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  #21  
Old 10-23-2019, 01:18 PM
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.1 decrease 0-60 time = $1000 & DIY
 
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Quote:
Originally Posted by Happy View Post
The thing that would concern me most is the transmission.

You have a 2002, so if your transfer case is the same as mine you should be good there as long as both diffs are installed.

The automatic transmission has programming for shifting. If the ratios are changed, what effect will that have on the trans? Also, if the trans does accept the swap, but changes the shifting due to rpm increase, what effect would that have on a trans that has performed a certain way for its entire life?

You also stated, for improved 0-60. So I am assuming that at times the truck will be under full throttle, will the drive line be able to handle the changes to the original formula?
I have the Dinan transmission software installed so it is somewhat modified. Transmission will shift as programmed in Dinan software, not a problem. Shift points are set by RPMs so the shift points will all happen at lower speeds. Never know if something will break even if it is supposed to fail. The lower gear ratio increases torque so there is more stress on driveline parts. Mods sometimes expose the weak link. That's just part of the risks.
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  #22  
Old 10-23-2019, 01:29 PM
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.1 decrease 0-60 time = $1000 & DIY
 
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Originally Posted by Happy View Post
Have you thought this through?
Do you think I am missing something?

The only concern I have is that the change will cause a dash problem light that I can't get rid of or for some reason something like ABS or DSC becomes inactive.

I talked to a great BMW tech that I have known for years before I purchased the diffs. He was not sure but felt it would be plug and play. Then came the disclaimer that it was not something he had ever done.
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Last edited by bcredliner; 10-23-2019 at 01:44 PM.
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  #23  
Old 10-23-2019, 01:44 PM
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Quote:
Originally Posted by bcredliner View Post
Are you implying I am missing something?


Yes, Iíve been here since 01/2013. That is one nice truck you have there. I hope all goes well with swap. I personally havenít seen it done here, unless I missed it. We talked about doing it on the manuals, swapping out the 4.10 to drop rpm.

But, after I put thought to the idea, I decided playing with the drive line on a E53 was not for me.

But, like you said there are risks. I meant no disrespect, only concern for a awesome E53 build.
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  #24  
Old 10-23-2019, 01:53 PM
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It's a 5% boost. I'm sure the components can handle 5% extra but with the age, the weakest link could be found if something was close to braking. I'm behind the swap but the caveat is the 5% boost in rpm at freeway speeds might suck, however I think that might mean just bumps up to what mine already is if the transmission final ratio is the same.

Also: you will have a "spare" set of diff should you break the 4:10s


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  #25  
Old 10-23-2019, 02:03 PM
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Quote:
Originally Posted by Happy View Post
Yes, Iíve been here since 01/2013. That is one nice truck you have there. I hope all goes well with swap. I personally havenít seen it done here, unless I missed it. We talked about doing it on the manuals, swapping out the 4.10 to drop rpm.

But, after I put thought to the idea, I decided playing with the drive line on a E53 was not for me.

But, like you said there are risks. I meant no disrespect, only concern for a awesome E53 build.
Sounded bad. I edited it. It was a sincere question.

I think the transmission/torque convertor is the weakest link. It should have failed by now. I have a couple of options to beef up the transmission that will also improve 0-60 time if it fails.
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  #26  
Old 10-23-2019, 02:19 PM
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Question about change dif ratios.

That was my major concern, the trans.

At probably over 480hp by my math when you squeeze, plus the 5% that Andrew suggests, is a lot. On the high side, maybe Iím pushing 420hp on a a good day, and Iíll tell you I can feel it!

Maybe itís why they deleted the awd on the X5LM project. I am sure if they wanted a awd build they could have.

Last edited by Happy; 10-23-2019 at 03:03 PM.
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  #27  
Old 10-23-2019, 05:15 PM
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Quote:
Originally Posted by Happy View Post
That was my major concern, the trans.

At probably over 480hp by my math when you squeeze, plus the 5% that Andrew suggests, is a lot. On the high side, maybe Iím pushing 420hp on a a good day, and Iíll tell you I can feel it!

Maybe itís why they deleted the awd on the X5LM project. I am sure if they wanted a awd build they could have.
Meth gains vary depending on the application. And the hotter and/or less dense the incoming air the greater the benefit. 5% is very conservative for any application. Because nitrous makes incoming air cold and dense, the percentage of gain using meth is higher when I am not using nitrous.

For your math, stock was 340HP. Dinan stuff took it to 369 then the add on of meth, 150 shot of nitrous and electric cutouts. For 0-60, torque and torque curve are critical. Superchargers and nitrous do wonders for acceleration and the experience. I prefer the AWD, lots more contact patch to put power to the ground.
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  #28  
Old 10-23-2019, 05:48 PM
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Originally Posted by bcredliner View Post
Meth gains vary depending on the application. And the hotter and/or less dense the incoming air the greater the benefit. 5% is very conservative for any application. Because nitrous makes incoming air cold and dense, the percentage of gain using meth is higher when I am not using nitrous.



For your math, stock was 340HP. Dinan stuff took it to 369 then the add on of meth, 150 shot of nitrous and electric cutouts. For 0-60, torque and torque curve are critical. Superchargers and nitrous do wonders for acceleration and the experience. I prefer the AWD, lots more contact patch to put power to the ground.


Youíve gotta be over 500hp with NOS (squeeze) right? My math was using a 125 shot.

Thatís why I say on a good day for my setup, because I can feel the fluctuations. But when conditions are just right, sheíll lay you back in the seat!

I generally use 30hp for the meth injection as an average, but Iím sure Iím higher. I start squeezing at 3200 rpm progressively up to 80% of my pump, which is 128 psi. I can blow through a gallon of juice. Stock for me is 230 hp, 140 hp of boost, probably closer to 50 hp for the meth. But I agree with you, there are fluctuations.

That pretty cool though, Iíve never seen anyone with double squeeze (NOS, METH).
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  #29  
Old 10-23-2019, 05:54 PM
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Especially when the surface is less than perfect traction. My stock 3.0 blew away a pickup with 454 from a red light just because it rained.
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  #30  
Old 10-23-2019, 06:41 PM
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Question about change dif ratios.

The 5% was pertaining to Andrewís diff math. 500 hp with those diffís is definitely going to be a ride to remember in a E53.

I would love to hear that truck with the pipes open!
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