9th injector and ARAP bin
Thread Starter
Senior Member
Joined: Dec 2001
Posts: 520
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From: Amarillo, Tx
Car: 1986 Z28
Engine: 355TPI 380hp
Transmission: Rebuilt 700r w/ Transgo Shift Kit
9th injector and ARAP bin
I'm in the process of doing a ARAP bin for my 86 355 TPI. Anyway, I've done a search and found that certain things needed to be changed to use this bin on pre-89 MAF systems. But I'm concerned about the 9th injector. I know you can just unplug it, but I just hate to change the way she starts right now. Correct me if I'm wrong, but doesn't the 9th injector run seperate from the ECM? For arguementative (?SP) purposes, could you set all crank pw multipliers vs. Ref. Pulse to 0 and let the cold start injector do what it is supposed to? Also, is the cold start injector entirely seperate from the ECM?
Member
Joined: Nov 2003
Posts: 299
Likes: 0
From: The Netherlands
Car: Cobra Kit Car
Engine: 350 HSR
Transmission: TKO 600
Axle/Gears: 3.31
The mask $6E don’t have the cold start injector.
So if you decided to change to the ARAP you need normally to disconnect the 9th injector.
But as you say you can live the injector in position because it is not controlled by the ECM, just a Temp sensor.
I have a very good experience with out the CSI by just control the “crank pw multipliers vs. Ref. Pulse”
This will solve the problem that some times you get with a $6E (hard to start)
In case that you decide to remove the CSI here are my settings.
My car will start writhing 1.2 sec. see my data logging:
http://www.donostia.demon.nl/csv.zip
My “crank pw multipliers vs. Ref. Pulse” is:
Regards,
Cobra289
So if you decided to change to the ARAP you need normally to disconnect the 9th injector.
But as you say you can live the injector in position because it is not controlled by the ECM, just a Temp sensor.
I have a very good experience with out the CSI by just control the “crank pw multipliers vs. Ref. Pulse”
This will solve the problem that some times you get with a $6E (hard to start)
In case that you decide to remove the CSI here are my settings.
My car will start writhing 1.2 sec. see my data logging:
http://www.donostia.demon.nl/csv.zip
My “crank pw multipliers vs. Ref. Pulse” is:
Code:
Crank Fuel PW Multiplier vs. Ref. Pulse
Ref. Pulse Multiplier
24 0.20
23 0.20
22 0.20
21 0.20
20 0.20
19 0.20
18 0.20
17 0.20
16 0.25
15 0.25
14 0.25
13 0.25
12 0.25
11 0.25
10 0.50
9 0.50
8 0.25
7 0.25
6 0.25
5 0.25
4 1.00
3 0.25
2 0.30
1 0.30 Cobra289
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Joined: Oct 2003
Posts: 302
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From: Houston / The Woodlands, TX
Car: 82 ElCamino, looking for a 3rd gen
Engine: 305 TPI(427SB in progress) 730 $8D
Transmission: THM350 (Getting a 4L80E soon)
Axle/Gears: 10 Bolt w/ 2.43 gears :(
The cold start uses a switch that supplies the 9th injector power while in the crank position under a certain coolant temp. The system doesn't tie into the ECM system at all. Unplug the injector and/or the switch and cover/protect the exposed plugs. You may or may not have to adjust the cranking PW's and multipliers vs. reference pulses to get it to start the way you want it to.
Member
Joined: Nov 2003
Posts: 299
Likes: 0
From: The Netherlands
Car: Cobra Kit Car
Engine: 350 HSR
Transmission: TKO 600
Axle/Gears: 3.31
I forgot to mention that I think you need also zero the “Crank Fuel PW vs. Coolant Temp”
My “Crank Fuel PW vs. Coolant Temp” is:
Regards,
Cobra289
My “Crank Fuel PW vs. Coolant Temp” is:
Code:
Crank Fuel PW vs. Coolant Temp
Deg F PW (msec)
241 18.75
219 18.75
198 17.19
176 17.19
154 15.63
133 14.06
111 14.06
90 14.06
68 15.63
46 25.00
25 35.16
3 75.00
-18 139.85
-40 160.17
There is also a
“Crank Fuel PW vs. TPS”
% TPS Multiplier
100 0.00
87.5 0.00
75.0 1.00
62.5 1.00
50.0 1.00
37.5 1.00
25.0 1.00
12.5 1.00
0 1.00 Cobra289
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