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Re: Holley Sniper 440 timing question [Re: Twostick] #2736290
01/24/20 08:45 PM
01/24/20 08:45 PM
Joined: Aug 2011
Posts: 2,842
Pattison Texas
CSK Offline
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Originally Posted by Twostick
Originally Posted by Cab_Burge
How many inches of vacuum or pounds of manifold pressure is 64.1 KPA?


Just shy of 19.

http://www.kylesconverter.com/pressure/kilopascals-to-inches-of-mercury

Kevin

That conversion is not correct
This is what a automotive Vacuum gauge would read

Default MAP kPa to inHg (vacuum gauge) to PSIG

105 kPa = +1.48 inHg = +0.72 psig
104 kPa = +1.18 inHg = +0.58 psig
103 kPa = +0.89 inHg = +0.43 psig
102 kPa = +0.59 inHg = +0.29 psig
101 kPa = +0.30 inHg = +0.14 psig
100 kPa = -0.0 inHg = -0.00 psig
99 kPa = -0.30 inHg = -0.14 psig
98 kPa = -0.59 inHg = -0.29 psig
97 kPa = -0.89 inHg = -0.43 psig
96 kPa = -1.18 inHg = -0.58 psig
95 kPa = -1.48 inHg = -0.72 psig
94 kPa = -1.78 inHg = -0.87 psig
93 kPa = -2.07 inHg = -1.01 psig
92 kPa = -2.37 inHg = -1.16 psig
91 kPa = -2.66 inHg = -1.30 psig
90 kPa = -2.96 inHg = -1.45 psig
89 kPa = -3.26 inHg = -1.59 psig
88 kPa = -3.55 inHg = -1.74 psig
87 kPa = -3.85 inHg = -1.88 psig
86 kPa = -4.14 inHg = -2.03 psig
85 kPa = -4.44 inHg = -2.17 psig
84 kPa = -4.73 inHg = -2.32 psig
83 kPa = -5.03 inHg = -2.46 psig
82 kPa = -5.33 inHg = -2.61 psig
81 kPa = -5.62 inHg = -2.75 psig
80 kPa = -5.92 inHg = -2.90 psig
79 kPa = -6.22 inHg = -3.04 psig
78 kPa = -6.51 inHg = -3.19 psig
77 kPa = -6.81 inHg = -3.33 psig
76 kPa = -7.11 inHg = -3.48 psig
75 kPa = -7.40 inHg = -3.62 psig
74 kPa = -7.70 inHg = -3.77 psig
73 kPa = -7.99 inHg = -3.91 psig
72 kPa = -8.29 inHg = -4.06 psig
71 kPa = -8.59 inHg = -4.20 psig
70 kPa = -8.88 inHg = -4.35 psig
69 kPa = -9.18 inHg = -4.49 psig
68 kPa = -9.47 inHg = -4.64 psig
67 kPa = -9.77 inHg = -4.78 psig
66 kPa = -10.07 inHg = -4.93 psig
65 kPa = -10.36 inHg = -5.07 psig
64 kPa = -10.66 inHg = -5.22 psig
63 kPa = -10.96 inHg = -5.36 psig
62 kPa = -11.25 inHg = -5.51 psig
61 kPa = -11.55 inHg = -5.65 psig
60 kPa = -11.84 inHg = -5.80 psig
59 kPa = -12.14 inHg = -5.94 psig
58 kPa = -12.44 inHg = -6.09 psig
57 kPa = -12.73 inHg = -6.23 psig
56 kPa = -13.03 inHg = -6.38 psig
55 kPa = -13.32 inHg = -6.52 psig
54 kPa = -13.62 inHg = -6.67 psig
53 kPa = -13.92 inHg = -6.81 psig
52 kPa = -14.21 inHg = -6.96 psig
51 kPa = -14.51 inHg = -7.10 psig
50 kPa = -14.80 inHg = -7.25 psig
49 kPa = -15.10 inHg = -7.39 psig
48 kPa = -15.40 inHg = -7.54 psig
47 kPa = -15.70 inHg = -7.68 psig
46 kPa = -15.99 inHg = -7.83 psig
45 kPa = -16.28 inHg = -7.97 psig
44 kPa = -16.58 inHg = -8.12 psig
43 kPa = -16.88 inHg = -8.26 psig
42 kPa = -17.17 inHg = -8.41 psig
41 kPa = -17.47 inHg = -8.55 psig
40 kPa = -17.77 inHg = -8.70 psig
39 kPa = -18.06 inHg = -8.84 psig
38 kPa = -18.36 inHg = -8.99 psig
37 kPa = -18.65 inHg = -9.13 psig
36 kPa = -18.95 inHg = -9.28 psig
35 kPa = -19.25 inHg = -9.42 psig
34 kPa = -19.54 inHg = -9.57 psig
33 kPa = -19.84 inHg = -9.71 psig
32 kPa = -20.13 inHg = -9.86 psig
31 kPa = -20.43 inHg = -10.00 psig
30 kPa = -20.73 inHg = -10.15 psig
29 kPa = -21.02 inHg = -10.29 psig
28 kPa = -21.32 inHg = -10.44 psig
27 kPa = -21.61 inHg = -10.58 psig
26 kPa = -21.91 inHg = -10.73 psig
25 kPa = -22.21 inHg = -10.87 psig
24 kPa = -22.50 inHg = -11.02 psig
23 kPa = -22.80 inHg = -11.16 psig
22 kPa = -23.09 inHg = -11.31 psig
21 kPa = -23.39 inHg = -11.45 psig
20 kPa = -23.69 inHg = -11.60 psig
19 kPa = -23.98 inHg = -11.74 psig
18 kPa = -24.28 inHg = -11.89 psig
17 kPa = -24.58 inHg = -12.03 psig
16 kPa = -24.87 inHg = -12.18 psig
15 kPa = -25.17 inHg = -12.32 psig
14 kPa = -25.46 inHg = -12.47 psig
13 kPa = -25.76 inHg = -12.61 psig
12 kPa = -26.06 inHg = -12.76 psig
11 kPa = -26.35 inHg = -12.90 psig
10 kPa = -26.65 inHg = -13.05 psig
9 kPa = -26.94 inHg = -13.19 psig
8 kPa = -27.24 inHg = -13.34 psig
7 kPa = -27.54 inHg = -13.48 psig
6 kPa = -27.83 inHg = -13.63 psig
5 kPa = -28.13 inHg = -13.77 psig
4 kPa = -28.42 inHg = -13.92 psig
3 kPa = -28.72 inHg = -14.06 psig
2 kPa = -29.02 inHg = -14.21 psig
1 kPa = -29.31 inHg = -14.35 psig
0 kPa = -29.61 inHg = -14.50 psig


