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Microtech tuning when cold out

Old 12-01-05, 02:57 AM
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tuning when cold out

Ok I tried to start my damn car but it wont start. the microtech reads 0 celsius air temp. I tried unflooding procedure and nothing. I took out my plugs, cranked to get the gas out, and cleaned/put the plugs back in. still cant get her to start. The crank values i kept from the base map since i have stock primaries. and the af_ste is stock also @ +8%. at those settings the injectors during crank are like 12ms. Should it be that high?
Anyone else have tips for "cold" tuning the car?

87 tii
Stock block 13b-re
60 trim turbo w/ .96 ar
550/1600 injectors
3" exhaust
huge intercooler.
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Old 12-01-05, 03:00 AM
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btw this happens even when its not that cold out. but if I throttle it at just the right moment, I can rev her out until she idles on its own.
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Old 12-07-05, 09:17 PM
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ok this really sucks. My car won't start in the cold anymore. what should injector MS be during start up? and what should the water temp/crank maps look like in cold temps? It is set to stock right now due to the fact I have stock primaries.
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Old 12-12-05, 05:42 PM
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Originally Posted by RexRyder
ok this really sucks. My car won't start in the cold anymore. what should injector MS be during start up? and what should the water temp/crank maps look like in cold temps? It is set to stock right now due to the fact I have stock primaries.
you should PM 10 sec rx7, hes very knowledgeable when it comes to this stuff, he should be able to give you a hand
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Old 12-12-05, 10:44 PM
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so there was lots of gas in the chambers?

reduce your crank and water settings at 0deg, you will probably want about 45-50% in the water, keep reducing the crank until it fires up nicley,

another trick is to put a set of hot plugs in it until you get it sorted, i usually use NGK B7em for cold starting when crank and water settings are not right,
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Old 12-12-05, 11:28 PM
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yea everytime I want to start i gotta pull the plugs, crank out the gas, and clean the plugs a little bit. I am getting low 10 AFR's under boost, and I'm thinking that could be fouling out my plugs prematurely. (the plugs are not even a month old with less than 500 miles on them). Anyway I'll try adjust the crank/water settings. One more question: should the injector st (or ms) before cranking be in the red part: 12.14 ms. I tried messing with the af_ste setting and it seems to be directly related to the injector ms before start. any other info is greatly appreciated. thanks!
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Old 12-26-05, 05:07 PM
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12ms before cranking when cold? thats your problem your injectors are wide open... im sure that would cause hard starting and foul your plugs, low 10's af under boost is fine u want 10-11.5.


Adjust your water temp settings, and that should help you
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Old 01-03-06, 03:15 AM
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Originally Posted by RexRyder
yea everytime I want to start i gotta pull the plugs, crank out the gas, and clean the plugs a little bit. I am getting low 10 AFR's under boost, and I'm thinking that could be fouling out my plugs prematurely. (the plugs are not even a month old with less than 500 miles on them). Anyway I'll try adjust the crank/water settings. One more question: should the injector st (or ms) before cranking be in the red part: 12.14 ms. I tried messing with the af_ste setting and it seems to be directly related to the injector ms before start. any other info is greatly appreciated. thanks!
Make sure your tps is cal.. Cus you might be runing on the load map...
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Old 01-05-06, 01:32 PM
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had the same problem last week been starting no problems but that was when I had intake temps at 20c but last week intake temps were -2c and injectors at 12.14ms when cranking.

from what has been said this seems way too much !

I will change this at the weekend and see if it starts !

REXRYDER - have you changed your settings and if so did it work ???
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Old 01-05-06, 03:43 PM
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Yes I changed the crank settings, and water temp settings.
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Old 01-05-06, 03:46 PM
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OMG I have the same problem I though that my engine need it a rebuilt or something like that.

What did you change to fix it I have never tunned my mt8s Somebody else did it can some one walk me through in what to do to fix this
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Old 01-05-06, 05:46 PM
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Originally Posted by PoderRotativo
OMG I have the same problem I though that my engine need it a rebuilt or something like that.

What did you change to fix it I have never tunned my mt8s Somebody else did it can some one walk me through in what to do to fix this
If I get my going I will let you know what I did

REXRYDER - did you not change the ms time on the injectors then ?
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Old 01-07-06, 05:05 PM
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yes in the options screen where you change the mixtrim theres the af ste option or some **** like that, and I turned the % down like 5-8 points and that has direct relation to the injector MS during crank up.
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Old 01-07-06, 07:55 PM
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HeY Rexrider can you explain me what exactly you changed and how did you do it please
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Old 01-08-06, 10:56 PM
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I lowered the settings on the water temp and crank maps. just go out when its cold and look at what temps the Microtech is telling you then lower the fuel at those temps. if you are on the stock map then you need to lower it hella. start out with 5-8 points tho first, then smooth out the graphs n ****.
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Old 01-12-06, 09:11 PM
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Thnks for the info Im not running stock map I got it tunned by a guy from CT
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Old 01-15-06, 05:50 PM
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so if you change the opttrim it will change the 12.14st injector opening time? My car has the exact same problem and keeps flooding out. Should I keep leaning it out?
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Old 01-16-06, 11:09 AM
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follow rexryders instructions I lowered the af ste in the options screen and then lowered the air t ,water t and crank at the relevant temps.

then I just had a big grin on my face when she fired up

thanks for the advice rexryder
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Old 01-17-06, 02:06 PM
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Talking jeyjey

Is yours really the fastest??

John
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Old 01-25-06, 11:36 AM
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Originally Posted by Jon Goodwin
Is yours really the fastest??

John
as far as I know - If you know of one quicker I stand to be corrected
(does not include 20b transplants - is road legal)

Last edited by jeyjey; 01-25-06 at 11:43 AM.
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Old 01-31-06, 11:38 AM
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Originally Posted by Spooledup300z
12mS before cranking when cold? thats your problem your injectors are wide open...
What mS should we be seeing during cold weather cranking?
-a
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