6v92 low on power

luvrbus · October 14, 2021, 06:50:12 PM

Quote from: gear jammer on October 14, 2021, 06:15:00 PM
no i havent removed the blankets, no broken clamps, yes i have a boost gauge, not guessing, ill have the prolink cable soon so i can check injectors etc, maybe the fuel this started after a fuel up but i didnt notice it til 200 miles after, i was on the highway for a couple hundred miles, noticed it in traffic, these things move slow off the line anyway, now its real bad.

They are slow out the gate and real bad on a slope to get started but once they sense the boost they move on

gear jammer · October 14, 2021, 07:44:55 PM

Quote from: Fred Mc on October 14, 2021, 06:48:21 PM
Just watched as video when the bus was down on power because there was an exhaust leak between the turbo and blower.

I watched that video. All my connections are tight it would have To be something broken like a manifold. Thanks

gear jammer · October 16, 2021, 11:48:22 AM

Howdy
OK I'm going to wait until I can get the prolink information when the cord gets here. Hopefully it will let me know if there's us injector problems. I'm thinking there is because of the smoke....

Then I'm going to pull it apart. Replace the exhaust manifold gaskets. And do a tune up. I'm seeing on the valve cover the injection timing is at 12 degrees btc The injectors are set at 1.520. The turbo is tv7512 with a 108 ar. 350 HP. My question is. Is this the best tune for this motor. I see injectors at all different heights. Anything I can change to get more performance? .

luvrbus · October 16, 2021, 12:05:24 PM

No that is advanced timing for less smoke and cleaner burn and the right setting for a DDEC with your turbo the 1.08 A/R is on the compressor side (cold side) the timing has nothing to with the amount of fuel delivered. You can bump it to 400 hp with a different turbo but you need the DD software to change the calibration on the injectors it's not worth it IMO

gear jammer · October 16, 2021, 12:28:48 PM

I thought the 1.08 at is the hot side? If it needs a turbo. I'd consider the 400 HP recipe
Thanks steve

gear jammer · October 16, 2021, 12:33:53 PM

The more I think about this the more I'm thinking a injector problem and a exhaust leak, it always blew some black smoke getting up to speed. Time will tell.

luvrbus · October 16, 2021, 02:02:05 PM

Quote from: gear jammer on October 16, 2021, 12:28:48 PM
I thought the 1.08 at is the hot side? If it needs a turbo. I'd consider the 400 HP recipe
Thanks steve

You need to remove the turbo to see the hot side A/R it is stamped inside the housing at the flange mounting.you would not notice the increase because it only gains a few more foot pounds of torque lol you would notice the extra fuel for the 50 hp though

sledhead · October 16, 2021, 02:43:40 PM

ya I wanted more power out of my 6v92ta so I fixed it with a cat 3406e

dave

gear jammer · February 15, 2022, 01:34:41 PM

Howdy, old post by me I know..
Well I finally found the time to get on this again. I decided to pull Al the exhaust plumbing off including the exhaust manifolds. I found a few spots in the gaskets that were leaking. All the plumbing was good and tight. No cracked manifolds. Or broken clamps. I'm going to do a tune up while I have it apart. A few questions, to do the valve adjustment I believe the Jake's have to come off. Is there anything I need to know before I pull them. Any loose parts that could fall out etc? Everything under the covers looks good. I did run the prolink on the cylinder cut out and it all checked out. I also going to set injector height, I have the tool. And I'm going to set them at 1.520 as the specs on the valvecovers. I'm thinking about changing the hot side turbo housing from 1.08 to. 96, any opinions on this. Thinking it would spool the turbo sooner. This idea is coming from a turbo guy
Thanks steve

lovetofix · February 15, 2022, 08:13:41 PM

Quote from: gear jammer on February 15, 2022, 01:34:41 PMI'm thinking about changing the hot side turbo housing from 1.08 to. 96, any opinions on this. Thinking it would spool the turbo sooner. This idea is coming from a turbo guy
Thanks steve

The guys at Leid Diesel in Newville PA are very knowledgeable with the two-strokes and super helpful. If you have any questions on settings or turbo specs give them a call.
Jonathan just helped me rebuild my 6v92TA and add Jakes. He setup the engine with 9G90 injectors and a different turbo and it ran 350-360hp at 2100 rpm on the dyno with zero smoke anywhere unless you slapped the throttle from idle to wide open throttle (that just gave a small black puff).
We did not put back the delay on the fuel rail and from 800-900 rpm you can snap the throttle wide open with zero smoke. He said that is only possible with the correct turbo.

gear jammer · February 15, 2022, 09:26:05 PM

Quote from: lovetofix on February 15, 2022, 08:13:41 PM
The guys at Leid Diesel in Newville PA are very knowledgeable with the two-strokes and super helpful. If you have any questions on settings or turbo specs give them a call.
Jonathan just helped me rebuild my 6v92TA and add Jakes. He setup the engine with 9G90 injectors and a different turbo and it ran 350-360hp at 2100 rpm on the dyno with zero smoke anywhere unless you slapped the throttle from idle to wide open throttle (that just gave a small black puff).
We did not put back the delay on the fuel rail and from 800-900 rpm you can snap the throttle wide open with zero smoke. He said that is only possible with the correct turbo.
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Thanks. I'll give them a call
Appreciate that