didnt read the whole thread, but turbos spool up from heat differential, not air flow, so it will spool up so slow, as there is bugger all heat left in the exhaust gases by the time you reach the muffler.

any way back to the topic at hand it seems there is more nay's then yay's so i guess that means no one really likes his idea. thumbs up for thinking out side the box and wanting to try something different.

Your right that it'll spool slower. But they do spool on exhaust gas flow. It's just that coming straight out of the ports the exhaust gas is hotter, under extreme pressure and the air has more velocity. It is pressure differential that causes the exhaust gas to want to escape out the restrictive turbo that makes it spool. Down the back of the car the air is cooler and moving slower, so there is less pressure difference to make use of.

 

didnt read the whole thread, but turbos spool up from heat differential, not air flow, so it will spool up so slow, as there is bugger all heat left in the exhaust gases by the time you reach the muffler.

Your right that it'll spool slower. But they do spool on exhaust gas flow. It's just that coming straight out of the ports the exhaust gas is hotter, under extreme pressure and the air has more velocity. It is pressure differential that causes the exhaust gas to want to escape out the restrictive turbo that makes it spool. Down the back of the car the air is cooler and moving slower, so there is less pressure difference to make use of.

 

 

yeah, what you said :P

 

driving a modified turbo diesel i learnt very quickly heat = boost seeings as they run what all the time, so i would hate to imagine how laggy this setup would be

to combat the length of pipe to the turbo would it better to use a smaller diameter exhaust to help keep pressures up when the gases start to cool. alot of R and D is needed for this to happen and work effectively but that doesnt mean it can't be done

I still can't beleive you fell for that electric turbo crap.....

I still can't beleive you fell for that electric turbo crap.....

 

I just got reminded of something I saw on A Current Affair a couple of years ago, some dude was importing this thing that you stuck onto the side of the engine (or fuel tank or something) that was suppose to do something magical (like ionise the petrol) and give you better fuel efficiency.

:rolls: oh here we go.

 

God bless Peter Brock may you be forever remembered with a total failure from the 80's

Cinky thanks for the support.

 

HEAT. OK. Thermal wrap.... Check (all i could do for heat) .

 

Should I mention that putting the turbo down the back may free up the use of headers that have been inertia tuned or that black art.... pulse tuning.

to combat the length of pipe to the turbo would it better to use a smaller diameter exhaust to help keep pressures up when the gases start to cool.

Brings back pressure into the game.

When the turbo is finely starting to make some boost, like i've been saying lag is going to be the biggest killer, it'll be fighting to overcome another problem. It'll be trying to force a fresh charge into the cylinder but the exhaust gas can't get out fast enough do to the small sized pipe knocking down the pressure on the turbo exhaust.

 

About the only real place to put the thing is around the diff.

 

Anywhat, i'm off to bed to dream about nascars and their diff mounted alternators.

Or hidden in a muffler housing ;)

Some basic "rule of thumb" for inside diameter of manfolds on turbo cars from some old school boys.

 

4cyl single turbo- 1.3 ltr = 1.25 to 1.5in exhaust tube Diameter 1.6 ltr = 1.25 to 1.625in , 2 ltr = 1.375 to 1.75 use the smaller size for the larger power band or larger size for top end.

 

But this is for a "normal" turbo set up

 

Then there is the other old rule, the exhaust diamater (ment for after the turbo) should be at least 15% larger than the exducer bore. so 1.3 - 1.6 ltr engine should be around 2.25 - 2.5in (thats producing up around 120 - 150hp per litre = fun).

 

Just putting it out there , I'm not sure how this is going to translate to what I'm doing but on first look I think if after the header I run the pipe size to the turbo around 1/4in larger than the exhaust port on the head, then this maybe a good balance providing enough flow and not to much restriction...... Just typing out loud. :hmm:

You will need to run an oil scavange pump from the turbo too. I've seen a few done and only two worked. A shop in Vic have a 400+rwkw xr8 works and is real stealth. The bloke over the back of my place has his mounted in the front wheel well on his 355 vl commo and that works awesome car has run a couple of 9.90 passes and sees heaps of street use. It is not out of the realms of being able to be done but turbo size needs to be dead on perfect. Way toooo much effort for me that's why mine is going in the bay.