GDP Intake Horn Tested!
 

OK folks, finally got a GDP test completed. JP volunteered his truck and the results were pretty solid. The full article is available on our site (FINALLY back up) at : http://trivalleyperformance.com/inde...d=19&Itemid=51

The short of it is that it makes almost as much as the CFM+, is not plastic, has brackets for the GDP filter kits or for custom nitrous solenoid brackets, etc, and comes in cool colors. All for less than the other intake horns on the market.[guitar]

sweet ... thanks for the results Erik!!! very much appreciated!

Thanx so much for doing this & sharing the info!

THANKS ALOT ERIK. now i have to spend more money! dang it! LOL

My pleasure! I think the folks from BD are sending one down for me to test on my truck, so we should soon be able to add that one to the pile.

Please feel free to suggest other products to test, we'll keep doing them as we have time!

I also have a GDP intake on the way for flow testing :cool:
Between flow #s and dynos we get to see the big picture.

Bob

Erik,

You need another tester at 5000ft base altitude let me know!! LOL

Excellent!!

MikeyB

Am I reading that graph correctly? The green lines are the new hp and torque with the GDP intake? The intake smoothed out those huge dips in hp and torque?

Andy

Haha, well the dyno is a little tough to travel with!

ahh, that dip was a slip on the throttle from JP, NOT a prob with the stock manifold. The Green is the new graph.

oh, got that cured, there is one in town! lol... [coffee]

Then how can your comparison be valid? You claim 136 lb-ft more at 2000rpm. Is that the fuzzy math I hear about from Washington all the time?

Andy

Easy, the dip was pretty much over by 2000rpm, you can draw a line to approximate the power curve without the dip. Even discounting the dip, the power gains elsewhere were consistent. Boost when the run started was the same for both runs and they finished approximately the same also (44ish psi)

it would have been 70/190 if we counted the dip!

Yep I had this item on my "to order" list!!!!

I have to cry foul here! If the graph were trended out to cover the slip off the throttle you might see a increase of 20 lb-ft max, not 136 lb-ft like you posted.

I suggest you change your numbers or pull it down and retest.

Andy

I added another graph on the website of a run I chose not to use. Note the dip isnt there. I didnt use this one because it showed an unrealistic gain. Turns out the boost pressure was lower when the run started so it didnt peak like it did in the run we chose for running the final numbers. I chose the two "closest" runs.

if that still doesnt work for you, put your hand over the graph below 2000. Still works from there on.

Would your gains be cut in half of you replace the manifold (with a GDP) and don't replace the heater grid with a grid delete??

no, I doubt it, the grid delete is only good for a few, the manifolds are making the largest difference.

I have an idea! Realsquash, go buy all of the manifolds tested, rent a dyno for a couple of hours, and tell us how they perform on your truck. [coffee]

Hopefully my foot doesn't slip off the throttle and into my mouth. :rolleyes:

Andy

Well it looks to me also if you make that line smooth without the dip that it would be about 30hp at 2000rpms.

Realsquash-I think it just did.


But really-

Neither I nor Erik are trying to hype up the manifold. It made a little peak power, a decent improvement in midrange power, and it looks good. period. I paid full price for the manifold from Rich, and was going to post results even if it lost power on the dyno. The graphs were presented with an explanation as to any abnormalities, and compared to stock, same truck, same day, etc. I wish I could have had a dyno graph for every part I've ever purchased for my truck! Keep in mind that there are so many variables to consider when dynoing a vehicle, that the results have to be taken for what they are. You can interpret the graph however you want, and um sorry you aren't happy with the testing methods or interpretations.

J.P.

Does the CFM or GDP come with the 2 new gaskets for the heater delete?

Thanx.

mine came with 2 gaskets.

If the manifold really smoothed out that dip under 2000 rpm, that is truly a great thing, but what I'm reading here casts doubt on that. I've seen that dip in many a chart, but now I read that someone's foot slipped off the throttle during a run, and then that there were 3 runs, one that shows even more confusing results. Of course the run where the foot slipped also shows the best gains, and it would seem to me that the dyno operator would make another run if his foot slipped off. Something doesn't add up!

Andy

Those ones winspeed has looks cool.
The rubber coated metal.

If we cut irregularities, the manifold averaged 20-25HP and 45-65tq from 1800-2300. They are pretty close from 2300-3000, then the gains are 13-20hp and 25-32tq.

CFM comes with two gaskets.

Both come with gaskets. Cool.
Thanx.

Hey Erik, are you comparing the CFM & Glacier on that?

Thanx.

My foot never slipped off the pedal. I think the dips may be from when Erik was applying the load. just a guess.

Umm, no. The lower HP run (without the large dip) made the GDP look even better. We didnt use that run because it wasnt close to numbers that JP had run here in the past.

We are only doing tests like this to see what really works on trucks with the mods that so many of us have. There is no ulterior motive. If it doesnt work, I dont want to carry it. If I sell a bunch of manifolds, that is cool, but I doubt I'll ever see as much margin from these sales to cover the time and effort involved in doing these tests. Nor will it make a dent in the $60k invested in the dyno equipment.

So what exactly would my motivation be to mislead anyone?

That could have been it too. I am ignoring it since the rest of the run is consistent and the boost levels were consistent run to run.

Nope, those tests were done on different trucks. The #'s I was referring to were the GDPs gains over the stock setup.

Thanx for answering my stupid question.