Out with the old, in with the GT4202R
Aug 12, 2008 | 01:08 AM
#32
On The Tree
Joined: Dec 2006
Posts: 158
Likes: 0
From: So. calif.
Aug 12, 2008 | 01:25 PM
#35
You guys shouldn't be looking at only the peak boost and shift rpm's and rather graph out the operating rpm range and boost level. Then you can better figure out what boost/rpm and level/range will keep the compressor in the most efficient range to maximize the output of the compressor. 
Aug 12, 2008 | 01:49 PM
#36
Here's the compressor map for this turbo. It's the 102mm wheel.
Here's an airflow table for a 408ci LS1...mine should be pretty close to this.
At 15 psi (2.02 pressure ratio) and 5700 RPM (which is where I plan to shift) it looks like my engine should consume roughly 76lbs/min of air. At 76lbs/min and 2.02 PR I will be close to the last efficiency line of the turbo.
I'm not sure what RPM the diesels usually run to, but I'm guessing it's somewhere around 4000. If you looks at 4000 RPM, you can take a linear extension of the chart out to 30 psi, which should give you about 82 lbs/min at 30 psi, which is about 3.04 pressure ratio. Looks like that's right in the meaty part of the table for the diesel guys.
I may try short shifting the engine and running more boost....should put the turbo more into it's efficiency range.
Here's an airflow table for a 408ci LS1...mine should be pretty close to this.
At 15 psi (2.02 pressure ratio) and 5700 RPM (which is where I plan to shift) it looks like my engine should consume roughly 76lbs/min of air. At 76lbs/min and 2.02 PR I will be close to the last efficiency line of the turbo.
I'm not sure what RPM the diesels usually run to, but I'm guessing it's somewhere around 4000. If you looks at 4000 RPM, you can take a linear extension of the chart out to 30 psi, which should give you about 82 lbs/min at 30 psi, which is about 3.04 pressure ratio. Looks like that's right in the meaty part of the table for the diesel guys.
I may try short shifting the engine and running more boost....should put the turbo more into it's efficiency range.
Last edited by trever1t; Aug 14, 2008 at 09:46 AM.
Aug 12, 2008 | 03:10 PM
#38
Also yes....diesel will make about 80-85% of a gasser engine total output with a given turbo. Say a single GT4202 will make 1000hp on a gas engine....on a diesel it would max the unit out around 800-850hp.
Last edited by trever1t; Aug 14, 2008 at 09:46 AM.
Aug 12, 2008 | 06:28 PM
#40
Thread Starter
High on diesel fumes
iTrader: (70)
Joined: Mar 2005
Posts: 12,658
Likes: 3
From: Phoenix, AZ
You guys shouldn't be looking at only the peak boost and shift rpm's and rather graph out the operating rpm range and boost level. Then you can better figure out what boost/rpm and level/range will keep the compressor in the most efficient range to maximize the output of the compressor.
That's what its their for.....you guys use whatever you need. If we don't have it...contact us and we can send you a custom consumption chart.
Also yes....diesel will make about 80-85% of a gasser engine total output with a given turbo. Say a single GT4202 will make 1000hp on a gas engine....on a diesel it would max the unit out around 800-850hp.
Also yes....diesel will make about 80-85% of a gasser engine total output with a given turbo. Say a single GT4202 will make 1000hp on a gas engine....on a diesel it would max the unit out around 800-850hp.
