Best Performance mods for the buck

[TheyCallMeDale]

word, if it doesnt have to cost a crapload im definately doing it. How much does it rely on a dyno to properly tune. Those can get expensive

[325 eta]

hey eurospeed you forgot bmw_e30 has his V-tec sticker that adds like 20 hp.

[Brew]

Unless you have a free weekend or two to pull the tranny, I think the lightweight flywheel is something you do the next time you replace your clutch, as it isn't really worth the time and money to do by itself. A good tune-up, a well flowing exhaust, and a chip is the way to go.

[Jarvis]

I've never heard of ANY car having a 20% driveline loss. I always thought that 17% was the norm for an average car, and that BMWs (especially ones w/ standard transmissions) were by rule generally more efficient at getting more power to the ground. It's hard to tell what the average driveline loss is for E30s, since all remaining models are in varying degrees of condition. And I doubt that any of them still run like they did the first few years after they were bought. European Car magazine recently dynoed a bone-stock E46 328i and saw only about 11% driveline loss. This is supposed to be the accepted figure for newer BMWs. 20% on any BMW, even if it is 17 years old, is a bogus figure.

[Jand3rson]

hey eurospeed you forgot bmw_e30 has his V-tec sticker that adds like 20 hp.

Oh right, I forgot about that.

[Jonathan M3]

No. It is closer to 17-18% for 15-20 year old cars.

The guy that dynoed my car gave me the figures and said because Dynapacks are pretty accurate compared to other dynos, you use 1.23 for RWD cars instead of 1.21 or 1.22 like you do for Dynojets or Mustangs.

That statement contradicts itself. You are correct that 17-18% is the correction factor used for a bmw, or any other rwd IRS manual tranny car. Therefore to correct you use 1.17 - 1.18


for reference:

rwd, solid rear axle, MT - use 15%
rwd, solid rear axle, AT - use 19-20%
rwd, IRS, MT - use 17-18%
rwd, IRS, AT - use 21-22%

[BloodLine]

So Dale are yoy going to buy that 87' 325is?

[schnitzer teil-jäger]

LOL Hey TCD welcome to the world of the e30!!!!!
w

http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=%22like+arguing+with+%22

[TheyCallMeDale]

its possible.....

[theberglar]

A summary of dyno results reported by NA m20 owners:

Jason99T/A: 135.5 rwhp on a '87 325is with 250k mi, bone stock
E30godz: 135 rwhp on a 325i with 120k mi, with a Dinan chip and intake
Dave (325ic): 138.4 rwhp on a 325ic, with 19# injectors and intake
1highbeam (BFc): 139.3 rwhp on a 325is 120k mi, with BavAuto chip and intake
TCD: 147rwhp on a 325i with 150k mi, bone stock
SlammedE30: 150 rwhp on a 325i with 100k mi, with a Jim C chip
matt325is: 154.6 rwhp on a 2.8L stroker 325i, with exhaust, injectors, fuel management (?)
bmw_e30: 160 rwhp on 325i with chip, intake, and exhaust
SlammedE30: 177 rwhp on a 325i 3.0L with cams (?)
Dave (325ic): 181 rwhp on a 325ic 3.0L with intake, m30 afm, 19#, exhaust
SlammedE30: 186 rwhp on a 325i 3.0L with cams, 21.5#, exhaust

So, for a stock 325i, I guess 147 rwhp is a tad high. Still, though, the lowest stock rwhp is 135.5, making a 19% drivetrain loss, at most. Even in the BFc thread, bmw_e30 uses 19% drivetrain loss to get 189 flywheel hp (somehow).

So, with minor mods, it looks like the limit is about 160 rwhp, for a maximum total gain of about 15-25 flywheel hp. Correct me if I'm wrong about any of the mods when the dyno was taken. I tried to piece together what I could.

[chris_leo]

Low numbers, but the AFM is such an arcane device that its no wonder.

I'll bet if Jordan ever goes with a MAF his car will put out some really impressive numbers, given the headwork and what not.

But yeah, 3L M20s aren't very spectacular. I'd really like to see some MAF equipped three liter M20s with a wild cam.

[kidrobot]

325 eta wrote:
hey eurospeed you forgot bmw_e30 has his V-tec sticker that adds like 20 hp.

Oh right, I forgot about that.

Man and those four lugs combined with those
neon strobes are good for like another ten Euro....

If he does some shadowline, he might be sitting
@ 400whp!!!! :roll:

[Jand3rson]

I'll bet if Jordan ever goes with a MAF his car will put out some really impressive numbers, given the headwork and what not.

I believe he's going to be using the AFM from an E36 328i.

[Digitalwave]

SMT-6 can run any air meter. When my car gets a manual tranny (definately sometime within the first half of next year), I am doing the SMT-6 with a MAF and a bunch of other stuff.

[rwh11385]

Don't bother on the M30 AFM without something to properly tune it with. You'd need to bump up to a higher rate AFPR as well.

For bolt on performance, a chip is about it. Everything else is just for noise and looks.

Best performance mod for the money is still a drivers school.

-Charlie

When is a higher rate AFPR needed? At a certain HP mark, or injector needs? I'm looking this summer at a MAF conversion with a 272 cam. I've purchased 21.5# injectors. I'm assuming if a AFPR is needed for the M30, I will need one, correct?

And i'm going to sign up for a drivers school in April. :D 8)