Before and After Dyno of stock HR headers, HR cats, HR y-pipe on 2005 6MT Coupe
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Before and After Dyno of stock HR headers, HR cats, HR y-pipe on 2005 6MT Coupe
I had the stock HR headers, HR cats, and HR y-pipe from a 2008 350Z installed on my 2005 G35 6MT Coupe. Going into the install, I had a Z-tube, MREV2, and 5/16" iso-thermal spacer installed; other than those mods, the car was stock. I did a baseline dyno on a dynojet with these mods, the proceeded to have the HR headers, HR cats, and HR y-pipe installed. After this install, I proceeded to dyno the car again, and found that I had lost power (approx -5HP) and torque (approx -10TQ) at the low end , with slight gains (+5HP, +10TQ) in the high end. It turned out that I was running lean in the low-end (as expected), which was taken care of by the subsequent Osiris tune.
In summary:
Before install - Runfile_001 (baseline: MREV2, 5/16 spacer, ztube): 254.67HP / 246.99TQ
After install - Runfile_004 (HR headers, HR cats, HR y-pipe): 257.42HP / 241.91TQ
After a tune with everything installed - Runfile_015: 266.43HP / 254.41TQ
Do you guys think I could've achieved the tuned numbers without the HR headers, HR cats, and HR y-pipe?
In summary:
Before install - Runfile_001 (baseline: MREV2, 5/16 spacer, ztube): 254.67HP / 246.99TQ
After install - Runfile_004 (HR headers, HR cats, HR y-pipe): 257.42HP / 241.91TQ
After a tune with everything installed - Runfile_015: 266.43HP / 254.41TQ
Do you guys think I could've achieved the tuned numbers without the HR headers, HR cats, and HR y-pipe?
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yeah, the tune recouped all of the loss at the low end and added additional gain at the low end as well.
I don't think I would've done this if I didn't get the HR headers, HR cats, and HR y-pipe for dirt cheap. Since I didn't compare the tuned performance before and after the exhaust mods, I don't know what I would've gained with just the tune by itself.
To get a true delta for the headers, cats, and y-pipe, the correct sequence should've been: Tune, install headers, cats, and y-pipe, retune.
I don't think I would've done this if I didn't get the HR headers, HR cats, and HR y-pipe for dirt cheap. Since I didn't compare the tuned performance before and after the exhaust mods, I don't know what I would've gained with just the tune by itself.
To get a true delta for the headers, cats, and y-pipe, the correct sequence should've been: Tune, install headers, cats, and y-pipe, retune.