Damn screws - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-20-2007, 04:49 PM   #11
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ok, I did take it to my friends work to put it on a flow bench. the results where 526 cfm @1.5hg on a flowbench1200. that was before any work I have done, I will take it back when I am done to get the new results. will my pcm learn to adjust for the increase in airflow?
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Old 10-20-2007, 04:54 PM   #12
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well that what i have in number so far

stock L36 post= 400 cfm
same whit no screen =440 cfm
stock postless L36= 525 cfm


these are from speedster400
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Old 10-20-2007, 05:01 PM   #13
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I am familiar with that post. agrazela, 95naSTA, and you are the 3 I pay attention to the most. as we all have the same engine and I know the 3 of you know what your doing
So I guess what I need to know is will my pcm relearn or do I need to take it somwhere and get it recalibrated? Good news is Dynospeed racing is less than a mile from my house.
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Old 10-20-2007, 05:01 PM   #14
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Quote:
will my pcm learn to adjust for the increase in airflow?
im not sure about youre PCM you have the OBD1.5 but the OBD 2 need tuning
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Old 10-20-2007, 05:15 PM   #15
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My car is a 96, I think it is OBD2

Confirmed:Emissions sticker under the hood says it is OBD2 compliant.
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Old 10-20-2007, 05:36 PM   #16
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Quote:
Originally Posted by roadtech195
My car is a 96, I think it is OBD2

Confirmed:Emissions sticker under the hood says it is OBD2 compliant.
Yes you are OBD2, and most likely you will need tuning

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Old 10-20-2007, 06:10 PM   #17
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Here'* the basics. Your maf sensor see'* X amount of air. The new maf will see roughly that same X amount of air. In reality your flowing much more air than your PCM is reading from the sensor because it was tuned for a TB that only flows 400 cfm.

This causes your PCM to rely on the O2 in the exhaust to show the lean condition. The PCM then adjusts your fuel trims and learns them. However..it keeps adjusting the trim... how much room do you have before it can not adjust any further? Also.. if your fuel trim is high..then you are not tuned properly and your PCM probably has a problem calculating load and all other parameters than make your car run better, smoother and faster while maintaining a safe margin for error.
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Old 10-20-2007, 07:43 PM   #18
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I noticed the ZZ performance stage 1 tb says nothing about needing tuning. nvm its for 97 and up. I noticed that my 96 tb has 2 vacc ports. one for evap, and one for the regulator and tranny. IIRC 96 was the last year for vacc controled trannys . so in addition to retuning my pcm, I would also need to drill out a vacc port and put in a tee.
This has turned out to be not so simple anyone got a SSEi for sale?
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Old 10-20-2007, 08:34 PM   #19
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I know on my 97, there is a difference from the 97 to the 99 tb. (tuning wise) There needs to be tuning when ever you change sensors or flow rates.
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