LT1-LT4 Modifications 1993-97 Gen II Small Block V8

LT1 tuning Questions 1994 OBD1

Old 10-12-2008, 06:16 PM
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Default LT1 tuning Questions 1994 OBD1


I recently purchased a 94 trans am for 300 bux

Should be cheaper on gas then my big block 04 silverado

Anyhow...

I would like to be able to do some pcm fine tuning.

I have some experience with tuning my ram jet pcm in my truck.

And after doing some research.

I have some questions I am hoping some of you that have experience may be able to help me with.


I like the idea of real time tuning.

I am familar with tunerpro. Is it possible to get a definiton file and a bin file to tune off of?

I am assuming I will need something to upload the files?

I am guessing tuner cat is capable of doing this?

And then I will need some kind of rom emulator? for real time?

I would appreciate any advice

Thanks
Old 10-12-2008, 06:17 PM
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Old 10-12-2008, 06:30 PM
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The '94 comes with the "flash" chip which is is programmed via the ALDL port.
Realtime tuning is not available on the "flash" version so tunerpro won't work in realtime with your PCM.

Sara Lou
Old 10-12-2008, 06:32 PM
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Ah so what do i need?

Just a way to upload it?
Old 10-12-2008, 08:55 PM
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Tunercats, and a cable and your good to go.
Old 10-12-2008, 09:02 PM
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what cable?
Old 10-12-2008, 09:15 PM
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A cable to hook your computer to the port under your dash.




Interface Cable Offerings

We have several styles of cables, one of which is right for you! Just remember, ALL of the AKM cables are for GM OBDI computers. They do NOT work on any true OBDII system, even though some use an OBDII *style* connector. If you've retrofit an OBDI system in to a OBDII car - we're good... if you're working on another style of retrofit (truck, street rod, etc) then we need to make sure that our wires line up. See the "Technical Info" to the left side of the screen.

Please don't get overwhelmed with all the choices - if you have any questions, email me!

Don't forget, I do a lot of "custom" work. Need an OBDI or OBDII connector on your LT1 Scanmaster? No problem. Need your 1994 or 1995 HPP unlocked from its VIN so you can sell it or get it working? No problem. Email Andrew for a price quote on any of these items or services. Got an idea of something electronics oriented you need done? Just ask!

There is one source of major confusion, hopefully these descriptions will help clarify:

"Older Style" OBDI Connector - 12 Pin, Rectangular Shaped, used on the following vehicles:
Up to 1994 F-body, Up to 1993 Y-body, Up to 1995 B-body, all SyTys, most other pre-1996 GM Vehicles

"Newer Style" OBDII Connector - 16 Pin, "D"-Shaped, used on the following vehicles:
1995+ F-bodies, 1994+ Y-bodies, and all 1996+ GM Vehicles

Be sure you check your connector if unsure!

We carry the following, and all prices include shipping in the US and First Class International postage around the world!:

RS232 cables are based on the MAX232ECPE (Electro-static-discharge resistant) interface chip, and is fully RS232 compliant. USB is based on the FTDI FT232R interface chip.

