Very cool parts stack injection
 

Does anyone here have some experience with VCP's stack injection. Pros, cons?
Thanks
DU

DU, I have Wayne's VCP stack injection on my 302. You will hear varying opinions about them. Many have had a great experience with them while others have gone mad trying to tune them and some have even given up.

On the positive side--the manifold itself, the hardware and the related computer gear is high quality. I have the SDS programmable ECU that Wayne used up until about a year ago. He has since switched to the Redline system which I have heard is an improvement from the SDS. The Redline allows downloading to your computer while the SDS does not.

After installing the complete system in my car during the build, the car started on the first try and ran pretty good, using a pre-programmed map that Wayne supplies based on your engine. It is very easy to get the car running so that you can cruise around. The hard part is getting it running at maximum performance.

Which brings us to the cons:

It is not a plug and play system. You will have to spend time, considerable time, tuning the engine if you want to get it running perfectly. If you use a dyno, it will go quicker but will cost a lot as you will need many pulls as you make numerous changes to all the different parameters of the programmable ECU. You should get a wide-band O2 sensor, which will allow you to monitor your air-fuel ratio without a dyno and allow you to make adjustments to the computer as needed. This will cost about $500.

If you are computer savvy and like tuning an engine, then you will love the stacks. If you just want to get in and drive and never have to fiddle with the car, the stacks are probably not a good idea.

You might want to call Wayne and see if there is anyone in your area with his system on their car, then you can see for yourself what is involved.

I have to tell you, though, that you just cant beat the WOW factor when you open the hood--everyone drools over these things.

Take care and if you have any questions, shoot me an e-mail: TVJV82@aol.com

Tom

I really appreciate your un-biased opinion. Thanks much
DU

take a look at these with the fuel rail down the middle, much cleaner looking.
http://www.twminduction.com/v8_kits/351.html
http://www.twminduction.com/v8_kits/427.html

Does anybody know who makes the throttle bodies that VCP is using on their injection system? Very short as compared to the TVM offering, thus leaving a lot more space for air cleaners, stacks under a Cobra hood.

Hankcar is correct on the inboard fuel rails. Much cleaner looking on the TVM unit.

Chris

Than again they are only 50mm throttle bodies. From what I have read 58mm units is the way to go on a stack injection on a 427 or above.

VCP uses the same 50mm throttle bodies on the 302 as well as the 460.. This does not jive???/

Chris

50mm x 8 stacks = 400mm of air flow......that would be like having a 10" throttle body on a fuel injection system!! WOW, did I do those calculations right?

Rob,

You would think that by doing the math you mentioned it would be enough. Same thinking here. But I constantly see most of the fuel injections built with 58mm throttle bodies on them for a BB Ford.

Heck what is the single throttle body on the 4.6L Fords 70mm or 72mm. Now compare that to the 400mm you just calculated. Something does not jive.

Than again maybe 50mm is more than large enough for a BB and 58mm is over kill. Maybe someone in the know will chime in.

Chris

I would love to put this setup on the coupe. It would probably add some HP and would look period-correct too!

Now I know why I spend part of every day tutoring mathematics. In geometry we learn that the are of a circle (or the cross sectional are of a cylinder) ir equal to pi r squared. In this case one must consider area not diameter. A 50mm throttle body has a cross-sectional area of about 1963 mm squared. Multiplying that by 8 we get 15708 mm squared. The dividing by pi and taking the square root we get a radius of about 71 mm or a diameter of 142 mm. Therefore 8 50 mm throttle bodies are equivalent to one 142 mm throttle body not 400 mm. Also, consider in your comparison that the single throttle body on a modern V8 is only feeding about 2 cylinders at a time ( I say about because it depends on the duration of the intake valve open period.) Using the above mathematics, feeding 2 cylinders with two 50 mm throttle bodies is equivalent to feeding them with one 71 mm throttle body. Hope that helps in the comparison