Hi guys,

I'm looking for some help (answers) in my project car.

I have a daily use 5 speed 4wd vehicle equipped with an 2002 Holden Aluminum block stock LS1 Engine
(tuned OEM PCM) and would like to add a turbo to it

I'm going to order:

Lunati 395 LS1 8.5:1 4340 Forged Rotating Assembly:

Manufacturer: Lunati Cams and Cranks
Stroke (inches) : 4.125"
Rod Length (inches) : 6.125"
Bore Diameter : 3.903"
Compression Ratio : 8.5:1
Piston Dome/Dish Volume : -34cc Dish
Ring Sizes : 1.5mm, 1.5mm, 3mm
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My questions are :
I'm not sure if it's possible but my aim is a 850rwhp (1000HP) setup with a daily driving manner
and will use a 93 or 98 octen pump fuel (power range required from low to top rpm)

1- What is the max rwhp the above Lunati kit capable of handling (max PSI Boost)?
2- What is better a single or a twin turbo for high sand hill climbing and sand drag racing?
3- What turbo sizes are good?
4- What is the suitable cam specification of my project?
5- What are the best heads/intake/intercooler/injector size/fuel pump for my project?

the above ??? are what i need at the moment

Your help will be appreciated guys.

 

1- What is the max rwhp the above Lunati kit capable of handling (max PSI Boost)?

Although I have not done it myself, this rotating assembly should get what you are looking for.

2- What is better a single or a twin turbo for high sand hill climbing and sand drag racing?

I would say twin, if spool time will be critical.

3- What turbo sizes are good?

Anywhere from T60's too T70's, again although I have never done it myself some people claim the ballbearing turbos spool faster, but I question if they are worth the extra cash.

4- What is the suitable cam specification of my project?

Turbo cars do not need a radical cam, this depends on where you will spend most of your RPM, if you are going to be between 3000-6500 rpm the 2003 Z06 cam seems to be a good choice.

5- What are the best heads/intake/intercooler/injector size/fuel pump for my project?

AFR 205 seem to be a good head, remember as long as you can push cold air into the engine the heads can be compesated for - the AFR offer a thicker deck to prevent warping/lifting, I have not seen huge improvements in a turbo application going from a ls6 to a FAST intake, although I have heard of the #7 cylinder leaning out with a LS1/6 intake, the alternate is a carb intake with an elbow, this seems to work well (not because it flows more, but just because of the distribution problem). Go with the biggest intercooler you have room for. I would go with a 96lb injector to be safe. A good return system with a boost referenced Fuel Pressure Regulator and a set of Walbro 255HP have done this type of power, pretty inexpensive option, alot of serious guys choose to sump the tank and use an external pump.

If you want to do this on Pump Gas I would stay away from 93, go with the 98 and I would suggest a Meth System fo safety.

I have only built 4 turbo cars (one was an LS1) so I encourage you to get other opinions. Talk to Dr.Turbo for exact turbo for your application.

 

Thank u for your help bigturboz28

I'll keep you in progress with my project

at the momment you can see my car on the following link ( stock LS1 )

video

Thank you again

 

Damn, looks like alot of fun...

 

Looks like fun. I'd go twins.

 

Guys if you call that video FUN then you're missing a whole world of fun.

Check This video from a Hill Climbing championship ( Big Blocks ).

Fun

 

that does look like fun,

 

Let's get back to the subject:

Could some one refer me a link that sells a ready to fix (Bolt on) cylinder heads
that are suitable for my Engine setup (boost will be from 10 to 20+ PSI controlled by a boost controller)


Lunati 395 LS1 8.5:1 4340 Forged Rotating Assembly:

Manufacturer: Lunati Cams and Cranks
Stroke (inches) : 4.125"
Rod Length (inches) : 6.125"
Bore Diameter : 3.903"
Compression Ratio : 8.5:1
Piston Dome/Dish Volume : -34cc Dish
Ring Sizes : 1.5mm, 1.5mm, 3mm