Post 802125 by petrolh34d on 2016-06-17 01:24:59
Because it's positioned directly above the turbo and exhaust manifold, a lot of heat gets conducted into the inlet manifold.
After driving the car for a while, the inlet manifold is pretty hot to the touch, which would would surely negate all the cooling that the intercooler has just done?
I'm toying with different ideas for trying to prevent this including, heat wrap, carbon heat shield, and naca bonnet vents and louvres.
Would it be effective to set up some sort of venting system whereby air is taken in through the front of the bonnet, ducted past the inlet manifold, and then use louvres at the rear of the bonnet to exhaust the heat?
I'm open to suggestions and alternatives.
Here's a very rough, and incredibly not to scale diagram of what I'm proposing.
[ATTACH=CONFIG]30797[/ATTACH]
Post 802126 by martin_r_smith on 2016-06-17 06:36:17
With over 230bhp (soon to be more ;)) I've not found the need for it yet. I wouldn't worry about it or waste money on it myself.
Post 802131 by p fandango on 2016-06-17 07:50:10
i removed the rubber seal at the rear edge of the bonnet
Post 802134 by martin_r_smith on 2016-06-17 09:39:24
[QUOTE=JT;802128]I use 1 of these:
https://www.ipdusa.com/products/5210/115032-phenolic-intake-manifold-spacer[/QUOTE]
Be good if they did one for the tdi..
Post 802136 by JT on 2016-06-17 09:54:23
[QUOTE=martin_r_smith;802134]Be good if they did one for the tdi..[/QUOTE]
just an idea, I have no idea if they make 1 for the tdi...
Post 802139 by martin_r_smith on 2016-06-17 10:48:11
unfortunately not, there is nothing really that's made specifically for this engine.
It would be of no performance benefit on a tdi either, the engine doesn't know if it is getting hot, warm or cold air post turbo as it only measures at the maf. And unlike a petrol there is no lambda sensor to tell the ecu what the mixture is doing so it cannot compensate for a greater or lesser quantity/ density of air and adjust fuel accordingly. The fueling is basically metered by inlet temp at the maf, manifold pressure and throttle position (plus a few others like fuel temp etc), so even if you got the post intercooler temps to say 10 degrees but the temp at the maf is 24, it will still fuel for 24 not 10.
Hope that makes sense.
Post 802194 by petrolh34d on 2016-06-18 23:18:47
Thanks guys, some helpful info there.
I didn't know that was the way that the fuelling was ratioed Martin. It seems odd to me to go to the bother of intercooling the charge, and then porting it into the engine via a hot intake manifold.
So the most important thing to consider regarding power is the air/fuel ratio, which is determined purely by the MAF?
If the fuel ratio is unaffected after the MAF, how does the intercooler affect the equation?
Thanks
Post 802199 by M-R-P on 2016-06-19 00:44:07
[QUOTE=petrolh34d;802125]Because it's positioned directly above the turbo and exhaust manifold, a lot of heat gets conducted into the inlet manifold.
After driving the car for a while, the inlet manifold is pretty hot to the touch, which would would surely negate all the cooling that the intercooler has just done?
I'm toying with different ideas for trying to prevent this including, heat wrap, carbon heat shield, and naca bonnet vents and louvres.
Would it be effective to set up some sort of venting system whereby air is taken in through the front of the bonnet, ducted past the inlet manifold, and then use louvres at the rear of the bonnet to exhaust the heat?
I'm open to suggestions and alternatives.
Here's a very rough, and incredibly not to scale diagram of what I'm proposing.
[ATTACH=CONFIG]30797[/ATTACH][/QUOTE]
But the inlet is at the front of the engine...
Post 802202 by Doingitsideways on 2016-06-19 01:03:22
[QUOTE=M-R-P;802199]But the inlet is at the front of the engine...[/QUOTE]
Not on the derv, Martin
Post 802203 by M-R-P on 2016-06-19 01:11:03
[QUOTE=Doingitsideways;802202]Not on the derv, Martin[/QUOTE]
oh.
:P
Post 802205 by martin_r_smith on 2016-06-19 09:29:02
The intercooler does not affect the fuelling at all, it is simply there to bring the air temp down to something similar to the air going in at the maf. These old dervs don't have clever management and many assumptions are made rather than using sensors for feed back.
Post 802225 by petrolh34d on 2016-06-19 13:05:45
[QUOTE=martin_r_smith;802205]The intercooler does not affect the fuelling at all, it is simply there to bring the air temp down to something similar to the air going in at the maf. These old dervs don't have clever management and many assumptions are made rather than using sensors for feed back.[/QUOTE]
Cool. So it's basically guess work after the MAF, as the intake temperature can change without the MAF actually knowing.
I think I'm gonna have a stab at some sort of ducting system, purely our of curiosity and the desire to experiment.
Nice Claymore! I think it may have been seeing your design some time ago which has subconsciously inspired me.
Did you have an Integrale vent on your bonnet at one stage?