Last edited by csk; 01/24/20 10:03 PM.

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: Holley Sniper 440 timing question [Re: CSK] #2736331
01/24/20 10:43 PM
01/24/20 10:43 PM
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Spyphish Offline OP
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So I have got a lot of info from this thread. Do I need a Holley special cable to hook to the computer or a regular USB. Thanks

Last edited by Spyphish; 01/24/20 10:44 PM.

CALMED THE QUAKE!!!(AGAIN!)
Re: Holley Sniper 440 timing question [Re: CSK] #2736356
01/25/20 01:31 AM
01/25/20 01:31 AM
Joined: May 2003
Posts: 6,545
Downtown Roebuck Ont
Twostick Offline
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Originally Posted by csk
Originally Posted by Twostick
Originally Posted by Cab_Burge
How many inches of vacuum or pounds of manifold pressure is 64.1 KPA?


Just shy of 19.

http://www.kylesconverter.com/pressure/kilopascals-to-inches-of-mercury

Kevin

That conversion is not correct
This is what a automotive Vacuum gauge would read

Default MAP kPa to inHg (vacuum gauge) to PSIG

105 kPa = +1.48 inHg = +0.72 psig
104 kPa = +1.18 inHg = +0.58 psig
103 kPa = +0.89 inHg = +0.43 psig
102 kPa = +0.59 inHg = +0.29 psig
101 kPa = +0.30 inHg = +0.14 psig
100 kPa = -0.0 inHg = -0.00 psig
99 kPa = -0.30 inHg = -0.14 psig
98 kPa = -0.59 inHg = -0.29 psig
97 kPa = -0.89 inHg = -0.43 psig
96 kPa = -1.18 inHg = -0.58 psig
95 kPa = -1.48 inHg = -0.72 psig
94 kPa = -1.78 inHg = -0.87 psig
93 kPa = -2.07 inHg = -1.01 psig
92 kPa = -2.37 inHg = -1.16 psig
91 kPa = -2.66 inHg = -1.30 psig
90 kPa = -2.96 inHg = -1.45 psig
89 kPa = -3.26 inHg = -1.59 psig
88 kPa = -3.55 inHg = -1.74 psig
87 kPa = -3.85 inHg = -1.88 psig
86 kPa = -4.14 inHg = -2.03 psig
85 kPa = -4.44 inHg = -2.17 psig
84 kPa = -4.73 inHg = -2.32 psig
83 kPa = -5.03 inHg = -2.46 psig
82 kPa = -5.33 inHg = -2.61 psig
81 kPa = -5.62 inHg = -2.75 psig
80 kPa = -5.92 inHg = -2.90 psig
79 kPa = -6.22 inHg = -3.04 psig
78 kPa = -6.51 inHg = -3.19 psig
77 kPa = -6.81 inHg = -3.33 psig
76 kPa = -7.11 inHg = -3.48 psig
75 kPa = -7.40 inHg = -3.62 psig
74 kPa = -7.70 inHg = -3.77 psig
73 kPa = -7.99 inHg = -3.91 psig
72 kPa = -8.29 inHg = -4.06 psig
71 kPa = -8.59 inHg = -4.20 psig
70 kPa = -8.88 inHg = -4.35 psig
69 kPa = -9.18 inHg = -4.49 psig
