Repinning TBI to Speed Density TPI - Page 7 - Third Generation F-Body Message Boards

Go Back  Third Generation F-Body Message Boards > Tech Boards > TPI
Reload this Page >

Repinning TBI to Speed Density TPI

TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by:
Sponsored by:

Repinning TBI to Speed Density TPI

Old 10-19-2017, 04:03 PM
  #301  
Member
 
InsaneIROC's Avatar
 
Join Date: Jun 2004
Location: Hermosa Beach Cali
Posts: 395
Car: 89 1LE IROC Z28
Engine: 364 Ci Ls2
Transmission: Mn12 T56
Axle/Gears: Borg Warner 9 Bolt With 3.70 Gears
Re: Repinning TBI to Speed Density TPI

Those heads will sacrifice power but it should run fine
InsaneIROC is offline  
Old 01-30-2018, 12:40 PM
  #302  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

I've read through this entire post and I must be missing something. I'm converting an 88 305 TBI to TPI using a 91 donor including the 730 ECM and the harness. Looks easier to just repin the TBI harness but I have two questions. I understand bypassing the ESC module but I don't see any wires labeled as C & E to splice together. I assume these are two wires on the plug that goes into the distributor? Which ones?
Another confusing point for me is: if both TBI and TPI use the same distributor, why does the 746 pin out diagram show a coil and the 730 pin out diagram does not show a coil? Thanks
Midlife Cruiser is offline  
Old 01-30-2018, 12:47 PM
  #303  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

The esc bypass connects the black to blue wire so there is a continuous wire to the ks. F9 will be the 730s input for the ks.
The letters are on the esc connector. No need to see a image of the coil. There are two wires that connect from the icm to the coil like tbi a pink and white wire.
Large gauge pink is coil power from the body harness/white is tach.

Last edited by Tuned Performance; 01-30-2018 at 12:54 PM.
Tuned Performance is offline  
Old 01-30-2018, 01:51 PM
  #304  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Thank You. So, cut the Dk Blu from KS at E and Blk off the ESC at C and connect the KS DkBlu to the Blk. Then pin Blk to F9 so there is a continuous feed from F9 to the KS. Another post said to cut the ESC module off altogether and throw it away. What do I do with the PNK/Blk and Brn that I cut off the ESC?

Last edited by Midlife Cruiser; 01-30-2018 at 02:37 PM.
Midlife Cruiser is offline  
Old 01-30-2018, 06:45 PM
  #305  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Thanks. I'm actually converting from a 165 ecm to 730. I'll keep looking for the repin diagram for that.

Last edited by Midlife Cruiser; 01-31-2018 at 09:28 AM.
Midlife Cruiser is offline  
Old 02-03-2018, 05:40 PM
  #306  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Running into questions as I'm repining. Yes I've read all of this post many times. I am converting from 88 305 TBI with Auto trans and a 165 ECM to TPI using a 91 donor TPI with 730 ECM. I am repining my 88 TBI harness for use with the 730 ecm using conversion charts from thirdgen and chevythunder. (The conversion charts from 165 to 730 are less accurate than charts for 746 to 730). I am also relying on a 1988 Camaro Electrical Diagnosis manual to verify pinouts on the 165 ecm for a VIN "E" Camaro. Ok here are two initial questions there will probably be more later.
1. The A10 pin on the 165 shows VSS Buffered to be moved to C6 on the 730. Am I correct that since my 88 has a mechanical speedo cable that I can leave this disconnected or should I go ahead and pin it to the C6 for 730?
2. The 165 to 730 charts show A11 as MAF Analog Gnd on the 165 and shows "not connected" on the 730. (I assume because the 730 doesn't use MAF) However, the Camaro Elec Diag manual shows A11 is Gnd for MAT, CTS and TPS. If I leave A11 disconnected on the 730 pins how will MAT, CTS and TPS find Gnd?
Please Help
Midlife Cruiser is offline  
Old 02-03-2018, 05:56 PM
  #307  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

The vss needs to be hooked up to retain iac function and tcc lockup.
Now the vss signal is hooked to pin a10 of the 88 063 ecm. It needs to be hooked to the optical input of the 730 pin c6. The memcal will need to be reprogrammed for this change as well as deleting your vats. Here is a schematic for hooking up the sensor grounds from a11 of your tbi ecm to b5 or b6 of the 730.
D2 on your tbi ecm is a dedicated map ground. This can be spliced onto b6 the cts ground.

