Anyone wanna guess what this is?

[Jeff Williams]

ummm hitman.... there is something LESS than WOT in the Q? Cause maybe its just mine, but every time I get in her, theres no half-way, the pedal just miraculously (by way of the magic that tech was pointing out), hits the floorboard.... *shrug*

A couple speeding tickets, a "Following too closely", and an aggrivated speeding ticket, rising gas prices, and a couple mortgages, and the gas pedal no longer "magically" goes to the floor.

Rob, I am sure you are much more anxious to get the Q back, than we are to listen to the soundtrack.

[Q45tech]

Well a 15% higher diff ratio means 15% more rpm at the same speed. I was never referring to acceleration mpg which is a variable.

Just assuming you hold the same highway speed the consumption on the highway will be 15% more per hour/min/week.

Agree the city mileage hit may or may not be 15% probably half that depending on how frisky you are. Lets say that city and highway combined might be only 9-10-11%.

I have averaged 19.1 mpg over the last 14 years [13,822 gallons to date give or take 1 haven't filled up today]........seems to be getting a little worse this year with local gasoline changes.That would have been 1,617 gallons more.........just $2,300 more gasoline from day one. The average price of gasoline consumed since June 1990 was $1.42............far below the current $2.15Let's say 2 mpg mixed drop.

The Audi S8 [4.2 liter] of a few years ago showed this vividly when they bumped the diff ratio to improve zero to 60, they lost 2 mpg combined.

[Jeff Williams]

Dennis, that is why I hesitate to do the swap. I would love better 0 to 60, and 70 to 120 times, but don't really want to take the hit on mileage.

I have put 101,000 miles on my car, in the last 2 years. at an average of 19.1 MPG, that would be 5,290 gallons, or roughly 2800 gallons per year. Roughly $6,000.00 per year, in gas at today's rate.

A 10 % hit would only be $600.00 per year, or $10 per week. A little over $1.50 per day, or $.07 per hour

Let's say I do the swap, and keep the car for 2 more years. That adds another $900.00 to the equation for the new rear-end, or $.05 per hour.

Let's also figure a 10% increase in gas prices, every quarter. This comes out to roughly a $1,550.00 total hit, over the 24 month period for the gas, and $900 for the swap. I would have to add at least one set of tires, to the equation, at $750.00

Now I am looking at a total 24 month cost of $3,200.00, or $.1831501 per hour.

That is about the average wage of a skilled laborer, in some 3rd world countries.

[AZhitman]

Now calculate the TIME you'll save, getting from A to B quicker...

[Jeff Williams]

Now calculate the TIME you'll save, getting from A to B quicker...

Ithought of that, but then would have to calculate a worse gas mileage, and possibly factor in a few speeding tickets, and maybe even a street racing ticket, and some jail time.

That throws the formula a curve, and not being a statititian, I will stop where I am.

[Chally]

What's the pipe size, for us the other side of the world?

[rsiwicki]

2.5"

[Chally]

Thanks

[Jeff Williams]

I would prefer the kit be available in the 2.25" size, as well. FOr those who aren't interested in Forced Induction.

Can't wait to see the finished product, in stainess.

[Chally]

Jeff, the best size for the Datsun 510 a 1.6L, was 2 1/2" so you don't need forced induction to use this size. The only problem may be more noise than you would like.

[Jeff Williams]

Thanks, Chally, That's fine, I just didn't want to loos the little bit of back pressure the system has, an hurt the low-end torque any more.

Noise is not too much of an issue. A little more might be nice. Just no Mustang/Flowmaster sounds!!!

Dennis made a comment about loosing torque, if the exhaust was oversized. I have seen this on some race cars, in the past.

We would add mufflers, to get better response, out of corners. A lot of people thought we were mad, when we showed up to a short track, with mufflers on the race car. We never did and X-pipe, though. If I were still involved with it, and had readily available acces to the Dyno, I would definitely try it.

[Chally]

Yes, you are 100% right. My Q goes like a scalded cat, even with the original pipes on it, which are pretty small. To loose the low down take off would hurt more than getting a nice sound.I'd really like both...