Does the MAP sensor vacuum pipe from the Inlet Manifold (in this case a swedish inlet) have to be a certain lengh or can it be whatever fits best?
Cheers Rich

 

Ford states:

The hose length from sensor to manifold should always be in the range of 280mm plus or minus 20mm

 

Was gonna say I remember seeing somewhere it should be about a foot.

 

I took that figure from the ford motorsport sierra prep book.

 

I remember someone saying it had to be a certain length, i'll make sure it's the right length tomorrow.
Cheers Rich

 

Didn't know this, think i had better check mine since i just chucked a random length of hose on.

 

Can't even remember where I heard it, just stuck in my mind when I was putting the Swedish Manifold on.

 

perhaps for unmodifed engine

if you change injectors turbo
put swedish plenum ...
do you think it's still important to have 280mm ???

I relocate my MAP with the swedish plenum and lengh will be 400mm ; I will just give the information to MSD


most important is to have a rigid hose (not silicon hose !!)

 

I can't really see why it HAS to be a certain length, within reason. I think the latency you'd incur by doubling or tripling its length would have no noticeable effects.

 

I cant see the ford motorsport prep book concentrating on a standard engine tbh.

 

find this on the site :

length and voltage on the MAP 3B

280 MM HG 0.66-0.76 volts
500 MM HG 1.36-1.45 volts
650 MM HG 1.81-1.91 volts
750 MM HG 2.11-2.20 volts


and the value volt / pressure for the MAP3B
Voltage Pressure
mv Kpa
0 0
250 17
500 33
750 49
1000 65
1250 82
1500 98
1750 114
2000 130
2250 146
2500 163
2750 179
3000 195
3250 211
3500 227
3750 243
4000 260
4250 276
4500 292
4750 308

 

Must check mine,