Compound charging

[Kenneth]

Don't be so sure about the temperature. You have to take into account the efficiency of both stages, which will also compound.

This is one of the main benefits of compound charging; high boost levels at workable temperatures. The other benefit, is that you get the lower spool times of the smaller turbo(s). I'll agree, if you're not going for some large boost levels, then you're probably better off with just a pair of TD04s or something. I'm aiming for around 30psi, and obviously don't want the slow spool time normally associated with that, so compound should work out well.

[SEAN-NZ]

if space permitted, although i doubt it would, could there be a possibility of a small air to water inter cooler between stages?

[Nick Mann]

if space permitted, although i doubt it would, could there be a possibility of a small air to water inter cooler between stages?

You don't need a huge amount of space for these though, and they can be placed anywhere with the cooling for the water being completely remote. It's not a bad plan.

[Nick Mann]

http://www.ebay.co.uk/itm/Barrel-sty...b#ht_720wt_932

You can get all sorts of shapes and sizes, but something like this (It would need to be able to flow more!) should be able to be squeezed in somewhere.
Part of me wonders if one of these would help any stock setup.

[SEAN-NZ]

could run 2? just before each little turbo, that would add up to 580, althouh that could probably still be too low for some people

[Nick Mann]

There's loads of options. I have just bumped an old chargecooler thread as I thought we were going a little off topic here.

http://www.clubvr4.com/forum/showthr...r-intercoolers

[SEAN-NZ]

ahh, i just finished reading that thread, some interesting stuff on it

[Davezj]

just thought i would let you know, i did some measurements on inlet and exit air temps on a standard and 600x300x76 intercoolers fitted to my car. can't remember what boost presure this was i have it in another thread somewhere i think.
at the lower end of the temp range obviously the intercoolers do not cool down below ambient temp so below about 30 deg C inlet temp the outlet is about 20 deg C

the stock intercooler very roughly cooled the exit air to half the inlet up to 70deg C inlet then the exit air started to rise by more than half.
inlet exit
40 20
50 25
60 30
70 35
80 45
i presume it was coming out of it's effecint range and from then on it would just get less and less efficient at disapating the heat.

the bigger intercooler, cooler the exit air down to about 1/3 of the inlet temp. up to at least 80deg C.

my monitor for this has stopped working which was a UTCOM trip computer, so i can't do any more tests on it at present. but the limit of temp measurement is 80 Deg C so i could not go any high than this with the inlet temp.

when it is up and running again i might do a divide by 2 mod to the inlet temp so it would give me the ability to measure up to 160 deg C, althought it would diplay up to 80. not that the inlet temp should get anywhere near that figure, just out of interest though.
but first i have to get it working again and at the moment i have no idea why the screen is blank.