Turbo Drive Pressure Data

[GWoody]

We were recently doing some testing on a new turbo and thought it wise to log some of the data from a stock mainfold and turbo prior to putting on the new set up. The truck is an 06 Dodge, everything is stock except we had the Smarty set on 3. In some instances the drive pressure was almost twice as high as the boost. I figured it would be higher but double is just insane!!!! I have pasted the data below. Let me know what you think.



Thanks



Garry



Back Pressure 0. 7

Boost Pressure 0

Throttle 0

Turbo RPM 0

Exhaust Gas Temp 349

Spare 119

Spare 3584

Aux Pressure 0. 5

Board Temp 111

Vane Position 0

Status Flags --T----R

Engine RPM 0

Status Byte 33

Max Deflection 22

Midpoint Defl 10

Min Deflection 0

RPM Breakpoint 22000

RPM Midpoint 27500

RPM Endpoint 31000

Back Pres Break 9

Back Pres End 11

Boost Pres Break 9

Boos Pres End 11

EGT Breakpoint 1000

EGT Endpoint 1100

Parm Status 0

Parm Save Timer 0





Back Pressure Boost Pressure

0. 7 0

0. 6 0

0. 6 0

0. 6 0

0. 6 0

0. 6 0

0. 7 0

0. 5 0

0. 6 0

1. 3 0

2. 5 0

3. 2 0

4 0. 2

4. 3 0. 3

5. 1 0. 8

5. 4 1. 5

5. 6 2. 2

6. 7 2. 5

7. 5 2. 7

7. 9 3. 3

9. 8 4. 5

10. 6 5. 1

11. 6 5. 9

13. 5 6. 7

14. 9 8

16. 5 9. 5

20. 1 10. 8

22. 4 13

27 15. 2

36. 1 20. 2

44. 7 23. 4

47. 1 26. 7

49. 7 29. 1

60. 1 30. 2

59. 5 31. 5

61. 4 32. 2

61. 4 32. 5

61. 9 33. 1

64. 3 33. 1

68. 4 33. 7

66. 7 33. 9

66. 2 34. 2

66. 5 34. 6

67 35. 4

68. 8 35. 5

68 35. 5

66. 5 35. 5

69. 9 35. 6

68. 9 35. 5

71. 8 35. 3

68. 8 35. 4

69. 1 35. 4

68 35. 5

67. 5 35. 4

68. 5 35. 4

69. 1 35. 4

68. 4 35. 4

70. 1 35. 3

72. 4 35. 3

69. 1 35. 5

72. 6 35. 6

69. 9 35. 1

68. 9 35. 4

71. 9 35. 6

71. 1 35. 5

71. 3 35. 8

71. 4 35. 8

74. 2 35. 8

70. 3 35. 8

71. 4 35. 9

70. 8 35. 9

71. 8 35. 8

74. 2 35. 8

76. 1 35. 6

69. 9 35. 6

68. 6 35. 9

66. 4 36. 6

66. 5 36. 8

71. 3 36. 9

69. 9 36. 8

66. 9 37

70. 4 36. 8

68. 4 36. 6

65. 5 36. 9

59. 3 37. 3

60 37. 8

54. 7 38. 4

54. 2 38. 5

55. 5 38. 6

52. 8 39

53. 7 38. 8

55. 4 38. 8

55. 1 38. 6

59. 4 38. 5

56. 1 38. 3

56. 1 38. 1

61. 5 38. 3

57. 4 38

60 38

60. 3 37. 9

59. 4 37. 8

60. 6 37. 8

59. 8 37. 9

61. 1 37. 9

62. 3 37. 8

61. 5 37. 9

62. 4 37. 8

62. 8 37. 8

63. 5 37. 9

63. 8 37. 9

63. 1 37. 9

65. 2 37. 8

65. 4 37. 8

63. 8 37. 6

65. 9 37. 6

63. 3 37. 6

65 37. 5

66. 4 37. 6

63. 6 37. 6

66. 3 37. 4

65. 4 37. 5

65. 9 37. 3

68. 6 37. 3

68. 6 37. 4

69. 8 37. 3

69. 2 37. 4

67. 9 37. 4

65. 4 37. 3

70. 9 37. 3

65. 8 37. 4

73. 4 37. 4

68. 6 37. 3

66. 3 37. 3

67. 9 37. 3

73. 1 37. 5

70. 4 37. 5

67. 8 37. 6

71. 2 37. 5

73. 2 37. 6

67. 8 37. 8

70. 8 37. 8

64. 7 37. 6

55. 5 37

47. 9 34. 1

41. 8 29. 3

38. 1 26. 3

37. 5 25. 3

32. 7 22. 7