1. Cable with molded OBDI Connector, approx. 13 ft. in length (RS232) or 9 ft in length (USB)
Recommended for use with LT1_Edit Software, TTS Datamaster, and other high performance communications software (go to my order form) $90.00
2. Cable with molded OBDII-style connector, approx. 13 ft. in length (RS232) or 9 ft in length (USB)
Recommended for use with LT1_Edit Software, TTS Datamaster, and other high performance communications software (go to my order form) $90.00
Y. Cable with both molded connectors (OBDI and OBDII-style) - I call it an OBD-Y , approx. 13 ft. in length (RS232) or 9 ft in length (USB)
Recommended for shops that service multiple cars (go to my order form) $120.00
3. Cable with crimp-style pins and plastic OBDII connector, approx. 15 ft. in length, RS232 (The pins are soldered to the wires, but it's not as pull resistant as the molded cable) (go to my order form) $65.00
4. Cable with DB15 Male connector for use with a Hypertech cable or plug adapter, approx. 15 ft. in length, RS232 (go to my order form) $60.00
5. Converter with RS232 cable, no connector or wire on the automobile side (it does include a DB25 connector and hood, but you must connect to the car somehow - DB25 Pin 1/White wire is GND, DB25 Pin 5/Green Wire is data, Power connects at 22/GND/Black and 25/+12V/Red) (go to my order form) $50.00
6. Kit of Parts (same as #5 but unassembled), includes instructions and email support, RS232 (go to my order form) $35.00
7. OBDII-style Kit of parts (Same as #3 but unassembled), RS232 (go to my order form) $45.00
8. OBDI or OBDII / RS232 (no USB) connector kit of parts (same as #1 but unassembled) (go to my order form) $70.00
9. Printed circuit board (for RS232) - includes instructions and email support - but PLEASE make sure you have some soldering skills!!! (go to my order form) $10.00
10. Don't see what you want? Email me and we'll work it out! I do custom stuff all the time! Longer? Shorter? Want an experimental setup (160 baud stuff like on Peter G's homepage)? Of course, most of the time I don't charge extra for this stuff, but only do it when requested. email

Note: I'm not selling USB kits. I have no documentation on them, and I don't feel like documenting them at this point. I use very small surface mount devices that require above average soldering skill to build.

Go To Main Order Form

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Old 10-12-2008, 11:00 PM
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OK so an obd1 cable and tunercats?
I can pull the stock tune from the pcm that way? modify and reupload it?
Old 10-12-2008, 11:11 PM
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yes you can
Old 10-12-2008, 11:16 PM
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Originally Posted by xx_ED_xx
OK so an obd1 cable and tunercats?
I can pull the stock tune from the pcm that way? modify and reupload it?

thats right
Old 10-21-2008, 07:42 PM
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So if i want to do a 97 camaro i just need a cable for it and can use the tuner cats program?
Old 10-21-2008, 07:52 PM
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sorry to hijack but what is tunercat? Its a computer program for tuning GM OBD-1 vehicles right?
Old 10-21-2008, 08:38 PM
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Not 100% sure, but I think the '97 is OBD11, so Tunercat wont work, unless you buy their OBD11 software which is now sold by 'Jet'.

And MTBSully, yes it is a tuning software for OBD1, you can find it here: http://tunercat.com/ .

Sara Lou
Old 10-21-2008, 08:44 PM
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Ok so for the obd II car what do you recommend?
Old 10-21-2008, 09:04 PM
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obd1 conversion. Just have to solder a resistor inside the obd1 pcm and then its plug and play.
Old 10-21-2008, 10:36 PM
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1995 had a OBD2 plug with OBD1 computer,
1996+ are OBD2 computers.

EFI live is good for OBD2

I use tunercats to tune and datamaster for the 1/4 mile and Dyno simulators.
Old 11-16-2008, 03:05 PM
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Woo hoo the car runs.
But now i have some new questions.
I put a 97 automatic in it. I am going to work tomorrow to put the stock 94 a4 program in it. but the speedo is way off. I am doing 120 at like 45. IS there a difference in speed sensors between 94 and 97? or between auto and stick?


specs on car
1994 T/A original motor ( i think )
head gaskets blown so i replaced the heads with some mildly worked ones with lt4 springs
used impala head gaskets 1.6 SA roller tipped comps
gasket matched heads and intake
cat has no guts and a flow diaster muffler.
1997 camaro 4l60e
car was a 6 speed car so has 3.42 gears
Old 11-16-2008, 04:31 PM
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all this **** is confusing for me!!
Old 11-16-2008, 04:32 PM
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whats the deal with this program your all talking about?, what can it do to my car?
Old 11-16-2008, 05:05 PM
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I am glad your useful comment was made...

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