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      03-09-2008, 12:01 AM   #1
natetgreat
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what would be a decent horsepower # for the 135i

i have a 2001 trans am with 430hp and 415lbs of torque, and when i get the 135i i would like to have a decent amount of horsepower,and i was wondering what would be a reasonable amount hp# to the wheels for the 135i. I was thinking about 380 or 390 hp and maybe 390lbs of torque, is that reasonable number or am i just dreaming please correct me if im wrong
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      03-09-2008, 12:35 AM   #2
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Nope, that is about what peole are getting with a tune, catless downpipes, intake, and FMIC. Generally closer to 410-420 ft lbs to the wheels though. The stock turbos are just tiny, and start to run out of steam at high RPMs. With alky/water, or racegas you could see a bit over 400 rwhp. Realistically, getting much past 400whp on street gas will take bigger turbos.

You can get 380-390rwhp/415rwtq with basic boltons, though.

PS: To give you some perspective, here's a 335i with a tune and a catback racing an LS2 GTO:
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      03-09-2008, 09:13 AM   #3
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Quote:
Originally Posted by E82TT6 View Post
Nope, that is about what peole are getting with a tune, catless downpipes, intake, and FMIC. Generally closer to 410-420 ft lbs to the wheels though. The stock turbos are just tiny, and start to run out of steam at high RPMs. With alky/water, or racegas you could see a bit over 400 rwhp. Realistically, getting much past 400whp on street gas will take bigger turbos.

You can get 380-390rwhp/415rwtq with basic boltons, though.

PS: To give you some perspective, here's a 335i with a tune and a catback racing an LS2 GTO:



wow those not numbers are not bad for basic boltons, with those numbers and the weight of the car, wow thats going to be a fast car. :thumbup:
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      03-09-2008, 10:28 AM   #4
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Quote:
Originally Posted by natetgreat View Post
wow those not numbers are not bad for basic boltons, with those numbers and the weight of the car, wow thats going to be a fast car. :thumbup:
yea, very quick car.
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      03-09-2008, 11:04 AM   #5
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the 135i is also a couple hundred pounds lighter and much better build than the trans am. I had a 2001 Camaro SS fun car but just wasn't the whole package you get from a BMW.
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      03-09-2008, 02:55 PM   #6
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what mods would i need to get that amount of hp?
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      03-09-2008, 03:11 PM   #7
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Quote:
Originally Posted by E82TT6 View Post
Nope, that is about what peole are getting with a tune, catless downpipes, intake, and FMIC. Generally closer to 410-420 ft lbs to the wheels though. The stock turbos are just tiny, and start to run out of steam at high RPMs. With alky/water, or racegas you could see a bit over 400 rwhp. Realistically, getting much past 400whp on street gas will take bigger turbos.

You can get 380-390rwhp/415rwtq with basic boltons, though.

PS: To give you some perspective, here's a 335i with a tune and a catback racing an LS2 GTO:

Bolt-ons are not necessary for what you want. Dinan offers a "flash" of the ECU from BMW dealers that ups the N54 to 384hp/421ft-lbs at the crank. Easy to do and no hassles, though it is pricey at $1999. I would certainly go this route before I start messing with downpipes or water/meth for top end hp, etc.

But I guess it all comes down to what you want, If you goal is to make a drag racer, then yes a down pipes, alky/meth/water and octane are considerations.
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      03-09-2008, 03:19 PM   #8
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does every bmw dealership offer the dinan flash
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      03-09-2008, 04:34 PM   #9
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Quote:
Originally Posted by natetgreat View Post
does every bmw dealership offer the dinan flash
no, only a few do... And only those few will do Dinan warranty work... Any Dinan part voids the BMW warranty but Dinan replaces it with an identical Dinan warranty...
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      03-09-2008, 04:37 PM   #10
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300 is a decent amount, 350 is better, 385 is plenty.
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      03-09-2008, 05:36 PM   #11
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so if i do the dinan flash it would void my warranty
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      03-09-2008, 06:40 PM   #12
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Quote:
Originally Posted by natetgreat View Post
so if i do the dinan flash it would void my warranty
NO! Though if something does arise that might pertain to the Dinan flash, Dinan might have to cover that cost instead of BMW.
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      03-09-2008, 07:14 PM   #13
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Quote:
Originally Posted by natetgreat View Post
so if i do the dinan flash it would void my warranty
YES... you void your BMW warranty, but Dinan replaces it with their warranty which is identical to the BMW warranty... You only lose your BMW warranty to any part that the flash could cause a problem with, so for example if your suspension goes wrong then the BMW warranty is in tact... But if your turbos or engine dies from the extra boost then you have NO BMW warranty but the Dinan warranty will take over and cover the cost...

