ST3500 and Ltrims?
Thread Starter
TECH Apprentice
Joined: Nov 2001
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From: Humble,Tx
ST3500 and Ltrims? How many of you guys and gals have ported MAF's and are running a ST3500? I have been playing around with my Ltrims (quit laughing) to see if I could cure the problem and I think I have it licked. What are your experiences with Ltrims and converters?
Thanks
Steve <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
Thanks
Steve <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
Re: ST3500 and Ltrims? Converters do not affect L-Trims. If you have a ported MAF and had your battery disconnected when your converter was installed, it's going to take 50-200 miles before your computer gets the L-Trims back where they need to be. That's not the converter's fault...it's wiping out the pcm memory's fault. L-Trims will start back at 0% after battery disconnection or PCM reset and will gradually go to the 10-20% positive L-Trims that occur when running a ported MAF.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Re: ST3500 and Ltrims? The converter does not effect LTRIMs, but LTRIMs effect the converter. I have been able to effect how well lock-up works by changing LTRIMs with a MAFT.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.
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From: Deep in the seedy underworld of Koonerville
Re: ST3500 and Ltrims? [quote]Originally posted by Ragtop 99:
<strong>The converter does not effect LTRIMs, but LTRIMs effect the converter. I have been able to effect how well lock-up works by changing LTRIMs with a MAFT.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.</strong><hr></blockquote>
I absolutely agree with this. I had lock-up problems with my Y3200. I changed my GMAF back to the stock MAF and no more lock-up problems. <img src="gr_stretch.gif" border="0">
<strong>The converter does not effect LTRIMs, but LTRIMs effect the converter. I have been able to effect how well lock-up works by changing LTRIMs with a MAFT.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.</strong><hr></blockquote>
I absolutely agree with this. I had lock-up problems with my Y3200. I changed my GMAF back to the stock MAF and no more lock-up problems. <img src="gr_stretch.gif" border="0">
Launching!
Joined: Dec 2001
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From: North Tonawanda - New York
Re: ST3500 and Ltrims? [quote]Originally posted by Ragtop 99:
<strong>The converter does not effect LTRIMs, but LTRIMs effect the converter. I have been able to effect how well lock-up works by changing LTRIMs with a MAFT.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.</strong><hr></blockquote>
Joel, are you going to give us the magic MAFT settings to help our ST3500's lockup and shift better
<img src="images/icons/confused.gif" border="0">
<strong>The converter does not effect LTRIMs, but LTRIMs effect the converter. I have been able to effect how well lock-up works by changing LTRIMs with a MAFT.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.</strong><hr></blockquote>
Joel, are you going to give us the magic MAFT settings to help our ST3500's lockup and shift better
<img src="images/icons/confused.gif" border="0">
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 317
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From: Humble,Tx
Re: ST3500 and Ltrims? [quote] Converters do not affect L-Trims. <hr></blockquote>
I am sorry if you misunderstood me guys. I meant [quote]The converter does not affect LTRIMs, but LTRIMs affect the converter. I have been able to effect how well lock-up works by changing LTRIMs with a MAFT.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.
<hr></blockquote>
I have my Ltrims averaging about 9 now and all the problems associated with the ST3500 and now gone. I was just wondering if anyone has had the same effect. Thanks for the replies.
Steve <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
I am sorry if you misunderstood me guys. I meant [quote]The converter does not affect LTRIMs, but LTRIMs affect the converter. I have been able to effect how well lock-up works by changing LTRIMs with a MAFT.
Ported MAFs can effect LTRIMs and the preceived load seen by the computer. This is in turn can effect line pressure and also can effect when the computer calls for lock-up versus unlock.
<hr></blockquote>
I have my Ltrims averaging about 9 now and all the problems associated with the ST3500 and now gone. I was just wondering if anyone has had the same effect. Thanks for the replies.
Steve <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />
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From: Live Oak, FL - in the woods where the creatures lurk.
Re: ST3500 and Ltrims? Interesting. My cruise Lterms vary somewhat negative, but eventually go to 0. My WOT lterms are usually zero also. I have had no lockup or code problems.
BTW I'm running stock, screened MAF.
[ December 20, 2001: Message edited by: gwj ]</p>
BTW I'm running stock, screened MAF.
[ December 20, 2001: Message edited by: gwj ]</p>
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Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 317
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From: Humble,Tx
Re: ST3500 and Ltrims? I know that there are different opnions on Ltrms but the point that I am trying to make is that maybe cars with ported MAFs doint like Ltrms that are around 0ish. I have raised my Ltrms and now all the problems are gone.
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