68 kPa = -9.47 inHg = -4.64 psig
67 kPa = -9.77 inHg = -4.78 psig
66 kPa = -10.07 inHg = -4.93 psig
65 kPa = -10.36 inHg = -5.07 psig
64 kPa = -10.66 inHg = -5.22 psig
63 kPa = -10.96 inHg = -5.36 psig
62 kPa = -11.25 inHg = -5.51 psig
61 kPa = -11.55 inHg = -5.65 psig
60 kPa = -11.84 inHg = -5.80 psig
59 kPa = -12.14 inHg = -5.94 psig
58 kPa = -12.44 inHg = -6.09 psig
57 kPa = -12.73 inHg = -6.23 psig
56 kPa = -13.03 inHg = -6.38 psig
55 kPa = -13.32 inHg = -6.52 psig
54 kPa = -13.62 inHg = -6.67 psig
53 kPa = -13.92 inHg = -6.81 psig
52 kPa = -14.21 inHg = -6.96 psig
51 kPa = -14.51 inHg = -7.10 psig
50 kPa = -14.80 inHg = -7.25 psig
49 kPa = -15.10 inHg = -7.39 psig
48 kPa = -15.40 inHg = -7.54 psig
47 kPa = -15.70 inHg = -7.68 psig
46 kPa = -15.99 inHg = -7.83 psig
45 kPa = -16.28 inHg = -7.97 psig
44 kPa = -16.58 inHg = -8.12 psig
43 kPa = -16.88 inHg = -8.26 psig
42 kPa = -17.17 inHg = -8.41 psig
41 kPa = -17.47 inHg = -8.55 psig
40 kPa = -17.77 inHg = -8.70 psig
39 kPa = -18.06 inHg = -8.84 psig
38 kPa = -18.36 inHg = -8.99 psig
37 kPa = -18.65 inHg = -9.13 psig
36 kPa = -18.95 inHg = -9.28 psig
35 kPa = -19.25 inHg = -9.42 psig
34 kPa = -19.54 inHg = -9.57 psig
33 kPa = -19.84 inHg = -9.71 psig
32 kPa = -20.13 inHg = -9.86 psig
31 kPa = -20.43 inHg = -10.00 psig
30 kPa = -20.73 inHg = -10.15 psig
29 kPa = -21.02 inHg = -10.29 psig
28 kPa = -21.32 inHg = -10.44 psig
27 kPa = -21.61 inHg = -10.58 psig
26 kPa = -21.91 inHg = -10.73 psig
25 kPa = -22.21 inHg = -10.87 psig
24 kPa = -22.50 inHg = -11.02 psig
23 kPa = -22.80 inHg = -11.16 psig
22 kPa = -23.09 inHg = -11.31 psig
21 kPa = -23.39 inHg = -11.45 psig
20 kPa = -23.69 inHg = -11.60 psig
19 kPa = -23.98 inHg = -11.74 psig
18 kPa = -24.28 inHg = -11.89 psig
17 kPa = -24.58 inHg = -12.03 psig
16 kPa = -24.87 inHg = -12.18 psig
15 kPa = -25.17 inHg = -12.32 psig
14 kPa = -25.46 inHg = -12.47 psig
13 kPa = -25.76 inHg = -12.61 psig
12 kPa = -26.06 inHg = -12.76 psig
11 kPa = -26.35 inHg = -12.90 psig
10 kPa = -26.65 inHg = -13.05 psig
9 kPa = -26.94 inHg = -13.19 psig
8 kPa = -27.24 inHg = -13.34 psig
7 kPa = -27.54 inHg = -13.48 psig
6 kPa = -27.83 inHg = -13.63 psig
5 kPa = -28.13 inHg = -13.77 psig
4 kPa = -28.42 inHg = -13.92 psig
3 kPa = -28.72 inHg = -14.06 psig
2 kPa = -29.02 inHg = -14.21 psig
1 kPa = -29.31 inHg = -14.35 psig
0 kPa = -29.61 inHg = -14.50 psig



