[rick100]

Originally Posted by Phyrexia

It slows down your 0-60 time, yes, but it speeds up your 0-57 drastically, and since 60mph/100kph is really just an arbitrary number, there's no reason to worry.

The amount of time you (should!) spend changing gears is easily overcome by all that extra torque under the curve!

Remember most cars are geared specifically so that a 0-60 run can happen in 1st and 2nd. 0-60 specs are important! But we know better.

I agree , just saying lower your gearing may affect the 0-60 for people that really care about that. And of course your rpm is going to be higher at highway speed , which I m assuming lowers your fuel consumption a little bit if someone really cares about that

[Phyrexia]

Originally Posted by rick100

I agree , just saying lower your gearing may affect the 0-60 for people that really care about that. And of course your rpm is going to be higher at highway speed , which I m assuming lowers your fuel consumption a little bit if someone really cares about that

Other than not being able to brag about a raw number, I can't imagine anybody having a legitimate reason to worry about a slightly decreased 0-60 time. All other things equal, a 328 with 3.73 gears will be faster from a dig, faster from a roll, faster on a highway, faster on a 1/4 track, faster on a road track, than a 328 with 3.23 gears. And the butt dyno factor alone is probably worth the cost of parts and my own sweat to install it.

This is a 15% torque increase to the ground we're talking here. It's a significant amount.

Admittedly if you had some way to arbitrarily stop both cars in a street race at 60mph actual speed instead of indicated speed, you might lose races with a 3.73 compared to a 3.23. I don't feel like doing the calculus this early to figure out if the ratio change would overcome the shift time by 60mph.

Highway RPM is increased, but as a result the motor is running with slightly less load at the same vehicle speed. Real-world results that I've found have indicated a 1mpg decrease, so it should affect my fuel economy less than the amount of coffee I drink in a given week does.

[Joebie]

Originally Posted by rick100

I find hard to believe you can clock 5.2 without some type of force induction or going down hill somehow

Did you see his mods? He's probably close to 300bhp. 5.2sec isn't too unbelievable is it?

Also yeah it may slow the 0-60 but like someone above me said, 60 is somewhat arbitrary. Usually I'm trying to accelerate to something like 70mph by the end of a highway on ramp or something which required 3rd gear for either car. I usually do 1-2-3-6 when merging onto a highway flowing at 80mph.

I still like my 3.73 diff. I like the torque that it gives 2nd gear the most.

[Biginboca]

Originally Posted by rick100

I find hard to believe you can clock 5.2 without some type of force induction or going down hill somehow

I didn’t clock it myself I use an app called “pro race”. So the accuracy is dependent on the accuracy of the ap/iPhone whatever that would be.

What would you expect my car to be? The 330i with no MILV’s/BPC Tune/AA Headers/3.73 rear diff does 5.5 seconds 0-60.

[rick100]

Originally Posted by Joester

Did you see his mods? He's probably close to 300bhp. 5.2sec isn't too unbelievable is it?

Also yeah it may slow the 0-60 but like someone above me said, 60 is somewhat arbitrary. Usually I'm trying to accelerate to something like 70mph by the end of a highway on ramp or something which required 3rd gear for either car. I usually do 1-2-3-6 when merging onto a highway flowing at 80mph.

I still like my 3.73 diff. I like the torque that it gives 2nd gear the most.

Have u seen the guys with a supercharger running 0 to 60 and they are putting bigger numbers higher than 300 at crank. They are nowehere near as 5.2. I dont think you quite understand what u need to get there.

[atmosphericM]

OK OK, 5.3 :P

[rick100]

Originally Posted by atmosphericM

OK OK, 5.3 :P

Wishfull thinking

[Biginboca]

Originally Posted by rick100

Wishfull thinking

Rick, do you also not believe a 2007 Nissan 350z which has 306hp and weighs 3300lbs doesn’t go 0-60 in 5.2 seconds? That figure is all over google. My car weighs 3200lbs has better (lower) gearing and maybe 10 less hp.

