How Fast With How Small?
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Joined: Jul 2004
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How Fast With How Small? Those of you with a turbo setup, how fast have you gone or how much horsepower have you made with how small a down pipe? I want to hear from those of you that are running singles with 3 or 3.5” down pipes (<4”), and maybe some dual setups with <2.5” down pipes? A brief description of the setup would help keep the answers in context.
To give you some idea of why I’m asking, I originally set out to find a body/shell to build a turbo project in that I pretty much had all the running gear for, wanting to build a “race car” that could see some street time. What I ended up finding/getting a good deal on was a TA that was lot more complete than I hoped for, it even has working air conditioning and cruise control, it’s actually a really nice driver. So I’m thinking more like “Ok, street car that is going to see a lot of race time…” Looking at it, I think I can see how to wedge everything in it but I’m just not sure about the down pipe. 3” looks tight, and it looks like it would take a minor miracle to fit a 3.5”
To give you some idea of why I’m asking, I originally set out to find a body/shell to build a turbo project in that I pretty much had all the running gear for, wanting to build a “race car” that could see some street time. What I ended up finding/getting a good deal on was a TA that was lot more complete than I hoped for, it even has working air conditioning and cruise control, it’s actually a really nice driver. So I’m thinking more like “Ok, street car that is going to see a lot of race time…” Looking at it, I think I can see how to wedge everything in it but I’m just not sure about the down pipe. 3” looks tight, and it looks like it would take a minor miracle to fit a 3.5”
You can go really fast on a small downpipe. Jose at forced inductions went low 10s or so I think with a 3 inch downpipe in the 1997 SS on their site. I'll be running a 4 incher once I get mine finished. I'm guessing this is a third gen car?
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TECH Apprentice
Joined: Jul 2004
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Engineermike, I’m pretty sure that your combination was one of the ones that I was thinking about, but I might be mixing it up with someone else, I thought that you measured some excessive hot side pressures, E/I pressure ratio and were going to go with something bigger. What hot side are you running on that 76 and what headers/manifolds are you using?
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Mike
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