3.1L turbo ix

[TehRaydarlover]

Theoretically :drink:what would I need to do to accomplish this?
lots o $$$
IE 3.1 kit?
_________ turbo?
New front diff

[ak-]

a lot of spare transfer cases

[TehRaydarlover]

a lot of spare transfer cases

Suggested upgrades?

[acolella76]

I believe there's already a few turbo iXs out there... some that put down some srs horsepressure. Search e30tech.com

[nomansland92]

I'm currently boosting my ix. The biggest thing you'll need is to extend the front drive shaft. There's a few ways about doing this, spacers, bigger gubio, or welding on longer splines. There's a guy here that sells longer splines. The rest of the drive line is pretty good. Obviously you'll want to get a better clutch as well.

There's a few 500+hp ix around on the forums, I've heard they've been holding up pretty well also.

[MF DOOM]

The swedes have built some filthy IXs.

[nando]

a lot of spare transfer cases

Not really

[ak-]

Not really

Do u even iX?

[flyboyx]

a lot of spare transfer cases

actually, a lot of spare front diffs

[StinkE30]

Do u even iX?

Surely, you must be trolling.

[TehRaydarlover]

Is lengthening the splines going into the front diff the only thing you can do to strengthen it? Replace it?
Would the vc be able to handle the power?

[nando]

The transfercase doesnt work like that - also, drivetrains are rated by torque, not HP.

[downforce22]

Nando brings up a great point. By definition a transmission and diff combination is a torque multiplier.

The max torque of a stock m20 is 164 ft-lbs at 4300 RPM. Full throttle in first gear in an iX is not a big deal because it does not break transfer cases, front diffs, or axles. To find the torque multiplier of your car multiple the desired gear ratio by the final drive ratio. American iX's came in only 3.91(manuals) and 4.10(autos) final drive ratios. Also the first gear ratio in the manual is much higher than the auto (3.83 vs 2.48).

1st gear manual with 4.10 diffs:

Torque multiplier: 3.83 * 4.10 = 15.703

Max torque seen by driveline: 15.703 * 164 ft-lbs torque = 2575.3 ft-lbs.



2nd gear manual with 4.10 diffs:

Torque Multiplier: 2.20 * 4.10 = 9.02

Max torque seen by driveline: 9.02 * 164 ft-lbs = 1479 ft-lbs.

This pattern continues; as the torque multiplier decreases in higher gears the torque seen by the axles is also lower. Therefore the most torque applied to a drive line is in a manual iX with 4.10 diffs accelerating at 5800 RPM in first gear. At the worst case scenario of a stock m20, the iX driveline has to be able to handle 2575.3 ft lbs in the axles. I think it is fair to say the transfer case and diffs are adequately built to handle this much power. So how can this be used to our advantage? If we work backwards from 2575 ft-lbs we can find the torque the driveline can take in different gears before we are exceeded the known power rating of the driveline.

Max torque before exceeding stock drive line safety levels

2575.3 = x * 15.703, x = 164 ft/lbs torque in first gear (duh)

2575.3 = x * 9.02, x = 285.5 ft/lbs torque in second gear

2575.3 = x * (1.40 * 4.10), x = 448.6 ft-lbs torque in third gear

2575.3 = x * (1 * 4.10), x = 628 ft-lbs torque in fourth gear

2575.3 = x * (0.81 * 4.10), x = 775 ft-lbs torque in fifth gear

Remember I calculated this with 4.10 diffs for worst case scenario but the regular 325ix manual has 3.91 final drive which would actually result closer to 300 ft-lbs torque in second gear. What I am getting at is that unless you are launching the car in first gear, you should be fine with the iX driveline, just dont be stupid.

[TehRaydarlover]

Great info. I wonder what kind of factors of safety bmw used in the drivetrain.

The transfercase doesnt work like that - also, drivetrains are rated by torque, not HP.

Sorry I was talking about lengthening the axle shaft splines going into the front diff. Forgot to quote nomansland92

[downforce22]

Great info. I wonder what kind of factors of safety bmw used in the drivetrain.

This is something I wonder about too, especially considering q5quint's iX (not wildkarrde has it), mw255's turbo in finland, and ss45466's turbo all were pushing the drivetrain.