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| DaleD | Couple easy questions | ||
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Senior Guru
 
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No, I'm not asking about the Hyundai, I took CC's banning warning to heart.
I'm going to replace the FPR with my injectors. Should I use an adjustable FPR. My car is stock, I doubt it matters much. Second, one of the guys at my shop said if I really want to wake my car up, I'd put new gears in the rear. I mentioned 3:43, and he thought 3:73 would be better. I have a stock, a4 87 coupe. I thought 3:73 was too much for that car to push? Thoughts on that one? |
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Posted on: 2010/10/7 20:29
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| rklessdriver | Re: Couple easy questions | ||
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IMO - An adjustable FPR on a stock engine offers you nothing except the capability to get your fuel pressure out of wack.
The reason he says 3.73 - is because it's most commonly availiable aftermarket gear ratio for the D36 which comes in A4 trans C4 Corvettes. To put a 3.45 in your car you would have to buy a D44 out of a M6 trans C4 Corvette. 3.73 gear will be no problem unless you plan on crusing the Auto Bahn everyday. Will |
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Posted on: 2010/10/7 20:40
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| 1Fast04Vert | Re: Couple easy questions | ||
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First find out if you have the 2.59 ratio or the performance 3.07. If you have the 3.07 then you are good for a street driven car. If you have the 2.59 then watch for a D36 with 3.07 ratio in the 4sale section of CF. To just swap rears vs rebuilding is the cheapest way to go.
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Posted on: 2010/10/7 20:58
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| DaleD | Re: Couple easy questions | ||
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I know I have the 3:07.
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Posted on: 2010/10/7 21:02
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| 1Fast04Vert | Re: Couple easy questions | ||
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Then you are good unless you want to take it on the track. If you want to 'wake it up' then look into intake and exhauust mods. |
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Posted on: 2010/10/7 22:26
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| josephf31 | Re: Couple easy questions | ||
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I agree 100% on both counts. An adjustable FPR is really pretty much a waste with stock injectors. And you WILL notice the difference with a 3.73 rear end compared to the 3.07. Sure you'll burn more gas, but fun has it's price LOL |
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Posted on: 2010/10/7 22:33
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| flyboy | Re: Couple easy questions | ||
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If your car is an auto., at 3000rpm's in 4th you will be doing 103 with the 3.08 and only 85 with the 3.73. At 2500, it's 86mph and 71 respectively. I would think about a 20% drop in mpg. Pretty big diff.
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Posted on: 2010/10/7 22:57
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| Ultraman | Re: Couple easy questions | ||
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40 to 50 horse by opening these up. I'm thinking that would help out a lot. |
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Posted on: 2010/10/7 23:28
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| CentralCoaster | Re: Couple easy questions | ||
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FWIW there is no such thing as a new 3.45 replacement, at least not at a price you'd be willing to pay. If you want a 3.45 it'll have to be used. In which case you might as well buy the whole pumpkin, sell yours, and avoid the setup costs altogether.
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Posted on: 2010/10/8 1:24
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| josephf31 | Re: Couple easy questions | ||
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Thanks for doing the math, sounds about right (though I wouldn't go as far as a 20% drop in mileage, maybe 10%), still... My '66 Nova was turning 3000 rpm at about 65 mph, she had a 4.11 rear (with a 327), talk about get up and go LOL Like I said before, fun has it's price! :-) |
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Posted on: 2010/10/8 1:50
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| CentralCoaster | Re: Couple easy questions | ||
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Why not 3.55s? Seems like as high as you can go without really killing mpg.
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Posted on: 2010/10/8 2:26
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| Matatk | Re: Couple easy questions | ||
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I lost 2-3 mpg from 2.59 to 3.07 for a comparison. |
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Posted on: 2010/10/8 15:57
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