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There was a mobile dyno in town last Saturday (4/20/13) at the Pepboys Car Show so I put my car on. The car's only performance changes are: Mac longtubes, Mac ProChamber, Bassani Race mufflers, and 4.10 gears.
The car was dynoed with just 4.10 gears and 87 octane last year (4/21/12) to get a baseline. Stock numbers were 270 RWHP and 292 RWTQ. Dyno below:
It was then dyno'ed with the above mentioned parts installed and 87 octane again. With exhaust, numbers were 283 RWHP and 296 RWTQ. Dyno below:
Below is a table of the changes in performance. I made a mistake in the most recent dyno in not having them start at the same RPM so the data is not as accurate as it could be but, the basic story is yes, I lost some low end torque but were the runs to start at the same time, I would expect it to be single or low double digit losses (not 31% as pictured).
I picked up peak gains of 13rwhp and 4rwtq. Non-peak max gains were 13rwhp and 13rwtq. The average was 3% gain in power across the rpm band from 2,600 to 6,100 rpms.
Because I didn't ask for the run file from last year (and the shop hasn't sent it to me, only a screen print of the run) I used excel to plot the data so you can see an over lay:
I knew that most of us knew that a full exhaust isn't going to post major gains by itself but it is a building block for a stronger car. Before now, I never could find a dyno on just these parts (mostly because it just isn't very cost efficient to do a dyno after each round of mods) but here is the proof I was waiting for. So for all of you in the future, you should be able to better determine where to spend money and what to expect from it. Using a 91-93 octane tune would have likely netted me another 5rwhp and 5rwtq but I just remembered that I didn't even think to switch it (although not sure how great a canned 93 tune would have been).
The next round will be Steeda Charge Motion Delete Plates, Steeda Under Drive Pulleys, WMS High Velocity Intake, and an 87 and 93 octane tune.
Finally got my performance parts installed and a dyno tune today. Mods are Western Motorsports High Velocity Intake, port and polished throttle body, Steeda charge motion delete plates and under drive pulleys, MAC long tube (mid-length) headers, off-road MAC ProChamber, Bassani Race AB's, and 4.10 gears tuned by Performance Evolution on 93.
Base dyno on 4.10 gears only was 270 RWHP and 293 RWTQ
New dyno with above mods was 330 RWHP and 336 RWTQ
By the numbers from 2,530 to 6,020 RPM
Peak gains by RPM (not overall peak) were 65.6 RWHP and 57 RWTQ
Average gains were 37.3 RWHP and 43.8 RWTQ
Minimum gains 13.6 RWHP and 26 RWTQ
Was hoping for 325 RWHP and 330 RWTQ. I am very happy with the results.
Other mods include Steeda chromoly tubular radiator support, Eibach Pro springs, Eibach camber bolts, Eibach rear lower control arms, ProThane, bullet motor mounts, ProThane full car bushing kit, ProThane front upper control arm mounts, American Muscle strut tower brace, Carriage House Engineering A-Arm brace with torque limiters, AMR 18 x 9"/10" wheels, Nitto 555 275/40-18's, JLT oil separator, SCT iTSX tuner, Webelectric sequential tail lights, DG Customs front billet grille with hidden fog light kit, Cervinis side scoops, and GT500 cloth top.
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