Turbo Effeciency Tables
Jan 7, 2010, 07:21 PM
#16
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I was using the exact same calculator but an online version. My VEs were a little low.
I used your VE values on the 20g table and came up with the following....
3500 = 18 psi
4200 = 24 psi
4500 = 27.5 psi
5000 = 27.5 psi
5500 = 26.5 psi
6000 = 25.5 psi
6500 = 24 psi
7800 = 22.5 psi
This would about max out the turbo in my case.
Of course these are estimates because I do not have the Green table.
I used your VE values on the 20g table and came up with the following....
3500 = 18 psi
4200 = 24 psi
4500 = 27.5 psi
5000 = 27.5 psi
5500 = 26.5 psi
6000 = 25.5 psi
6500 = 24 psi
7800 = 22.5 psi
This would about max out the turbo in my case.
Of course these are estimates because I do not have the Green table.
Last edited by Appauldd; Jan 7, 2010 at 08:32 PM. Reason: Values were a little off.
Jan 7, 2010, 07:28 PM
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It does seem a bit low. Ironically enough....those values are almost exactly what my last log showed. How weird.
I wish FP would post the table for us. I emailed them....no response yet.
I wish FP would post the table for us. I emailed them....no response yet.
Jan 7, 2010, 07:29 PM
#19
Jan 7, 2010, 07:33 PM
#20
Actually looking at the map again, it may be that compressor. I think I remember Robert or someone at FP stating that the standard green's compress wheel was rated at 47lb/min, which would line up with that compressor map. And I also remember a plot from a member here showing a max airflow of something like 47.8 lb.min when he maxed out his green when they first came out.
I know the HTA green has a 54lb/min, red 60lb/min, and black 68 lb/min compressor wheel.
I know the HTA green has a 54lb/min, red 60lb/min, and black 68 lb/min compressor wheel.
Jan 7, 2010, 07:39 PM
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That is just odd to me. Why can the stock VIII turbo hold more boost? ? ?
Stock VIII calculations....
3000 = 25psi
3400 = 33psi
4000 = 33psi
6500 = 23psi
7500 = 22psi
This is the maximums and still remain on the efficiency table.
Stock VIII calculations....
3000 = 25psi
3400 = 33psi
4000 = 33psi
6500 = 23psi
7500 = 22psi
This is the maximums and still remain on the efficiency table.
Jan 7, 2010, 09:41 PM
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Jan 8, 2010, 12:12 AM
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are you sure you have nothing wrong with ur turbine housing, or BOV? could it be you have a leak some where that is causing boost to decrease? did you check your compressor housing wheel? many parameters can coz that.
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Jan 8, 2010, 07:21 AM
#24
Jan 8, 2010, 02:47 PM
#25
Just keep turning up the boost until it starts showing true limits.
A healthy setup in it's efficiency range not limited by the tune will pick up almost 15 HP/psi.
As boost starts to reach the limits of various things (mostly the turbo), that will drop considerably. At the limit, the car either won't make any more power because an increase in boost requires either reducing timing or adding fuel to the point that the two changes counteract each other or the turbo won't make any more boost.
On a street setup where you want things to last, having a conservative limit (say 5-8HP/psi minimum) helps and on crap gas, it helps leave a little room for poor gas quality.
With regards to actually mapping this out, I think trying to get accurate results with out a calibrated MAF, pre and post turbo pressure transducers and air temp sensors is pretty much a waste of time. You can use the ECU parameters to get a rough idea, but it won't be very accurate.
Without a true compressor flow map, it's also just about worthless.
As for maxing out turbochargers, I've tended to notice that a car that is choked on the turbine will often keep making more boost, but increasing the boost won't raise power. On compressor limited setups, you get boost drop. I'd rather have the later since typically as boost drops, you can actually get more aggressive with the tune provided you have adequate intercooling capacity.
A healthy setup in it's efficiency range not limited by the tune will pick up almost 15 HP/psi.
As boost starts to reach the limits of various things (mostly the turbo), that will drop considerably. At the limit, the car either won't make any more power because an increase in boost requires either reducing timing or adding fuel to the point that the two changes counteract each other or the turbo won't make any more boost.
On a street setup where you want things to last, having a conservative limit (say 5-8HP/psi minimum) helps and on crap gas, it helps leave a little room for poor gas quality.
With regards to actually mapping this out, I think trying to get accurate results with out a calibrated MAF, pre and post turbo pressure transducers and air temp sensors is pretty much a waste of time. You can use the ECU parameters to get a rough idea, but it won't be very accurate.
Without a true compressor flow map, it's also just about worthless.
As for maxing out turbochargers, I've tended to notice that a car that is choked on the turbine will often keep making more boost, but increasing the boost won't raise power. On compressor limited setups, you get boost drop. I'd rather have the later since typically as boost drops, you can actually get more aggressive with the tune provided you have adequate intercooling capacity.
Last edited by 03whitegsr; Jan 8, 2010 at 02:53 PM.
Jan 8, 2010, 06:45 PM
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A$$ : ) Love your sarcasm.
Your direct link doesn't work.
That table is the same one that is already in the Excel calculator.
I sure wish these companies would come off of their data.....sheesh.
Your direct link doesn't work.
That table is the same one that is already in the Excel calculator.
I sure wish these companies would come off of their data.....sheesh.
Last edited by Appauldd; Jan 8, 2010 at 06:50 PM. Reason: Add info.
Jan 8, 2010, 06:58 PM
#30
I edited out the sarcasm. 
Actually, the Stealth316 link is the same one you posted above. I have a feeling they might be doing some checking of the referrer to prevent direct linking; you can get to it from here: http://www.stealth316.com/2-3s-compflowmaps.htm
Actually, the Stealth316 link is the same one you posted above. I have a feeling they might be doing some checking of the referrer to prevent direct linking; you can get to it from here: http://www.stealth316.com/2-3s-compflowmaps.htm