TPI Combo - Low Dyno Results
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: TPI Combo - Low Dyno Results
Motor must be hurt or trans
Or sure all plugs are firing?
Or sure all plugs are firing?
Member
iTrader: (1)
Joined: Sep 2005
Posts: 103
Likes: 8
From: SoCal
Car: 97 Z28
Engine: 396 LT1 518whp All Motor
Transmission: 6spd
Axle/Gears: 4.10 LSD
Re: TPI Combo - Low Dyno Results
Luis
I believe that’s your name.....could you post a picture of the dyno sheet
-Sergio
I believe that’s your name.....could you post a picture of the dyno sheet
-Sergio
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: TPI Combo - Low Dyno Results
Here is the last run...
Member
iTrader: (1)
Joined: Sep 2005
Posts: 103
Likes: 8
From: SoCal
Car: 97 Z28
Engine: 396 LT1 518whp All Motor
Transmission: 6spd
Axle/Gears: 4.10 LSD
Re: TPI Combo - Low Dyno Results
Wait......is that Sixseries dyno sheet? It lost power?
Who made 336hp361tq?
Who made 336hp361tq?
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: TPI Combo - Low Dyno Results
For one it looks lean but thats only gonna be worth a few ponies. Graph doesnt look all that smooth
Senior Member
Joined: Jun 2000
Posts: 599
Likes: 0
From: Glenbeulah, WI
Car: 1988 Firbird
Engine: 406
Transmission: T-56
Axle/Gears: 4.10
Re: TPI Combo - Low Dyno Results
It is very lean, it could be knocking and pulling timing which is power. Find out why it is so lean.
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: TPI Combo - Low Dyno Results
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Verified the timing this past Friday and somehow the timing was retarded by 6 Degrees 
The timing was checked & set when we did the “Street Tune” the Saturday before the Dyno. Not sure what happened but it must not have been meant to be...
Updates to Follow

The timing was checked & set when we did the “Street Tune” the Saturday before the Dyno. Not sure what happened but it must not have been meant to be...
Updates to Follow

Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Status Update:
Summer 2018 - Having Fun!
Irwindale Dragstrip 2018
I drove around
with a disconnected Throttle Valve/Kickdown/Detent Cable and of course the Transmission went out... Foolishy tried to Dyno the vehicle in this state so I burned $80.00 at MD Automotive on August 4th 2018
Albeit, I eventually replaced the Throttle Valve/Kickdown/Detent Cable with a unit from O' Reilly's at $20.55 it was too late 
Transmission Rebuild at Community Transmission in Bellflower
Estimated @ $1,400.00 with a rebuilt Torque Converter and Labor for removal & installation.
I've provided the following parts:
Vendor $$$ Cost Comparison
Dan @ Community Transmission recommended a Transmission Cooler & New Transmission Cooler Lines which aren't included in the estimate. He's also concerned with the Transmission Case being wrapped...
The Quest for 400ft LBS continues into 2020
Summer 2018 - Having Fun!

Irwindale Dragstrip 2018
I drove around
with a disconnected Throttle Valve/Kickdown/Detent Cable and of course the Transmission went out... Foolishy tried to Dyno the vehicle in this state so I burned $80.00 at MD Automotive on August 4th 2018
Albeit, I eventually replaced the Throttle Valve/Kickdown/Detent Cable with a unit from O' Reilly's at $20.55 it was too late 
Transmission Rebuild at Community Transmission in Bellflower
Estimated @ $1,400.00 with a rebuilt Torque Converter and Labor for removal & installation.
I've provided the following parts:
Vendor $$$ Cost Comparison
Dan @ Community Transmission recommended a Transmission Cooler & New Transmission Cooler Lines which aren't included in the estimate. He's also concerned with the Transmission Case being wrapped...
The Quest for 400ft LBS continues into 2020
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Community Transmission in Bellflower
Transmission Core Charge $250.00
Transmission Cooler & Lines $120.00
Transmission Banner Kit $125.00
Transmission Filter $12.00
Transmission Fluid (Synthetic) $69.00
High Stall (2500) Converter $295.00
Original Estimate of $1,400.00 Installed & Rebuilt
Community Transmission Grand Total: $1,950.00
Transmission Core Charge $250.00
Transmission Cooler & Lines $120.00
Transmission Banner Kit $125.00
Transmission Filter $12.00
Transmission Fluid (Synthetic) $69.00
High Stall (2500) Converter $295.00
Original Estimate of $1,400.00 Installed & Rebuilt
Community Transmission Grand Total: $1,950.00
Joined: Jan 2009
Posts: 887
Likes: 17
From: Golden, CO
Car: 87 IROC
Engine: L31 350
Transmission: T56
Axle/Gears: 4.10 D44
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Yeah, you know Dan? Based on the planetary gears he thought maybe NO Oil...
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
AutoZone Mail Order on Feb. 26th 2014
Duralast NEW Mass Air Flow $150.99 - 20% + TAXES = $131.66
AutoZone #5462 on Dec. 09th 2019
Delphi NEW Mass Air Flow $149.99 + TAXES = $165.25
The Duralast Mass Air Flow was returned for $175.99 + TAXES = $192.71
The Delphi Mass Air Flow was "Price Matched" to RockAuto
Fuel Filter $15.32
Duralast NEW Mass Air Flow $150.99 - 20% + TAXES = $131.66
AutoZone #5462 on Dec. 09th 2019
Delphi NEW Mass Air Flow $149.99 + TAXES = $165.25
The Duralast Mass Air Flow was returned for $175.99 + TAXES = $192.71

