DSP e30 power gainers

[Balleristic31]

I judge how fast my lap is by how long I ride the rev limiter in certain spots on the course ;)

[bmwguy325is]

I figured that's what you meant. 3.64 is not legal either. It never came in a US spec 325. The 4-cylinder cars are not on the same line (318is) or class (318i), so updated/backdate is not applicable.

Hmmm off to count some revolutions......:hitler:

[brian52555]

I feel like I'm stuck shifting between 2nd and 3rd a lot with the current setup, which costs a lot of time as 2nd is hard to find in my getrag box. I can't tell you how many times I've missed 1-2 because the engine/gearbox has shifted. I've got the silence motormounts and upgraded e28 trans mounts. 3-2 is better, but still notchy.

I think the key here is that I'm perhaps not as aggressive or willing to ride the rev limiter in second, hence the constant 2-3-2 action.

No matter, getting a zf 6 speed with 3.15 diff put in right now. :) Hopefully for super twisty courses I can just keep it in 2nd now.

I calculated my gearing for that and it is pretty much exactly in between my current getrag/4.10 setup and my e46 5-speed. With a nice 6th gear for the highway. Can't wait...

[brian52555]

BTW nice clean runs...

[Nsquared97]

Unless your at a fast National Tour event, I personally would want to minimize the 2-3/3-2 shifts if possible.

Garrick, When you were running the Tour events (or any big events) at Grissom, were you hitting 3rd a lot or no?

[Jean]

I figured that's what you meant. 3.64 is not legal either. It never came in a US spec 325. The 4-cylinder cars are not on the same line (318is) or class (318i), so updated/backdate is not applicable.

OP - Listen to him, DSP guru :)

[bmwguy325is]

Hmmm off to count some revolutions......:hitler:

OP - Listen to him, DSP guru :)

Ya Ive slept since i bought it. I think that is one of the ratios they wanted me to get. Its great on the track
I just went out and checked its a 3.73.

[E30 Racer]

Unless your at a fast National Tour event, I personally would want to minimize the 2-3/3-2 shifts if possible.

Garrick, When you were running the Tour events (or any big events) at Grissom, were you hitting 3rd a lot or no?

Hitting third, sometimes. Mostly at Tours, during some locals, not very often during the ProSolos. Had a flatout third gear slalom at Grissom a few years ago. Big fun!

IMO, a 4.10 is too much gear for any "stock" M20B25/Getrag used in an autocross environment with a competitive tire size (including the 285/30-18 ). Yes, you can and should bump the limiter up a bit to provide a bit more speed at the top end of second, but you'll break rockers trying to accomidate the revs a 4.10 imposes at high speed (in second).

A 4.10 with 275/35-15s? That's crazy talk!

[Jean]

With the stock DME I was on the limiter for almost seconds on the longer courses, missed not having a spare chipped DME. Switching up/down a gear was almost a gamble too.

What's the tranny gearing on the m20? I know with m30 + m30 g260/6 even 3.73 would be way too short imho.

[bmwguy325is]

what's the tranny gearing on the m20? I know with m30 + m30 g260/6 even 3.73 would be way too short imho.

1:3.83 2:2.20 3:1.40