Are you running an LT1 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tphsmith · 01-05-2008, 04:01 AM

how many of you guys that have installed an LT1 have eliminated the mass Air Flowsensor. or how many have left it connected to your motor is there a advantage either way?

NPilot1975 · 01-05-2008, 04:11 AM

I am running an LT-1 and had the MAF removed. It runs fine with no problems. I read that it only helps when the engine is cold, but you may want to do some research if you are looking to get good gas mileage etc.

Slammed70 · 01-05-2008, 04:29 AM

Quote:

Originally Posted by tphsmith

how many of you guys that have installed an LT1 have eliminated the mass Air Flowsensor. or how many have left it connected to your motor is there a advantage either way?

With the exception of the 92/93(Which were speed density) all GEN IIs were MAF. And while they will run without one....the PCM will go into "Limp home mode" or stay in "Open loop" and rely on the MAP and semi-convert itself to speed density. While speed density itself isnt bad and does work, a MAF will always be better and provide the PCM with more signal to keep your engine running well.

Speed density = Uses MAP(Manifold Absolute Pressure) sensure to read the "load" on the engine by the amount of vacuum in the engine, lower vacuum means your on the gas, which will tell the PCM to hold the injectors open longer to let more fuel in, advance the timing, etc.

MAF = Mass Airflow Sensor mesures the amount incoming air to tell the PCM how much air is present, which then it will increase/decrease fuel depensing on how dense the air is. This setup is more advanced, and requires other sensors/signals to be sent to the PCM for it to work right.

Limp home mode = Program built into the PCM, which incase of failure of a vital sensor, the computer will revert to. There will be no incrase/decrease of fuel or spark advance, there will be zero power and will run so lean that it can cause MAJOR damage to an engine. This program is mainly designed so that you can get your car safely off the road, or to a shop.

Open loop = Another PCM program, when you first start your vehicle. The PCM is usually looking at only a few sensors. And will be in a fixed fuel/spark advance to privide better cold driving.

Hope that helps....DO NOT RUN WITH OUT IT!

Truckstr · 01-05-2008, 04:42 AM

With Slammed70. Exactly as he said.

I have a '94 Z28 w/ LT1. Really sweet running car. It is computer controlled, i.e., with electronic engine management system. ALL of the various inputs to the computer determine just how well it runs - not the least of which is the MAF sensor. It needs the MAF.

ibad57 · 01-05-2008, 05:17 AM

Im woundering can someone tell me is this a maf plug or what bought LT1 engine with this being the only plug hanging up front I thought it was ecm
Engine is 94 caprice and i could use a wireing scamitic

tphsmith · 01-05-2008, 05:31 AM

you can go to www.shbox.com thats where I go for schematics and also I bought a manual for the car the motor came out of

tphsmith · 01-05-2008, 05:32 AM

my motor the LT1 is a 94 so from what I read dont eleiminate the MAf at all?

Rokcrln · 01-05-2008, 05:33 AM

I have a n LT1 out of a 92 vett with all factory sensors hooked up and working. Mine is not a MAF engine but if it were I would run everything as well. The people that think thay can delete everything and still have a great or even better running engine need to go work for GM. GM spends multi millions on their engine research and if you are better then them I am sure they would rather pay you half that and still save money

It is their for a reason, don't mess with it!

Kevin
LFD Inc.

tphsmith · 01-05-2008, 08:21 AM

thanks Guys, I feel since you have these running and of course the obviuos
what Rokcrin points out about GM's experience that well if they studied and put it on the market, best not to try to short change the project. thanks again everyone

shifty · 01-05-2008, 10:09 AM

nice naked chick in your back window, Rockrln

Rokcrln · 01-05-2008, 11:23 AM

Quote:

Originally Posted by shifty

nice naked chick in your back window, Rockrln

Thats my shop helper! She cleans up nice

Kevin
LFD Inc.

Slammed70 · 01-05-2008, 02:36 PM

Quote:

Originally Posted by ibad57

Im woundering can someone tell me is this a maf plug or what bought LT1 engine with this being the only plug hanging up front I thought it was ecm

That is for the ECM, the MAF is a 3 wire pigtail, usually with red/black/yellow wires.

Quote:

Originally Posted by ibad57

94 caprice

Thats not an LT1.....

boojum · 01-08-2008, 06:46 AM

Quote:

Originally Posted by ibad57

Im woundering can someone tell me is this a maf plug or what bought LT1 engine with this being the only plug hanging up front I thought it was ecm
Engine is 94 caprice and i could use a wireing scamitic

That connector is for the ABS.

You can find wiring diagrams at http://ss.lencolab.com/.

Harness photo at http://home.cogeco.ca/~chadoliver1/LT1HarnessLow.jpg. The PCM connectors are the large blue, black,read and clear connectors in the lower left of the photo.

BP68 · 02-06-2008, 07:09 AM

Fyi - Some of the Caprice's have a 4.3 (W) V8 "baby LT1" Externally it looks just like the 5.7's but the cylinders/pistons are smaller.

Wootdog · 02-06-2008, 07:53 AM

Schematics. I believe I got my info from hotrodlane.com for my LT-1. And yes I hooked up all the sensors.
Kerry

Truckstr · 02-06-2008, 09:23 AM

Quote:

Originally Posted by Wootdog

Schematics. I believe I got my info from hotrodlane.com for my LT-1. And yes I hooked up all the sensors.
Kerry

Smart man.

