Viper inatke manifold results!

[a853rox]

I've recently had the pleasure to work with a very reputable viper shop in California called DC Performance. Lyle, the owner, has been around the industry for many years and has an impressive rap sheet with time spent working in development with Edelbrock, winning NHRA events such as Gator Nationals, not to mention his shop has one of the fastest drag vipers around.

We teamed up on a project vehicle, one of their customer's SRT-10 Viper Ram trucks, to see what gains could be had by performing the FFP touch on the intake manifold (viper genIII). The manifold came out beautifully and I was expecting the manifold to yield ~30-40whp from the work, at least by my math and previous experience with NA manifolds.

On the dyno though, we only walked away with ~10whp/15wtq and it left me scratching my head. It just didn't make sense. After that initial run, they also installed a divider into the plenum (that I also developed) and saw no gains above the previous test. Now I was really confused as was Lyle.

So the owner takes it to the track, with no other changes, and nets +2.674mph better in his trap speed and ET down by .142sec. Keep in mind this is a full street trim truck weighing in at ~5500lbs.

From Lyle's Motec training at Edelbrock, he stated that for each 1mph gain in the trap you should bet getting +12whp. This means that the actual hp gains, in a real world environment, is actually 32.09whp! FFP work pays off once again! Good stuff!

Oh and here are a few other online calculators that validate these claims:

From ET Calculator
vehicle weight of 5500lbs, 1/4 mi trap of 110.55 and rear hp is 579.95
vehicle weight of 5500lbs, 1/4 mi trap of 113.224 and rear hp is 623.06

gain of 43.11whp

from Simple Horsepower Calculator
Vehicle weight at 5500lbs, 1/4mi et of 12.496, and 1/4 trap of 110.55 we get:
Using the ET method, I come up with 557 horsepower
Using the Speed method, I come up with 580 horsepower
Vehicle weight at 5500lbs, 1/4mi et of 12.354, and 1/4 trap of 113.224 we get:
Using the ET method, I come up with 577 horsepower
Using the Speed method, I come up with 623 horsepower

gains of et method: 20hp
gains of speed method: 43hp

from Horsepower Calculator from 1/4 mile ET and Trap Speed - DragTimes.com
1/4 et of 12.496, trap of 110.55, and weight of 5500 we get 568.53 flywheel hp
1/4 et of 12.354, trap of 113.224, and weight of 5500 we get 599.80 flywheel hp

gain of 31.27hp

and a few pics of the manifold:



Once again FFP FTW!

[DDogsrt461BLK 3.0]

Very Nice

[Philth]

Always have been impressed with your port work Bob. Good job.

[a853rox]

Quote: Originally Posted by Philth

Always have been impressed with your port work Bob. Good job.

Thanks man! There definately is more to it than just grinding away like most think, but when you get FFP porting under your hood, you can definately tell the difference!

[senk04SRT]

That manifold looks pretty tits. If i end up getting the viper truck I may ask you to hook me up with that beast. cost?

[a853rox]

Quote: Originally Posted by senk04SRT

That manifold looks pretty tits. If i end up getting the viper truck I may ask you to hook me up with that beast. cost?

It is a great mod to do for any cast manifold that's for sure!

I just did another one for a viper SRT-10 (car not the truck this time) and we got 18whp with essentially the same manifold. I'm not sure what the difference in design is between the viper car and viper truck, but apparently this portwork is good to both

If you do go the viper route just let me know and I can take care of you. Expect cost for a ported, ceramic coated manifold, with the center plenum divider to be ~$1000-1200 shipped. Let me know if you have any Q's from there.

[senk04SRT]

pm sent!

[a853rox]

Quote: Originally Posted by senk04SRT

pm sent!

And replied to as well!


Oh and we tried another manifold out on a Viper SRT-10 (car not the Ram) and we managed +18whp on that setup. I do still expect more from a boosted application but we still have yet to have someone step up for that.