If you do the math you can see the numbers add up. I don’t know why you choose not to believe it. I asked you what you expected my car to do. What do you expect? Have you done any power mods to your car and tested them?

With all due respect I’ve given nothing but the truth in what I said and have nothing to gain by making this up. I share so others in the community can see what works and what the results are, and we can all make our cars better knowing what works and what doesn’t.

You seem to like sour grapes? They don’t make cars better or benefit the community.

[rick100]

Originally Posted by Biginboca

Rick, do you also not believe a 2007 Nissan 350z which has 306hp and weighs 3300lbs doesn’t go 0-60 in 5.2 seconds? That figure is all over google. My car weighs 3200lbs has better (lower) gearing and maybe 10 less hp.

If you do the math you can see the numbers add up. I don’t know why you choose not to believe it. I asked you what you expected my car to do. What do you expect? Have you done any power mods to your car and tested them?

With all due respect I’ve given nothing but the truth in what I said and have nothing to gain by making this up. I share so others in the community can see what works and what the results are, and we can all make our cars better knowing what works and what doesn’t.

You seem to like sour grapes? They don’t make cars better or benefit the community.

yes I ve done everything you have done except for milvs and differential and I dont believe you can clock 0-60 in 5.2 secs without any type of force induction , even then it may be hard

Here is the OPs car which has the exact same mods you have , plus is a 128i which is lighter than your car

https://www.youtube.com/watch?time_c...&v=WOjzwU5ie-A

0-60 in 7.2 seconds, Im sure he can shave of a whole second there if he took it all the wait to red line and with a better launch , maybe even more, but I highly doubt he would shave 2 seconds since he was pretty much at red line there, plus he has a lighter car than yours

FBO 328 with shorter gearing and perfect launch , right tires, perfect weather , maybe 5.5 - 5.4 being generous.


Post a video of your 5.2 with a view of the road , it will be a record on this forum , not even the ESS supercharger videos floating around have gone close to that. I have not even seen a single video of a 330 doing less than 5.8 so far.

[Biginboca]

Rick,

What do you think a stock 2006 MT 330i did 0-60 in?

Maybe your car is just slow? You think with headers, BPC tune, MILVs, 3.73 diff (+15% torque), and intake mods my car will not make 30 more hp/torque than a 330?

FYI here’s my mods:

AFE Ram Scoops
K&N Drop In
Charcoal Delete
Rev Motoring Silicone
3 stage intake
MIlVs
BPC Tune
AA Headers
3.73 Differential
275/35 Rear Tires on 23lb wheels (not super light but lighter than stock so worth mentioning)

My car is sub 3200lbs base coupe with manual vinyl sport seats, no nav, very light options.

Edit: I’ll have to film a 0-60 video. The only video I have handy is this one I actually filmed today which shows 60-80 in about 3.1 seconds in 3rd gear. So that makes my 0-80 like 8.5ish seconds adding a 2-3 shift. I know you won’t believe that either even though it is about 1/2 second slower than a e46m3 from 0-80 and that car has like 40 more hp.

Second Edit:

I watched your video and that car is taking more than 3.5 seconds to go from 60-80 so it’s definitly slower than mine and there’s no shifts from 60-80 that’s why I’ve been using it as a benchmark for my mod comparisons (before/afters) on my car. I’ve found timing a 60-80 pull in 3rd gear full throttle will tell me exactly if a mod was effective on my car or not.

