Quote:
Originally Posted by sixspeeddemon
I'm not disagreeing with anyone but I think some of you are thinking of just bolt on and going. I was saying with the combo of LTH and retune should net about 10whp. And I also said every car is different but honestly if it in all seriousness made 2-4whp why would someone spend 900-1500 for LTH plus install if they can't do it themselves for 4whp. LTH 99.9% outperform shorty any day. I agree with the bolt on might gain 5whp with a retune i don't see why it wouldn't or why it couldn't pick up 10whp over the hfc. On my civic I had i had LTH with Hfc when I switched to a better flowing LTH without cats my car gained 7whp without tuned and another 4whp with a tune. So it possible it's really all in the tune. I do agree that when it comes to NA build its harder to make big whp gains after the basic bolt ons are there but people tend to figure that the flow rate of you intake and exhaust systems plays a huge roll on power the better the flow the better. But I'm glad we have a better tuning software now as well that alone can help make power by itself
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I think you're tossing around apples and oranges.
I had a b20 vtec, ITB'd civic myself in the past, and a small change, retune, or better bolt on absolutely delivered a measurable difference in whp.
The VQ is not that animal. Its not a B or K series, its not an LS, its not a coyote 5.0
The VQ in these cars is already towards the end of its efficiency, and they absolutely see diminishing returns with bolt ons. I would personally never even bother getting headers for this car, short or LT. It's not personally worthwhile for the cost for the return. I'm aware that most of the header products available are "off the shelf" and not a completely custom, refined for 15 years piece like a Hytech, or RMR or whatever is out there for other platforms. Sure a shop like a Hytech could slave over a set of headers to extract every drop of HP out of the VQ, but they would retail for an enormous amount of money when they were done.