ditched the twins, went super phat!

[JWestley]

500+ is doable with your HX-40 but there are a few things that need to be done to it so it will live for a while. 600+ is no big deal with the 66 or Silver Bullet as I see it.



Jim

Yea, i have no doubt that there is still some power left in the turbo, just looking for a turbo with a tad less lag. Plus more boost is always a plus, i can only get 40psi with the HX40

 

[Reb.B]

just a quick hint, ..... the more solenoids you use, the safer it is the the more power it is. Its a win-win combo. It is more expensive though. i would go smaller with your first jet though, ... closer to a 45-50 jet. The smaller the first jet the sooner you can use the NOS.

 

[Cooker]

Plus more boost is always a plus, i can only get 40psi with the HX40

More boost is not always a plus.

 

[Forrest Nearing]

More boost is not always a plus.

it is when it's efficient



he's got my old truck... with the wastegate blocked, I would see 45psi... I had it set at about 38-39... EGT's didn't climb any faster than with it higher, so I left it like that. that was with 370's and a #0 plate...



my truck now currently has stock 215 injectors and a home ground plate... I'm waiting for a couple more retorques on the head before I put the DDP4's back in it, but even w/ the stock injectors, I'm seeing 45psi if I'm not careful. EGT's won't go over 1200* (I'm figuring the DDP4's will cure that )



his truck w/ an sps66 and 47-48psi of nice efficient boost would rock the house!!!!

 

[Cooker]

it is when it's efficient

Agreed. Most people do not understand this though. Also I think most people are over estimating the efficiency of some of these newer chargers.

 

[Jim Fulmer]

just a quick hint, ..... the more solenoids you use, the safer it is the the more power it is. Its a win-win combo. It is more expensive though. i would go smaller with your first jet though, ... closer to a 45-50 jet. The smaller the first jet the sooner you can use the NOS.

Sounds like a winner to me! Yea as it is setup right now is a little to much for stage 1 as both will be on a controller.



Jim

 

[Tomeygun]

oh my, ... ... ... ..... hold on while i pick myself up from falling off of my chair. ... ... ... ... ... ... ... ... ... ... okay, i'm back. I never , ever thought i'd see a forumn about pulling twins and going with singles. Jim, just wait till you figure how to make that single light, ... so much better. Large single, with multistage NOS is the way to go. I finally got my truck with zero turbo lag. Singles are much more reliable, easier to work on, less heat in the cab, less fire danger, just the way to go.

Any certain brand?

 

[Reb.B]

well after much research, i have found NOS brand to be the easiest, and most reasonable on parts and jets. It needs to be custom built to really work well. And, ... . i try to stay away from controllers. When its setup right, it will work better than any controller. The controllers on the market lean towards the gas engines. Companies such as Bullydog are building kits and working with NX to make controllers work on our trucks, but i still say a manual kit with boost switches is the way to go.

 

[zstroken]

Druggies!!

 

[Diesel Freak]

it was a PDR 35-12 on top with an S400 on bottom. it was built with Rip's twins components, and it was top notch, don't get me wrong... I could get 20psi by 1700rpm in 6th, but if I was showing no boost on the gauge, it took forever to get that 20 and more to come in...



now if I'm crusing at 2000rpm and just lay into it, I'd say I see 30psi in half the time or less than I would with the twins...



in a towing situation w/ steady load on the engine, the twins are awesome



and perhaps a "bigger" set of twins would have hit harder, I don't know, but at this point I have no desire to find out... I feel like I've got a great combo, it's super-drivable, makes great power, and if I want/need more, I'll just hit it w/ some drugs

hmm that is odd.



I have ridden in a couple trucks with the S400 as a primary. It works well... . if you have the fuel for it



However you bring up the exact reason why there is not a S400 on my truck. The 1. 32 A/R housing and big fat turbine on the S400 do make it spool kinda slow.



With my twins, I can lift the Big Wastgate on the primary in 3rd gear by 2000 RPM!!!!!



gotta love it... fully spooled to 20 PSI on the big charger!!



