New BW EFR Turbo Thread
my old digital camera isnt any better than my iphone 4.
Nov 17, 2011, 12:39 AM
#1084
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Nov 17, 2011, 09:51 AM
#1086
As far as mapping things out, I'm on a stock block with a mildly ported head, Comp 280+ cams, tubular exhaust manifold, and a heavily ported stock intake manifold on the IX turbo. Based on AFR and IPW (ID1000s so they should be linear), here is my VE curve. A setup with a larger turbine could expect a few points higher peak and then hold it out much better above 5500. Even with the little td05 turbine though, the motor still manages over 96%VE at 7500 RPM once the cam timing was adjusted. Below 4000 RPM, the data is unreliable as it's transient stuff with boost changing and large changes in AFR and IPW.
BSFC will be in the 0.45 range during spool up, even down to 0.4 at really low boost pressure. 0.47-0.5 at peak torque. If the motor isn't running out of turbo, it will hold around 0.5 until redline if the AFR is flat. Once you start running out of turbo/octane, BSFC will start to climb to the 0.55-0.6 range. A 10:1 motor would pick up 0.02 to 0.04 or so on these number, dropping to the 0.43-0.45 range at peak torque if you aren't octane limited running in the 12:1 AFR range.
http://i874.photobucket.com/albums/a.../VECompare.jpg
BSFC will be in the 0.45 range during spool up, even down to 0.4 at really low boost pressure. 0.47-0.5 at peak torque. If the motor isn't running out of turbo, it will hold around 0.5 until redline if the AFR is flat. Once you start running out of turbo/octane, BSFC will start to climb to the 0.55-0.6 range. A 10:1 motor would pick up 0.02 to 0.04 or so on these number, dropping to the 0.43-0.45 range at peak torque if you aren't octane limited running in the 12:1 AFR range.
http://i874.photobucket.com/albums/a.../VECompare.jpg
Last edited by 03whitegsr; Nov 17, 2011 at 09:57 AM.
Nov 17, 2011, 07:09 PM
#1090
I did the 7670 to about 80% completion. I wanted to add wheel speed and get the VE and BSFC dialed in. I figure I should be at .55 with AFR's ~11.8 and then make my VE match.
In order to get a good idea on VE I think I should be using leets car numbers and boost and work backwards to get a simple VE number for his engine... then improve it from 5k + since I have S3's and a Magnus v5.
I think once I do that I'll have accurate BSFC and VE numbers in the bot. Then I can run the Turbo speed to 130-140k and see where that puts me. I'll be guessing on compressor efficiency, but I know it'll be in the 50% range for sure. My bot analysis was hitting 40psi @ 4-5k and then tapering to 27psi or so @ 8500. It was showing around 650hp and it actually peaking near 8k.
Looked like my HKS7460 dynograph on roids.
I think the 7670 will meet my goals easily. After all... I said I wanted 600whp for as long as possible. I think I'll have 650whp for a good bit of time and who knows... after pushing the wheel speed from 92k to 130k... I bet the bot will give me some more ponies! I think it'll do 675whp on a DJ. Thank god for huge heat exchangers and Ethanol.
In regards to powerband. The torque will be falling hard, but the power will hang in there and give me the overrev I want for running on track. That way I can hold it in a gear without up-shifting...only to downshift back through that gear a split second later.
In order to get a good idea on VE I think I should be using leets car numbers and boost and work backwards to get a simple VE number for his engine... then improve it from 5k + since I have S3's and a Magnus v5.
I think once I do that I'll have accurate BSFC and VE numbers in the bot. Then I can run the Turbo speed to 130-140k and see where that puts me. I'll be guessing on compressor efficiency, but I know it'll be in the 50% range for sure. My bot analysis was hitting 40psi @ 4-5k and then tapering to 27psi or so @ 8500. It was showing around 650hp and it actually peaking near 8k.
Looked like my HKS7460 dynograph on roids.I think the 7670 will meet my goals easily. After all... I said I wanted 600whp for as long as possible. I think I'll have 650whp for a good bit of time and who knows... after pushing the wheel speed from 92k to 130k... I bet the bot will give me some more ponies! I think it'll do 675whp on a DJ. Thank god for huge heat exchangers and Ethanol.
In regards to powerband. The torque will be falling hard, but the power will hang in there and give me the overrev I want for running on track. That way I can hold it in a gear without up-shifting...only to downshift back through that gear a split second later.
Last edited by R/TErnie; Nov 17, 2011 at 07:12 PM.
Nov 18, 2011, 09:02 AM
#1091
I don't see how downstream changes (by other people) could alter the contents of the input data since the URL is effectively a "data dump" of the input data itself.
I just finished giving this a test. I had a colleague here at BW make a MatchBot match and then send me the link. I did this as to make sure that the page wasn't in cache on my machine. I then went into the inputs, messed around with a bunch of them, and then closed the browser. I then opened back up the browser and pasted in his original URL again. The data was unchanged from what he had sent. It did not include the modifications I had just finished making on it. Please feel free to pass this information along to users you observe having problems
Nov 18, 2011, 09:55 AM
#1092
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I might drown in EFR turbos... I arranged a type of group buy and buying where ever I can get one, and now looks like people is cancelling on me due to the price increases of the drop of the local exchange rate....
5x 7670
1x8374
1x7064
this is going to hurt!!!!!
5x 7670
1x8374
1x7064
this is going to hurt!!!!!
Nov 18, 2011, 10:21 AM
#1093
are you sure? per brock:
I don't see how downstream changes (by other people) could alter the contents of the input data since the URL is effectively a "data dump" of the input data itself.
I just finished giving this a test. I had a colleague here at BW make a MatchBot match and then send me the link. I did this as to make sure that the page wasn't in cache on my machine. I then went into the inputs, messed around with a bunch of them, and then closed the browser. I then opened back up the browser and pasted in his original URL again. The data was unchanged from what he had sent. It did not include the modifications I had just finished making on it. Please feel free to pass this information along to users you observe having problems
I don't see how downstream changes (by other people) could alter the contents of the input data since the URL is effectively a "data dump" of the input data itself.
I just finished giving this a test. I had a colleague here at BW make a MatchBot match and then send me the link. I did this as to make sure that the page wasn't in cache on my machine. I then went into the inputs, messed around with a bunch of them, and then closed the browser. I then opened back up the browser and pasted in his original URL again. The data was unchanged from what he had sent. It did not include the modifications I had just finished making on it. Please feel free to pass this information along to users you observe having problems
If I go edit my post, copy the entire link and paste it into my browser... it works.
User fail?
Last edited by R/TErnie; Nov 18, 2011 at 10:24 AM.