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Max N/A power from Gen 3


This is a discussion on Max N/A power from Gen 3 within the Performance Mods forums, part of the Viper Truck SRT-10 Discussion category!
The real question is how long do you want it sitting in a shop waiting for parts You better have ...



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  #11 (permalink)  
Old 09-20-2015, 07:50 PM
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The real question is how long do you want it sitting in a shop waiting for parts




You better have your parts ready to go with an extra 15-20k in the bank for those...... "an you need a new....."

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Old 09-21-2015, 09:50 AM
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For a 6 speed, high 500's SAE on a dynojet without going nuts on everything and a cam that doesn't sacrifice bottom end torque. That would be full bolt on's and ported stock heads/intake and custom cam. Don't get too caught up in peak #'s as its easy to make a big number if you give away the bottom end (where a truck needs it most).
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Old 09-21-2015, 05:00 PM
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My Motor Was Built At A&C Performance , Fully Built , Best Parts , His Cam And Stage 3 Ported Stock Heads And Intake , And Best Pull Was 540 At The Wheels, He Say's Drive Train Loss Is About 20%, On The Trucks ,Vipers Less, He Did Say There Was More, But Left It At That .
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Old 09-21-2015, 05:13 PM
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without heads and the right combination we have made 525 to 560 rwhp all day long, with heads so far 600-630 hasn't been a problem,
but the right combination and compression have to be together, 20-30 can be as easy as a head gasket swap
sorry too busy to list all of ours
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Old 09-22-2015, 12:09 PM
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Quote:
Originally Posted by beastly1 View Post
My Motor Was Built At A&C Performance , Fully Built , Best Parts , His Cam And Stage 3 Ported Stock Heads And Intake , And Best Pull Was 540 At The Wheels, He Say's Drive Train Loss Is About 20%, On The Trucks ,Vipers Less, He Did Say There Was More, But Left It At That .
Your power number is completely realistic with the mods listed (ported heads, h.p. cam, etc.). I'm assuming pump gas is being used here and the pulls were on a Dynojet...

Autos typically do show a lower number than the manuals but if your automatic equipped engine build favours torque production over high r.p.m. horsepower (cam choice here is big), the difference in street performance between the 2 is negligible.

Way more fun producing the torque in the heavier trucks (and better mileage).

As long as your having fun.
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Last edited by rottenronnie; 09-22-2015 at 12:12 PM.
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Old 09-22-2015, 02:21 PM
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Quote:
Originally Posted by rottenronnie View Post
Your power number is completely realistic with the mods listed (ported heads, h.p. cam, etc.). I'm assuming pump gas is being used here and the pulls were on a Dynojet...

Autos typically do show a lower number than the manuals but if your automatic equipped engine build favours torque production over high r.p.m. horsepower (cam choice here is big), the difference in street performance between the 2 is negligible.

Way more fun producing the torque in the heavier trucks (and better mileage).

As long as your having fun.
I would assume the limiting factor in a build like this is the intake manifold?
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Old 09-22-2015, 02:25 PM
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Not much to gain porting a Gen III intake. Maybe 25 HP (Max) BUT there is a corresponding drop in TQ because the passages are now bigger and lose some velocity.
It depends what you want.
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2005 QC N.A.
624 Wheel HP x 1.27 = 800-'ish flywheel (?)
11:1 Pump-Gas
14.9L/100 km. or 15.8 U.S. Miles Per Gallon
5600 pounds
11.88@115 MPH in "D" for Drive

No Power Adders
Full B&B Exhaust WITH Cats
Unported Street-Striker Heads w Custom Roller
Unported O.E.M. Intake Manifold
FSTJACK Hand-Ported TB
MONSTER R/X Dual-Vacuum Catch-Can
A built 48RE transmission that actually keeps working!
Tuned by Maestro Chris Jensen
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Old 09-22-2015, 02:39 PM
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Quote:
Originally Posted by rottenronnie View Post
Not much to gain porting a Gen III intake. Maybe 25 HP (Max) BUT there is a corresponding drop in TQ because the passages are now bigger and lose some velocity.
It depends what you want.
so if ya want to keep the TQ up on a truck app. a good port match would be the best for a Gen III intake???
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Old 09-22-2015, 06:11 PM
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so if ya want to keep the TQ up on a truck app. a good port match would be the best for a Gen III intake???
You can zip cut the tops off and radius the port mouths (also porting downwards from there) but it can be a little bitchy welding them back on without warping. It is THE BEST and most complete way to port though.

Otherwise, gasket-match as far up the runners as you possibly can and finish with an extrude hone (optional).

The velocity will DROP right at the port exit if you simply gasket match the port only, say 1" into the port. Just when you WANT the air to be at a good velocity, it will drop when it hits the larger cross sectional area. That is bad. It is also a waste of time.

So, once again, port AS far up the runner as you can. Like productions heads, there is not a great deal of material to work with so proceed slowly. If you pierce a wall or floor, you can JB Weld or use a TIG welder. Grab an inside mic, grind and check, grind and check.

A hundred hours later you can marvel at your work.

Leave the surface rough. Don't polish or it creates extra drag.

Gen III porting 101
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2005 QC N.A.
624 Wheel HP x 1.27 = 800-'ish flywheel (?)
11:1 Pump-Gas
14.9L/100 km. or 15.8 U.S. Miles Per Gallon
5600 pounds
11.88@115 MPH in "D" for Drive

No Power Adders
Full B&B Exhaust WITH Cats
Unported Street-Striker Heads w Custom Roller
Unported O.E.M. Intake Manifold
FSTJACK Hand-Ported TB
MONSTER R/X Dual-Vacuum Catch-Can
A built 48RE transmission that actually keeps working!
Tuned by Maestro Chris Jensen

Last edited by rottenronnie; 09-22-2015 at 06:35 PM.
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Old 09-22-2015, 06:15 PM
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Someone check my bench-racer math: A port that flows 285cfm at 28", on a 505cid V10, should be good for 670+hp. Subtract 30hp for accessories (I made that number up, so any read data is welcome) and an additional 13% for RC SRT10-like drivetrain losses, and a stock Gen III head should support around 550rwhp, correct? Based on that, a fully ported Gen III head (330cfm @ 28") should be good for right around an additional 93rwhp.
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Last edited by caveman; 09-22-2015 at 06:18 PM.
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