Progression of mods - Dyno graphs
#1
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I finally dyno'ed my new setup today which consists of an RR-Racing intake, RR-Racing tune, PPE headers, Joe Z exhaust, and no cats. This was on a Dynojet 248C and all runs were done in 6th gear. Runfile4 represents these mods below. On this graph you will also find my best numbers for each progression of modification.
Michael.001 - Stock
Michael.003 - Joe Z exhaust
Michael.005 - Joe Z exhaust, PPE catless headers
RunFile_004 - RR-Racing Intake, RR-Racing Tune, PPE catless headers, and Joe Z exhaust.
The car has picked up power with each round of modification(you determine if the increase is worth it) and I thought some might find this interesting. All runs done on the same dyno in 6th gear, separated by about a year each. Not back to back, but about the best normal people can do.
Michael.001 - Stock
Michael.003 - Joe Z exhaust
Michael.005 - Joe Z exhaust, PPE catless headers
RunFile_004 - RR-Racing Intake, RR-Racing Tune, PPE catless headers, and Joe Z exhaust.
The car has picked up power with each round of modification(you determine if the increase is worth it) and I thought some might find this interesting. All runs done on the same dyno in 6th gear, separated by about a year each. Not back to back, but about the best normal people can do.
![](https://c4.staticflickr.com/1/670/31649646835_ac148f444d_h.jpg)
Last edited by fstpassat; 12-14-16 at 03:25 PM.
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#4
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The Joe Z exhaust didn't make more power than headers. Look at the graph again - 383whp vs 397whp, 356wtq vs 376wtq. The higher numbers are with PPE headers.
Yes, I have the RR-Racing tuned intake.
Yes, I have the RR-Racing tuned intake.
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Hey all,
fstpassat, Thank you for sharing your dyno results.
I think it is important to note that the dyno results posted with our tuned intake were performed with the intake box closed. We recommend opening the intake box lid, and directly cool air at the air filter.
The stock intake box has a flapper door that opens and pulls in cool air when the hood is open on the dyno. Our airbox relies on sufficient airflow to the front of the car, and you simply cannot achieve that kind of airflow on a dyno, so you have to open the lid when dynoing.
So I am willing to bet that the actual intake air temps on this dyno run were 30-50F above ambient, particularly at the higher RPM's where you hit peak power, and especially since these were long runs performed in 6th gear. That can easily contribute to a 15-20hp drop in power. This drop in power is not real, because in the real world, intake air temps with our intake above 30mph are within 10F of the ambient air temp.
Bottom line is that if you really want to compare dyno runs, logging IAT is important.
-Rafi
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Last edited by RRRacing; 12-15-16 at 06:43 AM.
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