Paging Trevor & Patrick G re: TPS Shift Control
Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Nov 2001
Posts: 9,491
Likes: 1
From: Bethesda, MD
Paging Trevor & Patrick G re: TPS Shift Control Do either of you have a write-up on the line pressure/shift by TPS issue? My PCM is going to MTI on Monday and I'm interested in seeing if the changes are something they feel comfortable making. I remember the thread at LS1.com but they are down and there is a risk that they could start from scratch.
TIA <img src="images/icons/smile.gif" border="0">
TIA <img src="images/icons/smile.gif" border="0">
Re: Paging Trevor & Patrick G re: TPS Shift Control Ragtop,
If I remember correctly, somebody had Ed Wright do this to their PCM. They got it back and A-Tap the car and they really like it. Maybe give Ed a call and ask him about it. I think the line pressure is derived from a couple of inputs (I think on is the MAP sensor, and the other TPS). Going by just the TPS seemed to remove the slipping that some saw via A-Tap.
I maybe wrong about this but this is how I remember tge post on LS1.com
- Hope this helps
Tom <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
[ December 08, 2001: Message edited by: Tom99SS ]</p>
If I remember correctly, somebody had Ed Wright do this to their PCM. They got it back and A-Tap the car and they really like it. Maybe give Ed a call and ask him about it. I think the line pressure is derived from a couple of inputs (I think on is the MAP sensor, and the other TPS). Going by just the TPS seemed to remove the slipping that some saw via A-Tap.
I maybe wrong about this but this is how I remember tge post on LS1.com
- Hope this helps
Tom <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
[ December 08, 2001: Message edited by: Tom99SS ]</p>
Re: Paging Trevor & Patrick G re: TPS Shift Control Joel,
Having your line pressure mirror throttle position is not a bad idea, especially if you run a ported MAF. The pcm looks at "calculated load" when establishing line pressure and a ported MAF will show a lower load. By tying your trans pressure directly to tps, this will eliminate some potential problems of losing line pressure at high rpms. I'd try to see if MTI can tune that in.
Patrick
Having your line pressure mirror throttle position is not a bad idea, especially if you run a ported MAF. The pcm looks at "calculated load" when establishing line pressure and a ported MAF will show a lower load. By tying your trans pressure directly to tps, this will eliminate some potential problems of losing line pressure at high rpms. I'd try to see if MTI can tune that in.
Patrick
__________________
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.
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: Paging Trevor & Patrick G re: TPS Shift Control Yeah, what Patrick said. <img src="images/icons/tongue.gif" border="0">
I had Ed set my line pressure to my TPS, and I am pleased with it. I'm still running a stock MAF since he wouldn't tune with a ported one on the car, but I figured it would still be a good idea.
[ December 08, 2001: Message edited by: Trevor D ]</p>
I had Ed set my line pressure to my TPS, and I am pleased with it. I'm still running a stock MAF since he wouldn't tune with a ported one on the car, but I figured it would still be a good idea.
[ December 08, 2001: Message edited by: Trevor D ]</p>
__________________
Joined: Nov 2001
Posts: 3,043
Likes: 0
From: Texas and Qatar
Re: Paging Trevor & Patrick G re: TPS Shift Control It would be similiar to the way the old 4L60's, non-electronic transmission worked. They had a throttle valve cable to control line pressure, shift points and throttle angle to the transmission, just via a cable. You could even adjust the cable a little to set you shifts a little harder/softer to make a small difference. IMO setting it to the TPS should have been done from the beginning. <img src="images/icons/smile.gif" border="0">
Re: Paging Trevor & Patrick G re: TPS Shift Control If 4.7 volts is supposed to be max tps at 100%, you could back it up to be 100% line pressure at 4.5 volts and go from there.
__________________
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.
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.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Nov 2001
Posts: 9,491
Likes: 1
From: Bethesda, MD
Re: Paging Trevor & Patrick G re: TPS Shift Control I was thinking that maybe you might want full line pressure by 3/4 throttle. There's a fair amount of torque at that point on a H&C car with a big converter.
Also due you set it up as an override (i.e. if TPS > 4.5v then 100%, otherwise stock) or do you set up a linear relationship beginning with some non zero value for line pressure % (e.g. 1.0 volt = 25%, 2.0 volt = 50%, etc)
Also due you set it up as an override (i.e. if TPS > 4.5v then 100%, otherwise stock) or do you set up a linear relationship beginning with some non zero value for line pressure % (e.g. 1.0 volt = 25%, 2.0 volt = 50%, etc)
Re: Paging Trevor & Patrick G re: TPS Shift Control [quote]Originally posted by Trevor D:
<strong>I'm still running a stock MAF since he wouldn't tune with a ported one on the car, but I figured it would still be a good idea.
