Ashley-starlet Posted January 17, 2013 Share Posted January 17, 2013 (edited) My car has an uprated system.. And when I say it's uprated.. It is! Turbo mani, heat wrapped down pipe, Decat replaced with silencer, gixer 650 can and the overall diameter of the pipe through.. 2 inch? 2.5 inch maybe? Try 3-3.5 inch! You could stick a child's head in it.. All customed made around the can buy the looks from silencer back..Oh, and it's not even turboed! So my question.. Is this helping acceleration, or not? Simple as that, it's an sr, it's got shit loads of little mods, filters breathers rolla mani and the exhaust stuff.. Remap is inkown probably not, But don't feel as quick as my ergh ermm.. Standard sportif ( cherry bomb back box and air filter ok ) any help? I no weight plays and wheel size but really? That bad! Thanks in advance if you could be bovered to read all this lol Edited January 17, 2013 by Ashley-starlet Quote Link to post Share on other sites
_shaun_ Posted January 17, 2013 Share Posted January 17, 2013 (edited) my understanding was on a n/a a massive exhaust would lose you power as it would give next to no exhaust velocity. on a n/a u want to keep some exhaust velocity cant think how to describe it but bascily the exhaust creates a vacuum which actualy helps to remove the gasses from the head. although am not sure how i came across this piece of information so i might have been miss informed lol Edited January 17, 2013 by _shaun_ Quote Link to post Share on other sites
Fozzie Posted January 17, 2013 Share Posted January 17, 2013 (edited) ^ I've heard that too, but again I'm not sure where from lol.I think with an n/a you want some back pressure to help draw gasses out of the engine. With a turbo you want low back pressure, as the turbo is already forcing gasses through and you want to minimise the resistance.I'm no expert but I think that's roughly how it goes? Edited January 17, 2013 by uberphil88 Quote Link to post Share on other sites
Ashley-starlet Posted January 17, 2013 Author Share Posted January 17, 2013 (edited) Yep that's right as the piston is closing on the exhaust side is causes gas build up due to the exhaust length trapped gasses in silencers etc so the new mixture can be more beneficial. Eg a gun shot. The barrel causes the "impact pressure" if you like but the actual explosion causes the power.. Same with the exhaust and combustion. Does anyone know what size is best for the exhaust? J think its 2 inch downpipe tk a 3 after silencers and possibly 3.5 tail end to gixer can on my car now Edited January 17, 2013 by Ashley-starlet Quote Link to post Share on other sites
Amjad Posted January 17, 2013 Share Posted January 17, 2013 LOL people with Turbo's rarely have 3" exhausts! My 2" system works nicely on my NA Quote Link to post Share on other sites
Driver Posted January 17, 2013 Share Posted January 17, 2013 With a turbo you want the least restriction as possible so 3" would be a massive benefit however on a 1.3 N/A I would say even 2" would be on the upper scale. 1.75" would be preferable under 100ft/lb Are you sure the full system is 3-3.5" and not just the exit to the box ? Either way if you really want to waste time trying to gain decent power from an N/A 1.3 then I really wouldn't go any bigger than 1.75" Quote Link to post Share on other sites
Ashley-starlet Posted January 18, 2013 Author Share Posted January 18, 2013 LOL people with Turbo's rarely have 3" exhausts! My 2" system works nicely on my NAI no man the person that owned it before me must of been a nut! I will be taking my exhaust of other starlet and comparing I shall let everyone know how it goes .Driver.. Your comment is invalid for I'm apparently wasting time with my car.. This is also killing my fuel.. So it's not just performance.. Thanks anyway Quote Link to post Share on other sites
Driver Posted January 18, 2013 Share Posted January 18, 2013 Driver.. Your comment is invalid for I'm apparently wasting time with my car.. This is also killing my fuel.. So it's not just performance.. Thanks anyway In your original post all you mention is "Is this helping acceleration, or not? Simple as that" so forgive me for thinking your only reason for asking is for performance, simple as that. Quote Link to post Share on other sites
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