Advice on Compounds

[Tobin]

Trying to figure out what the best route for a set of compounds for my project truck. I haven't done much in the way of sizing turbos so I figured I would ask the experts for help.

Engine is a 12 valve with a 180 pump built by Seth. Pump specs are below. Injectors are 5x0.014". 47RH auto with probably going to be a 5.38 gear with 40" tires. Looking to make 600-650hp. Want the truck to be able to tow and drive good on the street.

Right now I am thinking a stock HE351CW off a CR motor and a S475. Not sure on what exhaust housing. What are some recommendation? Trying to not go super crazy money wise with the turbos.


Pump info:
181 dv's
stock dv holders
100 plate
modified afc (45 psi boost for full rack travel)
5000 rpm kit
pinned at 20* btdc

max- 380cc
4- 310cc
3- 280cc (set)
2- 250cc
1- 220cc

0 psi boost- 110cc (afc full forward +1 turn preboost)
30 psi boost- 280cc


Tobin

[chevota84]

650 will be pushing a 351 pretty hard.

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[Tobin]

Originally Posted by chevota84

650 will be pushing a 351 pretty hard.

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That is what I was afraid of. What would a better choice be?

Tobin

[not enoughsmoke]

a 62/68/.91 would be a better choice

[DDually]

Am I the only one that think the 280cc of fuel wont get him to the 600 mark? In my opinion he is going to push that fueling to the max to get 550. MAX. Maybe I am being a pessimist. You are going to need the max amount of fuel that your specific 180 can push to make your 600-650. Your flow numbers seem low too. I just had a customers 175 pump push out 460cc max (Seths) which makes 600 more feasible to me. We are running a 64SXE and 5x.012s and we are hoping to be right around 575 at the tire.

[Tobin]

Originally Posted by DDually

Am I the only one that think the 280cc of fuel wont get him to the 600 mark? In my opinion he is going to push that fueling to the max to get 550. MAX. Maybe I am being a pessimist. You are going to need the max amount of fuel that your specific 180 can push to make your 600-650. Your flow numbers seem low too. I just had a customers 175 pump push out 460cc max (Seths) which makes 600 more feasible to me. We are running a 64SXE and 5x.012s and we are hoping to be right around 575 at the tire.

So I need some more fuel then. Wonder why the numbers are low...It's all new so I will run it for now but I am going to want more fuel in the future.

Tobin

[jlbayes]

Numbers look right imo for the 181 dvs and it being a 180 pump.

I like not enoughsmokes suggestion other than the exhaust housing. I'd prefer a gated 12cm housing. 75/87/ 1.10 t6 for the primary.

[not enoughsmoke]

Originally Posted by jlbayes

I like not enoughsmokes suggestion other than the exhaust housing. I'd prefer a gated 12cm housing. 75/87/ 1.10 t6 for the primary.

I was referring to t4 manifold and t4 .91
gated housing always give problems

[stubz616]

Originally Posted by DDually

Am I the only one that think the 280cc of fuel wont get him to the 600 mark? In my opinion he is going to push that fueling to the max to get 550. MAX. Maybe I am being a pessimist. You are going to need the max amount of fuel that your specific 180 can push to make your 600-650. Your flow numbers seem low too. I just had a customers 175 pump push out 460cc max (Seths) which makes 600 more feasible to me. We are running a 64SXE and 5x.012s and we are hoping to be right around 575 at the tire.

A good rule of thumb is 2hp per cc of fuel.


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[chevota84]

What are you going to use it for? If it's going to be a towing/working setup you might consider shortening your hp goal and running the 351.

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[jlbayes]

Originally Posted by not enoughsmoke

I was referring to t4 manifold and t4 .91
gated housing always give problems

I know, I have a similar hot side setup as you suggested and I am not a huge fan.

[DDually]

Originally Posted by stubz616

A good rule of thumb is 2hp per cc of fuel.


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Ya I know thats what I am saying. 280x2 is not 600. Also I thought the 2hp per CC was perfect conditions max hp? Did I misunderstand that? I dont doubt that his max fuel setting will get there but not where its set now.

[chevota84]

Originally Posted by DDually

Ya I know thats what I am saying. 280x2 is not 600. Also I thought the 2hp per CC was perfect conditions max hp? Did I misunderstand that? I dont doubt that his max fuel setting will get there but not where its set now.

He said it'll max at 380, 280 is just where it's at now.

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[Tobin]

Originally Posted by chevota84

What are you going to use it for? If it's going to be a towing/working setup you might consider shortening your hp goal and running the 351.

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Yes, mostly towing/working/daily driving. I know you can't have everything, i would rather have something more geared for daily work/street use. I can lower the goal, just hoping 500hp at the minimum.

Tobin

[Big Blue24]

With a ported wastegate, I see no issues with 650 HP on an He351cw based compound turbo setup.

Both my daily driver and my Junker Drag Truck have surpassed the 650 HP mark with HE351cw based compound turbo setups. My race truck responded well to the bigger HX40 turbine I added to the HE351 once it surpassed the 750 HP mark, but it still was reliable and incredibly responsive and powerful with the stock turbine when the truck was in the low 700 HP range.

[Tobin]

Originally Posted by Big Blue24

With a ported wastegate, I see no issues with 650 HP on an He351cw based compound turbo setup.

Both my daily driver and my Junker Drag Truck have surpassed the 650 HP mark with HE351cw based compound turbo setups. My race truck responded well to the bigger HX40 turbine I added to the HE351 once it surpassed the 750 HP mark, but it still was reliable and incredibly responsive and powerful with the stock turbine when the truck was in the low 700 HP range.

What big size turbo were you running? Has anyone run a external wastegate in parallel with the internal or just blocked off the internal gate and run a external?

Tobi

[jasonc]

He told you an easy way of just opening the stock wastegate was proven reliable and made good power. Why go thrue the hassle of an external gate for what your after.

[Tobin]

Originally Posted by jasonc

He told you an easy way of just opening the stock wastegate was proven reliable and made good power. Why go thrue the hassle of an external gate for what your after.

Easy there killer, just asking some questions, and would possibly build the setup for a different turbo in the future with no internal gate.

Tobin

[chevota84]

Originally Posted by Big Blue24

With a ported wastegate, I see no issues with 650 HP on an He351cw based compound turbo setup.

Both my daily driver and my Junker Drag Truck have surpassed the 650 HP mark with HE351cw based compound turbo setups. My race truck responded well to the bigger HX40 turbine I added to the HE351 once it surpassed the 750 HP mark, but it still was reliable and incredibly responsive and powerful with the stock turbine when the truck was in the low 700 HP range.

How is your drive pressure in the 650 range?

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[Big Blue24]

Drive pressure is extremely RPM dependant, at peak power and plus or minus 500 rpm of peak power, driVE pressure was great, at 4000 rpm drive pressure was fairly high but the combo didn't make power up there so who cares. On the Junker with the bigger atmosphere charger, it ran best with the wastegate wide open from 40 psi total boost on up.