233/239 Results & Question
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From: Victoria, TX
233/239 Results & Question Ok, first I'll list my mods and then we'll get to the numbers.
2001 A4
Finish Line Performance LT Headers
3" X pipe w/ spintech twister muffs dumped
ASP Pulley
Home Ported Throttle Body
Whisper Lid
Smooth Bellow
TCI SSF 3500
3.73 Gears
Stock LS6 Intake
Stock Water Pump
Stock 241 Heads
Baseline Bolt on #'s with HPP3 tune
345 rwhp / 452 rwtq (locked)
323 rwhp / 339 rwtq (unlocked)
Dyno Tuned by HPE w/ 27 deg timing A/F pretty much flat @ 13:1.
400.6 rwhp / 352.3 rwtq (locked)
381.6 rwhp / 322 rwtq (unlocked)
All numbers are SAE corrected.
Now obviously I'm happy with the HP #'s but what the hell is up with that torque. There was another thread w/ similar results and everyone was saying it was the tune. It appears that it may not be a tuning issue.... My torque is peaking at 5000 rpm, and the hp is peaking at 6500. This is peaking a LOT higher than I was expecing. I was hoping my shift points would be at 6400 or 6500 and I'd be making peak power at 6100.
On a positive note the cam feels strong. Hopefully I'll get some track results pretty soon. I'll try to post up some graphs soon. Another positve note this cam sounds absolutley evil through my duals, even tuned idling at 850 rpm. I've got video clips if someone wants to host, let me know.
2001 A4
Finish Line Performance LT Headers
3" X pipe w/ spintech twister muffs dumped
ASP Pulley
Home Ported Throttle Body
Whisper Lid
Smooth Bellow
TCI SSF 3500
3.73 Gears
Stock LS6 Intake
Stock Water Pump
Stock 241 Heads
Baseline Bolt on #'s with HPP3 tune
345 rwhp / 452 rwtq (locked)
323 rwhp / 339 rwtq (unlocked)
Dyno Tuned by HPE w/ 27 deg timing A/F pretty much flat @ 13:1.
400.6 rwhp / 352.3 rwtq (locked)
381.6 rwhp / 322 rwtq (unlocked)
All numbers are SAE corrected.
Now obviously I'm happy with the HP #'s but what the hell is up with that torque. There was another thread w/ similar results and everyone was saying it was the tune. It appears that it may not be a tuning issue.... My torque is peaking at 5000 rpm, and the hp is peaking at 6500. This is peaking a LOT higher than I was expecing. I was hoping my shift points would be at 6400 or 6500 and I'd be making peak power at 6100.
On a positive note the cam feels strong. Hopefully I'll get some track results pretty soon. I'll try to post up some graphs soon. Another positve note this cam sounds absolutley evil through my duals, even tuned idling at 850 rpm. I've got video clips if someone wants to host, let me know.
Last edited by calongo_SS; Feb 23, 2005 at 10:57 AM.
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From: Victoria, TX
Here's some graphs.
Ok, here's the story on the graphs.
The first one is in mph for some reason, and has a locked (blue) and unlocked run (red). Unlocked run was shut down a little early. Second graph is of the same run in RPM, but for some reason the locked run data does not show up all the way (stops at 6k). The third graph is on a mustang dyno which HPE uses to tune. I just posted it for the A/F ratio. FYI it did 360 rwhp unlocked on the mustang dyno only pulling to 6400.
Let me know if the pics are a too shitty and I'll try to take some better ones. We're pretty limited on attachment size.
Ok, here's the story on the graphs.
The first one is in mph for some reason, and has a locked (blue) and unlocked run (red). Unlocked run was shut down a little early. Second graph is of the same run in RPM, but for some reason the locked run data does not show up all the way (stops at 6k). The third graph is on a mustang dyno which HPE uses to tune. I just posted it for the A/F ratio. FYI it did 360 rwhp unlocked on the mustang dyno only pulling to 6400.