The Delphi Mass Air Flow was "Price Matched" to RockAuto

Fuel Filter $15.32
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
NO Activity in 2020 
Addressing the Brakes to get back on the road for 2021
Front Brake Calipers & Bolts by Power Stop $70.99 + Tax + $30.00 Core Charge
Wheel Hub Dust Cap by Dorman $4.99 X2 + Tax
Front Rotors by Hawk Performance $87.60 with Tax
Front Brake Hose Bolt X2 $5.79 each + Tax
Front Brake Pads $0.00 (AutoZone)
Front Wheel Seals $4.38 with Tax
Front & Rear Brake Lines $93.99 + Tax
Front Tires $129.20 with Tax & Tire Recycling Fee
Front Tire Mounting & Balance @ Rolling Tires in Bellflower but I can’t recall how much $$ ?
Front Wheel Polishing @ JD Polishing in Downey $60.00

Addressing the Brakes to get back on the road for 2021
Front Brake Calipers & Bolts by Power Stop $70.99 + Tax + $30.00 Core Charge
Wheel Hub Dust Cap by Dorman $4.99 X2 + Tax
Front Rotors by Hawk Performance $87.60 with Tax
Front Brake Hose Bolt X2 $5.79 each + Tax
Front Brake Pads $0.00 (AutoZone)
Front Wheel Seals $4.38 with Tax
Front & Rear Brake Lines $93.99 + Tax
Front Tires $129.20 with Tax & Tire Recycling Fee
Front Tire Mounting & Balance @ Rolling Tires in Bellflower but I can’t recall how much $$ ?
Front Wheel Polishing @ JD Polishing in Downey $60.00
Last edited by SixSeriesCSi; Mar 19, 2025 at 11:27 PM.
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Sorting out the loose ends...
1/0 Gauge Battery Cables $151.31
1/0 Gauge Alternator Wire $27.42
3/4" Alternator Wire Heat Sheath $16.86
1/0 Gauge Battery Cables $151.31
1/0 Gauge Alternator Wire $27.42
3/4" Alternator Wire Heat Sheath $16.86
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Over the years I became somewhat spoiled having Dyno Don tend to my Firebirds. His retirement meant that I had to find a NEW Mechanic... 
While not satisfied with the outcome of my "Diagnosis" it allowed me to pinpoint the problem; Mass Air Flow Sensor.
Mass Air Flow Sensor $0.00 (AutoZone)
Valve Cover Gaskets $31.89
Labor Charge $200.00
Back-up & Runnin'!!

While not satisfied with the outcome of my "Diagnosis" it allowed me to pinpoint the problem; Mass Air Flow Sensor.
Mass Air Flow Sensor $0.00 (AutoZone)
Valve Cover Gaskets $31.89
Labor Charge $200.00
Back-up & Runnin'!!
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Caspers Electronics TPS Enhancer @ $116.84
102015 - TPS-TEC THROTTLE ENHANCER
102015 - TPS-TEC THROTTLE ENHANCER
Joined: Nov 2008
Posts: 2,097
Likes: 177
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: TPI Combo - Low Dyno Results
Didn't know it was a thing. Never had a "slow" throttle response from a tuned port
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: TPI Combo - Low Dyno Results
Its not a thing, it just makes the TPS voltage the computer sees higher, so the computer thinks the throttle is open more than it really is. Supposedly that would make the computer give more fuel and timing sooner, but if you add more fuel without the incoming air to support it, you'll just be rich.
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
@Kevin91Z How have you been? Let's get together for a Data-Log Session soon. I'm still searching for those elusive 400ft-lbs of Torque from my Tuned Port Injection setup
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Excited
about the weight reduction!
Harmonic Balancer @ $349.97
Harmonic Balancer Bolt @ $5.97
OE GM Vibration Damper
62260D - Fluidampr CT Gold Harmonic Damper
Harmonic Balancer @ $349.97
Harmonic Balancer Bolt @ $5.97
OE GM Vibration Damper
62260D - Fluidampr CT Gold Harmonic Damper
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
Many Moons have passed and I bought another Firebird before I finished this project…
Oil Pan & Timing Cover Gaskets were replaced but one the bolts wasn’t tightened.
Since some of the Bolts were missing some were replaced and some weren’t, so they're mismatched. The Oil Pan Rail Girdles weren’t installed because I didn't have them readily available when I sent the car out for service. All, in-all dissatisfied with the quality of the work performed…
Oil $38.14 & Filter $17.08
Drain Plug $
Labor $450.00
Oil Pan & Timing Cover Gaskets were replaced but one the bolts wasn’t tightened.
Since some of the Bolts were missing some were replaced and some weren’t, so they're mismatched. The Oil Pan Rail Girdles weren’t installed because I didn't have them readily available when I sent the car out for service. All, in-all dissatisfied with the quality of the work performed…
Oil $38.14 & Filter $17.08
Drain Plug $
Labor $450.00
Last edited by SixSeriesCSi; Jan 18, 2026 at 03:09 PM. Reason: Grammer
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
The ol' TuffStuff Alternator was rebuilt @ C1 Alternators in Compton, CA.
$100 Labor & Parts
$100 Labor & Parts
Last edited by SixSeriesCSi; Jan 18, 2026 at 03:09 PM. Reason: Grammer
Thread Starter
Joined: Jun 2009
Posts: 863
Likes: 33
From: Bellflower, CA
Car: 89 Formula, 85 Trans AM & 91 Bird
Engine: 5.0 CARB, 5.7L TPI & 3.1L V6
Transmission: T-5/700R4/700R4
Axle/Gears: 9 Bolt & 10 Bolt X2
Re: TPI Combo - Low Dyno Results
I had the Electric Water Pump Mounting Brackets sandblasted at Freddy’s Carburetor in Paramount, CA but it’s been so long I don’t remember what I paid…
Stainless Steel Socket Cap Screws $20.21
Stainless Steel Socket Cap Screws $20.21
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