Quote:
Originally Posted by Lantanafrs2
Can you dyno it upside down and maybe under water as well?
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https://www.ft86club.com/forums/showthread.php?t=130992
Your joke sounds cynical, so I’ll explain:
Conventional thinking is that it isn’t great to run a header without a tune. Some will because this dyno session shows gains, but there might be an O2 sensor CEL, and it might not be good under conditions where the car isn’t at WOT. The fact that it shows great gains without a tune is promising.
With some manufacturers, they jump from a stock car and stock tune to headers and a custom tune, claiming big gains with the headers, but it was mostly the tune, and this is apparent after someone dynos their car with an aftermarket tune on stock headers. Those gains sometimes diminish further when someone does E85 and compares that to headers on pump gas or even with headers on E85. It is also nice to see with a catless frontpipe and with FI, but we are obviously limited in what can be done now. It can be pretty disappointing bench racing with mods only to realize on the dyno the mod gains weren’t additive. Some people may want to optimize the gains for the price. A frontpipe is typically cheaper than headers, so a frontpipe could be the better buy to eliminate one cat, which might provide most of the gains to be had, or maybe not.