http://www.dieselplace.com/forum/uploads/chevy9465/2004-11-08_160439_Nov06159.JPGhttp://www.dieselplace.com/forum/uploads/chevy9465/2004-11-08_160607_Nov06156.JPG

I know that tip means alot to you. Great job.

here's the begining of my new exhaust. Nobody makes anything for old one's like minehttp://www.dieselplace.com/forum/smileys/smiley4.gif


http://www.dieselplace.com/forum/uploads/grape/2004-11-08_194143_MVC-011S.JPG

looks like someone got an early gift from santa in the form of a HUGE intercooler, wastegate, new turbine housing, new BIG downpipe, and a bigger turbo !! http://www.dieselplace.com/forum/smileys/smiley4.gif


T04 compressor family but what compressor wheel and turbine trim did you choose? Also what a/r on the turbine housing? BTW - did you have to have the turbo header custom built to move the turbo forward like that?Edited by: Bumpin' Yota

.68 a/r exhaust with a p-trim wheel, and a standard 60-1 inlet wheel in the T04S housing, with a 42mm racegate. I built the manifold out of a stock 6.5 manifold, been using the plasma cutter and the welder alot these days. Leftover stuff from my turbo mustang days. another one


http://www.dieselplace.com/forum/uploads/grape/2004-11-08_200511_Mvc-010s.jpg


Edited by: grape

I was just gonna say - looks like .68

I was considering it for my 2.0L Mitsubishi, but figured a bit too big.
Went with .58 A/R O-trim "on center" exhaust housing, TO4B V1/V2
compressor.

T04's are so cheap and so nice ... http://www.dieselplace.com/forum/smileys/smiley17.gif



Great job on fab work, are you going to weld that intake elbow right to the manifold ?


Edited by: shakmobil

Shuck,


Nice! Nothing like an original. what is just below the turbo, there?


http://www.dieselplace.com/forum/uploads/quantummechanic/2004-11-09_055311_6.2turbo.jpg


A guy could get ideas looking at your work!

That's the 43mm external wastegate, gm4/5/8 holset HK35s and most other factory turbos have an internal WG whose housing seat will crack over time. Externals dont have that problem. http://www.dieselplace.com/forum/smileys/smiley1.gifEdited by: Bumpin' Yota

Grape what boost you planning on running, about 15psig or more?

I shouldn't have to have more than 14 pounds to make well over 300 hp with that inlet wheel. The tight exhaust housing with huge wastegate area is just an experiment to see how well I can make the engine perform with light throttle loads, ie. around town, under 2000 rpm. The wastegate is 1-5/8" diameter while the exducer of the exhaust wheel is 2.75". To compare the GM series turbos have about 1-1/4" wastegate with a stage II T3 exhaust wheel which measures 2-1/8" at the outlet. All the math comes up to


GM exhaust area (exducer+wastegate) = 4.776 square inches based on this, a gm turbo shouldn't need anything more than a 3" exhaust pipe which has an area of 7.065 square inches.


My stuff area (exducer+wastegate) = 8.01 square inches, theoretically i could use a 3.5" pipe which has an area of 9.616 square inches.........but the 4" looks so cool.

*WHEW!* Im glad I wasnt using this turbocalculator incorrectly then. (I cant seem to select a good turbo for a 4.0L gasser intercooled v6 with the rpm range from 3700 to 6500 running about 10psi - the T76 turbo seems to be the only one to be capable of actually flowing that much air....


I was seeing great operation until you passed about 16psig, then the bar/lb per min points starting leaving the map and overspooling the compressor.


interesting...what pro/cons are there to having a huge wastegate in relation to exducer size?Edited by: Bumpin' Yota

BIGGER EXDUCER=MORE EXHAUST FLOW to turn the turbine--right??

more exhaust flow AROUND the turbine wheel allows a smaller A/R housing to get the boost up quick, and not to choke the engine at higher revs. Matching a compressor wheel is all about picking your target power first. Gas engines take about 10 pounds of air per minute for every 100 hp you plan to make, diesels take about 10 pounds of air per minute for every 80 hp you plan to make.

finally got a place to host all of my pictures, the completed downpipe and wastegate tube are now shown, had to change them up a little.

http://www.imagestation.com/album/?id=2135065383

Nice to see you have some pics but i'm not going to rush out and join that place just to view them...sorry dude.