31. 5 20. 6

30. 9 20. 1

27. 7 19

27. 6 18. 2

24. 6 17. 3

22. 8 16

19. 4 14. 8

16. 5 13. 9

17. 8 13. 3

15. 5 12. 3

14. 9 11. 6

13. 3 10. 4

12. 3 9. 7

10. 9 8. 2

10 7. 2

9. 2 6. 5

8. 6 6

8. 4 5. 5

7. 4 5. 4

6. 5 4. 5

6. 2 4. 5

5. 7 3. 3

5. 9 3. 2

5. 5 2. 8

5. 4 2. 6

5. 1 2. 5

4. 9 2. 5

4. 9 2. 5

4. 6 2. 5

4. 3 2. 1

4. 3 1. 6

4. 1 1. 5

4. 1 1. 5

4 1. 5

3. 6 1. 3

3. 6 1. 1

3. 5 1

3. 5 0. 8

3. 3 0. 7

3. 3 0. 7

3 0. 6

3. 1 0. 3

3. 2 0. 3

3 0. 3

2. 8 0. 3

2. 7 0. 3

2. 7 0. 3

2. 7 0. 3

2. 6 0. 2

 

[AH64ID]

You were able to get your DP much higher than I ever can. At about 55-60 psi of DP the WG seems to blow open on me and drop the DP back down. The most I have seen out of my setup is 60/35. DP really only takes off on hard acceleration and/or high rpms. Even at 90% or greater throttle when towing at 2K rpms it holds about a 1. 2:1 for me.

But no doubt the DP is crazy when you turn the WG off; part of the reason a HE351VE is in my future.

 

[MChrist]

Somewhat related questiion... On my Aurora 4000 Plus Compound turbo setup, my factory turbo is modified to open the wastegate earlier than stock. Would this equal lower drive pressure, even though there is a second turbo right behind it? At full boost, I can run around 44 psi at the boost gauge. Also, if I wanted to measure drive pressure, could I just pull the pyrometer and measure pressure from that point?

 

[AH64ID]

Yes, and yes.

 

[MChrist]

I'll have to check that out and add to this thread. May be helpful to others. From what I've seen, I just need to isolate/insulate boost gauge from exhaust heat via coiled copper line.

 

[AH64ID]

Correct, I use a 5' piece.

 

[MChrist]

Would it be OK to leave it on for a while, or just a quick charge down the road for test purposes. Also, anybody know what a "safe" pressure would be for stock head bolts? ATS says no problem with up to 50 boost, but which is more telling, boost or turbo drive pressure. In other words, is 44 boost with 88 drive pressure safer than 30 boost with 100 drive pressure? Inquiring minds want to know...

 

[AH64ID]

I have had mine on for 2 years, it can be a permanent setup.

Boost is what blows HG's, not DP. . Now here is a very simple equation as to why. Any time the cylinder moves up with both the exhaust and intake valve closed you get 17. 2:1 compression on the air, so in a 0 boost setup that's at least 250 psi, and really its higher as min psi is 350 and realistic is about 400-450... So now lest say you have 50 psi of boost, plus atmospheric pressure, is about 64. 7 psi, times the 17. 2 is 1112 psi, and that's with no increase in pressure from ignition. So you can see that the 100 psi of DP (2:1 at 50psi of boost) is no where near the max pressure the HG sees, which will exceed 2K psi stock.