Where does the calculator go wrong? I have an app on my phone that comes up with the same answer.

18.92871914879627 inches of mercury.

Re: Holley Sniper 440 timing question [Re: Twostick] #2736357
01/25/20 01:37 AM
01/25/20 01:37 AM
Joined: Aug 2011
Posts: 2,842
Pattison Texas
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Originally Posted by Twostick
Originally Posted by csk
Originally Posted by Twostick
Originally Posted by Cab_Burge
How many inches of vacuum or pounds of manifold pressure is 64.1 KPA?


Just shy of 19.

http://www.kylesconverter.com/pressure/kilopascals-to-inches-of-mercury

Kevin

That conversion is not correct
This is what a automotive Vacuum gauge would read

Default MAP kPa to inHg (vacuum gauge) to PSIG

105 kPa = +1.48 inHg = +0.72 psig
104 kPa = +1.18 inHg = +0.58 psig
103 kPa = +0.89 inHg = +0.43 psig
102 kPa = +0.59 inHg = +0.29 psig
101 kPa = +0.30 inHg = +0.14 psig
100 kPa = -0.0 inHg = -0.00 psig
99 kPa = -0.30 inHg = -0.14 psig
98 kPa = -0.59 inHg = -0.29 psig
97 kPa = -0.89 inHg = -0.43 psig
96 kPa = -1.18 inHg = -0.58 psig
95 kPa = -1.48 inHg = -0.72 psig
94 kPa = -1.78 inHg = -0.87 psig
93 kPa = -2.07 inHg = -1.01 psig
92 kPa = -2.37 inHg = -1.16 psig
91 kPa = -2.66 inHg = -1.30 psig
90 kPa = -2.96 inHg = -1.45 psig
89 kPa = -3.26 inHg = -1.59 psig
88 kPa = -3.55 inHg = -1.74 psig
87 kPa = -3.85 inHg = -1.88 psig
86 kPa = -4.14 inHg = -2.03 psig
85 kPa = -4.44 inHg = -2.17 psig
84 kPa = -4.73 inHg = -2.32 psig
83 kPa = -5.03 inHg = -2.46 psig
82 kPa = -5.33 inHg = -2.61 psig
81 kPa = -5.62 inHg = -2.75 psig
80 kPa = -5.92 inHg = -2.90 psig
79 kPa = -6.22 inHg = -3.04 psig
78 kPa = -6.51 inHg = -3.19 psig
77 kPa = -6.81 inHg = -3.33 psig
76 kPa = -7.11 inHg = -3.48 psig
75 kPa = -7.40 inHg = -3.62 psig
74 kPa = -7.70 inHg = -3.77 psig
73 kPa = -7.99 inHg = -3.91 psig
72 kPa = -8.29 inHg = -4.06 psig
71 kPa = -8.59 inHg = -4.20 psig
70 kPa = -8.88 inHg = -4.35 psig
69 kPa = -9.18 inHg = -4.49 psig
68 kPa = -9.47 inHg = -4.64 psig
67 kPa = -9.77 inHg = -4.78 psig
66 kPa = -10.07 inHg = -4.93 psig
65 kPa = -10.36 inHg = -5.07 psig
64 kPa = -10.66 inHg = -5.22 psig
63 kPa = -10.96 inHg = -5.36 psig
