hee hee

nooooooooo, its a very light subframe in total, and you lose all the original.. in weight its about a 1-1 swapout + 20 Kilo..

its on the back.. kewl...

now for some serious stuff lol... anorak on...

heres a graphical overlay of my plotted figures on an MHI TD04 turbo housing..... this will be the one I will use for the project.

the lines going up the graph (the straight ones - are plotted from my new spreadsheet (5am this morning OUCH !).. crappy layout, but seems to work...

they are a plot of airflow through the engine at a specific pressure ratio

the lines represent 2000, 3000, 4000, 5000, 6000 and 7k plots for pressure ratios from 1 to 2.7

to work out boost...

boost pressure= 0 to 14.7 * 2.7(pressure ratio chosen MAX) - 14.7

so... the verticals are the rpm plot against cfm of airflow (how much air ya have ta pump lol) - at a given pressure ratio.

the bottom line is this..

if the plot lines fit within the compressor map from the manufacturer.. and dont go too far left (Surge and Stall) and too far right of a line drawn vertically from the max flow point.. then anywhere past that line is fine ! (that line isnt drawn on the map.... you need to add it... anything up to the line is fine.. above that you reach compressure build up.. ie, it cant flow anymore..)

we have a turbo suited to the engine charactersitics of a clio 172... ar boost pressures from 0 - 25 psi !!!

as an idea.. at 6250 rpm (max bhp on a 172) at a realistic intercooler outlet pressure of 23 psi.. then the cfm requirements of the compressor are multiplyed by the ratio of the pressure increase.. the engine still only breaths exactly the same CFM as before.. but this time the air is twice as dense.. but we get more gogo

How much power ??

How about....

engine hp potential 295.7 hp @ BSFC=0.7

engine hp potential 345.0 hp @ BSFC=0.6

engine hp potential 413.9 hp @ BSFC=0.5

the BSFC for this unit .5 (more or less)

lets presume .5 at boost..

hmmmmmm.. wheres me big strap for the main bearings LOL..

Joe

)ps.. the map fits kewl.. the 2000 rpm line (at the left) is skewed due to a bug in me math ...

will look at it tomorrow when I have not been up too long..

http://homepage.ntlworld.com/captainslarty/172/td04h-18t-cfm.ovlgif.gif>