i posted a thread before about the invidia header/upipe combo.. but people were telling me you can loss power from putting aftermarket headers with the stock turbo still on the car.. so one of my friends is selling stock wrx headers that are ported and polished for 100$ if i put those on will i still loose power. im also putting an hks uppipe on.
Wrong wrong wrong. This is a rumor started by someone who installed headers and did`nt tune for it. There are dyno sheets over on nasioc that prove not only that they make power (when tuned for) , but they also try out a couple different setups and headers. I think if you search "headers" you will find what I`m talkin about. So to answer your question if you plan on tuning for them then I would talk to your tuner and plan your setup.
Equal length headers will make more power period.Especially in the midrange.If you know how to really read a dyno chart and understand that peak #'s aren't everything you'll see why they can be a nice moddification. http://forums.nasioc.com/forums/show...ghlight=header
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Aarg matey!
ECU Pirated by RomRaider
yes, with headers (especially equal length) your power will go up, not down. however, lag will increase as well. with port and polished stock headers, you'll gain a little power up top AND down low.
Equal length headers will make more power period.Especially in the midrange.If you know how to really read a dyno chart and understand that peak #'s aren't everything you'll see why they can be a nice moddification. http://forums.nasioc.com/forums/show...ghlight=header
Dumdum, thanks for backing me up on this one. It also seems that you would benefit more from headers if you had a bigger turbo. As far as stock p&p, and a tune, I would wrap em good. There is also a good write up on this over at nasioc.............(DUMDUM?)
yes, with headers (especially equal length) your power will go up, not down. however, lag will increase as well. with port and polished stock headers, you'll gain a little power up top AND down low.
I am seeing 200-300rpm sooner spool time with my GP Moto equal length(coated and wrapped) over my polished/ported/ceramic coated stockers with Injen cross-pipe AFTER i retuned for the header.If you compare unequal non wrapped and coated to P&Ped stockers you will see an increase of spool time.Wrapping makes a world of difference and so does readjusting wastegate duty cycles.
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Aarg matey!
ECU Pirated by RomRaider
those dyno charts on nasonic are from an STi which has more turbo (and more motor in this case) to take advantage of the flow. I agree equal length headers give gains but if you have a stock TD04, you're not going to see much gain from other, boxier, setups. Wrapping always helps, but you don't need to get pipes to do that.
those dyno charts on nasonic are from an STi which has more turbo (and more motor in this case) to take advantage of the flow. I agree equal length headers give gains but if you have a stock TD04, you're not going to see much gain from other, boxier, setups. Wrapping always helps, but you don't need to get pipes to do that.
True, but for $100 he can wrap those with almost no down time to his car and the sell his stockers or practice his porting skills.
Might as well get a biggger turbo since your at it
those dyno charts on nasonic are from an STi which has more turbo (and more motor in this case) to take advantage of the flow. I agree equal length headers give gains but if you have a stock TD04, you're not going to see much gain from other, boxier, setups.
Not so at all.An equal lenght header has some to do with flow and some to do with pulsing exhaust gas energy.Also its about chosing a header with the proper primaries (and up-pipe diameter) for your application.Not all are the same.
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Aarg matey!
ECU Pirated by RomRaider
Not so at all.An equal lenght header has some to do with flow and some to do with pulsing exhaust gas energy.Also its about chosing a header with the proper primaries (and up-pipe diameter) for your application.Not all are the same.
YUP!
That is kind of the point I was trying to make in the beginning, is that a person will slap a set of Brand A headers on X setup and blast them online when they have more lag and less power when they were the ones responsible for not doing there homework first! Headers work!
YUP!
That is kind of the point I was trying to make in the beginning, is that a person will slap a set of Brand A headers on X setup and blast them online when they have more lag and less power when they were the ones responsible for not doing there homework first! Headers work!
Yup!It's way old technology.Turbo headers work the same way N/A headers do.Everyone is so hot about twin scroll turbos Same concept as equal length headers.In fact the idea for twin scroll turbos came from the scavenger effect and design of equal length headers on old school V8's.The Subaru stock exhaust system design is horrible,as most are.Its totally biased to the passenger side.
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Aarg matey!
ECU Pirated by RomRaider
Yup!It's way old technology.Turbo headers work the same way N/A headers do.Everyone is so hot about twin scroll turbos Same concept as equal length headers.In fact the idea for twin scroll turbos came from the scavenger effect and design of equal length headers on old school V8's.The Subaru stock exhaust system design is horrible,as most are.Its totally biased to the passenger side.
That`s mass production for ya.
Wham -bam-thank you, mam
Besides that what we do. CUSTOMIZE.
It`s funny you say all that because I had to explain today to my cousins boyfriend , who is a supposed gearhead, and owns a camaro SS , I think it`s a 2002. Anyway , I had to explain to him how he could cheaply squeeze some more power from his ride by wrapping his headers (they come stock with actual scavenging headers) and doing a little P&P work.
I'm going to go ahead and resurrect this thread because I am currently trying to decide whether I'll be putting my equal length invidia headers back on when I'm done, or if I want to put them up for trade and get a stock set then get them P&P'd. How does one choose the right set? I will be getting a pro-tune as soon as my engine is broken in, so either way I can tune for it.
Also, would I benefeit from a P&P job on the headers I have, or do most aftermarket sets come ported?
Same concept as equal length headers.In fact the idea for twin scroll turbos came from the scavenger effect and design of equal length headers on old school V8's.The Subaru stock exhaust system design is horrible,as most are.Its totally biased to the passenger side.
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