62 kPa = -11.25 inHg = -5.51 psig
61 kPa = -11.55 inHg = -5.65 psig
60 kPa = -11.84 inHg = -5.80 psig
59 kPa = -12.14 inHg = -5.94 psig
58 kPa = -12.44 inHg = -6.09 psig
57 kPa = -12.73 inHg = -6.23 psig
56 kPa = -13.03 inHg = -6.38 psig
55 kPa = -13.32 inHg = -6.52 psig
54 kPa = -13.62 inHg = -6.67 psig
53 kPa = -13.92 inHg = -6.81 psig
52 kPa = -14.21 inHg = -6.96 psig
51 kPa = -14.51 inHg = -7.10 psig
50 kPa = -14.80 inHg = -7.25 psig
49 kPa = -15.10 inHg = -7.39 psig
48 kPa = -15.40 inHg = -7.54 psig
47 kPa = -15.70 inHg = -7.68 psig
46 kPa = -15.99 inHg = -7.83 psig
45 kPa = -16.28 inHg = -7.97 psig
44 kPa = -16.58 inHg = -8.12 psig
43 kPa = -16.88 inHg = -8.26 psig
42 kPa = -17.17 inHg = -8.41 psig
41 kPa = -17.47 inHg = -8.55 psig
40 kPa = -17.77 inHg = -8.70 psig
39 kPa = -18.06 inHg = -8.84 psig
38 kPa = -18.36 inHg = -8.99 psig
37 kPa = -18.65 inHg = -9.13 psig
36 kPa = -18.95 inHg = -9.28 psig
35 kPa = -19.25 inHg = -9.42 psig
34 kPa = -19.54 inHg = -9.57 psig
33 kPa = -19.84 inHg = -9.71 psig
32 kPa = -20.13 inHg = -9.86 psig
31 kPa = -20.43 inHg = -10.00 psig
30 kPa = -20.73 inHg = -10.15 psig
29 kPa = -21.02 inHg = -10.29 psig
28 kPa = -21.32 inHg = -10.44 psig
27 kPa = -21.61 inHg = -10.58 psig
26 kPa = -21.91 inHg = -10.73 psig
25 kPa = -22.21 inHg = -10.87 psig
24 kPa = -22.50 inHg = -11.02 psig
23 kPa = -22.80 inHg = -11.16 psig
22 kPa = -23.09 inHg = -11.31 psig
21 kPa = -23.39 inHg = -11.45 psig
20 kPa = -23.69 inHg = -11.60 psig
19 kPa = -23.98 inHg = -11.74 psig
18 kPa = -24.28 inHg = -11.89 psig
17 kPa = -24.58 inHg = -12.03 psig
16 kPa = -24.87 inHg = -12.18 psig
15 kPa = -25.17 inHg = -12.32 psig
14 kPa = -25.46 inHg = -12.47 psig
13 kPa = -25.76 inHg = -12.61 psig
12 kPa = -26.06 inHg = -12.76 psig
11 kPa = -26.35 inHg = -12.90 psig
10 kPa = -26.65 inHg = -13.05 psig
9 kPa = -26.94 inHg = -13.19 psig
8 kPa = -27.24 inHg = -13.34 psig
7 kPa = -27.54 inHg = -13.48 psig
6 kPa = -27.83 inHg = -13.63 psig
5 kPa = -28.13 inHg = -13.77 psig
4 kPa = -28.42 inHg = -13.92 psig
3 kPa = -28.72 inHg = -14.06 psig
2 kPa = -29.02 inHg = -14.21 psig
1 kPa = -29.31 inHg = -14.35 psig
0 kPa = -29.61 inHg = -14.50 psig



