Manifold Pressure Sensor MPS Adjustment, I have read PBanders thread several times Options

[brant]

other than idle...

I assume you are doing your 2500 test under load (driving down the road)

you need to
you can run the lm1 in the window and watch it while driving.

brant

[cary]

Both static and road test.

[ape914]

dont forget fuel pressure , if it is way out of wack, it will effect AF readings.

I have had mine as high as 34 psi to hep enrichen it (wilder cam, big bore) now have played with MPS and AFM.

anyway check fuel pressure before adjusting MPS

[cary]

Now thats a thought.
Pretty certain I'm dead on at 29#'s.
Might move it up to 32-34#'s.

I'm still a little lean.
I want to drive it 500 miles. Adjust the valves.
Then adjust AFR again.

Went for a spirited 35 mile drive. Other than the decel kind of hanging up. Everything went great.

[cary]

Finished the 500 miles with a trip to Cascade Locks and Crown Point.

Couldn't drive it like I stole it. Too much Sunday traffic. But it was great driving with the sun and wind. Perfect 75 degree day.





Then yesterday I did the 500 mile oil change and valve adjustment.
And fixed my oil leak. I'd put a copper washed under the oil pressure gauge hose to block connection. The tapered threads didn't think that was funny.

[914_teener]

Finished the 500 miles with a trip to Cascade Locks and Crown Point.

Couldn't drive it like I stole it. Too much Sunday traffic. But it was great driving with the sun and wind. Perfect 75 degree day.





Then yesterday I did the 500 mile oil change and valve adjustment.
And fixed my oil leak. I'd put a copper washed under the oil pressure gauge hose to block connection. The tapered threads didn't think that was funny.

Great thread thanks.

I haven't found the LM-1 though...from the Innovate site they have been discontinued?

[ChrisFoley]

...
I haven't found the LM-1 though...from the Innovate site they have been discontinued?

They stopped selling LM-1 when they released LM-2.
I bought an LM-2 and, as a result of the experience, will never buy another product from Innovate.

[914_teener]

...
I haven't found the LM-1 though...from the Innovate site they have been discontinued?

They stopped selling LM-1 when they released LM-2.
I bought an LM-2 and, as a result of the experience, will never buy another product from Innovate.

What do you use Chris?...No hijack intended but I would assume wide band.

[ChrisFoley]

I'm using a narrow band in my own vehicle.
I insist that all my customers with modified engines get a wideband meter. I sell an AEM digital wideband unit.

[cary]

After hijacking the post last summer. (IMG:style_emoticons/default/sad.gif) (IMG:style_emoticons/default/sad.gif)

I thought I'd bring everyone up to date. After charging the battery. She fired right up. Idle climbed to 1500 with AAR. Dropped to around 800 rpms as it warmed up.
Then sat there and idled at 950 rpms.

All that work and adjusting last fall was well worth it. (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif)

[worn]

Update :

I bought both an Amprobe LCR and an Innovate LM-1.
So now I'm in this up to my neck.

The LCR made adjusting the MPS very simple.
All adjustments dead on with Brad's MPS chart.
But the LM-1 still shows me very lean at idle.
I'm like 25.5%
Probably too lean at partial throttle too.
14 & 15%.

So I'm thinking I'll do the 2500 rpm test and dial the AFR to 12.7 with the MPS inner screw. Then back out the full throttle stop the same amount of turns?
Am I on the right track? Suggestions?

The full throttle stop screw has an adjustment hole in it. Does that have an operational effect?
Sorry thompson-mfr for kind of hijacking the thread.

Hi Cary,
So after all is said and done, would you say that you needed the inductance measurements or did the wideband meter alone allow you to set the MPS? I love shopping for tools, but there is a limit. I doubt I will need to measure inductance very often, but I can probably get my hands on one if it is important.

[JamesM]

Hi Cary,
So after all is said and done, would you say that you needed the inductance measurements or did the wideband meter alone allow you to set the MPS? I love shopping for tools, but there is a limit. I doubt I will need to measure inductance very often, but I can probably get my hands on one if it is important.

I would say the LCR is good for the initial setting, but to fine tune to the engine you need a wideband.

Just get both, used waveteks are pretty cheap and I think all cars should have widebands.

[cary]

inductance measurements

I felt the LCR made a huge change.
But the AFR makes sure you have enough fuel.

I'm a Tool Whore. I'm glad I bought both.

[worn]

inductance measurements

I felt the LCR made a huge change.
But the AFR makes sure you have enough fuel.

I'm a Tool Whore. I'm glad I bought both.

Yeah, me too. Another question comes from my physics classes in which a Henry was a Henry. In theory all instruments should measure the same plus or minus some tolerances. I understand that in some ranges a small instrument could not test a large inductance, but is there that much variation between appropriately matched testers? If so, why do they even show numbers?

[914_teener]

$1.19 for a five pack at Radio Shack.

Did you get the variable "pot" resister?

[cary]

No just a standard one. With heat shrink over it.