Medium duty manifolds and high flow up pipes
- Thread starter JoshH
- Start date
Question for those who build them:
What diameter uppipe is appropriate for a stock turbo application (specifically LB7)? I've asked Rick about 1-7/8" (BTW, thanks for the quote Rick...its intriging), but the more I ask, the more eyes get rolling about that size, and the more times that 2" is recommended.
I'm just trying to figure a balance between flowrate and velocity, but know nothing of how to figure it all out. Dont want to put too large of pipes on the truck to have it actually hurt performance.
What diameter uppipe is appropriate for a stock turbo application (specifically LB7)? I've asked Rick about 1-7/8" (BTW, thanks for the quote Rick...its intriging), but the more I ask, the more eyes get rolling about that size, and the more times that 2" is recommended.
I'm just trying to figure a balance between flowrate and velocity, but know nothing of how to figure it all out. Dont want to put too large of pipes on the truck to have it actually hurt performance.
Last edited:
I belive thats the size 1 7/8, of the medium duty up pipes but not for sure. I measured them once, before I put the driverside on, but forgot what it was and my buddy has the other side so can't check. Does anyone know what size they are?
Last edited:
i was refering to Toms stock turbo truck have no clue whats best just what has been tried and whether it worked or not .
Last edited:
I was refering to the size of the medium duty stuff. I thought when I measured them and told Rick what they was he said it's the same as his basic pipes as far as size. Last time I heard Bucks truck was running medium duty manifolds and up pipes so I'd say 1 7/8 supports plenty of power. Question is if you go bigger how is drivablity and veloctiy going to be effected. Maybe not much at wot once it spooled up but I'd think it would take more time to spool on the line. Then again if no one trys it we won't ever know.
i can say that the 2" on my truck along with the header spool much better , but boost was lost , i'm at 50 psi now wich for me was a good thing, i have 2 theroy's .............. the firstb is it happend from drive pressure reduction ( less pressure on the other side of the valve ) the secound is reduction in volocity , the secound doesnt seem to fit because spooling is better so
.
Last edited:
i can say that the 2" on my truck along with the header spool much better , but boost was lost , i'm at 50 psi now wich for me was a good thing, i have 2 theroy's .............. the firstb is it happend from drive pressure reduction ( less pressure on the other side of the valve ) the secound is reduction in volocity , the secound doesnt seem to fit because spooling is better so
I think your truck is retarded strong as in it doesn't know it's own strength
Driver side works with some modding...passenger side will take some customizing to get it to fit as the down pipe is in the way.
I think your truck is retarded strong as in it doesn't know it's own strength
i dont know what you mean :angel:, Dmaxes have great head gaskets i dont even know why guys buy studs :coolspot::rofl:
BTW don't curse me Steve , mike already threatend Subman , i'll sik him on you next :rofl:
They will with a little modifications done to the fire wall, On a stock turbo application I dont believe you will see any real huge benefits for the work to put into it.
The factory up pipes also dont like to see heat, If your looking into it save the money and do up pipes with good quality bellows in the up pipes.
Has anyone done any comparisons with the BD manifold and passenger side stock manifold to a set of the medimum duty ones? I mean other than general impressions? i'm wondering if they really make that much of a difference, especially with a good set of twins?
I had both the stock and medium duty manifolds in my hands to compare and the medium duty on the inside is larger. At the opening of the port the stock manifold has a lip before the exhaust can turn and the medium duty dosen't have it so right at the opening its larger. Reason I went with it was I paid $230 to my door for both sides and it was alot cheaper than doing the bd manifold. The transition from the medium duty manifold to the up pipe on the driverside is alot better than the stock setup and has less bends. The bd manifold botls up to the stock up pipe so the transition like the stock manifold is still there. Dipper posted about the extra cast iron that curves around to the back of the motor should also help keep more heat in the exhaust for better velocity in another thread and the radius of the turn is a nice sweeping bend. Only thing it has done for me that I can tell is my egts don't climb as far and my logs show my turbo vains at the same mph with the same tune from last year are 10% more open and I would guess from more exhaust flow???
EDP...Did you guys get the passengerside to fit with the down pipe there. I should ask this have you put one on a lly/lbz/lmm with a dimaond eye down pipe or did you do it with aftermarket turbo and pipe?
Here are some pics just so the people that never seen them before knows what they look like. The ones of the up pipe are the passengerside with an egr but it's turned side ways to show the bend.
EDP...Did you guys get the passengerside to fit with the down pipe there. I should ask this have you put one on a lly/lbz/lmm with a dimaond eye down pipe or did you do it with aftermarket turbo and pipe?
Here are some pics just so the people that never seen them before knows what they look like. The ones of the up pipe are the passengerside with an egr but it's turned side ways to show the bend.
Last edited:
Same reason I went w/ 4500s - $140 shipped. Plus if Kusilek is running them on his truck (at least he was for a while I don't know what now), they gotta work ok I guess.
Last edited:
I talked to the same peep's awile ago when i was going to build myself a set, they were more than friendly, and willing to sell me some, but as you stated, bring your wallet!!
That's cool of you to pass the price break on
