2H Turbo Update

[arnott1t]

Thought I'd post a bit of an update on how the turbo is running. After I got it on and finally got the oil pressure problems sorted out everything has been going great. It produced about 10psi max boost and purred along on the highway at about 4-5psi. Noticible increase in power and felt pretty good. Recently though after reading more and more about the perforance build being done I wanted more power. It seemed like I wasn't getting as much boost as I could use so I thought I'd try and squeeze some more out of it. First thing I did was add more fuel. I got a midgen more but only for a second all though the response seemed quicker. After looking at my set up I realized I think my wastegate was opening at 10psi despite it recieving no boost signal. I'm guessing the manifold pressure was abe to overcome the spring of the actuator and slightliy open the gate.
To clarify the gate actuator was disconnected after install because it would open at about 1.5 psi. I simply unplugged the boost line from it so the spring would hold it closed. Seemed to be very effective and at first I was achieving up to 15psi with this. It would seem though that it weakened some how. So to make a short story long I wired it shut just to see....

Instantly I had a pile more boost peaking at about 17psi and the response was much better. Took for a very short drive and popped teh intake hose off the throttle body. Got everything re-tightened and went out again. The added boost cooled things down nicely and gave it even more jam. I can cruise up hills in fith that used to be relegated to fourth and third before I installed teh turbo. Pretty cool. EGT's are nicer and don't come up as fast. During my second drive I was goosing it heard a small pop followed by reduced boost pressure. I though I may have damaged the turbo but things looked ok. Turn out it was the intake elbow burrst on one of the corregations. This became my new wastegate.....until I "fixed" it temporarily with gasket maker and Duct Tape. I'll be ordering another elbow on Monday.

So now using the fuel I think I'll turn it down to 15psi max. It will likey only see 12-14 most times though as you'll really need to give her to get it all.

All in all, Turbo's are awesome.

 

[rchalmers3]

Thought I'd post a bit of an update on how the turbo is running. After I got it on and finally got the oil pressure problems sorted out everything has been going great. It produced about 10psi max boost and purred along on the highway at about 4-5psi. Noticible increase in power and felt pretty good. Recently though after reading more and more about the perforance build being done I wanted more power. It seemed like I wasn't getting as much boost as I could use so I thought I'd try and squeeze some more out of it. First thing I did was add more fuel. I got a midgen more but only for a second all though the response seemed quicker. After looking at my set up I realized I think my wastegate was opening at 10psi despite it recieving no boost signal. I'm guessing the manifold pressure was abe to overcome the spring of the actuator and slightliy open the gate.
To clarify the gate actuator was disconnected after install because it would open at about 1.5 psi. I simply unplugged the boost line from it so the spring would hold it closed. Seemed to be very effective and at first I was achieving up to 15psi with this. It would seem though that it weakened some how. So to make a short story long I wired it shut just to see....

Instantly I had a pile more boost peaking at about 17psi and the response was much better. Took for a very short drive and popped teh intake hose off the throttle body. Got everything re-tightened and went out again. The added boost cooled things down nicely and gave it even more jam. I can cruise up hills in fith that used to be relegated to fourth and third before I installed teh turbo. Pretty cool. EGT's are nicer and don't come up as fast. During my second drive I was goosing it heard a small pop followed by reduced boost pressure. I though I may have damaged the turbo but things looked ok. Turn out it was the intake elbow burrst on one of the corregations. This became my new wastegate.....until I "fixed" it temporarily with gasket maker and Duct Tape. I'll be ordering another elbow on Monday.

So now using the fuel I think I'll turn it down to 15psi max. It will likey only see 12-14 most times though as you'll really need to give her to get it all.

All in all, Turbo's are awesome.

Congrats on the successful install and subsequent "tweaking" to get her to fly! Sounds like the weak links in the intake are all coming due for replacement! You may opt for hard pipes and fiber reinforced silacon connectors like the rice racers!

Questions:

1) Please restate your set up: 5 speed, diff gears, tire size and any motor/exhaust mods?

2) When were you seeing 17PSI? Was it at or before 1800 RPM?

3) What RPM do you see boost starting?

4) I'm too lazy to dig... what turbo did you fit?

Thanks for posting your results, it's great of you to follow up on your install thread.

Rick

 

[Tapage]

X2 on the turbo that are you using .. I never got from my K26.8 more then 15PSI on HW and 2600 rpm .. shoule be little less rpm but only due to my intercooler ..

Which are your EGT readings .. ?

 

[rchalmers3]

Went back and found your install thread. I found these answers to my questions:

<<< I am turbo charging my 87 HJ60 with a 2H engine. It had 260k on the clock and runs like a top. Has great low end but needs something for hills and windy days on the highway. I am running 33" At's with 370 gears. I have a 5 speed as well.


The turbo I selected is a garret M27 with an A/R of .48 and .49 on the exhaust. I got it new of the net. I decided to run a flipped manifold and wanted as big of exhaust as possible. >>>

I'm still interested in how and when your install builds pressure, so give us a shout when you get a moment.

Rick

 

[rchalmers3]

X2 on the turbo that are you using .. I never got from my K26.8 more then 15PSI on HW and 2600 rpm .. shoule be little less rpm but only due to my intercooler ..

Which are your EGT readings .. ?

David, maybe he lives in a location with cold ambient air. Did you ever measure your cooler efficiency? I am curious as to what your system is doing for making and removing heat.

Rick

 

[Tapage]

David, maybe he lives in a location with cold ambient air. Did you ever measure your cooler efficiency? I am curious as to what your system is doing for making and removing heat.

Rick

sure here it hot ( much more right now but probably you already know that ) ...

I never take a temp measurement ( need to buy a laser temp gun ) but down the HW in the day ( hot day as usual here ) I never see my boost over 14 PSI .. on a cold night ( keep in mind my mean of cold about 22°C ) I can reach more than 16 PSI if I wand ..

And you " feel " you have more powa available ..

off course that only my impresion .. I promise buy a infrared thermometer and take some measurements ..

 

[arnott1t]

Boost come on early but not to ealry. I get noticable boost at 12-1400 when under load. Ticking along the highway at 100km/hr gives me about 8psi now. My max boost is at 3300 rpm or so. Not very usable. I can get 15psi at lower revs to say 25-2800 under load. Ya it can be cold here. -40f sometimes.....recent testing was done at about -10C. Finally starting to warm up. I was looking at intercolling maybe but we'll see. I have already ordered a new elbow and some hard pipe for the intake. That ought to help out. I also tuned the fuel down a turn or two and power seems a little less harsh now. I'd like at some time to take manifold pressures just out of curiosity....This motor now feels like my turbo'd 3b. Except this truck is quite a bit heavier. 6200lbs or so

 

[arnott1t]

forgot to add I tune for MAX EGT of 1200 f pre turbo. This is on long hill lugging to. the nice thing now is I seem to hit a ceiling at this temp since the boost is so high and it cools my engine down. My coolant temp starts to creep up though so I have to remove my cardboard winter front....