Finally over New Years I was able to install my Christmas Present.
I got my Turbo upgrade from GDS.

I had to wait for all of the silicone parts to arrive because I had ordered them from 2 different online vendors.

Without getting too far into the install the upgrade was rather simple, I got everything finished in 1 afternoon.



The new compressor is huffing all six cylinders through a custom 3” crossover pipe into a free flowing inlet flange that I cut from plate steel.

Inlet is all 4” from the turbo where it transitions to 4½” into the stock air box drawing through a K&N filter being pressurized through an air scoop that sits boldly in the airstreem.

I do not want to go too much into the project at this time because there is going to be a more detailed story in the near future.

But here is my dilemma,
Now I seem to be in desperate need of more fuel, from a stop the boost will almost instantly snap to 30PSI and at WOT the needle goes off the end of the dial, it will pull strong up to about 85-88 MPH and then it seems to run out of power, EGT’s might spike at 1400* and then drop off because I am out of highway.

Also at WOT there is only a little haze.

My fuel pin is already set to it’s deepest setting and the full fuel screw is turned some but I do not remember just how much, star wheel I turned down 2 turns.

The pump timing is close to stock at this time.

Obviously I need to play with the full fuel screw but how much?



Also my VE pump has decided to start leaking again from the end of the governor shaft enough to be messing up my driveway.

Looks like my next repair is going to be to pull the pump and replace the o-ring.

Part #108 in my post.
https://www.dieseltruckresource.com/...15&postcount=9



So what do you think?

Thanks in advance for all of your comments.
Jim

BTW
For some reason this new turbo does not whine, I still have my 18.5 CM housing at this time, or maybe I just cannot hear it inside my soundproof truck.

 

Jim the slow down at 80 is normal. Try to adjust your high idle screw out. Both of my 89's did the same thing. My current 89 will turn to around 3100 before it defuels just with the high idle all the way out. I also had to move the throttle linkage on the pump to the next hole closer to the fulcrum of the pump linkage lever to get the extra travel. I found that it now is still in the power good when it shifts to the next gear. Before it was starting to defuel at every shift. I can do 65 or 70 now in second gear with my 727 3.08 combo. First is good for 45. Don't know what it will do in 3rd.

 

Ever thought of doing a DennyT pin?

 

Thats all our 727 3.07 truck would top out at that EXACT speed,

it had the basic tweaks and a 3200 spring like your truck. I wouldnt expect anymore top speed out of it with more fuel unless you get 60# valve springs to get more RPM. Grind your pin and washer a little and more fuel screw will make it more fun to drive on the bottom end. I dont see you getting more MPH with fuel mods....

Hope this helps,

Brandon

 

fun o meter needs to get that pump advanced....... straps, block of wood, wrenches,and about fifteen minutes back on the road, but it'll take over an hour to get the grin off your face

 

Jim, have you done the 3200 RPM spring yet?

Add some timing, that will help get your boost and EGT down a little.

 

with my 3200rpm spring they finnaly let off at 3600rpm, it just kept fueling. Not that I'm complaining though. lol

I like those boots and crossover, really clean looking.

 

Yes I have a 3200-RPM spring in the pump and it would pull up through 88 MPH according to the GPS even before I changed the compressor, it just feels like it needs more fuel to feed the turbo.

Is there any way to tell where the factory setting was on the fuel screw or was each pump different.

Usually how many turns can you go on the screw from stock to runaway? And does a turned up pump make it more susceptible to any kind of catastrophic failure.


Any idea why the turbo does not whine? Could this be from lack of fuel?

Could the leaking VE pump cause a drop in internal case pressure?

The new turbo modification is awesome; I just think it should be a bit stronger.

Thanks Jim

BTW
Mathematically what should the top speed be of a brick with an A-727 and 3.08 gears when the pump defules @3200 RPM?

 

jim some guys go a lot of turns some guys it only takes 2 or 3 turns it all depends on the truck. now as for me i got the denny t stage 2 and maxed the pump put a piston pump the egts are around 1250 but that is at wot. I wanna say mine was 4 or 5 turns and then it ran away (Scary) however i got it undercontrol now what i would do is go in half turn increments on the fuel screw until your satisfied with the power. just make sure you have the air inlet to the turbo off and a piece of metal or something to snuff it out if it revs to the moon on you. have fun by the way sweet truck love it

 

Hey Jim, nice thread as usual. One question just out of curiosity: What size is the reducer on the compressor outlet side? 2.5"? More info on that crossover pipe build would be stellar Thanks

 

ditto, and how is the spool up with the 18.5?

 

With 3.08's and a stock size tire 235/85/16's your lookin at 3274 rpm's at 95 miles per hour. That is with a direct hook up. That does not calculate torque converter slip.

 

I have heard when you play with the fuel screw, the truck will start eating up shut off solenoids. There may be a way to prevent that though. I think it has something to do with a VW part...

 

the quiet turbo in your case is because the stock air box I see in the pic. Open the air box up and get a high flowing filter and listen to it sing. lol

 

My first reaction is my, thats a nice, clean engine compartment.

What is that big white thing in the bottom picture to the far left by the PS pump? Do you have a coolant filter?