I've been looking at a H/C/I setup for my '89, but it seems like the turbo would be more economical. Here's what I have so far:

Turbo
Magnum T-72 Ball Bearing $ 971.74

Hotside
SS304 LSX Head Flanges $ 89.98
1.5 Sch 10 SS304 Long Weld Els $ 39.60
1.5 Sch 10 SS304 Short Weld Els $ 70.00
2.5 Sch 10 SS304 Pipe $ 53.00
1.5 - 2.5 Sch 10 SS304 Reducer $ 66.96
SS304 T-4 Turbo Flange $ 25.00

Downpipe
3" V-band Connectors $ 58.00
3" SS304 Exhaust Pipe $ 99.00


Oil Feed
Braided Feed Line $ 60.00
AN Adapters $ 80.00

Intercooler
31x12x3 $ 122.04

Charge Pipes
3.00" Piping Kit $ 125.00

BOV
TiAL 50mm Q Series $ 260.00

Fuel Pump
Walbro 400LPH $ 160.00

Fuel Lines
Braided Fuel Line $ 40.00
AN Adapters $ 104.00

Fuel Injectors
Deka 80lbs/hr $ 390.00

MAP Sensor
GM 2-Bar MAP Sensor $ 55.00

Gauges
Speedhut 2-5/8 EGT $ 181.95
Speedhut 2-5/8 Boost $ 181.95
Speedhut 2-5/8 AFR $ 121.95
AEM Uego Wideband Controller $ 197.99
Autometer Gauge Pillar $ 68.99



Total $ 3,622.15

Is there anything major/obvious that I'm missing? I already have HP Tuners with the 2Bar Speed Density OS. So, the tune is covered. I may or may not upgrade to the Pro version to get the wideband info into the log files.

I think, with the above list, that the only thing left for me to supply is the welder and filler rod... ???

 

Ls1 346 cubes? Q trim magnum turbo?

Need a wastegate

 

Yeah...

I sent a request over to Magnum, and they came back with a 76. I thought that was little big for what I'm doing at the moment.

Would you advise a different route?

 

I would suggest looking into a 75+mm turbine wheel turbo IIRC those magnums are a 65mm turbine. A turbonetics 7875 would do the trick and lay down plenty of power. Any reason you are going ball bearing? Any of these turbo's will light up real fast as is.

At minimum get a 44mm gate, if a 50mm is in the budget go that route.

I would also step up to the ebay 31x12x4 intercooler. Pretty well the same price anyways.

If you go to racepartsoultions they have their one tial knockoff 50mm people wear by. I bought one. Looks to be a nice piece and comes with 2 springs. It was around 100. Its made by JODAR iirc.

Jay

 

What you trying to do with the setup? Stock internal ls1 should be reliable up to 500 whp. 72mm will do that but would need atleast the q trim 68mm turbine option and a big a/r housing.

75mm turbine would be abit betterfor less backpressure and would support 700whp+

If you arent tryingto go that high then 68mm should do. The ptrim 64 mm wheel is gonna have alittle higher backpressure but should produce 400-500 whp. I would go larger on downpipe after the exit. 3.5" exhaust

 

Also I should add. Maybe look into the innovate or AEM failsafe gauges. They both do BOOST and AFR, the innovate also is a boost controller and has a shift light. I just put one in my custom cluster. I just made a thread in the interior section but also have pics of it in my build "project deja vu" in this section.

Just a way to save some coin. I also bought some speed huts. but couldnt justify their boost gauge price.

Jay

 

180 for a boost gauge? I'll stick to my autometer mechanical 60$ one lol

 

I paid $16 for my sunpro mechanical boost gauge, works great!

I also only paid $120 for my AEM UEGO wb. And that is the whole package, gauge, controller and everything.

Should have went with a 2.5 bar map sensor at least.

 

On the gauges... I know I'm going to get hammered for this... but, I want full sweep electric gauges that match my 2000 cluster. Speedhut seems to make some pretty neat stuff, and I've been wanting to include them in a project for a while. I would like to see if they can match the font type on the 2000 cluster.

Basically, what I am trying to do is build up the turbo system around the existing LS1 mill, with room for growth later on. Swapping out a charger or long block is going to take a fraction of the time that the initial build will. But, if I can get all of the supporting fabrication done on the LS1, the next iterations should just be component swapping and tuning, correct?

Before I go too nuts, I need to figure out the clutch, trans, and drive shaft anyway.

Then there are two divergent paths; cheap 4.8's or 5.3's and push 'em til they pop, or LSX and build it to be indestructible beyond 1,000 HP.

I thought a stock LS1 would hold together for more than 500 RWHP though...

 

They can i guess, its in the tune. Theres a few making more, a few ls6 guys makin 700-900 hp on stock bottoms.

500 is just a good safe number and good for that turbo. Can likely do more if you swap to 317 heads and drop that compression abit.

If you want more to grow into, get the t76 with 75mm turbine they sell. And i been hearing good things on the vsracing 7875 turbo. It will do upwards of 700whp+ on 6.0's. And its only 400$

 

The only problem with the China turbos is there is no upgrade path at the moment with the tiny turbines they put on them. What is the exhaust backpressure at 700whp with a 3.0" turbine outlet? Seems like valves won't last long with that setup and is detonation sensitive. For a low buck 500HP build then the 7875 seems fine.

I see a 400lph fuel pump in the list. I would increase the fuel line price because both the feed and return need an upgrade. Install a 4" thick intercooler. I would run flipped and cut/weld LSx headers before making that S/S log manifold.

 

Even the guys selling them know the compressor / turbine is a mismatch.


Here is the discussion about the same family turbos:

http://www.theturboforums.com/thread...nd-88mm-turbos

"pretty much the 88mm can only go so far wih the limited turbine wheel.

the s475 can only flow so much as the compressor so in tother words its pretty much a toss up on those two. they flow pretty identical. the s480 is 125lbs /min or so and its pretty strong beast compared to the s475 at about 105lbs or so the 88mm is right at 108lbs min "

Overall, the china 88mm can only flow what the BW S475 can out of the box. The S475 compressor can be upgraded to flow 1400 lb/min.

 

75/82 isnt that tiny, a long way from the old 64/74 and 68/74 p and q trims most have.

The 3" vband out isnt a huge deal as you can neck up the exhaust pipe with a cone transition.

I havent seen valve failures with higher back pressure systems. Run a good spring and valve it will live. Agree not optimal but not a terrible route to go for the $$ and fairly compact size. T6 sucks to fit but agree the 83/96 turbine is better for the bigger power numbers
I just wouldnt want to push the ls1 over 500-600 whp. Truck 5.3 yes i would go 700-800

 

Yeah, the 7875 isn't too bad. About at the limits, but to go larger means T6 frame so ya might as well design for it. Love them 5.3 liters.

 

I went with the good old China GT45 on this build more or less to get the car out. But also designed it to fit around this specific turbo so that I can swap it for a T4 S475 in the future if I want. But knowing me I will build another turbo setup next winter lol

But the China GT45 is another contender to add to the list if you are looking for 500-600whp. Its been known to be very reliable and has a 77mm turbine with a 1.05a/r housing. nice thing is like I said, if you build around it you should be able to fit a T4 S400 in the future.

I used flipped manifolds and only have many $200 wrapped up in my hotside. 14awg 2.250" Mild steel, 1 Flex pipe and 3 V-bands and a Divided flange I built at work. My setup was built for a true twin scroll.

Jay

 

Vs racing sells gt45's with 76 mm comp wheels now. Should make good power