i think the tracy sports header ur talking abt it is the prototype tracy sports header which has proven to make alot of power.

do u have a dyno of the amuse header? i never saw one on here

 

I'm not referring to the prototype. The tracy sports header you can get anywhere has shown very strong power gain. 5-8hp untuned with AFRs of 12. Lots of room there for tuning to show gains. 15 peak hp not by any means impossible with the header.

 

Quick question. If a header flows better than stock, wouldn't the tendency be a leaner-than-before AF ratio? If one put a free-flowing header on and still was running that rich(12:1), that would have been a horrific tune to begin with, no?

 

 

Was on stock ECU...

Ultimately the only way to tell is to do back to back tuned, other than that it is somewhat speculation.

Based on what I have seen, I would give the Tracy Sports, J's, Toda, Mugen 2.2L and Hytech a green light. Could you spend the same money somewhere else for better results? Perhaps, but if you are set on a header the above have all prove decent results.

 

Oh, ok. So it was tuned. When you said untuned, I automatically assumed aftermarket ecu.

 

It was untuned after the header and tuned before. Stock ECU before and after the header.

 

Seriously, I am confused. How can that be? If the header is less restrictive and the ecu did not have time to relearn, why would the AF ratio go richer? It would still think it had more restriction, hence less fuel.

I'd also wonder why the stock ecu wasn't reset prior to the "after" runs.

 

Unfortunelty, I can't give you any more insight. Prima facie you make a good argument, but there may be some hidden complexity here that makes it hard to draw firm conclusions.

I would love to have a back to back header shootout with the 5-7 most popular performance headers, but it makes no sense economically for one person to do the testing the absolute right way so we end up piecing things together from lots of disparate data and forming opinions which can't be directly supported and hence can easily be attacked. So for anyone else reading, this is one person's opinion based on lots of disparate data, take it for what it's worth.

 

I don't know everything, and most of what I do know I learned on here or by doing myself on the S2000. I appreciate your insight.