GU 4.2 TD getting warm but have been playing

[chips59]

As above, the Old girl is getting a bit warm lately, normally sits on around 85* but has been getting to 105*, cools straight down as soon as you level out or get on the flat.

Now I have been playing with the inlet air, I have increased the inlet to the air box to 100mm, bigger snorkel and out of air box to 80mm.
I have not increased the fuel at all.
Have also noticed it takes more time to spool up.

So, could this be running a bit lean and making the temps rise?

cheers.

[thehanko]

this sounds odd, but bigger might not necessarily flow as well as you hope, through turbulence or no bell curve on the lips of outlet etc? - if its taking longer to spool up and getting hot im guessing its your new intake system.

if the air is restricting somewhere - less air = richer mixture = more heat. and could also explain laggy turbo.

but could also be entirely unrelated...

[chips59]

thanks for your reply, you could be right so will look into this.
You would think bigger would be better.

cheers.

[thehanko]

It is but if the flow pattern isn't as good it can effectively restrict flow. It wouldn't be my first guess normally but since that's what's changed it's where I'd start.

[christo400]

Check to make sure you dont have a boost leak between the turbo and intake as this will make temps rise and power fall. do you have a pyro & boost guage fitted ? as this will show you things have changed .