Of course you will be unaware of any AFR changes in different ambient air temps without an AFR meter onboard.alanbell wrote:my set up is. the pipe leaving the air box is 3 in via a rubber adapter it steps down to a 2.5 in flexible pipe which goes over the rad into the cavity between the body and the left side of the rad duct, then out of the cavity and down through the rad duct to the left intake of the grill. i did have to remove a small amount of fibre glass to get out of the first cavity other wise no cutting, even putting a pipe over the rad and into the cavity will get to colder air than that behind the rad.
i have not had any problems with afr, bear in mind that the post oct 88 cars got their air from in front of the rad., though they did have a system to get hot gasses from the exhaust when starting from cold.
I guess you mean that you haven't noticed any running differences? It's a bit of a chore to fit an AFR meter but you can easily fit a permanent air temp probe into your airbox to get an idea of the range of air temps your engine is using - - without these data it's all a bit 'suck it and see'.
Here's a cheap digital probe you could use for example -
ebay temp display & probe for a fiver!
I use two of these. - one probe in the nose to get true ambient air temp and one in the airbox to see how much it has changed by the time it reaches the airbox/engine - they work well and are very reliable ..and cheap.