Summer temperature = poor performance

[VWnut]

Hi chaps,
Is anybody elses car suffering performance losses form the heat.
My 16v seems to die off at 5500rpm when the outside temperature is hot. I fitted a ram pipe directly into the air box and mounted it on the front bumper to force cold air into the air intake. This has not made any difference at all. However, first thing in the morning or last thing at night, when the outside temperature is cooler, the car pulls so hard through the rev range to 7200rpm.
Is anybody else experiencing the same or has any ideas on how to combat this?
Tom

[Mk3 16v Anniversary]

Ask you boss if you can swap shifts!

[karmakanix]

Its all about volumetric efficiency, the opposite is that equally frustrating situation when it is a foggy peasouper and your car feels like you've dropped in nitrous yet you cant see past the washer jets.

not sure if it is easily curable, apart from getting the coolest airflow possible. There are various ways of faking cool air (nitrous, intercoolers, water injection (the latter 2 for turbo's), iced manifolds (for dragracers)) these all play with VE in some way.

I'm with Mk3, change jobs or move north...

[adyh]

*nods* it does sound that way , are you sure your not running rich ?

[VWnut]

The mileage is 90k. The injectors were replaced last year. I'm pretty sure it's not running rich, although i can't be certain.
The car only loses power at full throttle at 5000rpm onwards, if i back off the gas a little bit the car picks up again. I was told that it could be fuel pressure?

[VWnut]

Cheers mate, i will give that a go. I'll let you know how i get on.