TPI OBDII - Thoughts/Opinions - Page 3 - TPI - Third Generation F-Body Message Boards

Fast355 · 11-30-2006, 07:02 PM

Quote:

Originally Posted by S10Wildside

I suspect that many will opt out of the MAF sensor. As long as the PCM is tuned right, it can be eliminated. The harness I built for my S-10 has the MAF wiring in it (as shown in pictures above), but I plan to take it out.

I AGREE, but WHY? Having it makes tuning things so much simpler.

Mkos1980 · 11-30-2006, 09:10 PM

Both my cars are MAF free and they are perfect.

Fast355 · 11-30-2006, 09:16 PM

Quote:

Originally Posted by Mkos1980

Both my cars are MAF free and they are perfect.

Then again, I am working with a TBI setup that will never be as acurate as a MPFI setup due to the wet manifold. The fuel vaporizing in the manifold also directly effects intake charge density and makes for fueling changes due to weather, engine temp, etc.

5ltrbtr · 11-30-2006, 10:14 PM

are the express van 350s 4 bolt or 2. I am in the market for a 350 to biuld and if they use 4 bolt mains than i can go to a junk yard and just pull everything at once.

Fast355 · 11-30-2006, 10:23 PM

Quote:

Originally Posted by 5ltrbtr

are the express van 350s 4 bolt or 2. I am in the market for a 350 to biuld and if they use 4 bolt mains than i can go to a junk yard and just pull everything at once.

Over 8,600 lbs GVW use 4 bolt mains. The rest are 2 bolts

Mkos1980 · 11-30-2006, 10:30 PM

I was wondering. For knock sensors they list one for under 8500 lbs and 1 for over 8500 lbs. Both for Vin R though. My GF and I ended up using the under 8500 GVWR one. Think the other one would have a differant effect.

S10, we tuned Erins car just a little on the street and we got knock with hers so we know it works. Its weird mine never showed a count anywhere.

1989GTATransAm · 12-01-2006, 11:12 AM

This thread needs to be made into a sticky. Another reason for the conversion is I plan on running the 4L60E transmission. Got to have those perfect shift points if I'm going to get that 11.99 et.

WinnipegGTA · 12-02-2006, 12:19 PM

Can someone make this a sticky..... This sounds like the future for Thirdgen ECM tuning unfolding before us.

WinnipegGTA · 12-02-2006, 12:49 PM

Can i got a question. Do you need to change to a 4L60E tranny for this new ECM style. What about the Throttle Body do you have to use a LT1 style TB instead of the L98 Style.

Fast355 · 12-02-2006, 12:54 PM

Quote:

Originally Posted by WinnipegGTA

Can i got a question. Do you need to change to a 4L60E tranny for this new ECM style. What about the Throttle Body do you have to use a LT1 style TB instead of the L98 Style.

I am not sure, but I doubt it. I know the TBI PCM used from 1993-1996 and the LT1 PCM can be used without the 4L60E being attached.

WinnipegGTA · 12-02-2006, 06:26 PM

how about retaining cruise, how does that work on the new ECM?

Mkos1980 · 12-03-2006, 11:10 AM

On my formula I run the 700R4 BUT There is no lockup available. I am installing a 79 dollar kit from TCI to correct this. MPH and cruise work perfectly. Its independent from the pcm. B

Lextech · 12-03-2006, 01:56 PM

The PCM doesn't know what kind of throttlebody you are using. The PCM uses 3 wires for the TPS and 4 wires for the IAC ( idle air control ) motor, so it's the same as an LT1 or L98. The 411 has 2 speed outputs, use one of those for the cruise. You don't have to use a 4l60 or 80 trans, but the cool part of using one of them is that you can tune shift points, line pressure, and when the torque convertor locks up, and more.

1989GTATransAm · 12-03-2006, 05:14 PM

One more question. Is the ALDL connector the same as on my 1989 L98 Trans Am? Do I have to change it out?

scuzz · 12-03-2006, 05:26 PM

Quote:

Originally Posted by 1989GTATransAm

One more question. Is the ALDL connector the same as on my 1989 L98 Trans Am? Do I have to change it out?

The 411 system uses a different aldl connector. The complete system is OBDII. You'll need EFILive or Tunercat II to work with the newer system. There's a lot of stuff to learn about the new OBDII system, but it works much better.
You have oxygen sensors for each bank, map and maf, tunable trans functions, and a host of other stuff.

1989GTATransAm · 12-03-2006, 06:45 PM

Thank you for the information. So I would have to also snag that portion from the donner car and fit it to mine.

