[lixiang7349]

How much tq can F90 M5 transmission handle?

[DrivenAgain]

I'm not aware of anyone that has reached that limit, yet.

[Eljeffrey13]

From what ive seen, cars are running over 1000hp and big tq numbers with built engines on stock trans, i would also like to know the answer to this question but from what i seen its a real strong tranny, its also the same transmission in the demon so that should give u some reference

[lixiang7349]

F10 dct is the one limited to 700 ish right?

[Eljeffrey13]

The dct's limit is around 650 wtq

[lixiang7349]

Originally Posted by Eljeffrey13

The dct's limit is around 650 wtq

Has anyone gone full e85 + catless yet?
Is Hpfp upgrade needed?
How much power expected?

[AngryInch]

Ya these trans are impressive and take a beating. Coming from AMG, the trans was always the weak link when pushing power.

[lixiang7349]

Originally Posted by AngryInch

Ya these trans are impressive and take a beating. Coming from AMG, the trans was always the weak link when pushing power.

Yeah? I've heard of the m177 folks using vtg 1000 with stock transmission.

[DrivenAgain]

Originally Posted by lixiang7349

Has anyone gone full e85 + catless yet?
Is Hpfp upgrade needed?
How much power expected?

with a proper tune you wont need full E85, but yes some have gone full E85, there is no aftermarket HPFP yet, ive seen zero fuel rail dips out to E55

[lixiang7349]

Originally Posted by DrivenAgain

with a proper tune you wont need full E85, but yes some have gone full E85, there is no aftermarket HPFP yet, ive seen zero fuel rail dips out to E55

Maybe add pi. I like e85 with catless for better smell.

[DrivenAgain]

Originally Posted by lixiang7349

Maybe add pi. I like e85 with catless for better smell.

I dont like smell either. I have my primary cats in place and only did secondary downpipes. Zero smell, and my performance hasn't suffered.

[lixiang7349]

Originally Posted by DrivenAgain

I dont like smell either. I have my primary cats in place and only did secondary downpipes. Zero smell, and my performance hasn't suffered.

You have two levels of catalytic converter?

[pbonsalb]

2 cats after each turbo. First cat is about twice the size of the second cat. Both are 400 cell. Both have been flow tested in the 520-540 CFM range, which is very good.

Easiest to just remove the 2nd cat since the 02 monitoring still works. You get some of the gains of catless with no downside.

As for E85, I would make sure pump and injector capacity are sufficient before going full E85. Most people seem to go E20 to E40. Any tuner should have an idea about pump capacity.

[Bfpd]

Originally Posted by lixiang7349

How much tq can F90 M5 transmission handle?

I've heard it's completely safe through 1000 nm, and reliable up to 1100 nm (800 crank ft-lbs). It can probably go higher, but you start rolling the dice at some point. I'm running ~760 ft-lbs without issue. I try never to go full torque until the tranny is warmed up.

[lixiang7349]

Originally Posted by Bfpd

I've heard it's completely safe through 1000 nm, and reliable up to 1100 nm (800 crank ft-lbs). It can probably go higher, but you start rolling the dice at some point.

What transmission model is put on it?

[Bfpd]

Originally Posted by lixiang7349

What transmission model is put on it?

A ZF 8 speed, but I don't have the exact model number.

[pbonsalb]

There are trans tunes that will slightly increase line pressure, which should increase torque capacity. But probably by the time you are at that torque level, you are also at or near the limits of the connecting rods in the motor.

[Eljeffrey13]

The dodge demon has 760lb-tq stock so u know the trans should be able to handle a good amount more… the factory never pushes factory components to the limit they always leave a good amount on the table to make sure its reliable… and its the same trans

[lixiang7349]

Originally Posted by Eljeffrey13

The dodge demon has 760lb-tq stock so u know the trans should be able to handle a good amount more… the factory never pushes factory components to the limit they always leave a good amount on the table to make sure its reliable… and its the same trans

Yeah I bet north of 800 lb ft. Which zf model is it?

[Eljeffrey13]

Originally Posted by lixiang7349

Yeah I bet north of 800 lb ft. Which zf model is it?

Dont have the exact model but i think its the highest and top model dont think they make one better than this one

[DrivenAgain]

ZF 8hp

[Eljeffrey13]

Originally Posted by DrivenAgain

ZF 8hp

Theres a specific number after the hp like 40 or 60 which tells u the tq rating on the trans because theres acouple different models like the one on the M3-4 is a zf8hp but hold alot less tq then urs