Last edited by Tuned Performance; 02-03-2018 at 06:30 PM.
Tuned Performance is offline  
Old 02-03-2018, 08:06 PM
  #308  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Thanks for helping
Midlife Cruiser is offline  
Old 02-05-2018, 10:31 PM
  #309  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Originally Posted by Tuned Performance View Post
The vss needs to be hooked up to retain iac function and tcc lockup.
Now the vss signal is hooked to pin a10 of the 88 063 ecm. It needs to be hooked to the optical input of the 730 pin c6. The memcal will need to be reprogrammed for this change as well as deleting your vats. Here is a schematic for hooking up the sensor grounds from a11 of your tbi ecm to b5 or b6 of the 730.
D2 on your tbi ecm is a dedicated map ground. This can be spliced onto b6 the cts ground.
What other changes will need to be made to the Memcal? Who does the reprogramming? There is so much info on this site that it can be impossible to wade through it all and find the answers I need.
Midlife Cruiser is offline  
Old 02-05-2018, 10:35 PM
  #310  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

You can send me a pm about reprogramming . It depends on what you need emissions disabled ect..

https://www.thirdgen.org/forums/dfi-...ormance-3.html

Last edited by Tuned Performance; 02-05-2018 at 10:46 PM.
Tuned Performance is offline  
Old 02-06-2018, 09:58 AM
  #311  
TGO Supporter/Moderator
Thread Starter
iTrader: (12)
 
anesthes's Avatar
 
Join Date: Jul 1999
Location: SALEM, NH
Posts: 10,996
Car: '88 Formula, '94 Corvette, others
Engine: 412" sbc, LT1, etc
Transmission: TH350, 4L60E
Axle/Gears: 10 bolt, 3.42, Dana36 3.07
Re: Repinning TBI to Speed Density TPI

Originally Posted by Tuned Performance View Post
You can send me a pm about reprogramming . It depends on what you need emissions disabled ect..

https://www.thirdgen.org/forums/dfi-...ormance-3.html
I edited the first part of the thread. Looks like the VSS and vats/emissions stuff comes up a lot, and apparently I should have mentioned it in 2003 or whenever I started this thread.

-- Joe
anesthes is offline  
Old 02-06-2018, 11:43 AM
  #312  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

I wasn’t sure this information made the thread.To add information about the 1228063 and the 1228746 ecm here is a pinout for both ecms.

Tuned Performance is offline  
Old 02-06-2018, 11:56 AM
  #313  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Appreciate the effort. As I mentioned in my post I'm converting from a 165 to 730. Is the 1228063 related to the 165 somehow?
Midlife Cruiser is offline  
Old 02-06-2018, 12:04 PM
  #314  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

The 063 is 88 tbi vin e ecm, the pinout is the same as the 746 (89-92) tbi ecm.
Tuned Performance is offline  
Old 02-06-2018, 12:08 PM
  #315  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

Just in case you need the fan wiring diagram for the 730.

Tuned Performance is offline  
Old 02-07-2018, 10:07 AM
  #316  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Thanks
Midlife Cruiser is offline  
Old 03-14-2018, 07:12 PM
  #317  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

My 88 TBI VIN E has the 165 ecm
Midlife Cruiser is offline  
Old 03-16-2018, 05:13 PM
  #318  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

I'm on the final two steps to repining from 1988 165 TBI to 1991 730 TPI. The esc diagram above shows the KS has a Dk Blu wire connected to terminal E. My 165 esc connector has a white wire from the E terminal to the KS. (The 1988 Electrical Diagnosis Service manual confirms the white KS wire) I assume I should splice the white (E) and black (C) together and pin to F9?
Midlife Cruiser is offline  
Old 03-16-2018, 05:24 PM
  #319  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

I would assume that’s correct. Once connected you might want to ohm f9 to the end of the ks connector to make sure it’s a continuous wire.
Tuned Performance is offline  
Old 03-16-2018, 09:48 PM
  #320  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

