Starting to Learn on 95 G30 5.7 for Towing

[donf]

I took the dyno out again today. It was a slow day, only three cars, but the van seems to be doing a little better with the new chip I burned. I was still very conservative with the timing table and PE, just made a few small changes. I have not run the van on the dyno again but here is a picture of one of the cars we did today, nothing computer controlled on it, but it squeezed out 520 hp. I thought it was cool.

[Fast355]

Double post

[Fast355]

I took the dyno out again today. It was a slow day, only three cars, but the van seems to be doing a little better with the new chip I burned. I was still very conservative with the timing table and PE, just made a few small changes. I have not run the van on the dyno again but here is a picture of one of the cars we did today, nothing computer controlled on it, but it squeezed out 520 hp. I thought it was cool.

Nice!

i had a busy morning myself. I went after a used 2 pole 9,000 lbs capacity rotary lift that was replaced because it had a leaking cylinder. Paid my dealership scrap guy $100 for his time for meeting me with a helper and he gave me the lift.

One a side note that Nissan 4.0L/Jatco 5spd auto pull so well you barely even know there is a trailer back there. That Pathfinder has 2.94 gears. It holds OD and Lockup with ~3,000+ lbs behind it even at 60 mph which is about 1,600 rpm. Glad I brought along my engine hoist, a hefty chain and some good straps. That lift had some heavy support columns, guessing 6-700 lbs a piece. Heavy enough weight imbalance that I had to put the heavy end toward the tongue to keep the trailer from having negative tongue weight.

[Stokes1114]

Nice!

i had a busy morning myself. I went after a used 2 pole 9,000 lbs capacity rotary lift that was replaced because it had a leaking cylinder. Paid my dealership scrap guy $100 for his time for meeting me with a helper and he gave me the lift.

One a side note that Nissan 4.0L/Jatco 5spd auto pull so well you barely even know there is a trailer back there. That Pathfinder has 2.94 gears. It holds OD and Lockup with ~3,000+ lbs behind it even at 60 mph which is about 1,600 rpm. Glad I brought along my engine hoist, a hefty chain and some good straps. That lift had some heavy support columns, guessing 6-700 lbs a piece. Heavy enough weight imbalance that I had to put the heavy end toward the tongue to keep the trailer from having negative tongue weight.

I'd love to grab one of those!

[donf]

The pathfinder sounds impressive. I missed a newer Express van with low miles and an 8.1 two weeks ago. I did not have the time to drive 300 miles before someone else grabbed it.

[donf]

I was told not to waist my time, but I was curious to see for myself.
I got a cheap Jet Stage 1 chip to look at used. Its for a 1995 350 4l60e so I put it in. My chip with only revised shift points in a few gears was much more noticeable when towing. So I compared it to the stock truck bin to see the difference.
Main Spark vs Map Table was bumped by 1.1-3.2 degrees. This is supposed to be for a stock engine, but a lot of the changes were at 4400-6000 so not even noticeable as the engine never runs that high.
They bumped the fuel cut off from 98 to 115 mph, the only way my van will ever see that, is if it falls off a cliff.
The main fuel table was increased in almost the same areas they bumped the timing. Probably to combat detonation by making the engine very rich.

I cant believe, companies get away with selling this for $150 and up. Mine cost almost nothing so it was almost worth it just for the education on what not to do.

[Roadknee]

Hi Don. I was pretty active tuning my stock 1995 K1500 several years ago. My tuning threads are here:

engine
http://www.gearhead-efi.com/Fuel-Inj...uning-Autoprom

trans
http://www.gearhead-efi.com/Fuel-Inj...E-tuning-in-0D

header install
http://www.gearhead-efi.com/Fuel-Inj...header-install

I've attached my bin if you want to have a look at it. Truck has nearly 180,000 miles on it now. Same stock LO5 and 4L60e.

[Fast355]

I was told not to waist my time, but I was curious to see for myself.
I got a cheap Jet Stage 1 chip to look at used. Its for a 1995 350 4l60e so I put it in. My chip with only revised shift points in a few gears was much more noticeable when towing. So I compared it to the stock truck bin to see the difference.
Main Spark vs Map Table was bumped by 1.1-3.2 degrees. This is supposed to be for a stock engine, but a lot of the changes were at 4400-6000 so not even noticeable as the engine never runs that high.
They bumped the fuel cut off from 98 to 115 mph, the only way my van will ever see that, is if it falls off a cliff.
The main fuel table was increased in almost the same areas they bumped the timing. Probably to combat detonation by making the engine very rich.

I cant believe, companies get away with selling this for $150 and up. Mine cost almost nothing so it was almost worth it just for the education on what not to do.

I read a Hypertech I found in a 92 GM van once. For $2 at the wrecking yard. All they did is target a leaner PE mixture and increase the VE table and spark map in the 80+ KPA range. I tried it and WOT it actually ran very well but no changes to anything that would effect emmisions.

[donf]

Hi Don. I was pretty active tuning my stock 1995 K1500 several years ago. My tuning threads are here:

I've attached my bin if you want to have a look at it. Truck has nearly 180,000 miles on it now. Same stock LO5 and 4L60e.

Thank you I will take a look! I am sure there is some good stuff in there. Billy Graves has already helped me too with some trans help.

I read a Hypertech I found in a 92 GM van once. For $2 at the wrecking yard. All they did is target a leaner PE mixture and increase the VE table and spark map in the 80+ KPA range. I tried it and WOT it actually ran very well but no changes to anything that would effect emmisions.

No PE changes in the Jet chip. I did not bother to dyno it. I took it out after one trip pulling the trailer and dyno to the track. A lot of the changes were in the rpm ranges well past the limits of a stock 350 tbi. Every change over the stock chip is shown in this screen shot.