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DSMxTSi | Jan-15-06 11:54 AM |
Old School 2GNTer
217 posts,
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#895, "RE: Are intake manifolds interchangeable?"
In response to In response to 3
Jan-15-06 11:55 AM by DSMxTSi
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Originally posted by 420a-Tnthewerks
consider extrude honed
Definately consider Extrude Honing a 1g intake manifold. My 1990 Talon has one and it's been one of the best mods ever. There was a test done to several intakes including a stock 1g. My opinion from that test was that a stock 1g intake is great for a street car without the need for tons of top end power, I wish they would have also tested an Extrude Honed 1g intake.
Here's a couple graphs:
http://208.186.78.102/forums/attachment.php?s=4ac64359016ccaa5772bb66cbcad6661&attachmentid=45735&d=1106671935
http://208.186.78.102/forums/attachment.php?s=4ac64359016ccaa5772bb66cbcad6661&attachmentid=45736&d=1106671935
Here's a post from DSMtuners that says a lot:
Anyway, to a serious reply: out of the entrants in that shootout, I think a few obvious manifolds emerged, depending on your needs. This is all BANME!; frankly, people should do their own analysis of the data, because there's some interesting stuff in there if you spend a few minutes with it.
If you need quick spool-up, the Hogans/Extreme manifold really shined here; it was significantly ahead of the rest in airflow increase vs. time. So far ahead, in fact, that I wonder if something was up with this test. For low-speed autocross use, this one looks like a winner to me.
Up top, the Venom dominated, no question about it. Just about the time the 1g intake is losing steam (6500 RPM), it starts to really shine, and doesn't show much sign of falling off anytime soon; they shut the testing down at just shy of 7800 RPM, and it was still trending upward. If you're regularly seeing 8000 RPM and up, this is the probably one for you, but only "real" drag racers need apply, I'd think.
For mid-range, the stock 1g manifold was very impressive. From 4700-6500 RPM, it really dominated the rest; looking a time-vs-airflow graph, it stands out, but once you look at RPM-vs-airflow, there's no question. The problem is, it takes a beating off the line, and past 6500 RPM it levels off (although I think the average person would have a hard time finding fault in 54-55lbs/min). If your regular operating range is 4500-6500, though, I'd have a hard time suggesting using anything else (think road racing, autocross, etc).
In the end, if you have a street car, I can't see you having much of a problem with the stock 1g manifold. Porting would probably help the top-end a bit, but I suspect that impressive midrange would become less so. It's really a shame they didn't have the time to do a stock 2g, extrude-honed 1g/2g, or Cyclone (one pass with runners closed, one with them open), because I think you'd find some interesting numbers from both the 2g and the Cyclone. But I'm just grateful for what they did have a chance to do.
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