Finally tuned the T-Rex
09-25-2006, 09:57 AM
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Finally tuned the T-Rex First off I would like to say thanks to Straight-line Performance and Mike the tuner for their great work and patience for all my questions (I should note I built the car and they tuned it). The car feels stronger than ever and I can't wait for MFBA MIM to run it.
Set-up: 2002 Z28: SLP headers, custom flowmaster merge Y-Pipe with stock cat-back with QTP cut-out; MSD super conductors; TR6s at 0.040; T-Rex cam, patriot golds, CM rods; MTI lid/no filter on runs; free mods; Vara ram velocity stack(sure laugh, but see my torque numbers first); T-56, spec3 with stock flywheel; aluminum shaft; 9" with 4.56s and locker with 31 spline axles; 16 x 9 Draglite XPs with 255 BFG drag radials (48lbs each); car weighs about 3500+ with me in it.
Pulls were done on a Mustang dyno that was calibrated very recently. Weight was set at 3750 but I know it is lighter.
Max N/A was 389rwhp and 374rwtq. Average was about 385/371. For some reason the power drops off at about 6300. I will try and get the curves posted here today. I think there is some float because this cam should make power to about 6800-7k. I did not shim the valves so I will this winter and hope that was it.
Now the jug: on a 85 dry shot (dual .030 pills) it did 472.5rwhp at 4906rpm and 563.6rwtq at 3893rpm. We were amazed. I eventually want to pill it up to a 125 hit. That should put me over 500rwhp and 600rwtq on a Mustang dyno.
We really wanted to see 400 and think it will once we get it to make power up top but I am real happy with it. I will post times after the 7th. Also, for some reason the correction factor changed for the print outs than when the pull was made so the graphs are not the same exact ones as the pulls. They read a little lower.
Graphs Added
Set-up: 2002 Z28: SLP headers, custom flowmaster merge Y-Pipe with stock cat-back with QTP cut-out; MSD super conductors; TR6s at 0.040; T-Rex cam, patriot golds, CM rods; MTI lid/no filter on runs; free mods; Vara ram velocity stack(sure laugh, but see my torque numbers first); T-56, spec3 with stock flywheel; aluminum shaft; 9" with 4.56s and locker with 31 spline axles; 16 x 9 Draglite XPs with 255 BFG drag radials (48lbs each); car weighs about 3500+ with me in it.
Pulls were done on a Mustang dyno that was calibrated very recently. Weight was set at 3750 but I know it is lighter.
Max N/A was 389rwhp and 374rwtq. Average was about 385/371. For some reason the power drops off at about 6300. I will try and get the curves posted here today. I think there is some float because this cam should make power to about 6800-7k. I did not shim the valves so I will this winter and hope that was it.
Now the jug: on a 85 dry shot (dual .030 pills) it did 472.5rwhp at 4906rpm and 563.6rwtq at 3893rpm. We were amazed. I eventually want to pill it up to a 125 hit. That should put me over 500rwhp and 600rwtq on a Mustang dyno.
We really wanted to see 400 and think it will once we get it to make power up top but I am real happy with it. I will post times after the 7th. Also, for some reason the correction factor changed for the print outs than when the pull was made so the graphs are not the same exact ones as the pulls. They read a little lower.
Graphs Added
Last edited by BADSZ28; 09-25-2006 at 02:07 PM.
09-25-2006, 10:02 AM
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Mike does great work. I had a very similar set up, except mine was a autp, 3.73 gear, midlenght headers and fast 90/90. ANd on the dyno (only taken to 5k rpms) made 402rwhp.
09-25-2006, 10:08 AM
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That is great. Especially for an auto. I really think I have float. They said I would pic up 20rwhp with a 90 set-up. But I am not going that route. I may swap out the gears to 4.10s with that torque though. They were saying with 3.42s and a 10 bolt I would have done over 420 lol.
09-25-2006, 02:06 PM
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Here are the graphs. For some reason the correction factor changed from the dyno pulls to the print. On the cover sheet you can see the actuall nitrous numbers from the pull, but if you look at the graph it shows lower. It did the same for the NA pull. They are not sure why it is doing this. From left to right: NA pull, Nitrous pull, overlay and cover sheet from nitrous pull. thanks for all and any coments or sugestions.
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09-26-2006, 02:16 PM
#10
Trex's usually start to fall off around 6300rpms, it's normal...it's not valve float...Throw a FAST 90/90 on top of that and that T-rex should make power to about 6500 rpms...
