TPI BLM's
Thread Starter
Melting Slicks
Joined: Apr 2004
Posts: 2,771
Likes: 138
From: cyberspace NY
TPI BLM's
Did anyone ever get their BLM's to the 128 range after an injector swap? without burning a chip, and other mods.
My BLM's are ~145 since removing the OEM multiec's. Going back to Dephi injectors this weekend.
My BLM's are ~145 since removing the OEM multiec's. Going back to Dephi injectors this weekend.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
You didn't say but I assume you're talking about a 96 -- as shown in your profile. It's hard to remember 10 years ago, but I'm thinking later cars had 24# injectors? If so, the ECM would need to lengthen PW for 21's -- which might make idle to "fat". Sorry, If I'm remembering wrong...and later years ran 21's versus something smaller on L98s (like 19).
The other difference would be atomization. From FIC vids, our OEM stuff was the best at atomization. Depending on the flow pattern of a replacement injector, that might also lead to [the need for] differences in fueling tables.
The other difference would be atomization. From FIC vids, our OEM stuff was the best at atomization. Depending on the flow pattern of a replacement injector, that might also lead to [the need for] differences in fueling tables.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
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From: near the thumb in the mitten
21s are a little small even for the 92-3 batch fire which are 22; they should be 24 lbs. 94-96 are SFI not batch so injector size increased.. In other injectors pulse once just before plug is fired. Also make injector connectors are on correct injector
If you have adjustable fpr you could bump fuel pressure up to 50 see if fuel trim come closer to 128.
If you have adjustable fpr you could bump fuel pressure up to 50 see if fuel trim come closer to 128.
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Le Mans Master
Joined: Sep 2013
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From: near the thumb in the mitten
Pro
Joined: Aug 2020
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From: Liliha Bakery stuffing my face with coco puffs!
Idk what difference that it made but once seeing the Bosch 3s under the hood, sent me on a hunt for injector offsets for the injectors I had. Made the changes to the bin and never looked back. I think it made the engine crank to start time a wee bit longer but wasn't too concerned if the BLMs needed to be cleaned up.
Oil Producer
Joined: Apr 2014
Posts: 9,364
Likes: 2,734
your car had 22lbs from factory. i put bosch 3 in mine they were yellow at the time. my blms were on spec at 128. sounds like vacuum leak getting into bank 1. dont rule outleak at exh manifold bringing air into exhaust upstream from o2.
but you installed injectors that are not the same as factory rating. call john bannerman at fic.
but you installed injectors that are not the same as factory rating. call john bannerman at fic.
Thread Starter
Melting Slicks
Joined: Apr 2004
Posts: 2,771
Likes: 138
From: cyberspace NY
4 ohms across a 1989 Mulitec injector was a very common failure mode. Don't think it had anything to do with fuel. Just heat & age across the injector coil.