Where does the calculator go wrong? I have an app on my phone that comes up with the same answer.

18.92871914879627 inches of mercury.


Not sure, what I posted is off the Holley forum, it also matches my vacuum gauge.


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: Holley Sniper 440 timing question [Re: Twostick] #2736358
01/25/20 01:52 AM
01/25/20 01:52 AM
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Originally Posted by Twostick
Originally Posted by Cab_Burge
How many inches of vacuum or pounds of manifold pressure is 64.1 KPA?


Just shy of 19.

http://www.kylesconverter.com/pressure/kilopascals-to-inches-of-mercury

Kevin


That is the conversion to pressure. Cab asked about vacuum. 64 kPa is 18 inches of pressure or 12 inches of vacuum.

Re: Holley Sniper 440 timing question [Re: Spyphish] #2736359
01/25/20 01:54 AM
01/25/20 01:54 AM
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Originally Posted by Spyphish
So I have got a lot of info from this thread. Do I need a Holley special cable to hook to the computer or a regular USB. Thanks


The Holley cable is CAN on one end and USB on the other end. I don't think you can buy that cable from anyone other than Holley but I might be wrong. CAN to USB is an odd duck, you aren't going to find it in a local Radio Shack but you might be able to order one online. I wouldn't risk it myself, just order the Holley cable even though it is expensive.

Re: Holley Sniper 440 timing question [Re: AndyF] #2736426
01/25/20 10:18 AM
01/25/20 10:18 AM
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Spyphish Offline OP
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So I have the car running 10 start, 15 idle, 42 cruise and 35 WOT. Holley cable on the way and free software is on this laptop. When cable gets here hook it all up and start driving. NOW how do I "know" what it likes. For instance cruise as we adjust timing what do we look for,max Kpa reading? Thanks

These are dumb questions but all I know is SS/AH holley 600 vac secondary wide open for 8 seconds. Phish


CALMED THE QUAKE!!!(AGAIN!)
Re: Holley Sniper 440 timing question [Re: AndyF] #2736444
01/25/20 11:24 AM
01/25/20 11:24 AM
Joined: May 2003
Posts: 6,545
Downtown Roebuck Ont
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Originally Posted by AndyF
Originally Posted by Twostick
Originally Posted by Cab_Burge
How many inches of vacuum or pounds of manifold pressure is 64.1 KPA?


