VEMS Engine management systems, plug & play ECU upgrade

[blade7]

There are various tasks that can be undertaken in the meantime. I need to find someone who welds aluminium - got to put an IAT sensor in the charge pipe between the intercooler and throttle body So need a bung welding in.

Usual place for the IAT sensor is in the inlet manifold by the throttle body. That's where Porsche fitted it on the 968 RS. Simple job to drill and tap there.

Sorry Paul but that's not the best place,

Pete

As Graham indicated Pete the inlet manifold was cast with a place for a sensor to be mounted there. I'd favour Porsche Motorsport over some bloke in a shed [][].

 

[Eldavo]

Pete - maybe getting confused here, as close to the intercooler either side would give you the drop and efficiency but this is for the MAP system so is a single sensor measuring the air actually reaching the combustion cylinders.

 

[PSH]

Pete - maybe getting confused here, as close to the intercooler either side would give you the drop and efficiency but this is for the MAP system so is a single sensor measuring the air actually reaching the combustion cylinders.

sorry, i didn't mean the sensors were for anything other than for me to see that the intercooler was working properly, I probably didn't explain that properly? It's nothing to do with metering for the MAF or indeed the MAP as fitted to my car.

Pete

 

[Eldavo]

i had an inkling that's what you meant. So the general consensus is to mount it on the manifold and use it as an excuse to get it re-powder coated too? (Because red is obviously the fastest colour).

 

[944 man]

Don't powdercoat it red...

 

[Eldavo]

Gold?

 

[924Srr27l]

Blue


R

 

[blade7]

Does powder coating have an insulating effect on the inlet manifold....

 

[GPF]

Yep.

Which is probably a bad thing - it prevents heat being dissipated from the manifold.

 

[PSH]

i had an inkling that's what you meant. So the general consensus is to mount it on the manifold and use it as an excuse to get it re-powder coated too? (Because red is obviously the fastest colour).

Oh sorry... I've not explained myself well enough again...mounting the IAT into the manifold is most certainly not the general consensus or even the correct place, you can get heat soak there which can cause havoc with your fueling/timing...you need to know where the manufacturer of your system recommends, if the software can't make allowances for heat soak you will have all sorts of problems, some of which could be very bad for the engine. It's not as simple as one may think, for my application/purpose mounting in the hardpipe before the throttle body is the best place, this is also the case for some ECU's, just depends on the ability of the ECU fitted. Remember our engine bay tends to be hotter than most. talk to VEMS before deciding where to mount the IAT, also some sensors are better insulated from external heat than others, a little research as to which is best for your chosen application may be prudent.

Pete

 

[924Srr27l]

A wet painted or dry (Powdercoated) surface will offer some insulation from radiated heat but also insulate the conducted heat in keeping it from any passing air.

Thermal barrier coatings are best as they keep heat away.

On a N/A engine, every 10 degree reduction in inlet air temperature can increase engine power almost one percent,
and on a turbo or supercharged engine, a 10 degree reduction in inlet temperature is good for up to two percent more horsepower.

My Intake has 3 different Paint materials on it (Dry / wet / Dry) so this probably absorbs & keeps the heat out! and it'll also run cooler than a stock one as it's Internal walls have been Extrude Honed with an Abrasive Putty in the USA, the Internal flow
(CFM) is improved by approx 25%

Exhaust Coatings are the opposite and The Hotter the better for increased scavenging..
Zircotec offer a Plasma Ceramic coating which is beneficial for more performance, as done on this Turbo Manifold.

R

 

[Eldavo]

Peep suggested the charge pipe between intercooler and throttle body but said it can be placed on the manifold if I wish.

VEMS guide suggests manifold but I'll ask Peep what he's done with his own car as he obviously recommends the charge pipe for a reason.

As ever Roger, your post started off semi-useful and appropriate until the inevitable use of the word "My" after which I shut off. If I wanted to know about your application I'd read your website, you've shown a phenomenal lack of knowledge around the Turbo model in the past so let's try and keep this thread content appropriate and useful as a future resource.

 

[PSH]

I would do as peep suggests then...fit it to the hard pipe and play safe...

Pete

 

[TTM]

I have tested the IAT sensor both on the flat spot with the standard intake manifold and now in the throttle body housing before the throttle blade and have not noticed any difference in how the engine ran between both set ups and never needed to adjust my IAT fuel trim table because of this.

As they rolled out of the factory the 968 turbo RS did not use any IAT sensor other than the one in the standard barn door AFM, but as race cars they were understandably modified as they changed hands, and even perhaps even the original owners were not satisfied with the OEM configuration. That's pretty much how it goes with race cars.

 

[blade7]

I had thought that myself (I popped into Gmund cars and had a good nosy at their 968 Turbo RS) but the vendor suggested in the pipe.

That car wasn't a "standard" 968 RS build, unless there's a picture of the engine as the car rolled out of the workshop who knows whether or not Porsche fitted the IAT sensor in the inlet manifold.

 

[924Srr27l]

As they rolled out of the factory the 968 turbo RS did not use any IAT sensor other than the one in the standard barn door AFM,

Are you saying the 968 turbo RS used a Barn door flap AFM , and not the hot air MAF like the 968 ?
R

 

[blade7]

Should be with me in about 4 weeks time and I'll get round to the install as and when I can after that. Depends how busy I am with work. I'll post an update when I get going...

Has it been delivered ?

 

[Eldavo]

Nope - had an email last week that it was being assembled. I think Phil was hoping it would be 4 weeks though.

Of more interest is that that he had an exhaust fitter make a new exhaust and downpipe and fit it without removing the Turbo!!!

 

[blade7]

Who made the exhaust and what dia is it ?

 

[Rorence]

Thanks for your nice post to teach us more in this field. After reading on here, we can learn more in this topic.