summit catalog says that it improve effeciency, so i assume it will make better gas mileage... anyone know if this is true? or anyone has there records of gas mileage before and after a superram setup. the reason i ask is if it does improve gas mileage, i would like to get it, i know it improves power. right now i have edelbrock base with as&m runners, ported plenum and stock tb. and if i would gain any more mileage out of a superram setup i would buy it.

 

I've read like a 1mpg difference in the city and up to 2 on the hwy, but honestly you'd have to do a lot of driving just to pay for the super ram itself.

 

i've got someone i can buy the plenum, lid, runners, all bolts, and new gaskets for $550 shipped. and i would sell my as&m runners and plenum in replacement of the super ram. i figure $300-$350 for the runners and $50 for the plenum. after all the math i lost $150 for the super ram, plus more power and possible gas mileage increase. the design of the super ram looks like it should have came from the factory that way and does look more effiecient. so does anyone else have any input on the increase in gas mileage?

i am going to take the intake off anyways to put on some edelbrock aluminum heads on. what does everyone think i should do.... put the as&m's back on with the ported plenum, or go super ram? without thinking about price difference, price is not an issue for me on this.

 

Well if you can pull that trade off, it would def be worth it. The more power you make, the less you have to mash the gas to get it to go on.

Superram is good for 20+ horse, thus you will use less gas.

 

You realize you lose low end torque with a super ram and low end power? Where do you spend most of your driving around town? I spend the VAST majority below 2500rpm so by your logic mileage would actually get worse.

 

my plans are to get a precision industries vigilante 2800 stall converter. i have 3.23 rear now, but i have a complete 3.42 disc rear and a 3.73 disc rear that i can swap in when im ready, but not sure which one i should put in. with the higher gears the rpm levels would go up, so it would put it in the proper rpm range.

 

With the superram or the gears you will lose some mileage.
With the vig converter you could gain a little around town driving mileage.
If you get the converter you will not need to increase the rear gearing for the performance increase.

 

How could you gain mileage getting a higher stall converter? EVERYONE that I know including myself had their mileage drop when higher stall converters were installed. And two guys that switched to 2800s lost significant mileage like 2 or 3 mpg.

 

To answer the how, the vigilante increases torque multiplication which reduces load as seen by the engine & requires less throttle to generate the same acceleration rate. A lesser quality converter that achieves it's stall rating by slip only will reduce efficiency and reduce fuel mileage, so it makes a difference on which converter design you pick. He specified vigilante which is a known and proven design.
The reason a good converter can improve mileage by torque multiplication, but increase rear gearing usually does the opposite is because the converter is load sensitive unlike the gears. The gears mulitiply torque all the time, but the converter does so only when the engine is loaded when you need it.

The vigilante is also a locking design, so mileage on the highway will not be changed at all.

A lesser quality converter slips to achieve its stall rating rather than to multiply torque.

 

Interesting, we only ran vigilante and lost mileage on all our vehicles. It was so bad the guy that switched to the 2800 wound up putting the factory back on. It requires less throttle, but the looser converter spins higher and faster with the same or even slightly less throttle. They're dang good converters though

And yeah our mileage on the hwy was the same. Also they dont unlock quite as freely on the highway which I thought was a good thing.

 

so i should stay with my 3.23 rear end? i figured with a 2800 stall vigilante that i should get higher gearing also. can you explain why i should stay with these gears?

 

Wow, how many vigilantes did you buy? perhaps you got one of the fakes?

 

Well I bought one, and three friends of mine bought them. I was in an F body club, and lots of them had vig's but I didn't really ask everyone about their mileage. I doubt they were fakes. I guess they could have been, I bought my from a local performance shop with a good rep, a buddy did the same and I honestly dont remember where the other guys got them. Owell they're a good converter either way.