EAE + long MAP hoses

natesully · Post by **natesully** » Wed Aug 08, 2007 10:13 pm

Is anyone running long MAP lines (a few meters or more)? Will placing MS behind the passenger seat kill my EAE with evil lag?

Post by **muythaibxr** » Thu Aug 09, 2007 7:07 am

You could measure that yourself actually...

I'd think it might slow things down a bit, but I'm not sure it'll give you "evil lag."

The easiest way to find out is to put a really long MAP line on there without moving the MS to the new location. Whether it runs different or not, you'll have your answer, and for the cost of a few feet of MAP line (probably not expensive.)

Ken

natesully · Post by **natesully** » Thu Aug 09, 2007 3:47 pm

I would- but my car will not run, I have MS wired to the new location (factor computer harness) already. My guess is it won't be that bad, since the vacuum pulses travel at the speed of sound, and I don't think my valves or throttle have broken the sound barrier lately.

krisr · Post by **krisr** » Thu Aug 09, 2007 3:51 pm

I would personally run a external GM map sensor under the bonnet and run your map signal wire out through the wiring harness into the engine bay instead of a vacuum line that long.

Kris

natesully · Post by **natesully** » Thu Aug 09, 2007 5:39 pm

I think I'll just run the MAP line for now, but I'm gonna go with the GM MAP sensor as soon as I can order one. The stock MAF wires should suffice for a harness. Good idea!

mtlcafan79 · Post by **mtlcafan79** » Thu Aug 09, 2007 7:44 pm

I run 12' of vacuum line to my MS box. Seems to work just fine to me.

rb26dett · Post by **rb26dett** » Fri Aug 10, 2007 12:56 am

somewhere around (the manual probably) it says bruce n al did an experiment with 30ft of hose, and couldnt measure the delay... should be sweet provided its not huge/tiny hose.

Jon k · Post by **Jon k** » Fri Aug 10, 2007 3:57 am

Can you remote mount the map sensor, or is there concern with noise at that point?

rb26dett · Post by **rb26dett** » Fri Aug 10, 2007 4:36 am

yes, and many do, but i'd be paranoid about noise before i was about the throttle plate doing mach 4

zsilinszkyz · Post by **zsilinszkyz** » Sun Aug 12, 2007 11:10 pm

I think the pressure wave will travel with the speed of sound, that is ~340 m/s at 20 C. You'll have a 3ms delay for each m of the MAP line then.

wes kiser · Post by **wes kiser** » Thu Aug 16, 2007 7:28 am

When I first installed mine, I had a gm 3-bar mounted under hood with 1' of hose. I then changed to a board mount 3-bar with 8' of hose. Couldn't tell a difference in anything.