Ignition timing map

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Ignition timing map

Unread postby wyoung369 » Thu Aug 10, 2017 10:56 am

So, I apologize in advance if I'm posting this in the wrong section. I'm new to the forum. Based on a few things I could find, this seemed like a forum where some people could potentially answer my question. I am. In the process of a vh45 swap into a 91 240sx. The engine is going to be managed by megasquirt 3 with ms3x. Now, my issue becomes that while I know the base ignition timing for the vh45 (15 degrees) I have zero clue what the factory curve is and can't seem to find anything on the subject. Now I can provide a good deal of information about the motor to anyone willing to help me get a start. The vehicle will be dyno tuned once my clutch is broken in and things like that so I'm not looking for anything final. Just something that will get me started on my drivability tuning on the road. The engine will be run on Pulp gas with the intention of using water methanol to cool the air charge. Can anyone help? Again I can provide details on the motor that could be helpful. I know a lot has to be considered about a motor to come up with things like this
wyoung369
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Joined: Thu Aug 10, 2017 8:08 am
Name: William Young
Vehicle Information: 91 240sx vh45 swap with ms3x engine control

Re: Ignition timing map

Unread postby decipha » Thu Aug 10, 2017 11:10 am

welcome to the forum

yea post your fuel octane, CR, head specs, cam specs, etc...
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decipha
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
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Re: Ignition timing map

Unread postby wyoung369 » Thu Aug 10, 2017 1:12 pm

Bore/stroke- 93x82.7mm (3.66/3.256in)
10.2:1 Compression Ratio
Camshafts:

Inlet:
Lift = 9.9mm
Duration = 248°
IVO 0° BTDC IVC 68° BTDC
38mm diameter

Ex:
Lift = 9.9mm
Duration = 248°
EVO 60° BBDC ECV 8°ATDC
32mm diameter
Rod
*bushed small end, with forced pin oiling and a piston oil squirter on rod*
Length (center of bigend to center of small end) = 5.8"
Big end width = .865"
Small end width = .700"
Big end bore = 2.160"
Head

Intake valve head size = 1.501" / 38.15mm (no oversize possible w/o shrouding)
Exhaust valve head size = 1.300" / 33mm (oversize possible)
Rocker ratio = 1.6
Exhaust camshaft base circle = 1.175"
Exhaust camshaft total circle at centerline = 1.392"
Exhaust camshaft lobe lift = .217"
Exhaust valve lift w/ 1.6 rockers = .347"

Valve stem seals (SBI part numbers, viton, metal clad style)
Intake:
90-95 = 122-1239
96 = 122-1264
Exhaust:
90-96 = 122-1159
combustion chamber cc (determined by math by someone else) 51
i would like to be safe on 87 with the water methanol with my intention being using 91-93 (depending on availability)
wyoung369
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Posts: 4
Joined: Thu Aug 10, 2017 8:08 am
Name: William Young
Vehicle Information: 91 240sx vh45 swap with ms3x engine control

Re: Ignition timing map

Unread postby wyoung369 » Wed Aug 16, 2017 1:19 pm

Anybody?
wyoung369
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Posts: 4
Joined: Thu Aug 10, 2017 8:08 am
Name: William Young
Vehicle Information: 91 240sx vh45 swap with ms3x engine control

Re: Ignition timing map

Unread postby decipha » Wed Aug 16, 2017 4:35 pm

i asked someone who was suose to have skme experiwnce and they never replied back

all i was told is that they dont like a whole lot

me personally id shoot 20 to it at wot pull the plugs and go from there
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decipha
Tooner
 
Posts: 13360
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Ignition timing map

Unread postby wyoung369 » Thu Aug 17, 2017 5:25 am

That's pretty much the plan. I just needed somewhere to start that I knew would be safe so that I could drive around for the amount of time needed to break in the clutch and things like that before I can really do any full throttle pulls. Would you guess that 20 is safe?
wyoung369
General Poster
 
Posts: 4
Joined: Thu Aug 10, 2017 8:08 am
Name: William Young
Vehicle Information: 91 240sx vh45 swap with ms3x engine control


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