Just shy of 19.

http://www.kylesconverter.com/pressure/kilopascals-to-inches-of-mercury

Kevin


That is the conversion to pressure. Cab asked about vacuum. 64 kPa is 18 inches of pressure or 12 inches of vacuum.


A large detail I missed... confused laugh2

Thanks.

Kevin

Re: Holley Sniper 440 timing question [Re: Twostick] #2736468
01/25/20 12:20 PM
01/25/20 12:20 PM
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Originally Posted by Twostick
Originally Posted by AndyF
Originally Posted by Twostick
Originally Posted by Cab_Burge
How many inches of vacuum or pounds of manifold pressure is 64.1 KPA?


Just shy of 19.

http://www.kylesconverter.com/pressure/kilopascals-to-inches-of-mercury

Kevin


That is the conversion to pressure. Cab asked about vacuum. 64 kPa is 18 inches of pressure or 12 inches of vacuum.


A large detail I missed... confused laugh2

Thanks.

Kevin



Originally Posted by Danny Cabral
Use conversion factor of .2953/29.53 @ 32°F or .2961/29.61 @ 60°F air temperature.
Convert MAP kPa to inHg (vacuum gauge): MAP kPa x .2961 − 29.61 = inHg Vacuum Gauge

Convert MAP kPa to psig (gauge): MAP kPa x .145 − 14.5 (slightly above sea level) = PSIG
Convert MAP kPa to psia (absolute with atmosphere): MAP kPa x .145 = PSIA

With PSIG, negative numbers are vacuum, and positive numbers are pressure.
With PSIA, all numbers are positive. The Holley EFI software uses kPa & PSIG.

The Holley EFI software uses kPa or PSIG (not PSIA). Here's an excellent pressure conversion calculator:

Last edited by csk; 01/25/20 12:24 PM.

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: Holley Sniper 440 timing question [Re: CSK] #2736482
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I skip all the math and just do it in my head. kPa is roughly a 0 to 100 scale. So 50 kPa is in the middle of the scale. Vacuum is 0 to 30 inches of hg. Middle of the scale is 15 inches of vacuum. So 50 kPa is 15 inches of vacuum. Once you know that you can figure out the rest.

Re: Holley Sniper 440 timing question [Re: Spyphish] #2736485
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Originally Posted by Spyphish
So I have the car running 10 start, 15 idle, 42 cruise and 35 WOT. Holley cable on the way and free software is on this laptop. When cable gets here hook it all up and start driving. NOW how do I "know" what it likes. For instance cruise as we adjust timing what do we look for,max Kpa reading? Thanks

These are dumb questions but all I know is SS/AH holley 600 vac secondary wide open for 8 seconds. Phish


First thing to do is to get the car running and warm up the engine so you can work on the hot idle. Once you have the engine warm you adjust the idle settings just like you would a carb. Slowly drop the idle speed and see how it does. Play with the ignition timing to see what it likes. Adjust the AFR to see what it likes. Adjust the throttle position to get the IAC into the correct location. It is exactly how you tune a carb engine except you don't have to change jets and mess with the distributor springs. You can do it all on the laptop by changing the values in the tables.

There are a bunch of Holley tuning videos on youtube so I'd suggest starting there if this is all new to you. It is like anything else. Once you know how to do it it is very simple but when you don't know how to do it it is intimidating. Watching a few videos will get you comfortable with the process of paging thru the menu and opening up the tables and stuff like that.

Re: Holley Sniper 440 timing question [Re: Spyphish] #2736489
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Originally Posted by Spyphish
So I have the car running 10 start, 15 idle, 42 cruise and 35 WOT. Holley cable on the way and free software is on this laptop. When cable gets here hook it all up and start driving. NOW how do I "know" what it likes. For instance cruise as we adjust timing what do we look for,max Kpa reading? Thanks

These are dumb questions but all I know is SS/AH holley 600 vac secondary wide open for 8 seconds. Phish


You aim for minimum kPa when tuning. kPa is pressure. You want to aim for maximum vacuum which is the opposite of pressure. Your idle pressure should be around 50 kPa on a well tuned engine with a modest performance cam in it. That is 15 inches of vacuum. A race car might idle at 70 kPa while a car with a stock cam will idle at 40 kPa. When you adjust the timing and/or the idle AFR you shoot for lower kPa. The other way to do it is to watch the IAC position. The IAC controls the idle air flow so what you want to do observe what is happening to the IAC position as you adjust the timing and the AFR.

