Turbo freespooling!

[RibbleConstruction]

Ive never heard of that before. The shop working on my truck called and said I am setting myself up for disaster. They say having an unrestricted exhaust will make my turbo freespool and wear out faster. I have never heard of this. What do you pros think? Chris, Fred, Johny, Whats up with this? Ive run it this way for 20,000 miles. Do I need to put something on? Egt's have been good so I figured no problems.
Jon

[wyldman]

It won't hurt a thing.Decreasing exhaust backpressure does not make a turbo freewheel.It will still only spin in conjuction with the exhaust drive pressure.

[RibbleConstruction]

Thats exactly what I was thinking and it makes me lose confidence in a shop makng such a claim.

[RibbleConstruction]

Ive been doing a lot of reading at dieselplace. Seems no one there Knows whether or not backpressure is a good thing or not. Seems to me that The less pressure would mean lower Egts and thats a good thing. Chris I though exactly what you said. Makes sense to me. And now that I have the truck back it seems that it has quicker spool up. I wished i would have payed better attention to this. I know one thing.... If i dont get a tranny soon none of this is gonna matter.

[John DiMartino]

The free flowing exhaust isn't whats going to hurt your turbo,its all that overfueling,high EGT, running nitrous and boost numbers that are beyond what it was built for.Then there is the motor oil,keep it clean and the turbo lives much longer than if you push the limits at every oil change.

[RibbleConstruction]

Correct me if Im wrong, but if I do somehow hurt this turbo. Wouldnt that just be good reason to upgrade to twins?

[ratlover]

most twins set ups use the factory charger ;)

Free spooling? WTF is that? :rolleyes: With or without exhuats your turbo will spin with the motor running. Wont bild boost or spin fast but it will spin.

Back pressure isnt good(most of the time you dont have "back pressure anyway but thats what people call it). Exhaust pressure isnt going to make a difference one way or the other.....high EGT's may hurt.....but "pressure" or lack of isnt going to hurt. Now odly enough it seems bigger exhaust has slowed my very low speed spooling.....but once she spools its fine.

[Earthscapes]

Jon, what doesn't your exhaust have that makes it unrestricted ? You remove the muffler or something ?

[RibbleConstruction]

I have a 4 inch straight pipe. No muffler or cat. It didnt have a cat on it from when i got it. . Then I removed the muffler. Then I decided I needed a 4 inch system. Then I decided I needed a new down pipe. And now we are here today no restriction.

[Earthscapes]

I think they only had cats on them from 05' to present.
I did the MBRP 4" exhaust, but ended up putting the MBRP muffler back in, cause it was to dang loud. It's still loud, but with a nice tone. Though my resi customers hate it :)
I've had the Hypertech on stage 3 for the last 20k and haven't pulled any codes even while pulling the trailer.
After 149,000 miles the tranny is still hanging in there.

Goodluck with yours.

[RibbleConstruction]

Ive got an open exhaust but with the resonator in the down pipe. Its loud but not too bad. I have the bullydog on crazy larry, a lift pump and custom intake. Its a nice qucik ride. I need to make it faster. Dont know whats next. The trans is shot. Got about 70k on it. Been a rough last few though.

[RibbleConstruction]

Phillip the tranny is gonna be done in about 3 weeks. After that you and Johny D are gonna have to fill me in on the twins. Thats coming next. But gotta sell a house first cuz Im gonna need some cash. And with two specs sitting. Money is kinda tight. :cash

[John DiMartino]

Phillip the tranny is gonna be done in about 3 weeks. After that you and Johny D are gonna have to fill me in on the twins. Thats coming next. But gotta sell a house first cuz Im gonna need some cash. And with two specs sitting. Money is kinda tight. :cash

Jon,get ready to drop a wad of cash,I see twins,dual Cp3's and a new engine w head studds,better rods/pistons in your future.:cash . I gotta admit,I love your attitude on things,let her rip,and sweep up the parts as they fall(trans).:D :D .

[ratlover]

You put turbos and dual cp3 and your going to blow your motor up eventually. Too much power and cylinder pressure.

I would street away from twin turbos personnaly.....but for you then may work OK since you tow quite a bit right? Twins would let you tow at higher power levels and not worry about EGT's. If you dont want to tow like a fool I wouldnt worry so much about them. I think twins for the Dmax will run you around 4500$....then you gota mount your battery in the bed or on the frame...move the coolant bottle as well.

