Some guidance required!!!!

[topfuelman]

Awesome! My tuner had mentioned trying the alpha n table at the end of our session, so I think he is on the right track. I will pass your comments directly on to him and hopefully he can get this beast dialed in for me.

You guys are brilliant in my books. This stuff is a bit too complex for the way my brain is wired.

Cheers,

T

Since you are running the COS5 you should be able to utilise the alpha n (TPS VE Table) to aid in the tuning of this set up. This table was designed for the ITB or large cam engines with a weak map signal like you have.
If you log the GM.VETABLE_DMA pid once your main VE table is dialled in it will give you a starting point to tune this table.
Take a look here http://forum.efilive.com/showthread.php?t=2599 You will have to skip forwarda bit but it explains the process better than I could.

[5.7ute]

Steve (Oztrack) & Dan (Delco) have both tuned these ITB engines successfully. Hopefully one or both of them can chime in with a few tips to help get this set up for you.

[joecar]

There's more info on the TPS VE table in the COS5 thread (it's a pretty long read tho... 25 pages worth): showthread.php?t=2599

[topfuelman]

Skimmed and summarized the relevant info and comments from this 25 page thread on using this feature.

I believe this will be the cure we've been searching for.

Can't wait for the next tuning session on the Mustang dyno this coming weekend.

I'vel attached a Rich text format document summary (brief) in case anyone else finds this info useful.

Thanks for the awesome input!

T

There's more info on the TPS VE table in the COS5 thread (it's a pretty long read tho... 25 pages worth): showthread.php?t=2599

[topfuelman]

Say, My tuner thinks I may have screwed up my Map sensor as in his own words

" with large changes in airflow from about 40% throttle to 100% throttle there is no change in MAP signal. I understand the difference between static and dynamic pressure, but not of this magnitude. "

Does this sound like a MAP sensor issue?

I did accidently wire it up wrong and ran the car a few times before we determined there was no map signal. We rewired it and were then able to generate signal voltage values but perhaps not the full range the sensor was designed to deliver (due to the miswire???)

Here is the type of set-up I am working with. raw, and an installation shot win the chassis. There is a small volume plenum in the valley of the manifold casting for a map sensor and for brake booster vacuum source etc.

I've gone ahead and ordered a new MAP sensor to replace it, as it is 9 years old anyways.

T

[joecar]

Test your MAP sensor using a MityVac style hand vacuum pump, observe the MAP pid on the scantool as you apply vacuum.

Yeah, if it's old replace it.

Double check your wiring.

Nice manifold...