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.08 sec increase in 1/4 mile!


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I can not take credit for this mod. It has been done before, but I have real numbers to back it up. The testing was done with a G-tech, averaging 4 bi-directional runs. I now have a sub 15 second SS with a cap on the back. The only other mod is a Westers tune.

 

Average times: 0-60 6.45, 1/4 mile speed 93.5, 14.93 seconds at 50 deg f, 100% humidity, wet surface, 560' above sea level, 3007"hg altimeter.

 

After messing around with different intake configurations, (stock and aftermarket) I finally came up with one that works.

 

Remove the plate under the stock air box.

 

Cut a 6" hole in the bottom of the box

 

Run a piece of hose from this hole to the right "brake cooler scoop". (I used Scat tube from the aviation industry. It will not cave in under mild suction)

 

This is the only intake mod I have ever done that acutally gave me a real increase in performance. Mileage figures will be posted after I get a good hold on them.

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When I I had my Evolution I ran into this same problem. Aftermarket Intakes would actually make the car less powerful, in the K&N case I lost 26hp. You would think on a turbo car or in our case a deep breathing 6.0 that more air would be better, but none of the aftermarket intakes do much for us. What is the real reason here? Is it physics or vacume related in some way?

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When I I had my Evolution I ran into this same problem.  Aftermarket Intakes would actually make the car less powerful, in the K&N case I lost 26hp. You would think on a turbo car or in our case a deep breathing 6.0 that more air would be better, but none of the aftermarket intakes do much for us.  What is the real reason here?  Is it physics or vacume related in some way?

The real reason is that GM and other manufacturers have improved their intake designs over time. An aftermarket manufacturer "might" be able to make an intake that shows minimal gains for one vehicle configuration, but it will not apply to all configurations of similar vehicles (engine size, emissions equipment, transmission, gear ratios, etc, etc).

Their job is to sell you a bling-bling tube and cool filter for several hundred bucks. If they can produce ONE test on one vehicle showing hp gains then they can claim their product makes power. If their product FITS several vehicle configurations, then they can claim it is a product for those configs. BUT, rarely (if ever) do you see a product that was tested for each vehicle config it is sold for.

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I finally came up with one that works.

 

Remove the plate under the stock air box.

 

Cut a 6" hole in the bottom of the box

 

This is the only intake mod I have ever done that acutally gave me a real increase in performance. 

Do you have a stock filter or aftermarket? Do you think a 4" tube would be as effective? Did you leave the mounting plate out? If so how did you secure the box?

Do you seem to have the quicker response that everyone seems to mention about the more popular alternatives? Did you have your westers tune adjusted for a cai?

Sorry in advance for all the questions.

Thanks

dancar

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Do you have a stock filter or aftermarket?

 

Stock

 

Do you think a 4" tube would be as effective?

 

no. I didn't test it, but I would think bigger would be better. a 9" tube will just fit over the break duct. If I had one that big, I would use it. I did a little basic math. With no friction, or compressibility loss, the velocity of the air in a 4" tube with a 394ci engine at say 4000 rpm is around 60 MPH. With a 6" tube that speed drops to around 35 MPH. To me, that meens you need to be doing over 60 MPH at 4000 rpm to make true ram air with a 4" ram air tube. Increase it to 6" and you only need to be doing around 35 MPH. The ram air would become effective sooner, thus giving you more power, faster in your run.

 

Did you leave the mounting plate out?

 

yes.

 

If so how did you secure the box?

 

I didn't. It doesen't seem to move enough for me to worry about. I may build a bracket at some time, but I am not in a hurry to so that.

 

Do you seem to have the quicker response that everyone seems to mention about the more popular alternatives?

 

I don't have a calibrated butt. That is what I use the G-tech for. I don't notice any difference in tip in, or responce.

 

Did you have your westers tune adjusted for a cai?

 

no. I thought there was lots of room in the program for the small anount of air increase. that is what the mass air meter is for.

 

Sorry in advance for all the questions.

 

No Problem! Fire away!

 

Tim B.

No sweat. I just didn't want people thinking I stole their idea. I just figured it was time someone put some real world numbers down.

 

dylanvonkleist,

IMHO, you are right. The ramair Volant should be the same thing. I have not tested the Volant. I don't understand how it would be any better than the ones I did test. I don't understand why I never got a good power increase with an aftermarket system in THIS truck.

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