Let me know if the pics are a too shitty and I'll try to take some better ones. We're pretty limited on attachment size.
seems like you picked the wrong cam for your intended powerband. great HP curve 
for a cam only stalled a4, my opinion on the 233/239 torque or lack there of has been stated before.
when you gonna hit up the track?
for a cam only stalled a4, my opinion on the 233/239 torque or lack there of has been stated before. when you gonna hit up the track?
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From: Victoria, TX
I could be hitting the track as soon as next weekend. I'm trying to get a hold of some MT drag radials before I go, but the 275/40 R17 are on perpetual back order. I'll probably try my crappy Kuhmo's again, as I'm anxious to test it out. I'm thinking I'm prabably going to be a little bit understalled (Shift Extension = 5k) with the way the power curve came out.
But thanks jrp, the HP curve does look pretty fat. And even though the torque is pretty low, it doesnt completly fall off, still above 300 at 6500 rpm.
But thanks jrp, the HP curve does look pretty fat. And even though the torque is pretty low, it doesnt completly fall off, still above 300 at 6500 rpm.
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Originally Posted by Master Chief
that was on a mustang dyno??
Thread Starter
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From: Victoria, TX
Originally Posted by Master Chief
that was on a mustang dyno??
TECH Enthusiast
Joined: Dec 2003
Posts: 647
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From: Amarillo Texas
I have that cam and am very pleased so far, I havent broke the motor in competly yet so i cant really jump on it, but i did lay 441rwhp and 423rwtq without spray! I am wanting to get a mid to low 11 here were im at. That is 5500ft elevation.
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I just took the car out for some spirited driving. I was pretty concerned with the lack of torque, but that is all gone now. The car pulls like a raped ape on the top end. Think I need about a 4000 rpm stall now and I'll have a pretty good combo.
Originally Posted by calongo_SS
I just took the car out for some spirited driving. I was pretty concerned with the lack of torque, but that is all gone now. The car pulls like a raped ape on the top end. Think I need about a 4000 rpm stall now and I'll have a pretty good combo.
For comparison mine did 398 RWHP/357 RWTQ w/o a ported TB or pulley and while running over 14:1 AFR. You're right about the torque still being above 300 at 6500 rpms however it sucks down low. I'm running a fattened up tune now to fix the AFR but have no new dyno numbers.
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From: Australia
Price you pay for a "big sexy cam".
The fact you dont make as much TQ down low with a cam probably means you are holding onto it longer. That means in the upper RPM register you will have more TQ. Since HP is a function of TQ at RPM, the higher the HP at higher RPM the more average TQ you have once off the line. This is consistent with your rather large HP peak at 6500RPM and max. TQ at 5000RPM.
Now you need to balance your gearing and converter. 4000 stall sounds perfect and I would recommend 3.91 gears shifting at 7000RPM in 1st, 6700RPM in 2nd and 3rd. That is, if your car can take it.
The fact you dont make as much TQ down low with a cam probably means you are holding onto it longer. That means in the upper RPM register you will have more TQ. Since HP is a function of TQ at RPM, the higher the HP at higher RPM the more average TQ you have once off the line. This is consistent with your rather large HP peak at 6500RPM and max. TQ at 5000RPM.
Now you need to balance your gearing and converter. 4000 stall sounds perfect and I would recommend 3.91 gears shifting at 7000RPM in 1st, 6700RPM in 2nd and 3rd. That is, if your car can take it.
It looks to me the 233/239 cam doesn't seem to be much better than the 231/237 which is tried and true. However the stock heads might be holding it back. Even a pair of stage 1 LS1 heads would really wake that cam up across the board.
Jason
Jason
Originally Posted by Camaro99SS
It looks to me the 233/239 cam doesn't seem to be much better than the 231/237 which is tried and true. However the stock heads might be holding it back. Even a pair of stage 1 LS1 heads would really wake that cam up across the board.
Jason
Jason
thats the plan
stage II 5.3's