Looks like I need to start hitting the local junkyards for Express Vans wiring harnesses. Are there any others wiring harnesses that will work? Like the Tahoe and Silverado's?

scuzz · 12-03-2006, 07:07 PM

I think someone on one of the threads used an S10 harness.
There is a thread on about 4 different forums that I know of. It seems that this changeover is gaining momentum.
I got S10Wildside to build one for me.
I have since pulled one from a 2001 Savanna in case I ever need it. The junk yard guy gave it to me to take it out. Kinda hard to turn down.
----------
By the way, there's more on the DIY board at
http://www.thirdgen.org/techboard/di...ml#post2801225 (Sequential Injection on a Gen I Motor!)
69ghost and I started discussing this a year of so ago, and started looking for a way to make the changeover before we found out that other people had already done the change, or were working on the same thing.
The swapping of info from everyone is helping everbody.
Thanks, guys.

Fast355 · 12-03-2006, 07:52 PM

Quote:

Originally Posted by scuzz

I think someone on one of the threads used an S10 harness.
There is a thread on about 4 different forums that I know of. It seems that this changeover is gaining momentum.
I got S10Wildside to build one for me.
I have since pulled one from a 2001 Savanna in case I ever need it. The junk yard guy gave it to me to take it out. Kinda hard to turn down.
----------
By the way, there's more on the DIY board at
http://www.thirdgen.org/techboard/di...ml#post2801225 (Sequential Injection on a Gen I Motor!)
69ghost and I started discussing this a year of so ago, and started looking for a way to make the changeover before we found out that other people had already done the change, or were working on the same thing.
The swapping of info from everyone is helping everbody.
Thanks, guys.

You can use an Astro/Safari van harness too. Like 2003-2004 year model.

scuzz · 12-03-2006, 08:00 PM

That's great to know.
I am doing the 411 project in a 41 Chevy pickup and wasn't sure if a stock harness would work, so I got some measurements and S10Wildside helped me out.
I have my PCM and all relays under dash hidden.

1989GTATransAm · 12-03-2006, 08:49 PM

Checking EFI Live it looks like one would need around $700 to get started. I assume this includes programing and datalogging.

Mkos1980 · 12-03-2006, 09:47 PM

I didnt connect anything to the 411 for the cruise. It worked itself from the bufferbox I assume. Also when S10 made my harness he built in a ALDL for me. Everything bolted right in and worked perfect on both cars

Mkos1980 · 12-07-2006, 02:31 PM

The 355 with blower should be running this weekend. We'll let you know how everything goes. I also just purchased a 4L60E for my Formula. its going to get a once over in January and should work perfect. I'm really diggin the electronics of it.

Also this seems so eay but its funny how I look back in the days of chip burning and alll the other crap that goes on in the DIY board lol.

S10Wildside · 12-07-2006, 03:17 PM

Quote:

Originally Posted by Fast355

I AGREE, but WHY? Having it (the MAF sensor) makes tuning things so much simpler.

EFILive has an auto tune feature for volumetric efficiency that requires their custom OS (operating system) that's speed density mode only. You can enable the MAF later, but I've been told that enabling the MAF after the speed density auto tune requires changes to the MAF table. It's my understanding that the MAF is a redundant source of information for air/fuel values and is really not necessary.

1989GTATransAm · 12-07-2006, 07:13 PM

Yep, I just purchased a 4L60E myself. Getting things ready for that project. Maybe in 6 months for the 411pcm. Two things ahead of it. Installing my new long block and then installing the First intake with SLP runners and factory style plenum.

Zepher · 12-24-2006, 10:27 PM

I was all set to convert my car to SD, but I guess I will have to do this mod instead.
does fuel economy go up at all?

Mkos1980 · 12-25-2006, 11:06 PM

Well Before my swap my best with SD was 16mpg with the 411 now we achieved 19 with NO converter lockup yet and a AF ratio of hi13's low 14's its not even tuned for highway yet. I expect mid 20 numbers from the 383 and high 20's even 30 for the 355 since the 355 was pulling 22mpg before the 411 swap.

Fast355 · 12-25-2006, 11:12 PM

Quote:

Originally Posted by Mkos1980

Well Before my swap my best with SD was 16mpg with the 411 now we achieved 19 with NO converter lockup yet and a AF ratio of hi13's low 14's its not even tuned for highway yet. I expect mid 20 numbers from the 383 and high 20's even 30 for the 355 since the 355 was pulling 22mpg before the 411 swap.

If this tells you anything, after the 411 swap and tuning, my PRODUCTION LT4 cammed Express is knocking on 20 mpg. 4L80E and 3.73s.

Mkos1980 · 01-12-2007, 03:54 PM

Pics!!! First pic is the 411 ECM and Mikes Custom Harness. Second pic is the Accel Billetech Distributor and Taylor Spiral Pro wires.
Third pic is the Crank Sensor and the last one is where I put the stock bracket from an S10 pickup. I also added an MSD coil to replace the GM one.

Mkos1980 · 01-12-2007, 03:56 PM

Number 4