Tuffnol is a brand name for fibre reiforced phenolic (a plastic that used to be common for carb spacers.

If you go to Expansion tank isolation - Subaru Forester Owners Forum you can see the ones I made, I have some spare tuffnol somewhere as well.

Simon

 

Nice work.

 

This may seem a silly qiestion but, if you were running an aftermarket ecu and fitted these spacers, would the map need altering due to less heat build up?

Nathan

 

No.

 

No, but it would contribute to general heat management. If you did this, fitted insulating manifold spacers, heat wrapped your whole exhaust from headers to downpipe, you might have done enough to get a little more out of the map.

 

Very interesting, I did the bodge of just using heat reflective material without changing bolt positions so heat transfer still occurs.

Like P1 Mark's excellent setup...very tidy...not keen on the black FMIC pipework though as black material absorbs heat, better to reflect!

 

Black also radiates more heat...so if the pipe is hotter than the surrounding air, better to be black, if its colder, better to be shiny!

Simon

 

Doh, didn't think of that...good point.

I just use water injection on 3d map, sweet, ice cool.

 

Banny, I think there was some confusion. I was referring to inlet manifold spacers which RCMS keep in stock along with inlet manifold gaskets.
These are made in batches on CNC equipment.
If you buy a set of these, Olly will give you a spare Tufnol off cut and you can make your own header tank spacers.
Cheers.