egts with tst???

[SRadke]

I got mine in tonight and I'm totally impressed.



Tomeygun, I see what you're saying about the boost elbow. When I drop the hammer the boost shoots up to 40 where the wastegate opens and the boost falls off to 25 and then climbs back up to level off at about 35. This surge in bost is also accompanied by a surge in power that I would say is proportional to the boost numbers, very noticable. So much so the first couple times I thought it was my clutch letting go. Let us know if the EZ elbow smooths it out.



-Scott

 

[Lonestar]

EZ boost elbow.

When I had my PMCR installed, I was running the EZ elbow, and I never noticed any surges in the boost. I actually peaked at 43lbs of boost a couple of times which just might be a little much for that stock turbo



My biggest problem was my turbo/manifold and the intense pressure and heat that was created. I was creating enough manifold pressure to float the valves which was NOT a good thing to do.



KEEP ON TRUCKIN'

Lonestar

 

[kbond]

Our engines were originally designed for 2500 RPM



Where did you get this from?

 

[Tomeygun]

Originally posted by SRadke

I got mine in tonight and I'm totally impressed.



Tomeygun, I see what you're saying about the boost elbow. When I drop the hammer the boost shoots up to 40 where the wastegate opens and the boost falls off to 25 and then climbs back up to level off at about 35. This surge in bost is also accompanied by a surge in power that I would say is proportional to the boost numbers, very noticable. So much so the first couple times I thought it was my clutch letting go. Let us know if the EZ elbow smooths it out.



-Scott

Which elbow are you running? Stock or the TST adjustable one??

 

[Tomeygun]

Originally posted by Lonestar

When I had my PMCR installed, I was running the EZ elbow, and I never noticed any surges in the boost. I actually peaked at 43lbs of boost a couple of times which just might be a little much for that stock turbo



My biggest problem was my turbo/manifold and the intense pressure and heat that was created. I was creating enough manifold pressure to float the valves which was NOT a good thing to do.



KEEP ON TRUCKIN'

Lonestar

LONESTAR --- on what setting did you hit 43 LBs with the EX elbow ?? thats too high for my comfort... AND i notice that "knock" you had only when I race stoplight to stoplight... like the truck doen not like to RUN all-out and then slam on the binders, but If i coast at say 20% pedal, there is no knock... And I have never had it do it more than once in a hour period, FWIW

 

[Lonestar]

I hit the 43psi on the 9X9 setting. I was reaching 40psi consistently on 7X7. But once again, I knew this was totally out of the Turbos range. Like I said before, the Manifold pressure created by the back pressure from the turbo was so high that it would cause the valves to float or stick.



This was what Mark and I determined after a rather lengthy phone call going over my troubles.



Tomeygun, I'm just glad that someone else has experienced the "knock".



Mine originally would only knock after a short full throttle burst on a high setting. But eventually it got to the point where it would knock on 3X3 after milder acceleration. I used the truck to tow my boat (13000lbs) with the TST on level 4X4, and the power was about perfect for towing... but when decelerating with the boat pushing the truck it would knock continually



I think I may try the PMCR again once I replace my Turbo, Manifold, and strengthen my valvetrain.



Like I've said before, the power is phenomenal, but it isn't worth tearing your engine up.



KEEP ON TRUCKIN'

Lonestar

 

[Prairie Dog]

The knock or turbo bark even happens with a stock engine under the rite conditions. I could get mine to do it going up hills in 6th, pulling a trailer and downshifting to 5th at 65 under heavy throttle. I also noticed the TST exacerbates the condition. The trick is to change the RPM at which you let off the throttle and let off gently.

It's not TST's fault of course, any mods that make this much power and don't replace the turbo are going to cause bark.



Scotty

 

[Lonestar]

I'm totaly aware of the surge tendencies of the turbo, this is not what I am talking about. The know we are speaking of is in the engine itself. Whether it be a misfiring injector or something in the fuel pump it is definitely not a comforting noise. I totally agree that a customer not having a properly equipped truck to handle the TST isn't TOTALLY TST's fault. Now I think TST should change their wordage on their website when advertising that the numbers they achieved are using STOCK turbos exhaust etc. But that's just my opinion.



KEEP ON TRUCKIN'

Lonestar

 

[Tomeygun]

could a higher pound spring be the answer? (just thinking like a drag gas engine, but they float valves at 7000 RPMS)



So you think the manifold presssure is holding the valve open, right?? MORE so when coasting, when you have the turbo turning, but with no thorttle input... Like I mentioned, it happens to me only when I get on it pretty hard and then coast for a long time, and then i will knock, with a "jerk" of deceleration too.



That worried me when you say that it got worse with time... I hope not.



So far I have tried a high of 7/7 , and the wastgate about broke trying to lasso that boost back down, so maybe I will try 9/9 but with a grain of salt



LAST WORD... lonstar - you had DD3's the whole time right?

your power before TST - 350 rwhp ? (with tst, 500?) woah!

my power before tst - 200 rwhp ?



I think you hitting 43 lbs on 9/9 makes sense now - with injectors and all... I hope not to go over 35 lbs



good luck with the turbo and manifold bombs!

 

[SRadke]

Originally posted by tomeygun

Which elbow are you running? Stock or the TST adjustable one??

TST elbow.



-Scott

 

[Tomeygun]

Originally posted by SRadke

TST elbow.



-Scott

ok, well, I will let you know just how good the EZ elbow does as SOON as the freaks from UPS get it to me. . (DTT sent me one, it left on wednesday)- arg, I hate to wait

 

[SRadke]

I'm working on the fluxuating boost issue and I don't believe it has much to due with the elbow. I did a series of WOT runs in direct (4th on my 5-speed) from 1300 to 2900 rpm with the stock elbow. Any setting below 5:5 I couldn't get conclusive results from but when I got above that things started to become more apparent.



There was a "dead" spot at 18-1900rpm. I really noticed it with the settings that produce smoke. Low end the black smoke rolls, 18-1900 rpm the boost falls off the smoke clears up, and at 2000 rpm the smoke returns the boost climbs back up and your set back in the seat again. I hesitantly use the terms "dead" and "smoke" but even in the "dead" spot there is still more power than in stock form and the "smoke" was in no way a black out the sky kind of thing.



Basically I'm thinking the fluctuating boost is more due to fluctuating fueling than the wastegate. Why else would the smoke clear at the same time the boost drops? I intend to call TST on Monday and ask some more questions. And please, someone else try this and tell me if you find similar results.



-Scott



On edit: I should add that I was able to hit 38 lbs of boost on setting 7 torque and 9 hp with the stock elbow.

 

[chessie-system]

Originally posted by kbond

Our engines were originally designed for 2500 RPM



Where did you get this from?

This was the original governed engine speed limit for the first series of "B" engines.