My 3.46 diff in the roadster can be a bit exhausting on the freeway... Over 4k RPM @ 90mph. Sheesh. A 6-speed swap will happen one of these days.
96 320i Touring
98 Z3 2.8 Roadster
01 PY M Coupe
96 Z3 1.9 - DASC
95 318ti Clubsport
94 Miata M-Edition
13 smart fortwo
Where do you get a diff?
Paul
Yeah, the guy I bought my 2.8 Coupe from found me a 3.46 in a couple days. 42k miles on it no less! It replaced the 4.10 that was in there, but he let me keep that too. I hear those are gold to the E30 M3 crowd, but right now it's just collecting dust in the garage.
Nathan in Denver
1999 M Roadster, VFE V3 S/C, Randy Forbes Reinforced, Hardtop, H&R/Bilstein, Apex PS-7, Supersprint
1999 Z3 2.8 Coupe, Headers, 3.46, Manual Swap, H&R/Koni, M Geometry/Brakes, M54B30 Manifold, Style 42
I dont know BMW 5 speed manual where fifth was not 1:1. Imho it always is and makes most sense like that. In most six speeds the fifth remains 1:1 and then 6 is over.
Going to keep stock 3.15 rear end and add 6 speed some day.
Problem with almost all noise insulation is weight. Cheap noise insulation usually is not made for cars and such will suck water into it over time and then it really starts to weight, and corrode metal, and start electric gremlins etc...
Last edited by Remotion; 11-15-2017 at 07:04 PM.
Z3 & E36 RamAir systems, send private message for more information.
Yes, cars should only use Dynamat-type insulation, which is a sheet of lead backed with sticky butyl. It is expensive, heavy, difficult to install even in the easy places, and mainly designed for sound originating inside the car (trunk sound systems). And it does nothing for the sound coming through a Z3 roadster's thin canvas top and minimal window sealing.
Last edited by Vintage42; 11-15-2017 at 07:33 PM.
BMW MOA 696, BMW CCA 1405
I agree that this is the wrong car if you're looking for a quiet highway cruiser.
However....the OP looks to have a hardtop in his avatar image, so I was suggesting sound deadening with the possibility that it would bring the noise to a more reasonable level even though there are trade offs.
OP....what tires are you running? They might be a big source of noise as well.
2001 Z3 3.0 Coupe--Sterling Gray/Sunroof Delete/5MT
Numerous other manufacturers ADD a fifth (5th) ratio to an existing design to accomplish an overdriven final drive ratio.
My in depth experience with BMWs__really taking them apart__began with a '99 M Rdstr, but I have spent some five decades (>50 yrs) playing with cars from just about everywhere, so while BMWs subcontractors may have started with a clean sheet of paper for their gearboxes, not all manufacturers do the same. I stand by my original statement.
I live in AZ where we are spoiled. We have no water issues. Still, I think cheap insulation would work well inside the car, where there shouldn't be any water. It's probably not as good as dynamat, but it's cheap, almost no weight to it, and very easy to install. As an experiment, cut a piece to fit the well behind the seats where the top lays down. Drive the car. You will hear an immediate difference.
I've found mostly everything from Continental to be pretty darn quiet. I say "mostly" because haven't tried every model, but every one I've tried so far has been quiet. DW on my Roadster, ControlContact Sport on my Coupe. The latter are are A/S tires though...Coupe will get DW next spring if I can ever decide on a set of summer wheels.
Last edited by s8ilver; 11-20-2017 at 03:14 PM.
Nathan in Denver
1999 M Roadster, VFE V3 S/C, Randy Forbes Reinforced, Hardtop, H&R/Bilstein, Apex PS-7, Supersprint
1999 Z3 2.8 Coupe, Headers, 3.46, Manual Swap, H&R/Koni, M Geometry/Brakes, M54B30 Manifold, Style 42
The 310Z was the first box BMW used that was 1:1 5th. Previous five speed boxes, going all the way back the the last of the 2002 era, were 4 speeds (4th 1:1) with an o/d-ish 5th grafted into the back of the case.
/.randy
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