[ December 08, 2001: Message edited by: Trevor D ]</strong><hr></blockquote>
Sorry to get off topic, but why wouldn't he tune for a ported MAF? <img src="images/icons/confused.gif" border="0">
thanks,
Steve
<strong>I'm still running a stock MAF since he wouldn't tune with a ported one on the car, but I figured it would still be a good idea.
[ December 08, 2001: Message edited by: Trevor D ]</strong><hr></blockquote>
Sorry to get off topic, but why wouldn't he tune for a ported MAF? <img src="images/icons/confused.gif" border="0">
thanks,
Steve
Re: Paging Trevor & Patrick G re: TPS Shift Control Top Fuel,
Ed Wright is very reluctant to tune for customers with ported MAFs...especially if they send the pcms over UPS. He never knows what to set the a/f ratio at. That's why Trevor and I run stock MAFs.
Patrick.
Ed Wright is very reluctant to tune for customers with ported MAFs...especially if they send the pcms over UPS. He never knows what to set the a/f ratio at. That's why Trevor and I run stock MAFs.
Patrick.
__________________
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.
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: Paging Trevor & Patrick G re: TPS Shift Control If/when I do a heads/cam setup, I'm going to have him dyno tune it with a ported MAF. This way I KNOW it's right and I don't have the thoughts of added HP from added intake flow sitting in the back of my mind. 5 HP is 5 HP! <img src="images/icons/grin.gif" border="0">
IMO, he could make some money on ported MAF ends if he'd carry a set that he can tune for. I can see the home-ported MAFs being a problem b/c he doesn't know how much someone has ported it. However, if he carries a set of plastic MAF ends that he KNOWS is xxx bigger than the stock unit, then I would think he could tune that in with the other mods to hit the proper a/f ratio.
[ December 09, 2001: Message edited by: Trevor D ]</p>
IMO, he could make some money on ported MAF ends if he'd carry a set that he can tune for. I can see the home-ported MAFs being a problem b/c he doesn't know how much someone has ported it. However, if he carries a set of plastic MAF ends that he KNOWS is xxx bigger than the stock unit, then I would think he could tune that in with the other mods to hit the proper a/f ratio.
[ December 09, 2001: Message edited by: Trevor D ]</p>
__________________
Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Nov 2001
Posts: 9,491
Likes: 1
From: Bethesda, MD
Re: Paging Trevor & Patrick G re: TPS Shift Control He claims the ported MAFs aren't as stable in their readings, but maybe that's because of the inconsistent porting issue.
Trevor: do you have any of the details as to how he programmed for the line pressure. See my last question, re: linear function or override.
Thanks <img src="images/icons/smile.gif" border="0">
Trevor: do you have any of the details as to how he programmed for the line pressure. See my last question, re: linear function or override.
Thanks <img src="images/icons/smile.gif" border="0">
TECH Junkie
iTrader: (7)
Joined: Nov 2001
Posts: 3,378
Likes: 1
From: From the Bowels of Hell!!! You want some of me bitch?!?!?!
Re: Paging Trevor & Patrick G re: TPS Shift Control [quote]Originally posted by Ragtop 99:
<strong>I was thinking that maybe you might want full line pressure by 3/4 throttle.</strong><hr></blockquote>
Wellin a drag racing application, that really doesn't fall into play due to the fact that once you leave the line, you are at WOT for the duration of the run.
I would do as Patrick said and have it tuned about .2-3v below the suggested value of WOT being 4.7v.
Tim
<strong>I was thinking that maybe you might want full line pressure by 3/4 throttle.</strong><hr></blockquote>
Wellin a drag racing application, that really doesn't fall into play due to the fact that once you leave the line, you are at WOT for the duration of the run.
I would do as Patrick said and have it tuned about .2-3v below the suggested value of WOT being 4.7v.
Tim
Thread Starter
TECH Senior Member
iTrader: (7)
Joined: Nov 2001
Posts: 9,491
Likes: 1
From: Bethesda, MD
Re: Paging Trevor & Patrick G re: TPS Shift Control Tim: I agree for racing, I was just wondering on the street in passing situations, etc whether that would help with longevity.
