Turbo?
- Thread starter halfnhalf325
- Start date
The ZF4HP22 automatics do not have a reputation for durablility when pushed to the limit often. My 1985 318i had the first automatic transmission go at 800 miles. The second transmission (new) went at 40K, and beyond its warrantee period. I had a remanufactured one installed at that time and it was still in the car when I sold it at 205K miles. The later transmissions were a little better. My '89 325i w/Conforti chip has 120K miles and is still good. I do regular transmission fluid and filter changes. It still "chirps" rubber on the 1-2 upshift. So I don't know if yours will last or not. I believe they can take up to about 200 hp (I'm at about 180) but not too much more. Maybe an "e" engine with a mild turbo boost you may not get too high in hp and be safe. If this will be a street car and not spend too much time at the track I would think you'd be OK. A complete remanufactured (not rebuilt) unit runs about $1600 plus labor. Maybe someone else has more information. People that have been around BMWs for a long time tell me my transmission is approaching the end of its life expectancy. My tranny shows no signs of problems and my experience with the remfg one was good so I don't know what to believe. Good luck if you do it.
well i just had my first tranny go out at 186,000 miles and just got a new one i was looking at https://secure5.nexternal.com/share...usType=BtoC&Count1=516719996&Count2=433860421 inless i could find a better one, which i ahvent been able to do. what kind of work would i have to do to the tranny to make it handle mroe power? and it would be mainly a street car with some track use.
I have not found anyone able to give a good answer to that question. One thing that is beneficial is to keep it cool as possible, such as a larger oil cooler and good preventive care. That however does not give it the ability to really handle more power, just its longevity in normal use may be extended. We do have some E30 325i automatics that do the driving schools without incident but those engines are relatively stock (chip, intake, exhaust). Thus they have not likely exceeded 200 hp or so. The later model trannys seem to be longer lasting than the 85-87 model versions. The early ones also triggered the warnings to the emission testers because of the design. The tests caused some burned out transmissions. Procedures had to be adjusted for all ZF4HP22 transmissions. I do not know about the ZF3HP22 units that were used in 1984 but I suspect that the warnings exist for that model too. The original warning is still in effect to the testers today.
a turbo and an auto are counter productive...u want a stick to keep the turbo spooled....
in your case a mild supercharger might be better say, 5-6 psi
u will prob need to replace some or all of teh drivetrain after a while depending on its condition
rjp325i - if your auto is chirping your tires, look into some stickier rubber =] heheheh
i was able to chirp 1-2 on my 535i 5spd with stock 225 but now i have 255 in te back and it sticks like glue
in your case a mild supercharger might be better say, 5-6 psi
u will prob need to replace some or all of teh drivetrain after a while depending on its condition
rjp325i - if your auto is chirping your tires, look into some stickier rubber =] heheheh
i was able to chirp 1-2 on my 535i 5spd with stock 225 but now i have 255 in te back and it sticks like glue
I know the Bridgestones and the Michelins I have used are not the stickiest tires but the fact remains the transmission is still in good shape especially at 120K miles. The clutches still work as if they were new. Yoko AVS ES100s are next. The hot summers here do not make for good traction or long tire wear in any case no matter what the tire. When the air temp gets to 115 you can only imagine what the pavement temp is. For the best peformance a manual is most durable. When I was running domestic iron I had a traction problem. I changed to wider gumball tires. That solved the tire problem but then I started blowing clutches. I upgraded the clutch and then I sheared teeth off the main drive pinion of the transmission. This was solved by installing a HD Torqueflite auto in my supercharged 413 cu in Chrysler 300. The domino theory at work in a car. Thats one advantage of the small displacement engines. You don't have to worry about pulling 600 lb ft of torque at 2800-3000 rpm and the drivetrain stresses.