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#41 | |
![]() Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Clutch also had a vacuum port make. Good luck. Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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#42 | |
![]() Join Date: Oct 2004
Posts: 1,889
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I don't recall converter choice either but the more involved the "sorting out" becomes it seems it wasn't thought out particularly well from the start. Hate to say that but it's becoming quite evident! I believe if I were in the situation and had something else to drive I'd "lawyer up" with your documentation and performance trail of the shop and attempt a recovery of all "labor charges" or a court ordered commitment that they'd be responsible for funds required to correct the install. You're in the same state as the shop which is a plus I'd think but I'd chase the money maybe first. If I could get on a court docket soon I believe it's something I would consider - I'm guessing you know a couple! Last edited by WVZR-1; 01-23-2013 at 04:11 AM. |
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#43 | |
![]() Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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4l80e= 0.75:1 The only GM 4 speed auto to run a 0.67:1 OD is the 200R4 trans. IMO The 200r4 has teh best ratios for acceleration AND low cruise rpm. I prefer the higher 1st gear of the 200 as there is less rpm drop upon upshift into 2nd. Quite often the large ratio difference of the 60e family pulls revs down out of teh powerband, esp with stock stall torque converters. The newer 6l80e/90e transmissions are even worse for rpm drop during upshifts than the 4l60e family. The 2.74:1 1st gear, 1.57:1 2nd 1:1 4rd and 0.67:1 OD 4l60e 3.06:1 1st, 1.62:1 2nd, 1:1 3rd and 0.70:1 OD 4l80e 2.48:1 1st, 1.48:1 2nd, 1:1 3rd, 0.75:1 OD 6l80e/90e 1st=4.03:1 2nd=2.36:1 3rd=1.53:1 4th=1:1 5th=0.85:1 6th=0.67:1 Swapping from a 4l60e/700r4 to a th-350 is good for 3-4 tenths alone. peace Hog |
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#44 |
Join Date: Dec 2012
Location: NC
Posts: 1,786
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I tied in a ground there GC, and clipped to the seat anchor bolt with alligator clips.
Went for a spin, and as usual, after about 5 minutes (Closed Loop, with an energized circuit causing interference???), at a stop, it went to 43, 30, 100 even... UGH. Was kind of hopin' you were right... but. MAN!!! WHAT COULD CAUSE SPEEDO READ, WHILE SITTING STILL??? Well, let's read some more here: ![]() Well, let's see how close they are...: White Input, and Brown Output Hmm... over there on the right, looks like the White Input, and the Brown Output are taped together pretty tight. I wonder if that's routed too close??? ![]() Last edited by Schrade; 01-23-2013 at 02:16 PM. |
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#45 |
Join Date: Dec 2012
Location: NC
Posts: 1,786
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I cut the tape, and separated the leads.
Took a ride, and NO DIFFERENCE. ![]() ![]() So from the DD Troubleshoot list, that leaves tach interference. But the original VSS harness Purple + Yellow is in place, so tach interference isn't likely... #2 switch is already on 'ON', for sensitivity adjustment. That leaves swap to Purple, from Yellow. Right??? Or a broken DD. I could cut the DD out of the speedo loop, and try the Orange speedo output, DIRECTLY form the Tranny Control Module, to the Yellow VSS lead, but the Comm Error of the handheld prevents writing the Pulse Per Minute setting to the Module... WAH. Last edited by Schrade; 01-23-2013 at 02:57 PM. |
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#46 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Where is the sensor ground wire? Its one of the two pins from the VSS sensor in the trans.
Page 8 of the .pdf http://www.dakotadigital.com/pdf/sgi-5.pdf "Speedometer will read Tach wire too close to Route the speed signal and tachometer are grounded together."when the vehicle is speed signal wire. wires away from each other to avoid sitting still. interference. Signal In and OUT wires Route the input and output wires away routed too close. from each other to avoid feedback. Ground interference. Make sure the speed sensor and SGI-5
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 01-23-2013 at 03:32 PM. |
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#47 | |
Join Date: Dec 2012
Location: NC
Posts: 1,786
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I just wired in a ground for the sensor, as GC was trying to point out. The pics I used in the latest posts are earlier, and don't show the new ground for Sensor... I got the .PDF (thanks Dave H), and I think you've posted the same excerpt, that's the same pg. 8 as above. What lead [or terminal] is for the speed sensor ground, to join to the DD/SGI ground connection??? OR SHOULD I JUST LOOP MY NEW DEDICATED 'SENSOR GROUND' LEAD, BACK INSTEAD TO THE 'GROUND' CONNECTOR??? Why aren't the internally bridged??? Last edited by Schrade; 01-23-2013 at 03:53 PM. |
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#48 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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BTW, Your output is hooked up to OUT 3, looks like it should be coming from OUT 4 based on the .pdf
OUT3, 8000ppm AC: most aftermarket speedometers and cruise controls OUT5, 2000ppm oc: most TBI computers and some OEM cruise controlsOUT4, 4000ppm oc: most TPI computers and some OEM cruise controls
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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