Re: Holley Sniper 440 timing question [Re: AndyF] #2736695
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On the IAC setting I like to get it at about 5 to 15 steps at idle with a warmed up eng in park. The steps will pick up a little in gear with an auto. You can adjust the throttle to set the IAC but you have to have timing at idle and all other settings set. If the IAC is at say 45 steps at warm idle you can turn the throttle blade open a bit more and watch the IAC steps come down. You don't want the IAC steps at 0 with a warm eng in park because then it may not catch the idle fast enough when you let off the gas since it can go to 0 steps. Once you set the throttle and the IAC then when you shut the eng off and restart it the controller will see the new TBS volts as idle since the TBS volts will change if you change throttle blade opening. Ron

Re: Holley Sniper 440 timing question [Re: 383man] #2736717
01/26/20 09:58 AM
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My cable gets here Tuesday. Great info guys...


CALMED THE QUAKE!!!(AGAIN!)
Re: Holley Sniper 440 timing question [Re: AndyF] #2736889
01/26/20 08:31 PM
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Originally Posted by AndyF
I skip all the math and just do it in my head. kPa is roughly a 0 to 100 scale. So 50 kPa is in the middle of the scale. Vacuum is 0 to 30 inches of hg. Middle of the scale is 15 inches of vacuum. So 50 kPa is 15 inches of vacuum. Once you know that you can figure out the rest.


BINGO

Re: Holley Sniper 440 timing question [Re: Mopar_Rich] #2737170
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I saved the ECU file to the SD card and it shows 4150_4_ZAA.sniper. The laptop sees it but not the V5 software, it will not recognize that file type. Guess I need to download the instructions. Phish


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Re: Holley Sniper 440 timing question [Re: Spyphish] #2737207
01/27/20 07:22 PM
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Your statement about V5 software leads me to believe that you loaded the wrong software on your computer. Delete the V5 software and load the Sniper software. You do not want to mix and match those two. Bad things will happen. I destroyed a $2000 Holley Dominator ECU by accidentally loading the wrong software on to it.

Re: Holley Sniper 440 timing question [Re: AndyF] #2737250
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Originally Posted by AndyF
Your statement about V5 software leads me to believe that you loaded the wrong software on your computer. Delete the V5 software and load the Sniper software. You do not want to mix and match those two. Bad things will happen. I destroyed a $2000 Holley Dominator ECU by accidentally loading the wrong software on to it.


This is a brand new engine so 1. I think your right on software, I am clueless. 2. I will (use the Wizard) and take it somewhere that has done this, probably not local. Stephen


CALMED THE QUAKE!!!(AGAIN!)
Re: Holley Sniper 440 timing question [Re: Spyphish] #2737331
01/28/20 05:11 AM
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I downloaded the Sniper software from Holley and was able to view the file I saved from the SD card out of the car. The spark graph was very "boxy" so I hit the smooth key about 3 times and saved it. Is that it? Stick it back in the car and run it? Thanks


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Re: Holley Sniper 440 timing question [Re: Spyphish] #2737414
01/28/20 12:59 PM
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Now you're rolling. Yes, you can smooth the timing map by hitting the smooth button a few times and then drive it. Maybe snap a picture of what the timing map looks like and post it on here. There is also a graph function on that table so you can view it graphically. There is a little rotation bar at the bottom of the picture so you can rotate the graph to look at it. What you want is a nice smooth graph without any sharp peaks or ledges or cliffs.

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