Cheep horse power!! - Page 2 - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

2nd Generation Specific 1986-1992 Discussion

Cheep horse power!!

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Old 10-28-2002, 08:00 PM
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65hp from welding your 5/6th ports open and a straight exhaust...

Was this exhaust manifold back, or what.
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Old 10-31-2002, 04:46 PM
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that's just my guess
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Old 10-31-2002, 04:46 PM
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and from the manifold back, no cats or muffler
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Old 10-31-2002, 04:48 PM
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We are going to try to put my stock exhaust back on and dyno it than put the one we made up on to see what diffrance it made on a dyno
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Old 10-31-2002, 04:50 PM
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I don't think we could patent pipe, that would be like trying to patent watter.
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Old 10-31-2002, 05:01 PM
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dyno results would be nice.
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Old 10-31-2002, 05:33 PM
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question... does wirig open the ports actually increase horsepower? i mean they open at 3800 anyway.... whats the difference... arent you just losing low end?
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Old 10-31-2002, 05:37 PM
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Originally Posted by 90_GTU_jeremy' date='Oct 31 2002, 10:33 PM
question... does wirig open the ports actually increase horsepower? i mean they open at 3800 anyway.... whats the difference... arent you just losing low end?
yes, you only have to wire them open when they are not opening properly on their own. Or if you are trying to remove the sleeves and actuators in hopes of improving flow... though the port shape in the end housings for the aux ports is not good for flow stock without the sleeves.. better off with the sleeves in with the pineapple inserts or other custom modification...
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Old 10-31-2002, 07:09 PM
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Originally Posted by 90_GTU_jeremy' date='Oct 31 2002, 05:33 PM
question... does wirig open the ports actually increase horsepower? i mean they open at 3800 anyway.... whats the difference... arent you just losing low end?
if they are already opening on their own, u don't gain anything by tieing them open, u just lose low end.
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Old 11-01-2002, 12:57 PM
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i can say for certain that it is nowhere near 65 hp (over stock). the most rwhp i have seen out of a stock NA block is 200, and that was with everything tuned, not just a straight pipe. but i am sure it is a significant gain with jsut the straight pipe. it is amazing how much the cats can change the performance characteristics of an engine
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