What MAP is normal for naturally aspirated engines

Da GMan · Post by **Da GMan** » Thu Feb 12, 2015 10:26 pm

Hi Guys

What is the nomal range MAP for aturally aspirated engines? I think I have a problem as mine only ranges between 20 and 40 yet the tables go right up to 100?

I have stable ide and have tried VEAL which has done a great job at making the buggy drivable however it seems very slugish and putting your foot flat results in a slow laboured increase in speed, but it does eventually get there. It just feel like it is holding back, waiting for or missing something, also the engine is pinging.

Ford Pinto 2.0L, 4 CYL, Throttle Body, Fuel Only at this stage, Timing 8Deg BTDC (As Per Engine Manual)
Microsquirt V3 - V3.83 - TunerStudio v2.6.14
All sensors including MAP purchased from EFI and are new.

I have attached a log file if anyone could point me in the right direction. (Be Kind). I am thinking plumbing problem or vacume leak but I am really guessing.

2015-02-13_14.35.15.msl

2015-02-03_13.22.20.msq

trakkies · Post by **trakkies** » Fri Feb 13, 2015 1:54 am

How have you derived the vacuum feed to the MAP sensor?

Da GMan · Post by **Da GMan** » Fri Feb 13, 2015 5:15 pm

trakkies wrote:How have you derived the vacuum feed to the MAP sensor?

Hi Dave

I have it connected direct to the inlet manifold, it also goes to the Vacume advance on the distributer. The Brake booster is also connected to the inlet manifold.
(Sorry am not near the car atm)

The inlet mainifold has two connections on it, MAP and Vacume Advance on the one side (shared) and Brake Booser on the other. I will get a photo in a few hrs.

Da GMan · Post by **Da GMan** » Fri Feb 13, 2015 7:01 pm

Ok here is what I have got, due to space it is hard to get a clear picture.

Brake Booster Connection

IMG_0174.JPG

This is the other side which is easier to get a photo of, just to the left of the green knob is where the MAP and Vacume advance are connected, just on the other side of the intake manifold

IMG_0175.JPG

Da GMan · Post by **Da GMan** » Fri Feb 13, 2015 7:04 pm

This is the MAP and vacume advance connection, it is hard to see where it is on the manifold due to the cramped space. There is a T Piece just out of picture spliting to both.

IMG_0173.JPG

trakkies · Post by **trakkies** » Sat Feb 14, 2015 2:06 am

With the engine stopped, what does the MAP gauge read in TunerStudio when it's on line?

Da GMan · Post by **Da GMan** » Sat Feb 14, 2015 6:20 pm

Hi Dave

It does start out at 100kpa but I think I have found the problem. The brake booster pipe had a small crack in it and once replaced the map now reaches 100kpa again.

Thanks so much for your time, I guess I need to tripple chack everything when things don't go as expected.

Gav

kjones6039 · Post by **kjones6039** » Sat Feb 14, 2015 7:17 pm

Da GMan wrote:The brake booster pipe had a small crack in it and once replaced the map now reaches 100kpa again.

Pardon me, but I am not clear on this. When is map reading 100 kPa?

Ken

Da GMan · Post by **Da GMan** » Sun Feb 15, 2015 3:41 pm

kjones6039 wrote:
Da GMan wrote:The brake booster pipe had a small crack in it and once replaced the map now reaches 100kpa again.
Pardon me, but I am not clear on this. When is map reading 100 kPa?

Ken

Hi Ken

It starts at 100kPA with the engine not running and Mirosquirt powered on, once started it drops to around 20kPa at idle. It also gets back up to 100kPA under acceleration, say if you free rev the engine from idle not under load.

I did a short drive but as I was alone I could not see the screen as it was closed (but still running VEAL) (to prevent problems with the Men in Blue

). I did open the screen and accelerated and while it did not reach 100kPA it did go beyond the 20-40kPa range I was previously seeing, cells were also changed all over the table by VEAL rather than just in the 20-40kPa rows changed last time. I did need to adjust the timing at the distributer (Fuel Only Setup) after replacing the brake booster pipe and now seems much better.

Am I on the correct path? I just assumed that something was wrong as I was only using 2 - 3 rows for my tune rather than the whole table and it was not running that well. I did Goolge kPa for my engine but did not find any usefull results. Now with using more of the table it seems much smoother and after a 15 min drive was behaving much better than the last try.

Da GMan · Post by **Da GMan** » Sun Feb 15, 2015 5:33 pm

Wow reading that it does seem I am unclear in my answer so I'll try again.

1. It is at 100kPa with the engin not running and Mirorsquirt powered on
2. It used to aftter starting only go between 20 and 40kPa while driving
3. I replaced the brake booser pipe
4. Now it is 100kPa with engine not running and Mirorsquirt powered on
5. It is now +-20kPa at Idle
6. It now reaches +-100kPa with free reving the engine (Not just 20-40kPa)
7. VEAL now edits/changes a lot of the table, not just the rows between 20 and 40kPa

That hopefully is much clearer

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What MAP is normal for naturally aspirated engines

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