71 chevy

iTrader: (18)

FYI 2 things.

1. e50-e85 have almost the same resistance to knock. virtually identical.
2. latent heat of vaporisation of water is 2257 kj/kg for water, vs 1100 for methanol.

so, spraying the same volume of liquid, the water will pull 2x as much heat out of the charge.

you see all these guys go to straight methanol on their GAS setups because methanol as a fuel makes more power and torque than gas, so they pick up power and like it, but the methanol is not cooling the charge as well as the water.

im running straight methanol as my only fuel, and im putting a water injection setup on top of that.

Wicked69

So, I bought up about 12 gallons of the walmart brand washer fluid and that is what I was using last year but adding some methanol to it. I guess I should just run it the way it is then. It is 33% methanol and the rest water. It does not have the winter additives and seemed to work well.

Thanks for that info.

Also, looking at the different sites it seems a 3.42 is as low as they go in any kind of performance gear. I have 33 spline axles and definitely don't want to swap them out. If I just get a 3 series 33 spline spool and the 3.42 gear it is less than $400 to swap. It looks like it would still work well for the highway and allow me to not run out of gear for the 1/4. I know I could find a stock 3.31 but then I am using a used gear

71 chevy

iTrader: (18)

im all about saving money, so if the 3.42s would save you money then you gotta run them.

i would just keep using the washer fluid.

Wicked69

That's what I was thinking and surely I could sale my full spool and 3.90 gear to cover at least half the cost.

I will try the washer fluid straight with no methanol. You know now that I think about it. The week before it blew up we were trying more methanol in the mixture to see if it would pick up any ET. It did of course but it also blew up. Probably a good chance that I was loosing the cooling benefits of the water. Using it straight sure seems simple enough.

71 chevy

iTrader: (18)

i wouldnt rule that out. i like straight water myself(dont care what rodney at ais says )thats what i ran in my 4.8 with e85 and thats what i would run if i had to do it again.

Wicked69

Even if it is less than 70 percent?

Wicked69

Okay, spoke with Moser again and they have a 3.08 that would also work with my 33 spline axles. Nothing in between. So with the combo I have would you go with the 3.08 or 3.42? Sounds like you are saying that the 3.08 would still work plenty well. That would make it real nice on the street.

MLP00Z28

iTrader: (4)

Anyone tried this setup? I have a s60 with 4.56 gears but now that im going turbo, Im swapping gears, should we go lower than 3.42?

Packy

iTrader: (11)

I am in a similar dilemma with my Trans Am. I have 3.73's in it now and I running out gear at the 1000' mark. I bought some 3.08's but was sort of skeptical to put them in because I thought they might be too tall of a gear for my convertor. I will probably install my 3.08's soon and see how it goes.

Camaro9969

iTrader: (12)

I believe the s60 lowest you can go is 3.54s I could be wrong but that was the reason I didn't get the Dana to begin with

Wicked69

I have the 3.42's arriving today and will have them in in about a week or so. With the 30" tall tire should be just about a good compromise for the weight of my car, and running on the street. I let you all know how they worked out. Won't have any numbers until April. All the tracks are closed in our area until the end of March, first of April.

MLP00Z28

iTrader: (4)

You're right, thats the lowest gears available for the 60, but I run 28 so that should give me some advantage right?, here's the max mph speed per gear 1st:62 2nd:93 3rd:127 4th:165, what do you think about those numbers?

MIGHTYMOUSE

iTrader: (59)

i can't believe this has gone to two pages without your peak rpm and desired trap speed being asked or given.

that, and tire size are all that's required to select the right gear. not weight, not fuel, not converter, not power adder.

rear gear selection is MATH based. you want the most torque multiplication you can get. period.

-max engine rpm
-tire diameter
-top speed
-trans ratio (if not 1:1)
-converter slip (if no clutch active)

calculators all over the net can tell you the answer

hope that helps!

MLP00Z28

iTrader: (4)

You're right, I calculated my previous numbers with 7000rpm peak and 28 tire, no trap speed, since I used to race at the track but there's no track where I live now so I mostly street race my car

Wicked69

I know that normally that makes sense but thought there is a compromise between what the car weighs and how much of a mechanical advantage is needed to get it moving. My suspension works well but was worried that a 3.08 would actually make tire spin really bad and possibly not be able to get it corrected using the stock suspension. Was I not thinking correctly? Again, I thought using turbo's complicated it a little more.

I plan to run shift this at 6500 and have a rev limit of 6900 and want to make sure that I can run the 1/4 also but the 1/8th is what we mainly run, plus I street drive it about 15,000 miles a year.

With my 30" tall tire I should be able to run a 150mph in the 1/4 at that rpm and that is what I wanted. 3.08's would have just made it nicer on the street but figured it would be much more difficult to get it to hook like it does now.

Please set me straight if I am not thinking correctly. Just trying to learn.

Thanks

MIGHTYMOUSE

iTrader: (59)

if you need to do that, it may help with any specific combination YES
but
what i'm saying is that it's not the gears fault.. better money spent to fix the real issue and not a band-aid.. the car will be quicker for it.

with what you said, and a rear tire that large, you would be good with 3.42.
3.23 on a 28" tire.

if you want to compromise then sure no problem, just be prepared for it to not perform like it could. you asked OPTIMUM

Sales@Tick

iTrader: (3)

A higher rear gear(lower number) will reduce starting line ratio which will reduce the chance of wheel spin. It will increase wheel speed though.

A lower rear gear(higher number) will increase starting line ratio which will increase the chance of wheel spin.