One for the Megasquirt guru's

DaveEFI · Post by **DaveEFI** » Tue Jul 03, 2012 8:07 am

You could try insulating it temporarily. If it helps, make a neat job permanently.

SimpleSimon · Post by **SimpleSimon** » Tue Jul 03, 2012 8:33 am

Mine is down in the nose now (in front of the rad) right next to the air cleaner most people mount them in a tube where the Hotwire AFM once lived on RV8 TVR's I tried this but I didn't like it (too close to the exhaust) and liable to heat soak

Coops Data-logging is your friend as mentioned already

I know your Admin Coops but shouldn't this be under the "Electrical & Ignition Area" ?

...

DaveEFI · Post by **DaveEFI** » Tue Jul 03, 2012 9:41 am

I did wonder if it was just convenient that the flapper one was in the flapper unit - rather than ideal. You've convinced me to move mine closer to the actual air intake. Which would be further away from the exhaust manifold heat.

Post by **Coops** » Tue Jul 03, 2012 6:38 pm

SimpleSimon wrote:Mine is down in the nose now (in front of the rad) right next to the air cleaner most people mount them in a tube where the Hotwire AFM once lived on RV8 TVR's I tried this but I didn't like it (too close to the exhaust) and liable to heat soak Coops Data-logging is your friend as mentioned already I know your Admin Coops but shouldn't this be under the "Electrical & Ignition Area" ? ...

your right mate, but at the time it was a fuelling lean issue, which maybe now something completely different

will move it there now:

And to carry on, anyone have a pic of there ignition map on MS for a RV8?
mines doing some werid things and maybe causing the lean issue, only said maybe

we had mine set to run 10 deg adv at idle, but to do this had to put the value of 20 in the ign table, today started the car up from cold first time since the weekend trip back from the pod,(never been a problem when cold always hot), the car was hunting and going lean the normal then lean on the tech edge gauge, ran and got the laptop and the ign adv gauge on Tuner studio was reading 20 deg adv, its started reading the table value correctly for some reason, any ideas, dropped the value to 10 and idle smoothed out and the car richened up again,

failing that the car runs well sweet

P.S what have you wrapped your intake pipe in? and where did you get it mate?

SimpleSimon · Post by **SimpleSimon** » Wed Jul 04, 2012 7:49 pm

Hi Coops, cant help with the Ign map at the moment as i dont have the laptop with me (daughter uses it) but the intake wrap i purchased from Ebay some years back similar to this stuff http://www.ebay.co.uk/itm/Heat-Shield-A ... 3360c03a43

Post by **Coops** » Mon Jul 30, 2012 6:23 pm

May of sussed the lean hot start now,
looks like the car is drawing too much heat from the engine,Radiator exhaust etc,
had the filter and IAT hanging out the front of the engine bay on a flexible hose and the IAT sat around 19C at idle, and when hot started was at 24C but dropped back down ton 19C within 40secs, (would of been around 70-80C if in engine bay)
so new filter and enclosed housing waiting to be ordered that has a cold feed pipe to go to the front grill, fingers crossed this eliminates any engine bay heat getting into the system,
also moving the IAT from above the N/S exhaust mani helped a bit too,

next thing, where should i mount it now? as on my nissan the IAT is in the pipe GOING to the air filter not from filter to engine,

SimpleSimon · Post by **SimpleSimon** » Tue Jul 31, 2012 10:32 am

Well done coops

mine may as be in the air filter itself now its that close, I have it well away from major heat sources (i.e exhaust) and the nearest is the radiator and that does not spill enough heat into the air cleaner location to affect my IAT sensor by more than about 15 degrees and that's when its really hot, due to its close vicinity to the front intake/grille I don't get heat-soak as such any more

I just think its better to do your best with sensor location than trying get around temp scaling in software

I am still learning

Post by **demo2** » Tue Jul 31, 2012 11:45 am

Thats strange, i had mine in the filter and Rob from V8 dev said put it in the plenum, guess i'll find out when car gets 2 that stage.

DaveEFI · Post by **DaveEFI** » Tue Jul 31, 2012 12:28 pm

demo2 wrote:Thats strange, i had mine in the filter and Rob from V8 dev said put it in the plenum, guess i'll find out when car gets 2 that stage.

Well, Lucas/Bosch put it in the AFM rather than plenum. Wonder why since it could equally have gone in the plenum which was a clean sheet design for injection?

I'm going to try mine in the air filter (standard SD1 EFI type) which is about as far to the front of the car as possible. Anyone done this and got some tips on the mechanics of fitting it there?

Post by **Coops** » Tue Jul 31, 2012 3:38 pm

our make shift setup to see if she hot starts any better and she did,
and yup the IAT sensor was placed inside the filter

JSF55 · Post by **JSF55** » Tue Jul 31, 2012 6:55 pm

You need one one of the land rover snorkel scoops up the windscreen now

Post by **Coops** » Tue Jul 31, 2012 6:59 pm

JSF55 wrote:You need one one of the land rover snorkel scoops up the windscreen now

SimpleSimon · Post by **SimpleSimon** » Tue Jul 31, 2012 8:30 pm

demo2 wrote:Thats strange, i had mine in the filter and Rob from V8 dev said put it in the plenum, guess i'll find out when car gets 2 that stage.

If you fit the IAT into to the plenum it will heat soak like a bastard

most who have tried this on the RV8 have moved it shortly after

Coops where you have it is great

how you gonna shut the bonnet though?

seriously though that should be ideal, time will tell i guess

Post by **demo2** » Sat Aug 04, 2012 1:37 am

Here is a copy of a facebook message rob(v8 dev) sent me regarding sensor location:
its not mega important to run the ait in the plenum, but i allways try too, the plenum temp is allways hotter than where the filter is, actually the filter is a poop place to put it, sitting in traffic, the plenum temp could reach 50-60deg while the filter is only 20 uk temps:-), drag away from the lights and there are your pistons gone through det!!

I will put a bung in the hole in the airfilter where i had it incase i do need to move it back. Rob must have a way round this heat soak prob if he puts it in the plenum, we will c

DaveEFI · Post by **DaveEFI** » Sat Aug 04, 2012 7:28 am

What I'm not clear about is how well an ATS measures the actual air temp and how much it is effected by what it is mounted in. And how much the air gets heated by the plenum, etc? Also, air isn't a particularly good conductor of heat, and the sensor can only measure the temperature where it is - not for example in the middle of the air stream.