graphs it didn't make 350ftlbs until 3500rpm (or a little later)?
To the OP: Don't worry about the haters. It's nothing personal against you, they're only in your thread because they dislike TSP. Those are respectable gains from just a head swap (and heavier wheels).
To the OP: Don't worry about the haters. It's nothing personal against you, they're only in your thread because they dislike TSP. Those are respectable gains from just a head swap (and heavier wheels).
I would love to see those two graphs overlayed, it doesn't really look like it picked up much at all down low. Matter fact just from comparing the graphs side by side it looks like the news heads only start pulling hard at or just above 4500rpm.
Last edited by willyfastz; 06-02-2009 at 09:45 PM.
06-02-2009, 09:54 PM
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Matt, why must you call every person that questions a TSP package a "hater"?
I would love to see those two graphs overlayed, it doesn't really look like it picked up much at all down low. Matter fact just from comparing the graphs side by side it looks like the news heads only start pulling hard at or just above 4500rpm.
I would love to see those two graphs overlayed, it doesn't really look like it picked up much at all down low. Matter fact just from comparing the graphs side by side it looks like the news heads only start pulling hard at or just above 4500rpm.
06-02-2009, 10:06 PM
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Like I said, I would love to see the graphs over layed. Most head swap only deals pick up from start to finish. Yeah the heads picked up power but why only from 4500 rpm up?
06-02-2009, 10:32 PM
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Overall I am happy with the results. I didn't expect to swap a pair of "budget" heads, add heavier wheels and pick up 70-80 rwhp... Their site claimed 50 rwhp over stock and I picked up 40 whp with a heavier tire through 4:10's. Again, the tune is by no means 100% and the cam isn't the most aggressive. With a ported fast 90/90 set up, UD pulley and duals, I could see 435-450 whp, which would be right in line with this set up.
06-03-2009, 04:00 AM
#20
Maybe you missed where on the before graphs it didn't make 350ftlbs until 3500rpm (or a little later)?
To the OP: Don't worry about the haters. It's nothing personal against you, they're only in your thread because they dislike TSP. Those are respectable gains from just a head swap (and heavier wheels).
To the OP: Don't worry about the haters. It's nothing personal against you, they're only in your thread because they dislike TSP. Those are respectable gains from just a head swap (and heavier wheels).