I'll definitely do that. Have been doing that through the whole process just to be sure. Checked for continuity with meter to find the MAT, TPS, CTS and MAP connectors to find where the CTS, MAT and TPS grounds were spliced before separating the CTS GND and moving to the MAP GND. I'm getting close!
Midlife Cruiser is offline  
Old 05-08-2018, 04:27 PM
  #321  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Originally Posted by Tuned Performance View Post
The 063 is 88 tbi vin e ecm, the pinout is the same as the 746 (89-92) tbi ecm.
My 88 305 TBI has a 165 ecm not 063. No one has answered if the 165 is the same as the 063 ecm or if there is a different pinout. I have finished the pinout and placed the harness/ecm back in the car. It won't start. If I spray starter fluid in the throttle body of the TPI it will fire until the starter fiuid is used up, so it must be a fuel supply problem. I have 12v+ at both left & right banks of the injectors from the fuse block, but can't detect any ground signal at the injectors from the ecm. I connected the green and blue injector wires (spliced to the left & right side TPI injectors) to C11 and C12 on the 730. Any ideas on why no ground signal from ecm?
Midlife Cruiser is offline  
Old 06-12-2018, 09:26 AM
  #322  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

After much research and help from Tuned Performance, the 88 is running good. Everything works except the Cruise Control. Looks like some more research . Thank you to Tuned Performance for his help !
Midlife Cruiser is offline  
Old 11-21-2018, 10:11 AM
  #323  
Junior Member
 
Join Date: May 2012
Location: Arcadia, OK
Posts: 80
Car: 1990 Pontiac Firebird Formula
Engine: LO3 305 SD TPI Conversion
Transmission: 700R4 Auto
Axle/Gears: 3.23 Posi
Re: Repinning TBI to Speed Density TPI

Okay, have a question. After examining the "VSS speed sensor buffer box" situation, I think I have found an answer for converting TBI to TPI 7730 ECM. Using my 1990 factory service manual as reference, it appears that the only reason for the buffer box is to provide 2,000 Hz signal to TBI ECM. The 7730 (TPI) ECM uses the 4,000 hz signal directly from the VSS. So, if I run the red wire going to the buffer box instead to C1 (cruise control) of the 7730 ECM, tan wire to B11 (instrument cluster), purple wire to B9 (VSS), and yellow wire to B10 (VSS), I will have taken the buffer box out of the equation, correct?
rt66er is online now  
Old 11-21-2018, 02:50 PM
  #324  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 11,188
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Repinning TBI to Speed Density TPI

Tuned Performance is offline  
Old 11-24-2018, 11:55 AM
  #325  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Sorry rt66er, busy weekend. Haven't had a chance to look in to your question. Once weekend slows down I'll look at it and get back to you. Looks like "Tuned Performance" has responded to your question. You're in good hands with him!
Midlife Cruiser
Midlife Cruiser is offline  
Old 01-09-2019, 05:41 PM
  #326  
Junior Member
 
Join Date: May 2012
Location: Arcadia, OK
Posts: 80
Car: 1990 Pontiac Firebird Formula
Engine: LO3 305 SD TPI Conversion
Transmission: 700R4 Auto
Axle/Gears: 3.23 Posi
Re: Repinning TBI to Speed Density TPI

Just an FYI: Everything in my above post is correct. Cruise control, speedometer, tach and gauges all work perfectly.
rt66er is online now  
Old 01-10-2019, 11:00 AM
  #327  
Junior Member
 
Join Date: Jul 2008
Location: Minnestota
Posts: 25
Car: 69 Camaro and 69 Chevelle SS
Engine: Camaro is FB385, Chevelle is 396
Transmission: Camaro is 200-4R, Chevelle is 4 spd
Axle/Gears: Cam 9 inch 3.70, Chev 12 bolt 3:23
Re: Repinning TBI to Speed Density TPI

Good to know! Thanks for sharing the info!
Midlife Cruiser is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Steve78LT
Tech / General Engine
4
02-24-2016 01:15 AM
InfinityShade
Transmissions and Drivetrain
15
08-22-2015 09:00 PM
jbd1969
Tech / General Engine
1
08-17-2015 08:06 PM
Sanjay
Engine/Drivetrain/Suspension Parts for Sale
1
08-12-2015 04:41 PM
86Base
TPI
14
08-08-2015 02:34 PM


Thread Tools
Search this Thread
Quick Reply: Repinning TBI to Speed Density TPI


Advertising
Featured Sponsors
Vendor Directory

Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: