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New BW EFR Turbo Thread

 
Old Mar 9, 2019, 12:15 PM
  #4456  
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Sorry I'm not on here frequently, but you got the dyno chart. The APR dyno is load based and so I don't think the spool characteristics can be read the same way as dynojet or on the road. I also thought the posted APR whp figures always seem high on the VAG graphs. Although these numbers seem right for the setup.
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Old Mar 10, 2019, 02:49 PM
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Originally Posted by Construct View Post
If the temperature and air density numbers on the screen are correct, the 8474 was dynoed on a much colder day. The AIRDENS number differs by about 12% between the two charts. If those numbers are true, that could account for some of the differences.
The dyno logs those things partly so it can normalise the data, it uses SAE correction so it should be compensating for that air density difference and making the two results more or less comparable.
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Old Mar 12, 2019, 02:48 PM
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Originally Posted by MrLith View Post
The dyno logs those things partly so it can normalise the data, it uses SAE correction so it should be compensating for that air density difference and making the two results more or less comparable.
Peak numbers would be comparable, but colder air will help the turbo spool quicker. Correction factor can't correct that.
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Old Mar 12, 2019, 02:53 PM
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Originally Posted by letsgetthisdone View Post
Peak numbers would be comparable, but colder air will help the turbo spool quicker. Correction factor can't correct that.
Absolutely, but I thought the topic was mainly the power difference
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Old Mar 12, 2019, 02:59 PM
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That's about half of what we're looking at, the other half is where the turbo comes on.
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Old Mar 12, 2019, 03:03 PM
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The data so far suggests at the very least it hasn't become a lag monster - the temperature change will have an effect, but it's not likely to make something that was going to have a significant impact "all things equal" suddenly look negligable, surely?
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Old Mar 12, 2019, 03:07 PM
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You are correct. Going off the two charts, and temperature difference I would put money the 2 spool very closely to each other had they been dyno'ed in more similar or cloder to identical conditions. Knowing the source of the graphs also tells me that the way the dyno loads the car hasn't been played with, RTErnie and APR have nothing to gain by pumping the numbers up or making it spool faster with load control.
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Old Mar 17, 2019, 08:08 AM
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I'm trying to decide between a 8374 and a 8474 currently. I'd like the headroom of the 8474 but not sure id really notice the difference in spool. Initial goal is to break in the motor around 600whp and then shoot for a safe 750 or so. I'm just going to be a fun street car with high horse power. Fuel will be e85.

Thanks
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Old Mar 17, 2019, 10:41 PM
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If you are on 2.0, the difference will be not much...it will be laggy and that is that.
If you are on 2.3, 8374 will spool nicely, while 8474 we don't know yet...I would not like anything less than 2.3_8374 spool for street car.
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Old Mar 18, 2019, 05:54 AM
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Originally Posted by alpinaturbo View Post
If you are on 2.0, the difference will be not much...it will be laggy and that is that.
If you are on 2.3, 8374 will spool nicely, while 8474 we don't know yet...I would not like anything less than 2.3_8374 spool for street car.
yea I have an evo x so we cant get reliable motors over 2.0. Iím hoping its around 4500rpm and i can rev out to 8500 giving a pretty good power band.
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Old Mar 19, 2019, 11:09 AM
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Originally Posted by slythy View Post


yea I have an evo x so we cant get reliable motors over 2.0. Iím hoping its around 4500rpm and i can rev out to 8500 giving a pretty good power band.
You must not know about Callies stroker cranks...
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Old Mar 19, 2019, 11:20 AM
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Originally Posted by RWD4G63 View Post


You must not know about Callies stroker cranks...
You must not know that a 94mm stroker in a 4b11 pulls the piston skirt below the bottom of the cylinder and has a garbage rod ratio and is just a terrible idea.
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