Curious what you all think of this dyno read out? |
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Curious what you all think of this dyno read out? |
Tdskip |
Sep 20 2021, 01:02 PM
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#1
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
Several twists and turns I’m getting close to getting that XN turbo big bore engine back to me. This is the one that had a very elaborate homebrew turbo set up turns out was only running on three out of four cylinders when I did the initial teardown. I ended up having to swap the case out for another one because when it was rebuilt for the first time it was developing crazy high will pressure hand given all the unknowns and some funkiness with it that we discovered we decided it would be better to just use another case
Shop let me know going in the carbs I gave them would be snappy and responsive but probably leave horsepower on the table. The shop also noted that this was not run using optimized headers and exhaust is probably a bit restrictive for this sort of build. Thing that really jumps out to me here is that the engine is making lotta torch, or at least seems to be a lot of work, down low and had a very usable or p.m. That, to my son white uneducated eyes, suggest that should be fun for regular street use. What do you all think? |
Rufus |
Oct 1 2021, 10:40 PM
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#2
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Member Group: Members Posts: 314 Joined: 8-April 06 From: Central NC Member No.: 5,840 Region Association: None |
Quoting Tdskip: “… a very elaborate homebrew turbo set up …”
It’s not clear what this means, especially “homebrew”. But if it still has a turbo, I hope someone knowledgeable/ experienced has had a hand in it. Matching a turbo & engine is kinda complex and theoretical. If not done correctly, problems like driveability, etc can result. Here’s a link with a little info on turbo mapping: https://www.garrettmotion.com/wp-content/up...03_Expert-1.pdf I’m not experienced in turbo matching, but was close enough to it at my last employer to know it’s definitely not a one-size-fits-all proposition. |
Tdskip |
Oct 2 2021, 06:01 AM
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#3
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
Quoting Tdskip: “… a very elaborate homebrew turbo set up …” It’s not clear what this means, especially “homebrew”. But if it still has a turbo, I hope someone knowledgeable/ experienced has had a hand in it. Matching a turbo & engine is kinda complex and theoretical. If not done correctly, problems like driveability, etc can result. Here’s a link with a little info on turbo mapping: https://www.garrettmotion.com/wp-content/up...03_Expert-1.pdf I’m not experienced in turbo matching, but was close enough to it at my last employer to know it’s definitely not a one-size-fits-all proposition. Good morning, the turbo set up was removed, this engine is naturally aspirated now. Sorry if that wasn’t as clear as it should have been. |
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