chip question, newbie here

[lightspeed240]

This is a companion post to my lengthy one just a few minutes ago..
My truck is very low miles and excellent condition, so Id prefer it remain stock and "safe." It has a few mods like downpipe (2 3/4 upgraded, it seems,), borla cat back, KB intake and ATR big pump/heat exchanger. It had an ATR strip chip in it, but my buddies syclone detonated even running almost pure 104 octane fuel with an ATR strip chip, so I am not going to consider running that chip on pump gas. I just bought a new, stock chip and memcal for it, just because I knew it would be safe. I am noticing that the 4700 rpm limiter is very annoying, and being that I am a speed junky, I would like to have a little more performance, if its safe.
Is there any recommendation on a "safe" chip for 93 octane? My buddy had an ATR street chip that seemed to work well. He had a hypertech chip also, but it detonated on pump, so that is out. I dont want to modify the harness with a multi-chip setup. I mainly want a little more RPM limit and a little more performance overall. Its not going to be raced, so the lower IC pump cut-on doesnt matter much to me. I like ATR stuff so far, so I would be fine with that.
Or...The truck has a boost controller on it. I know its only got a 2 bar MAP, so it wont help to run much over 15 psi, but would it be ok to run maybe 16 PSI of boost on a stock chip with equal performanace? I do also have the ATR AFR meter, to help monitor AF ratio.
Does anyone have actual back-to-back dyno or track times that show the difrerence in an ATR street or comparable chip to a stock one? Is it actually worth it at all?
I read that the stock rods are weak over 5k RPM. Am I risking it to manually shift at the 5500 RPM-or-so that it should be to hit the torque peak in the next gear, if I did have a chip?
Thanks in advance guys.

 

[dgoodhue]

Re: chip question, newbie here

On a stock cammed/headed motor you wasting your time reving the motor past 4500 rpm. If the tranny is stock it should not rev past 4500rpm in D or OD. The ATR chip is basically a stock chip that is rich in boost and has open loop boost control.

"I dont want to modify the harness with a multi-chip setup"

You don't have to modify anything, it just plugs in. The harness hangs out of the chip and ECM.

 

[lightspeed240]

Re: chip question, newbie here

On a stock cammed/headed motor you wasting your time reving the motor past 4500 rpm. If the tranny is stock it should not rev past 4500rpm in D or OD. The ATR chip is basically a stock chip that is rich in boost and has open loop boost control.
"I dont want to modify the harness with a multi-chip setup"
You don't have to modify anything, it just plugs in. The harness hangs out of the chip and ECM.

Thanks for the input here. I was asking about the shift point because it is typically recommended that the optimal shift point is one that brings the engine to its torque peak in the next gear. I believe the torque peak is at 3600 rpm, and I notice that when the trans shifts automatically (at 4500 or less, as you said,) esp 1-2, its usally below 3600 RPM. It looks like 5000-5200 would work well, which would actually require manual shifting though (with a chip.) You guys have way more practical experience, so Im certainly open to suggestion.
When I was glancing through chips online, I was thinking some of them, like the ultimate, had somthing spliced into the harness. Its probably just the control unit that looks like it. Thanks for the clarification.
Would you recommend I not even worry about a ATR street/pitbull then? Will the stock chip with stock fuel pressure lean out too much at 16 psi or so? Is there any other real advantage to the chip for a mild motor?
BTW, this sounds silly, but how much does fuel economy suffer with a pitbull? These days, that makes a difference

 

[dgoodhue]

Re: chip question, newbie here

You can't run a stock chip at 16 psi, it will cut the fuel at any extended time over 15 psi.

The truck is still well within the torque band below 3600 rpm, eveb down to 2800 rpm torque is not problem with these trucks, we have plenty of it. The HP peak is 4200 rpm, so pushing well past that is going to slow you down. You really want to have the best average HP, once you get moving.

 

[lightspeed240]

Re: chip question, newbie here

You can't run a stock chip at 16 psi, it will cut the fuel at any extended time over 15 psi.
The truck is still well within the torque band below 3600 rpm, eveb down to 2800 rpm torque is not problem with these trucks, we have plenty of it. The HP peak is 4200 rpm, so pushing well past that is going to slow you down. You really want to have the best average HP, once you get moving.

Ouch, I didnt know about the boost cut on a stock chip.
I guess this is the limitation of having torque and HP peaks so close.
Thanks for the input..

 

[JSM]

Re: chip question, newbie here

I do also have the ATR AFR meter, to help monitor AF ratio.
Thanks in advance guys.

So much to learn grasshopper.

That meter goes with your screen name. It is purely a lightshow, nothing else.

You may even mount it above the GMC grille leters, and we can call you Knight Rider.

Seriously it tells you almost nothing.

 

[lightspeed240]

Re: chip question, newbie here

So much to learn grasshopper.
That meter goes with your screen name. It is purely a lightshow, nothing else.
You may even mount it above the GMC grille leters, and we can call you Knight Rider.
Seriously it tells you almost nothing.

Hey now, I bought the truck with all this shit on it. Im already pissed because I was told the truck was stock before I flew all the way up there. I wanted it stock for a collector truck. Now im finding more and more BS on it, and there are all these annoying issues. I was noticing this AFR meter does not seem to do much of anything. I have a wideband for my TEC3 on my 240z. Ill probably end up going with something like that if I end up keeping the truck long.