NuckenFuts

I have 1500 miles on my rebuilt LQ4 and thought mud drags was a good idea till I took sand/water into the intake and oil sample came back bad. So I tore the motor down and have spent the last week planing on stroking it to a 409.

After thinking that 505 RWHP was awesome with this new stroker plan I seen a Sig of a member that is running stock 5.3 with a turbo pushing over 650 HP and kind of made me think twice of my plans.

The guy that does all my machine work has this awesome 37 Chevy truck running LSX with twin 87MM turbos and started asking him about turbo build. His buddy is selling his set up and this is what it is.

Used for $1000
78MM Turbonetics Turbo (78MM compressor /68MM Exhaust)
Wastegate - Turbonetics RG-45
Blow off valve.


I just ordered a set of -15CC Diamond pistons to run between 9.1-9.5 depending on how much I want to mill my heads.

The build as it sits now
2001 Silverado 1500 4x4
LQ4 - .031 over
Lunati Voodoo H-Beam 6.125
Diamond -15CC dish pistons
Stock crank
Ls3 heads
EPS cam or TickCam (waiting for geoff to call me back on size)(Martin 223/227 114+5 .617/.598)
BTR dual spring kit
L92 intake ported
102MM TB
50# injectors
rebuilt 4l80E
3600 Stall
5.13 SF Truetrack

Again I kind of got thrown into this in the last 14 hours and plans changed so Ill be reading as much as I can and will be following this build found here on making my own pipes. http://www.performancetrucks.net/forums/projects-gallery-189/budget-built-turbo-silverado-$1600-complete-build-inside-531823/

If you guy see any major problems feel free to tell me as this is my first turbo. I do need to figure out my fuel system as Im 100% sure a stock pump will not feed this. My injectors are even in question now as 100% duty shows max 800 HP.

Calypso

iTrader: (1)

I'd double the size of the injectors, at least. You planning to run E85 or pump?

NuckenFuts

As of right now its going to be run on 93 and depending on where it goes will upgrade injectors. I can also look into E85 if there is a benefit to run more boost or have the engine run cooler.

I dont need to max this out but have it make over 750HP would be awesome. I still dont know what all needs to be done as my journey for turbo has just started.

wolfinsheepsclothing

iTrader: (1)

I agree; larger injectors would certainly help future proof yourself. I love tuning on E85

VegasZ

If you haven't bought that turbo yet, I'd look at something bigger. A 68mm turbine is less than ideal with a 6.0.

NuckenFuts

He had them spec that one for his LQ4 hmmm

I pick it up friday so I dont have it yet but seemed like a good deal for $1000.

NuckenFuts

Can anyone suggest a better turbo for my set up? I called a few places and was told a 75/87 would be abetter set up.

JoeNova

Borg Warner s475 with 83mm turbine is $650 new from forced inductions. The 96mm is the same price but the 83 will spool faster and make a ton of power still. The 87 and 92mm turbines are more expensive.

NuckenFuts

Yeah thats who I called and they wanted $1149 for one he said I needed. .... Ill call and talk to Jose again. Thanks for the help and Still trying to take all this in LOL

NuckenFuts

Ok I passed on the TC78 as was told it was to small more then once. So turbo build is still on and just need to find a turbo now. Diamond pistons and new cam on their way so no turning back.

Any suggestions on what turbo for 370 build in a truck?

JoeNova

Yeah... like I said before, the BW S475.
There are a couple of guys on here that have ran 8's in the quarter mile with them. The 96mm turbine one is rated for 1000 or so HP. For the price, its almost a no-brainer.

NuckenFuts

Looks like that is the best option for the price. Think it will be a good turbo to start off with. Thanks for the help.

Sales@Tick

iTrader: (3)

BW S475 gets my vote as well. T6 flange, 1.32 housing, 96mm turbine wheel with that cam will be at full boogie by 3500-4000rpm at the absolute latest.

NuckenFuts

thanks for the help, I was sold on the 475 until I see alot of guys running the S480. Cost difference is about $300 between them and think for my HP goals in a truck the S475 will most likely meet them.

Martin I talked to Jose yesterday and was asking about his billet wheels and was curious if you think I need that for my application. This is a DD truck and will only be raced around town and have been told to leave cast and or get the billet. The guy helping build this uses all precision turbos on his trucks and the one thing he told me was to get a billet wheel on what ever turbo I get.


Also 9.1 CR or 9.5? New pistons with stock gasket and heads puts me right at 9.1, can mill heads to bring up.

NuckenFuts

Its like X-mas morning here today

JoeNova

You won't really need the billet. It'll make your s475 perform similar to the s480. For the price of the billet s475 you could get the 80mm. There are slight tradeoffs.

The cast wheel s475 is a major bang for the buck. Spending extra money on a billet wheel for an extra 75-100 peak HP potential isn't needed in your case.

Sales@Tick

iTrader: (3)

IMO you don't need a billet wheel to do what you're after. With a good cam like I recommended that is not too big nor too small you'll be right where you want to be.
Agreed 100%. Billet wheel will add power outside of peak power, but it really depends on where on the compressor map you end up as the engine moves throughout its operating range.

NuckenFuts

Ok im sold on the S475, Can get one brand new for $640 shipped to my door. Martin I dont know if you sell them but PM me a price if you want.

Sales@Tick

iTrader: (3)

I can sell you a S475 with a T6 flange, 1.32 housing and a 96mm turbine wheel for 650 dollars.

NuckenFuts

Ill take it, Ill call you here in a bit to get it going.