Unless your a real nutbag if your using it as a work truck I would leave the stocker and spray the crap outa it if you real want to, or maybe go with a smaller single....and maybe still spray the crap outa it :haha

Get a trans and get her to around the 500RWHP mark and then re-evaluate if you want more. Right now with a shot trans and that crazy larry you aint getting crap to the ground.

I've tonned down in my old age though :D

[John DiMartino]

If you spray the crap out of it,your going to need an engine and head studds anyway.The spray is harder on the bottom end than twins will be.At least you have EGT control with twins.I told you what to do Jon,leave it reliable(too late now) and get an older 12V Dodge/Cummins for the pulls or track,and build a serious truck in the 1000hp range:D :D :popcorn2 .Use the Chevy to tow the Dodge to the track,so when parts scatter,you can winch it up on the trailer,and still go to work the next day with a truck that runs.

[ratlover]

If you spray the crap out of it,your going to need an engine and head studds anyway.The spray is harder on the bottom end than twins will be. I ment if he goes twin cp3 pumps. When people start putting them on motors is when we started lunching tons of blocks. Big turbo, tons of spray, no issues.....as soon as the fuel pumps when on we started hearing more failures. At least you have EGT control with twins.I told you what to do Jon,leave it reliable(too late now) and get an older 12V Dodge/Cummins for the pulls or track,and build a serious truck in the 1000hp range:D :D :popcorn2 .Use the Chevy to tow the Dodge to the track,so when parts scatter,you can winch it up on the trailer,and still go to work the next day with a truck that runs.This makes sense.....but is no fun :haha

I disagree that a heavy N2O truck needs studs. Duramax will chuck the rods 90% of the time before you have gasket issues. Hell.....even trucks that still run good with tons of spray have shortened the rods.

Twins are nice in the EGT control deal.....but the duramax handles high EGTs ok for short bursts.....and extra air is only needed if you want to tow with lotsa power. Towing with lotsa power is hard on stuff all the way around.

[RibbleConstruction]

Heres the deal. I drive this truck daily. And it is fun to play with. I do have a couple of other options should the dmax let me down. My wife has a ford with a v10. We also have an older gas chevy and a 96 big block ford. Someday John I hope to get to where I can have a toy and another nice truck. But for now they are one in the same. Besides. I can always use the wifes truck to tow me home. And should I scatter parts, It just gives me an excuse to go even bigger next time. While this is not the most reliable way to handle towing my trailers and making money during the week. It is Fun. I dont know what I can do to make more power without something big. I spose I could sell the bullydog stuff and buy Efi live or some other hotter programer. Other then that whats left thats not super expensive?

On a side note, and no offense meant, My wife made the comment to me the other day. She said ..." You should buy a ford, cuz you cant make those fast"
Shes hoping someday I will grow up. Even fords can be made fast..... I think.. well at least they look fast when they are shootin flames :wink

[RibbleConstruction]

What do you guys think about stacking? I have the chance to get a van aarken module, Says its a 220hp and its stackable. What would happen if i did that?

[ratlover]

stacking is hit and miss. Sometimes it works and sometimes it dont. It can be made to make good power.....but will never make the most. Its a bastadized way to do it. But if you are wanting to do it on a budget it may be an option.

EFI Live.....its not programing....its a tool. You will only get outa it what you put into it. And than means alot of dyno and track time tweaking it. Can be great fun though! It is nice if you have a pretty unique truck.....but you could have a good tuner tune your truck for ya to your set up. Everyone says its the way to make power.....sorry, it aint the only way to make power. For an LB7 I am still not convinced that anyone has out tuned Steve Cole. Even the guys with EFI live that are selling a program and have been tweaking and tuning on thier own truck havent proven IMO that thier tune they wrote on thier truck goes faster than Steves tune(on thier truck ;) )

[Staley52]

I just did a google on steve cole:rockon :burnout to find out what he is all about and all I can say is "we're not worthy we"re not worthy":notworthy :notworthy

[RibbleConstruction]

Phillip,
Thanks for the info. Got your number will call you tomorrow.
Jon

[ratlover]

Pretty sharp guy. TTS=Steve Cole

[RibbleConstruction]

Sorry philip had a busy day will try to call tomorrow. Any time better then another?

[ratlover]

When ever :)