Essentially you have the same warranty, its just a matter of figuring out who is covering which part... Just and FYI But there have been some instances when BMW and Dinan says their not responsible and each points the finger at the other, is not common but it has happned...
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      03-09-2008, 07:32 PM   #14
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384 at the crank is only 326 at the wheels (considering cars loose 15% to drivetrain). you're gonna need bolt ons if you wanna make 400hp at the wheels. but on the bright side, the engine dynos 275hp stock so its making 323 at the crank stock.
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      03-09-2008, 07:48 PM   #15
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Quote:
Originally Posted by Vivid View Post
YES... you void your BMW warranty, but Dinan replaces it with their warranty which is identical to the BMW warranty... You only lose your BMW warranty to any part that the flash could cause a problem with, so for example if your suspension goes wrong then the BMW warranty is in tact... But if your turbos or engine dies from the extra boost then you have NO BMW warranty but the Dinan warranty will take over and cover the cost...

Essentially you have the same warranty, its just a matter of figuring out who is covering which part... Just and FYI But there have been some instances when BMW and Dinan says their not responsible and each points the finger at the other, is not common but it has happned...
They cannot CPO a Dinan car too.

With things like tunes, where BMW could easily argue that you added additional stress to the motor and drivetrain, they can have carte blanche on what they choose to cover. Dinan will argue most of those thing too.

I'm not inferring to not mod your car, just that you have to go into it as an informed consumer.

Magnusen-Moss Act was meant to keep dealerships from voiding your warranty for unrelated items, not for things that may very well be the cause of turbo/tranny/differential issues in the future.
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      03-09-2008, 08:00 PM   #16
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Wow I did not know that thanks for the info that really makes me think twice before I do anything too the 135i
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      03-09-2008, 08:42 PM   #17
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Paying $2K for an extra 84 horsepower/121 lb/ft torque seems like a very reasonable deal on a $35K car, especially with Dinan's warranty.
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      03-09-2008, 11:58 PM   #18
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Quote:
Originally Posted by mistermojorizin View Post
384 at the crank is only 326 at the wheels (considering cars loose 15% to drivetrain). you're gonna need bolt ons if you wanna make 400hp at the wheels. but on the bright side, the engine dynos 275hp stock so its making 323 at the crank stock.
Transmission loss is not static, easily illustrated by Dinan's testing of the 335i. While developing the tune for the N54 the engine was out of the car on a dynometer. That way Dinan can do real time testing and tuning of the ECU, etc.

They also provide us with the % of loss in their documentation after they did runs with the engine back in. It's all there and I am completely in awe how people looking at all the option for their car haven't at least looked into this wealth of information from a very respectable source.

BTW, Dinan claims 342hp at the wheels @ 5600rpms. It's all there, just waiting for people to read. Any source is worth reading, even if you hate the Dinan price.
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      03-10-2008, 02:29 PM   #19
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Quote:
Originally Posted by Numb3rs View Post
Transmission loss is not static, easily illustrated by Dinan's testing of the 335i. While developing the tune for the N54 the engine was out of the car on a dynometer. That way Dinan can do real time testing and tuning of the ECU, etc.

They also provide us with the % of loss in their documentation after they did runs with the engine back in. It's all there and I am completely in awe how people looking at all the option for their car haven't at least looked into this wealth of information from a very respectable source.

BTW, Dinan claims 342hp at the wheels @ 5600rpms. It's all there, just waiting for people to read. Any source is worth reading, even if you hate the Dinan price.
thanks for the info. Seems like they quote crank hp b/c they know most people don't know the diffference, strikes me as a misleading tactic. 342 seems kinda high btw, unless, like bmw with the N54 they are understating their crank numbers (but that would just border on the obsurd). have any independent tests been done?
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      03-10-2008, 03:15 PM   #20
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of course if you want 400+ RWHP get a PROcede, cat less downpipes, air intake, any decent cat back exhust, bigger higher flow intercooler and run 100 octane and you'll be there

PROcede $1600
down pipes $700-$1000
air intake $?
cat back $1000 for the 335i i imagine a bit less for the 135i
intercooler $900-1500
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      03-10-2008, 03:22 PM   #21
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Quote:
Originally Posted by Numb3rs View Post
Transmission loss is not static, easily illustrated by Dinan's testing of the 335i. While developing the tune for the N54 the engine was out of the car on a dynometer. That way Dinan can do real time testing and tuning of the ECU, etc.

They also provide us with the % of loss in their documentation after they did runs with the engine back in. It's all there and I am completely in awe how people looking at all the option for their car haven't at least looked into this wealth of information from a very respectable source.

BTW, Dinan claims 342hp at the wheels @ 5600rpms. It's all there, just waiting for people to read. Any source is worth reading, even if you hate the Dinan price.

Seems about right . .In my dealings with the 03/04 cobras and rwhp .. seems the manuals are about 11 - 12 % loss ..

thanks,
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