Yes, it is a Garrett GT42-02 with a 1. 01 A/R T-4 housing!!!

 

[zstroken]

What is your small charger?

 

[Diesel Freak]

a slightly modified HX40 (externally gated)

 

[Bandit1]

have a phat, getting ready to ditch it and go to twins. with the fuel i have now this 66 just simply will not support it safely. i can have about a 3-4 second run and my pyro is peg, to me that is not useable power and there is no way i would ever put N2o on my truck. that is just more fuel to buy and worry about keeping filled, to each his own though, honestly. i am not going to go hog wild on the twins, just something to supply enough air so i can use the fuel i have and be able to play with it longer safely.

 

[Jim Fulmer]

If you want to jump to Twins the 66 is a good top turbo too... ... . as you know I ran a 66/BB combo for along time. A little bit better spool as a single but not allot of difference.



Jim

 

[jwilliams3]

What is your small charger?

Dan,

Are you thinking of going twins so you can compete with the 2. 8 guys? :-laf

 

[zstroken]

No i figure I need twins on a common rail to compete with the 12V guys

 

[jwilliams3]

Going up to superstreet? It dont take twins... just takes r's.

 

[Forrest Nearing]

have a phat, getting ready to ditch it and go to twins. with the fuel i have now this 66 just simply will not support it safely. i can have about a 3-4 second run and my pyro is peg, to me that is not useable power and there is no way i would ever put N2o on my truck. that is just more fuel to buy and worry about keeping filled, to each his own though, honestly. i am not going to go hog wild on the twins, just something to supply enough air so i can use the fuel i have and be able to play with it longer safely.

if I had an auto, I'd probably stick w/ twins

 

[Diesel Freak]

With my twins, I can lift the Big Wastgate on the primary in 3rd gear by 2000 RPM!!!!!



gotta love it... fully spooled to 20 PSI on the big charger!!



Yes, it is a Garrett GT42-02 with a 1. 01 A/R T-4 housing!!!

I have to recant this statement.



I went out and tested it yeaterday, 20 psi on the primary does not occur till 2500 RPM in 3rd gear.

 

[Forrest Nearing]

got some more numbers on this setup:



I was coming south on 45 and a 7. 3 Excursion was hazing everyone w/ smoke (bet that thing was HOT... stock exhaust, stock air box, no gauges, holding it at WOT hazing for long distances)



finally got a hole in traffic where I could shut him down



during that run, I learned that II sets the wastegate on these things at 48psi or at least mine is!



with my twins, I could see 20psi on the gauge in direct or OD at about 1550-1600rpm with minimal smoke.



with this setup I can put 20psi on the gauge at about 1675-1700! these are 5th and 6th gear numbers... minimal smoke



with the twins, I would get 40psi at about 2000, 45psi at about 2300-2400, and 50psi at about 2500. this is w/ DDP4's



with this setup, I don't even know where I get 40psi, because I have 45psi right at if not before 2000rpm... creeps to 48 at about 2400 or so. this is w/ 215 injectors and thick washers!!!! will these numbers get better when the DDP4's go in?



I never really watched the 10psi numbers because it was pretty much always there w/ the twins no matter what, and it comes on pretty early w/ this turbo... I'm guessing 1300-1400 or so? I don't really lug it like that.



so the long and short of it is boost comes in maybe 100rpm later, but I'm seeing 45psi almost 400rpm sooner! and it may get better when the DDP4's go in.



words can not describe how much quicker boost comes in if I'm just cruising along at 2000rpm w/ 5-10psi showing on the gauge... w/ the twins it took a year and a day for the boost to come in... w/ the 62, it's NOW.



when the DDP4's go in, I'm going to be installing a drive pressure gauge (manifold is tapped, and there's a dead hole in my pillar that used to be for the bottom turbo) I want to make sure the port work isn't increasing the mass:boost ratio so much to overspin the turbo. (not from a standpoint of damage to the turbo, but from an efficiency map standpoint) I figure as long as drive pressure is in check, it should be alright.