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The Terminator
Exhaust
Long tube power gains?
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<blockquote data-quote="SlowSVT" data-source="post: 10545543" data-attributes="member: 20202"><p><strong>So what you’re saying is the VERY restrictive factory cast iron manifold actually works pretty well at high RPM where they need to move large quantities of gasses very quickly compared to a VERY low restriction set of long tube headers that actually scavenge the exhaust? But for some reason the factory manifold doesn't work very well in the mid range</strong> :dw:</p><p></p><p>That seems almost backwards!</p><p></p><p>This post is mostly conjecture with no real data just a generalized statements. MM&FF mods for mods series articles on the Terminator engine and did a battery of very careful test confirmed on an engine dyno. One was a long tube vs. the factory manifold and both graphs almost mirrored one another and the difference was 10 hp at top end. I have the article and can dig it up for you if you would like.</p><p></p><p>There was a post on here years ago where a guy did the exact same thing and ran "before & after" dyno runs and was pissed as hell after recording a 5 hp difference after spending 12 hours and $1000 :cuss:</p><p></p><p>There are countless threads on this site and the conclusion is headers don't work very well on a mildly hopped up Terminator engine. In an NA applications you will get better results. All headers do is help rid the cylinder of spent gasses and reduce the pumping losses somewhat but having a blower in front of the everything does most of that. In the end what matters is having the least amout of unburnt gasses in the cylinder to maximize power input. If the blower can purge most of that during valve overlap then you have achived that goal.</p><p></p><p>Something tells me you are running LT's and the results were amazing! </p><p></p><p>Running E85 at 650 hp the OP would probably be well served getting a set of LT's IF he was planning on keeping it. But he plans on going to turbo where that money would be better spent elsewhere.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 10545543, member: 20202"] [B]So what you’re saying is the VERY restrictive factory cast iron manifold actually works pretty well at high RPM where they need to move large quantities of gasses very quickly compared to a VERY low restriction set of long tube headers that actually scavenge the exhaust? But for some reason the factory manifold doesn't work very well in the mid range[/B] :dw: That seems almost backwards! This post is mostly conjecture with no real data just a generalized statements. MM&FF mods for mods series articles on the Terminator engine and did a battery of very careful test confirmed on an engine dyno. One was a long tube vs. the factory manifold and both graphs almost mirrored one another and the difference was 10 hp at top end. I have the article and can dig it up for you if you would like. There was a post on here years ago where a guy did the exact same thing and ran "before & after" dyno runs and was pissed as hell after recording a 5 hp difference after spending 12 hours and $1000 :cuss: There are countless threads on this site and the conclusion is headers don't work very well on a mildly hopped up Terminator engine. In an NA applications you will get better results. All headers do is help rid the cylinder of spent gasses and reduce the pumping losses somewhat but having a blower in front of the everything does most of that. In the end what matters is having the least amout of unburnt gasses in the cylinder to maximize power input. If the blower can purge most of that during valve overlap then you have achived that goal. Something tells me you are running LT's and the results were amazing! Running E85 at 650 hp the OP would probably be well served getting a set of LT's IF he was planning on keeping it. But he plans on going to turbo where that money would be better spent elsewhere. [/QUOTE]
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