[rick100]

Ok post the video. Make sure u show the road first

My car is slow just like every other car running fbo that i have seen on youtube. Just like the 328s running ESS supercharger that have posted videos here. Just like the e90 330 videos floating around or just like the video op who is running the same mods as you with a lighter car posted

i actually want you to prove me wrong, this will mean fbo 328 is as fast as stock 335 without any force induction. Win win situation here lol

[Biginboca]

Originally Posted by rick100

Ok post the video. Make sure u show the road first

My car is slow just like every other car running fbo that i have seen on youtube. Just like the 328s running ESS supercharger that have posted videos here. Just like the e90 330 videos floating around or just like the video op who is running the same mods as you with a lighter car posted

i actually want you to prove me wrong, this will mean fbo 328 is as fast as stock 335 without any force induction. Win win situation here lol

I’m very confident my car is in the ballpark of a stock manual 335. I’ve never raced one but I have raced a few other cars way out of my leage and held my own. I’ll get a video I’m just not sure how I’ll hold the phone while I’m driving and shifting. I’m open to suggestions lol

[rick100]

smart phone should fit inside the steering wheel ( the gap between the top of the airbag and steering wheel .if you keep the wheel straight it should not fall out , or you can hold it there temporarily with one hand ( should be easy enough ) , just accelerate straight

make sure you post a video of the road first to see if it is somewhat flat and not going down hill , as this is going to be the first comment from everyone if you actually get 5.2 , 0 to 60 .

I ll be surprise if you actually get less than 5.5 , but I hope you do , really , too many videos out there , none of them even come close to 5.5 . even with ESS supercharger install

[Biginboca]

Originally Posted by rick100

smart phone should fit inside the steering wheel ( the gap between the top of the airbag and steering wheel .if you keep the wheel straight it should not fall out , or you can hold it there temporarily with one hand ( should be easy enough ) , just accelerate straight

make sure you post a video of the road first to see if it is somewhat flat and not going down hill , as this is going to be the first comment from everyone if you actually get 5.2 , 0 to 60 .

I ll be surprise if you actually get less than 5.5 , but I hope you do , really , too many videos out there , none of them even come close to 5.5 . even with ESS supercharger install

Ok this should be fun, lol. Work has me away from my car tomorrow but I hope to have a video Thursday. For better or worse I’ll post it! Also I’m in Florida we don’t have hills anyone who’s ever been here can testify to that. The best you get is a slight tailwind.

[Biginboca]

Rick,

There’s some explaining to do. Check this out and look at the rpms:



Your video on top mine on the bottom. Same speed 80mph something up with the gearing in that slow car. Maybe it’s an automatic? Whether it is or not the comparison isn’t apples to apples for sure.

[rick100]

Just post your 0 to 60 . No point in comparing with other cars as you are not going to find a video of a single n52 doing 0 to 60 in 5.2 seconds. Not even close to that

We are talking about a fbo n52 without any force induction on par with a 335 ...

This may be the most interetring video in a long time. Much better than any dyno sheet out there

U may become a legend. Make sure u show the road first

[Biginboca]

Originally Posted by rick100

Just post your 0 to 60 . No point in comparing with other cars as you are not going to find a video of a single n52 doing 0 to 60 in 5.2 seconds. Not even close to that

We are talking about a fbo n52 without any force induction on par with a 335 ...

This may be the most interetring video in a long time. Much better than any dyno sheet out there

U may become a legend. Make sure u show the road first

I’m not interested in becoming a legend. I’ll show the road and it is what it is. The math works out I don’t see what the big deal is. You seem to be the only person who doesn’t think a 3200lb car with approx 300hp can do 0-60 in under 5.5 seconds. There’s a bunch of cars meeting those specs and doing it. You know that right?

And btw getting this thread back on topic. With all the mods I did the diff swap made the biggest felt change. Which makes sense because it in essence added 15% (30ft/lbs) of torque on my stock set up. And if you are putting out more than 200ft/lbs at the motor then the diff swap makes an even bigger effective change in torque. It multipies by 15% every torque change before it in the driveline.