 

[GWoody]

You were able to get your DP much higher than I ever can. At about 55-60 psi of DP the WG seems to blow open on me and drop the DP back down. The most I have seen out of my setup is 60/35. DP really only takes off on hard acceleration and/or high rpms. Even at 90% or greater throttle when towing at 2K rpms it holds about a 1. 2:1 for me.



But no doubt the DP is crazy when you turn the WG off; part of the reason a HE351VE is in my future.

Yeah, that run was a full throttle run from 0 mph till the egt hit about 1300.

 

[MChrist]

Thanks, AH64ID, so it seems that Drive Pressure is mostly relative to how easily exhaust can get out of the cylinder? Less drive pressure = less work to expel exhaust out of cylinder head=more power=bigger smile?

 

[AH64ID]

yes, the closer the ratio is to 1:1 the more efficient the motor is.

 

[GWoody]

yes, the closer the ratio is to 1:1 the more efficient the motor is.

That is so true, take a look at the data below after we put the new test turbo on.

The boost is the right set of numbers and the left is the drive pressure.

It looses it's format when I try to paste it and it's too large to attach it in a file. I tried a zip folder but the website won't accept a zip file.



Time Back Pressure Boost Pressure Throttle Turbo RPM Exhaust Gas Temp Vane Position

0 0. 2

0. 1 0. 1

0 0. 1

0. 1 0. 2

0. 1 0. 1

0 0. 2

0 0. 2

0. 1 0. 1

0. 1 0. 2

0. 1 0. 2

0. 1 0. 2

0 0. 2

0. 1 0. 2

0 0. 2

0 0. 2

0. 1 0. 2

0 0. 2

0. 1 0. 1

0. 7 0. 2

1. 1 0. 2

1. 5 0. 2

1. 5 0. 2

1. 8 0. 2

1. 7 0. 3

1. 5 0. 3

2 0. 3

1. 7 0. 7

2. 1 1. 1

2. 1 1. 5

2. 1 1. 5

2. 2 2. 3

2. 6 2. 5

2. 2 2. 5

2. 7 2. 5

3. 1 2. 6

3. 2 2. 8

3. 2 3. 2

3. 5 3. 5

3. 7 4. 3

4 4. 5

4. 6 4. 5

4. 2 5

4. 7 5. 4

5. 1 5. 7

5. 6 6. 2

6. 1 6. 6

7 7. 6

7. 4 8. 2

7. 7 9. 1

9 10

9. 5 11. 1

10. 6 12. 6

12. 9 14. 3

15. 7 16

18. 4 18. 4

23. 1 22. 7

24. 7 25. 8

27. 2 27. 3

29. 9 29. 9

34. 8 32. 7

34. 3 34. 1

31. 5 34. 8

32. 6 35. 9

34. 3 37

33. 1 37. 4

35 37. 8

35. 4 37. 8

35. 3 37. 9

35. 4 37. 9

33. 9 38

35. 3 38

35. 6 38. 3

38. 8 38. 1

36. 5 38. 4

36. 6 38. 5

37. 5 38. 4

38. 3 38. 5

39. 4 38. 4

39. 8 38. 6

41. 2 38. 8

40. 9 38. 8

39. 8 38. 8

41. 3 38. 9

41. 2 38. 9

41. 5 39

41 39. 2

42. 4 39. 2

40. 2 39. 4

40 39. 7

41. 4 40

40. 9 40. 2

39. 9 40. 2

39. 5 40. 2

39. 8 40. 3

40 40. 3

39. 8 40. 3

40. 4 40. 5

40. 4 40. 5

40. 7 40. 8

40 40. 7

39. 4 41. 3

38. 8 41. 5

36. 4 41. 9

35. 5 42. 2

32. 5 41. 9

33. 2 41. 8

32. 9 41. 8

33. 7 42. 2

32. 1 42. 4

33. 2 42. 5

34. 4 42. 2

33. 9 42. 2

34 42. 2

33. 2 42

34 42. 2

33. 6 42. 2

33. 1 42. 3

33. 7 42

33. 7 41. 7

34 41. 5

35. 5 41. 7

34. 1 41. 5

34. 2 41. 7

34. 6 41. 8

35. 6 41. 8

