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View Full Version : 86 T1 auto boost cut?


ShadowFromHell
10-14-2007, 09:35 PM
Hey guys, Ive got a 86 chrysler Ny and I installed a MBC on it today. The car has no boost gauge, no air fuel gauge, or a tach. But, before you yell at me I had my OTC 2000 plugged into it and was monitoring the boost, and knock with that :)

So I installed it and had trouble getting it over 40 KPA (6psi). Finally got the MBC installed and it was over boosting around 55kpa (8psi). I switched to monitor the map sensor's volt output and cutout seemed to hit at 4.2 volts. Its been awhile since I installed a OBE on a TC but 4.2 sounds about right. So is the KPA reading wrong or is the boost cut lower on the older TD's?

thanks
Dustin
GLHNSLHT2
10-14-2007, 09:56 PM
heh, convert to 87 T2 and you can have my 14.3 cal :)
cordes
10-14-2007, 11:17 PM
It should not be cutout no matter what cal it is. Those cars ran 7PSI stock, so a cutout of 8PSI would be a nightmare, as it would inevitably spike from time to time. I think a decent boost gauge is in order.
GLHNSLHT2
10-14-2007, 11:32 PM
codes?
ShadowFromHell
10-15-2007, 01:04 AM
Its throwing code 22 and 45. So it is cutting out. I really doubt that it is cutting out at 8 psi. Im thinking 4.2 must be the cutout on the older ECU's. I read on TDG that 4.3 is the cutout so T2's so it must be close.


GLHNSLHT2 How much do you want for it? Im beginning to think a HG swap is in order soon, and I might as well swap to a T2 setup while it is apart. (Im also thinking of swaping to 84 rods and pistons, but thats for another thread, lol).
GLHNSLHT2
10-15-2007, 11:50 PM
I don't know, $50 maybe.
ShadowFromHell
10-16-2007, 01:07 AM
what comp is it exactly? stock 87 t2 or mp or? Im def intrested. The HG is on its way out.
GLHNSLHT2
10-16-2007, 09:28 PM
it's a custom cal based on the stock calibration. OB is turned off, factory boost set for 14.5psi (highest you can set it) I ramped up the boost curves too. Right now it's tuned for FFV injectors but I can easily have it cal'ed for stockers or whatever. I need to redo the fan schedules anyway. They're not right and the fan turns on at 160 and never turns off right now. Easy fix though.
minigts
10-16-2007, 09:32 PM
Boost cut out on the T1 (for my 85 Charger and my friends 86 Laser) was around 12 psi.