Luke350 Posted February 15, 2016 Share Posted February 15, 2016 Hi all. Been talking to chris at Tarmac. He's been fantastic with advice and speedy replies. Couldn't recommend enough. I'm looking at an invidia gemini cat back system and cobra/berk HFCs and then mapping at TDI North. 2 questions I've been told plenum spacer isn't required as mine is a HR. And headers aren't worth the money. Is this true? Can anybody think of anything else I should do before taking to TDI for the map? Don't want to miss anything before mapping. Thanks guys. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
coldel Posted February 15, 2016 Share Posted February 15, 2016 Headers are meant to be good, but are a lot of effort to install from what i understand... 1 Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 15, 2016 Share Posted February 15, 2016 Pair of Cosworth air filters too, if you don't have them already. Quote Link to comment Share on other sites More sharing options...
chirag1988 Posted February 15, 2016 Share Posted February 15, 2016 Or HKS panel filters too Quote Link to comment Share on other sites More sharing options...
BobbyZ Posted February 15, 2016 Share Posted February 15, 2016 That's correct regarding the plenum spacer. Nissan fixed that with the HR I think the thing with headers is that they're a ball ache to fit, like coldel said. You will see a power gain from what I've read (and it'll change / improve the sound). Only you can decide if it's worth the cash - lots of people would say any modification is a waste of money Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 15, 2016 Share Posted February 15, 2016 Manifolds (US = headers) They are already good in the HR - just have a look at the design, it's us lot with the DE that have not so good ones. It's one of those jobs that'll take at least 5hrs (most say 8), so it'll be easier having the engine out and doing other stuff at the same time if you have the time/cash/patience. (on the bottom) Basically you're asking about 'bolt on' upgrades rather than getting into the guts of it right ? 1 Quote Link to comment Share on other sites More sharing options...
BobbyZ Posted February 15, 2016 Share Posted February 15, 2016 Manifolds (US = headers) I used to know them as manifolds, but it seems like everyone calls them headers now. I guess times have changed 4 Quote Link to comment Share on other sites More sharing options...
Richf Posted February 15, 2016 Share Posted February 15, 2016 The term "manifolds" generally relates to a standard cast iron item the term "headers" refers to the performance related upgrade item usually made from tubular steel 3 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 15, 2016 Share Posted February 15, 2016 Good to know Rich, it still seems like an Americanism. Either way - it's those bendy bits that come out of the engine & you can see that the HR design is already pretty good, so I personally wouldn't change them unless you are putting a fully designed system in or trying to change the sound perhaps ? (if you do, I'll buy your HR bendy bits)/ Quote Link to comment Share on other sites More sharing options...
Kaveney Posted February 15, 2016 Share Posted February 15, 2016 From changing the stock headers on my 2005 DE I gained the below but this is bang on what I was expecting . + 6 BHP and + 5.5 LB/FT 2 Quote Link to comment Share on other sites More sharing options...
Luke350 Posted February 15, 2016 Author Share Posted February 15, 2016 Some great replies. Thanks very much. Very much appreciated. Yes getting panel filters. Not sure on k&n or cosworth but from other threads I've seen its a toss of a coin. Unless people would suggest one or the other? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 15, 2016 Share Posted February 15, 2016 I've got a green one and give it a wash in Surfex HD every 6 months (I think it's a Cossy) Quote Link to comment Share on other sites More sharing options...
Pritchard Posted February 15, 2016 Share Posted February 15, 2016 From changing the stock headers on my 2005 DE I gained the below but this is bang on what I was expecting . + 6 BHP and + 5.5 LB/FT wy have i not seen this dyno before? it doesnt come up in searches. good job on the before / after dyno. which brand of manifold was this one? cheers (yea i also use manifold if im on Uk forums, headers in US. but i think Jez is actually accurate ) Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 15, 2016 Share Posted February 15, 2016 (edited) which brand of manifold was this one? Worth searching on the US forums - but one thing which should be obvious - stick to a very high quality brand and material. The last thing you want is the bugger cracking As I'm on the DE engine rather than the op's HR, I'm going with Tomei or HR bendy bits. (or PPE Long tubes if feeling a bit flush - which is never basically) Edited February 15, 2016 by RobPhoboS Quote Link to comment Share on other sites More sharing options...
HaydnH Posted February 15, 2016 Share Posted February 15, 2016 I've got a green one and give it a wash in Surfex HD every 6 months (I think it's a Cossy) I thought the cosworth ones were blue? The HKS ones are green. 1 Quote Link to comment Share on other sites More sharing options...
Kaveney Posted February 15, 2016 Share Posted February 15, 2016 From changing the stock headers on my 2005 DE I gained the below but this is bang on what I was expecting . + 6 BHP and + 5.5 LB/FT wy have i not seen this dyno before? it doesnt come up in searches. They are the DC sport ones in S/S . Regards Alan good job on the before / after dyno. which brand of manifold was this one? cheers (yea i also use manifold if im on Uk forums, headers in US. but i think Jez is actually accurate ) Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 15, 2016 Share Posted February 15, 2016 I've got a green one and give it a wash in Surfex HD every 6 months (I think it's a Cossy) I thought the cosworth ones were blue? The HKS ones are green. I think you're right Quote Link to comment Share on other sites More sharing options...
coldel Posted February 15, 2016 Share Posted February 15, 2016 There are lots of filters which are green from different companies - google HKS panel filter and look at the plastic cage that holds the filter, its quite distinct and will give you an idea if yours is that. Quote Link to comment Share on other sites More sharing options...
Luke350 Posted February 15, 2016 Author Share Posted February 15, 2016 Ye and k&n are red. Just had a huge service inc plugs and all filters and fluids. What gains should I expect from doing the above after uprev? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted February 15, 2016 Share Posted February 15, 2016 Ye and k&n are red. Just had a huge service inc plugs and all filters and fluids. What gains should I expect from doing the above after uprev? Sent from my iPhone using Tapatalk Have a look at the dyno results thread, and er obviously your specific HR motor Quote Link to comment Share on other sites More sharing options...
davey_83 Posted February 15, 2016 Share Posted February 15, 2016 http://www.torqen.uk/350z/exhausts/test-pipes/2525-350z-hr-motordyne-advanced-resonance-tuning-art-test-pipes-md-001.html Quote Link to comment Share on other sites More sharing options...
Luke350 Posted February 15, 2016 Author Share Posted February 15, 2016 What part of the exhaust is this davey? Not included in my setup? Why do the test pipes link? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
GMballistic Posted February 15, 2016 Share Posted February 15, 2016 Good to know Rich, it still seems like an Americanism. It is an "Americanism" Rob imo. English dictionary (Collins) definition for "manifold"... Noun a chamber or pipe with a number of inlets or outlets used to collect or distribute a fluid. In an internal-combustion engine the inlet manifold carries the vaporized fuel from the carburettor to the inlet ports and the exhaust manifold carries the exhaust gases away ...and another here; Exhaust manifolds are generally simple cast iron or stainless steel units which collect engine exhaust gas from multiple cylinders and deliver it to the exhaust pipe. A "header" in good old English is "a shot or pass made with the head in football". Yes I dislike "Americanisms". Quote Link to comment Share on other sites More sharing options...
SHEZZA Posted February 15, 2016 Share Posted February 15, 2016 How about a grounding kit ? Quote Link to comment Share on other sites More sharing options...
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