34. 4 41. 7

36. 1 41. 7

35. 4 41. 7

36. 8 41. 5

35. 5 41. 4

35. 6 41. 5

36. 5 41. 5

37. 8 41. 5

35. 3 41. 7

38. 1 41. 8

38. 1 41. 7

37. 6 42. 3

35. 8 42. 2

38. 1 42. 3

36. 4 42. 2

37. 8 42. 3

37. 4 42. 2

37. 4 42. 2

37. 9 42. 5

38. 6 42. 5

38. 5 42. 4

39. 1 42. 5

37. 6 42. 3

38. 1 42. 4

39. 3 42. 4

38. 5 42. 3

40. 7 42. 3

39. 5 42. 2

40. 7 42. 2

39. 2 42

39. 7 42

39. 1 42. 2

40. 3 42

39. 5 41. 9

40. 5 41. 9

39. 8 41. 8

40. 5 41. 9

37. 8 42

40 42

39. 4 41. 9

38. 1 41. 8

41. 2 42. 2

38. 4 43. 7

35. 6 44. 2

34. 4 45. 6

32. 9 46. 2

30. 1 45. 9

31. 4 45. 4

29. 2 45. 4

29. 7 45. 3

29. 5 45. 3

29. 9 45. 2

29. 4 45. 3

29. 3 45. 3

29 45. 2

29. 5 44. 4

26. 3 42. 9

23. 2 40. 5

20. 9 39. 3

19. 6 36. 8

15. 5 33

13. 1 29. 3

10 23. 3

8. 7 21. 8

7. 7 18. 5

6. 1 14. 7

5. 4 13

4. 9 11

4. 3 9. 8

4. 3 8. 4

3. 7 7. 5

3. 8 6. 5

3. 2 5. 9

2. 7 4. 8

2. 7 4. 5

2. 6 4. 5

2. 6 3. 3

2. 3 2. 8

2. 3 2. 5

2. 2 2. 5

2 2. 5

2 2. 3

2. 1 1. 7

2 1. 5

1. 7 1. 5

1. 8 1. 2

1. 8 0. 8

1. 7 0. 7

1. 8 0. 6

1. 6 0. 5

1. 7 0. 3

1. 7 0. 3

1. 6 0. 3

1. 7 0. 3

1. 5 0. 3

1. 7 0. 3

1. 6 0. 3

1. 6 0. 2

1. 7 0. 2

1. 6 0. 2

1. 6 0. 2

1. 6 0. 2

1. 6 0. 2

1. 6 0. 1

1. 3 0. 2

1. 5 0. 1

1. 5 0. 1

1. 3 0

1. 5 0. 1

1. 2 0

 

[AH64ID]

What turbo is that?

 

[GWoody]

What turbo is that?

This turbo is called Cobra, it gets it's name from the design of the inlet on the turbine. It's is known as an AIT charger, which is Adjustable Inlet Throat. This is an exclusive patented design made by Blaylock Turbo. I have attached a couple of graphs that puts things in a little better perspective. On a side note to the moderators, I am not trying to sell anything, just providing some technical data for folks to take a look at. When this is ready to go to market we will make the appropriate contacts for those arrangements.



Thanks



Garry

 

[rscurtis]

Lower drive pressure also = better fuel economy.

 

[GWoody]

Lower drive pressure also = better fuel economy.

Yup, on this truck we have seen almost an 18% gain. The towing temps really came down using this charger which was another huge plus.

 

[AH64ID]

How's the testing going? Any pics of the AIT?

 

[GWoody]

How's the testing going? Any pics of the AIT?

Things are going good, this thing really makes it nice to tow with. It allows the user to set the vane for regular driving, racing, or towing. It makes the truck think you changed turbo chargers. I tried to attach a picture of the compressor side.

 

[rscurtis]

Who makes the center section on this turbo?

 

[GWoody]

Who makes the center section on this turbo?

The entire unit is manufactured by Blaylock Turbo. I attached a pic that was taken during the install on my 06.