01-05-2008, 04:01 AM	#1
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	Are you running an LT1 how many of you guys that have installed an LT1 have eliminated the mass Air Flowsensor. or how many have left it connected to your motor is there a advantage either way? __________________ Its Gonna be a Great Day, I woke up this Morning. 72 SWB Fleetside freshly painted. putting a 94 LT1 with 700R4 tranny lowered 4 in the front 6 in the back 81 chevy half ton 350 89 Silverado 4x4 going ta church truck

01-05-2008, 04:11 AM	#2
NPilot1975 Senior Member Join Date: Aug 2002 Location: Plymouth, MA Posts: 891	Re: Are you running an LT1 I am running an LT-1 and had the MAF removed. It runs fine with no problems. I read that it only helps when the engine is cold, but you may want to do some research if you are looking to get good gas mileage etc. __________________ 1972 Blazer body...need to get a thread started for the rest of the story

01-05-2008, 04:42 AM	#4
Truckstr Registered User Join Date: Nov 2002 Location: Lebanon, Tennessee Posts: 1,372	Re: Are you running an LT1 With Slammed70. Exactly as he said. I have a '94 Z28 w/ LT1. Really sweet running car. It is computer controlled, i.e., with electronic engine management system. ALL of the various inputs to the computer determine just how well it runs - not the least of which is the MAF sensor. It needs the MAF. __________________ Jeff '67 short Fleet; my ongoing project. '66 long Fleet; my original "baby." Live life or bust trying.

01-05-2008, 05:17 AM	#5
ibad57 Registered User Join Date: Jan 2007 Location: Owensboro KENTUCKY Posts: 262	Re: Are you running an LT1 Im woundering can someone tell me is this a maf plug or what bought LT1 engine with this being the only plug hanging up front I thought it was ecm Engine is 94 caprice and i could use a wireing scamitic Attached Images __________________ My Project Old Glory trike visit here http://www.facebook.com/home.php?#!/...48577705162172

01-05-2008, 05:31 AM	#6
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	Re: Are you running an LT1 you can go to www.shbox.com thats where I go for schematics and also I bought a manual for the car the motor came out of __________________ Its Gonna be a Great Day, I woke up this Morning. 72 SWB Fleetside freshly painted. putting a 94 LT1 with 700R4 tranny lowered 4 in the front 6 in the back 81 chevy half ton 350 89 Silverado 4x4 going ta church truck

01-05-2008, 05:32 AM	#7
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	Re: Are you running an LT1 my motor the LT1 is a 94 so from what I read dont eleiminate the MAf at all? __________________ Its Gonna be a Great Day, I woke up this Morning. 72 SWB Fleetside freshly painted. putting a 94 LT1 with 700R4 tranny lowered 4 in the front 6 in the back 81 chevy half ton 350 89 Silverado 4x4 going ta church truck

01-05-2008, 05:33 AM	#8
Rokcrln Senior Member Join Date: Jul 2005 Location: Winters Ca. 95694 Posts: 4,843	Re: Are you running an LT1 I have a n LT1 out of a 92 vett with all factory sensors hooked up and working. Mine is not a MAF engine but if it were I would run everything as well. The people that think thay can delete everything and still have a great or even better running engine need to go work for GM. GM spends multi millions on their engine research and if you are better then them I am sure they would rather pay you half that and still save money It is their for a reason, don't mess with it! Kevin LFD Inc. Attached Images Last edited by Rokcrln; 01-05-2008 at 05:34 AM.

01-05-2008, 08:21 AM	#9
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	Re: Are you running an LT1 thanks Guys, I feel since you have these running and of course the obviuos what Rokcrin points out about GM's experience that well if they studied and put it on the market, best not to try to short change the project. thanks again everyone __________________ Its Gonna be a Great Day, I woke up this Morning. 72 SWB Fleetside freshly painted. putting a 94 LT1 with 700R4 tranny lowered 4 in the front 6 in the back 81 chevy half ton 350 89 Silverado 4x4 going ta church truck

01-05-2008, 10:09 AM	#10
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	Re: Are you running an LT1 nice naked chick in your back window, Rockrln __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

02-06-2008, 07:09 AM	#14
BP68 Registered User Join Date: Jun 2006 Location: Olive Branch, MS Posts: 824	Re: Are you running an LT1 Fyi - Some of the Caprice's have a 4.3 (W) V8 "baby LT1" Externally it looks just like the 5.7's but the cylinders/pistons are smaller. __________________ 68 C10 Shortbed Fleetside 06 Chevy Ext Cab Fleetside 03 Grand Prix GTP My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=269999

02-06-2008, 07:53 AM	#15
Wootdog Senior Member Join Date: Jan 2001 Location: Virginia Beach, Va, USA Posts: 1,680	Re: Are you running an LT1 Schematics. I believe I got my info from hotrodlane.com for my LT-1. And yes I hooked up all the sensors. Kerry __________________ 1967 C10 Got it back after three years Boy I sure missed Peppy 1969 Chevelle 1990 IROC Z Convertible 2002 Silverado LT



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