Also, I'm running an E-trans, so no getting away from the 7427.
Also, I'm running an E-trans, so no getting away from the 7427.
94 Blazer, Turbo'd 350 TBI - DD
1991 2500 Suburban Adventure truck - 4wd conversion, 4-link F/R, 582ci CNP Big Block with Terminator X EFI backed by a 6L90 and twin stick'd NP205 t-case
2012 Porsche Panamera Turbo - Date night car :)
1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
Several years I ventured into researching a TBI boost application: http://www.gearhead-efi.com/Fuel-Inj...rged-454-4L80E
Hindsight being 20/20, I would recommend using a Dynamic EFI system for boost: http://www.dynamicefi.com/EBL_Choice.php
dave w
This guy did it couple years ago, might look through his post to find some good info.
http://www.gearhead-efi.com/Fuel-Inj...ght=7427+turbo
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
I'd love an EBL but I'm not going to buy another ECM just to go through the headache of piggy backing the factory one to get trans control.
I forgot to mention... I'm going to run an external regulator with a billet injector pod and a pair of Bosch 210s, which should be pretty interesting tuning by itself.
Injector pod.jpg
94 Blazer, Turbo'd 350 TBI - DD
1991 2500 Suburban Adventure truck - 4wd conversion, 4-link F/R, 582ci CNP Big Block with Terminator X EFI backed by a 6L90 and twin stick'd NP205 t-case
2012 Porsche Panamera Turbo - Date night car :)
1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
The option to use a 2 Bar MAP with the '7427 is a good option, not a better option, or the best option.
dave w
94 Blazer, Turbo'd 350 TBI - DD
1991 2500 Suburban Adventure truck - 4wd conversion, 4-link F/R, 582ci CNP Big Block with Terminator X EFI backed by a 6L90 and twin stick'd NP205 t-case
2012 Porsche Panamera Turbo - Date night car :)
1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
I looked through pretty much all of his posts, seems like after getting the data right he did ok, but ended up smoking the motor anyways. Not sure why.
EDIT: JUST found a thread I missed from him, looks like an XDF tune and ADX was posted. This will give me something to chew on for awhile!
Last edited by 1BadAction; 05-18-2021 at 05:43 AM.
94 Blazer, Turbo'd 350 TBI - DD
1991 2500 Suburban Adventure truck - 4wd conversion, 4-link F/R, 582ci CNP Big Block with Terminator X EFI backed by a 6L90 and twin stick'd NP205 t-case
2012 Porsche Panamera Turbo - Date night car :)
1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
I ended up keeping the stock injector tree for now, with a 28-32lb spring and an Aeromotive Stealth 340LPH pump. They're running at a hair over 28psi so I have the injector size setting at 90 LB/HR. So far there are no ill-effects from running this pressure, the injectors aren't leaking, it's not running overly rich, etc.
The VE needed about 10 numbers knocked off of it and my WOT duty cycle is about 45% with PE active. This gives me some overhead power wise. AE needed to go leaner on tip-in and richer on a WOT stomp (I assume) due to the wide open intake elbow. I got it to where there's no bog or dead spots anywhere but I'm not getting too involved since I'll be building the hot side sometime this week. I expected it would be some work to get the 2 bar up and running correctly, but there were a LOT more altitude modifier tables than I had expected. Pretty sure I have all of them where they need to be since my driving around the last couple days has produced no weird quirks in the tune like it did initially.
94 Blazer, Turbo'd 350 TBI - DD
1991 2500 Suburban Adventure truck - 4wd conversion, 4-link F/R, 582ci CNP Big Block with Terminator X EFI backed by a 6L90 and twin stick'd NP205 t-case
2012 Porsche Panamera Turbo - Date night car :)
1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
I'm also running about 26 psi (best I can remember) with TBI 7427. VE wasn't too much trouble mostly AE stuff even the fuel adders PW for AC clutch needed work.
89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
05 Outback XT 2.5L turbo gas auto
I also used 96lt4c4's adx and xdf. been running $0D/4l60e with boost for over a year now. I'm curious what altitude modifiers you changed (the pic is too small to read on my system). I ended up zeroing out most of the tables in my tune that referenced baro.
Last edited by PJG1173; 06-22-2021 at 05:18 PM.
87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,
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