Received the formatted chip...

secondarychaos · #1 Wed, February 18th, 2009, 12:41 AM

I received my formatted chip tonight, and put it in despite the fact it's snowing...
Good god, I couldn't believe how much power the race tune added...
stock felt the same, but with a slightly smoother idle.
High idle... well, it idles nicely at 1100...
tow tune had a little more power, and slightly lower egt's...
the Race tune was INCREDIBLE. I've heard what a intake/exhaust/tune truck will run like, but I had no idea until i felt it

I'm all grins tonight

***Power Hungry*** · #2 Wed, February 18th, 2009, 11:29 PM

Dan...

Awesome, bud!

Glad that everything is working splendidly.

Now, time to break out the software and start tweaking. Before you know it, you'll forget what sunshine looks like or where you put your fishing pole. Shortly after, your desk will look like this...

Holler if you need anything.

secondarychaos · #3 Thu, February 19th, 2009, 12:04 PM

Thanks Bill.
I'm doing alot of reading to see how all the different parameters affect the truck before I do too much. Don't want to mess anything up

The flypole stays IN the truck... Unless i'm fishing

.

secondarychaos · #4 Thu, February 19th, 2009, 12:24 PM

Ok Bill, I got a question for ya-
On the stock valvetrain, How far up in the RPMs can I safely go on 30-32lbs of boost?
I'm toying with the idea of letting it run up to 3500, maybe 3600...
Also, Where would the power fall off?
thanks,
Dan

***Power Hungry*** · #5 Thu, February 19th, 2009, 02:26 PM

On a 94-97 with a stock valvetrain, I'd be hesitant to push past 3500. The reason is that while the stock springs are capable of handling 4000 RPM, at this point they are probably quite worn out and 3750+ RPM at 30+ PSI may present a sealing problem.

At 1.68" diameter, the face of the valve has a surface area of 2.638 sq. in. which means that at 30 PSI boost there is about 79 Lbs. of pressure pushing against the valve. Brand new, the valve spring seat pressure is 71-79 PSI (spec.) and I'm sure they are much lower than that after 100K+ miles. As you can see, it is REALLY easy to push the valve open if you're not careful.

The power will fall off at 1 of 2 points... (1) Wherever you stop injecting fuel or (2) wherever you are not able to get more air into the engine. Generally the fuel control tables on an early motor starts pulling fuel out at 3300 RPM or so. Later trucks are about 3500 RPM.

Hope this helps.

secondarychaos · #6 Thu, February 19th, 2009, 02:39 PM

Awesome, thanks Bill!
I've noticed that with your tuning it pulls like a bull on steroids from the point that it comes on boost until it shifts

I figured I could add some Revs to it...
I'm already planning on upgrading the valvetrain for more boost.
thanks for the Spring seat pressure info, I've been trying to find that.