[braddman]

So the time has come to either

1) Purchase a Nissan GTR or
2) Modify the 335i and save $50,000.

...and I love my 335i with a passion. This is the best car I have ever owned, including my 800whp Supra. No comparison.

So, I have the 6AT, and I need to know what my options are from people who have actually ran more than 550-600whp. I'd like to be in the 700whp range.

I've done a ton of research but I need some real world. Who has Level 10, who has stock in good condition, etc. I do NOT want the manual, this transmission is amazing, and I love it.

Please respond if you're running 6AT *NOT DCT* and have some power going through it.

[135Pats]

I'd like to think I fit the bill.

You/we have no options right now. None. There are some promising (genuinely) solutions coming down the pike that are being actively developed by two companies - one state side, another down under. These solutions account for both the tuning (TCU) side and hard parts. Unclear to what extent it will still require DME tuning to cut torque in high load, high gear shifts. We'll have to see.

Level 10 is a complete waste of time and money, skip it.

[MM Performance]

I've ran 650whp on my auto for some time mainly rolling launches. No slipping yet but will slip if I launch really hard in 1st or second. I think Nizpro is coming out with a great solution that includes flashing the TCU for higher line pressures and altering the shift times (only one with the critical flash). Level 10 doesn't work from everything I have read from people that have them including terry, and they won't honor their warranty after it breaks.

[MM Performance]

Originally Posted by 135Pats

I'd like to think I fit the bill.

You/we have no options right now. None. There are some promising (genuinely) solutions coming down the pike that are being actively developed by two companies - one state side, another down under. These solutions account for both the tuning (TCU) side and hard parts. Unclear to what extent it will still require DME tuning to cut torque in high load, high gear shifts. We'll have to see.

Level 10 is a complete waste of time and money, skip it.

Who is the other company besides Nizpro?

[alpin3d3vil335]

Mid 600's here and so far so good.

Some promising options coming from NizPro and Propulsive Dynamics.

[Blaster400]

Mid 600's here too and no problems yet. I definitely plan to go with either NizPro or Propulsive Dynamics upgrades when their product offerings get sorted out and their results are proven.

[Stucks]

I've got prob around 580whp and a level 10 torque converter + valve body. My stock trans started not going into 5th after beating on it with high boost and stock turbos for a couple years, so that is why i upgraded. I've had it now for about 7-10k miles, no issues. Level 10 seems to be hit or miss. I've talked to people who have had success with the transmission stuff they sell, and then again I've talked to people who have had absolutely horrible experiences with their personnel and products.

[BeastMode335i]

Are you guys with higher HP #'s doing more maintenance on the transmissions or sticking to the stock guidelines..?? Such as filters, fluids, etc..??

Thanks!

[wren57]

Someone correct me if I'm wrong, but it's torque, not HP which kills a transmission. Many of the larger twin setups have gobs of torque and fall off up top. I'm looking for a large single which will keep torque down but allow for higher HP

[Jeff@TopGearSolutions]

Originally Posted by wren57

Someone correct me if I'm wrong, but it's torque, not HP which kills a transmission. Many of the larger twin setups have gobs of torque and fall off up top. I'm looking for a large single which will keep torque down but allow for higher HP

Yea we should really be talking torque. At the shifts that torque spike and load hit is the issue. Not the HP ramping up on the top end.

[T1M]

Theres a couple Nizpro transmissions going into a couple ~400wkw cars here (~580hp dynojet) for some testing. Hopefully we'll know more soon.

[Stucks]

Originally Posted by BeastMode335i

Are you guys with higher HP #'s doing more maintenance on the transmissions or sticking to the stock guidelines..?? Such as filters, fluids, etc..??

Thanks!

Not really, but when the level 10 modified trans went in, i put redline d4 fluid in it. i always warm the car up to operating temperature before getting into the throttle any

[Jeff@TopGearSolutions]

Originally Posted by BeastMode335i

Are you guys with higher HP #'s doing more maintenance on the transmissions or sticking to the stock guidelines..?? Such as filters, fluids, etc..??

Thanks!

I plan on doing my trans fluid at 50K. With a stock car 100K would probably be ok but it's worth the fluid change on an upgraded car. Heat is the biggest killer on transmissions and so is old fluid. My .02

[wren57]

Originally Posted by Jeff@TopGearSolutions

Yea we should really be talking torque. At the shifts that torque spike and load hit is the issue. Not the HP ramping up on the top end.

That's what I thought. The more I look into a single the more attractive it becomes, granted it requires more fuel. A fairly flat torque curve with around 500tq will get the top end up near 700whp and won't compromise the trans as much. On the other side, twins the torque falls off so fast that when an upshift is made the increase torque load on the trans is tremendous. That's where stuff breaks. So as crazy as it sounds, I think a big single is a better choice for an auto than twins.

[ferocity02]

Nizpro is coming out with a 6AT solution, however it hasnt been proven to any extent. Don't know about you guys, but I'm not going to be in the first group to try it out.

I would go with a 6MT swap, its about 1/3 the cost of the Nizpro solution if you get good deals on the parts. AND a manual trans will always be more reliable.

[wren57]

Originally Posted by ferocity02

Nizpro is coming out with a 6AT solution, however it hasnt been proven to any extent. Don't know about you guys, but I'm not going to be in the first group to try it out.

I would go with a 6MT swap, its about 1/3 the cost of the Nizpro solution if you get good deals on the parts. AND a manual trans will always be more reliable.

Yeah but an AT with about 150 less HP can still hang with a MT

[Milan]

Don't bother trying to argue with the manual transmission people on here, they just simply don't get it. They think it's better because 20 years ago when they learned to drive all the autos sucked.

Your theory about the single turbo making more HP and less torque than twins was mine also. I'm on pretty low boost so far, probably around 550 whp but I haven't had any problems yet. I did do new fluid when I did the ST swap. I also have alpina tranny flash.

There was a guy on the other forum making 787 tq with level 10 valve body and tq converter. Not sure if he ever updated the thread or not.

[braddman]

This will probably determine my course of action. Would anyone recommend rebuilding the stock one regardless of whether I'm having problems or not?

[DennisPacMo]

I can tell you that Ken (Wedge) has 645whp and over 100k on his stock unmodified 6AT. Only fluid and filter/pan changes.

[Sered]

Originally Posted by wren57

Yeah but an AT with about 150 less HP can still hang with a MT that doesn't have the shift bog fixed.

Fixed that for you.

[Milan]

Originally Posted by braddman

This will probably determine my course of action. Would anyone recommend rebuilding the stock one regardless of whether I'm having problems or not?

No because I don't trust most shops to do a proper rebuild. There is something that Pure turbos discovered relating to line pressure in gears 4,5,6

[ferocity02]

Originally Posted by Milan

No because I don't trust most shops to do a proper rebuild. There is something that Pure turbos discovered relating to line pressure in gears 4,5,6

You're talking about a won bushing which leaks and reduces line pressure.