In my case let’s say I estimate my motor is making around 240tq with the mods I’ve done (and it could be as high as 260tq we don’t really know). Add the 15% to it (15% of 240 is 36tq) and it’s putting out power like a stock diff that received an input of 276ft/lbs. That is an effective increase (with motor mods) of 76ft/lbs over a stock motor on a stock diff. (If my motor is making 260tq, which is entirely possible, then doing the same math I’m 99ft/lbs over stock torque at a total of what would be the same as 299ft/lbs input into a stock diff.)

The bottom line is... You will feel the 3.73 diff mod, and everyone who has done it has agreed with that.

[rick100]

If u already clock ur car at 5.2. 0 to 60.

Im not sure why you keep mentioning math and your calculations. I thought u were posting a vid thursday

Do u have a dyno sheet? Maybe....

Anyways if you dont want to post a video anymore just say it. This going back and forth its getting weird

I do want to believe its possible really.

[Biginboca]

Originally Posted by rick100

If u already clock ur car at 5.2. 0 to 60.

Im not sure why you keep mentioning math and your calculations. I thought u were posting a vid thursday

Do u have a dyno sheet? Maybe....

Anyways if you dont want to post a video anymore just say it. This going back and forth its getting weird

I do want to believe its possible really.

I already said I would post the video.

I noticed you said you didn’t do the diff mod and therefor you are underestimating the importance of the final drive ratio in acceleration. It’s a huge force multiplier and I wanted to point that out.

Also this is a diff mod thread lol

[For3]

Going to try to steer this back to the diff swap discussion before I fully veer it off course.

Biginboca,

This is really encouraging regarding your anecdotal / subjective feedback on swapping the diff. I picked up a 3.73 AT diff from a local used parts shop in January and just need to get new seals and fluid in before I attempt the swap. Looking forward to the results. Your sentiments echo everything else I have read on here and 1addicts.

Off topic - I too have a manual e92 m sport with manual seats but idrive and a sunroof. I haven’t weighed my car but based on google I would think it weighs somewhere around 3350. I have swapped wheels for 219M wheels and saved about 3lbs per corner and got the Performance exhaust which should save around 15lbs. What did you do to get down to 3200lbs?

[Biginboca]

Originally Posted by For3

Going to try to steer this back to the diff swap discussion before I fully veer it off course.

Biginboca,

This is really encouraging regarding your anecdotal / subjective feedback on swapping the diff. I picked up a 3.73 AT diff from a local used parts shop in January and just need to get new seals and fluid in before I attempt the swap. Looking forward to the results. Your sentiments echo everything else I have read on here and 1addicts.

Off topic - I too have a manual e92 m sport with manual seats but idrive and a sunroof. I haven’t weighed my car but based on google I would think it weighs somewhere around 3350. I have swapped wheels for 219M wheels and saved about 3lbs per corner and got the Performance exhaust which should save around 15lbs. What did you do to get down to 3200lbs?

I haven’t done anything to cut weight. I still have back seats, etc. The only mod I have done that shed some noticeable weight was switching to lighter wheels and non run flat tires which shed maybe 50lbs of rotating mass. I got my weight estimate from this video of a like optioned car to mine.

This is not my video but it’s a similar car to mine except mine has sunroof for +75lbs but I also have lighter wheels -10lbs and AA headers -10lbs (?). I assume the car in the video is like me and also not using runflats.

[Noir]

Originally Posted by rick100

I find hard to believe you can clock 5.2 without some type of force induction or going down hill somehow

I dunno, G...
I have a euro box/afe dry, REV Boot, headers & full custom exhaust, Alpha N from BPC ... I run through 1st gear (to 40 & the "new" redline that Bob made happen while on the dyno) in what seemed like 4 ish maybe more seconds. With my 3.15 final drive... I dont totally doubt that big is achieving that time. (MILVs install hopefully next week...) I definitely need to hop on the highway tonight/tmrw morning with my stopwatch on my phone. And I can give an accurate number for me... Like everyone else, Im sure, 1st gear is gone as quickly as it came (on a MT anyways, never driven the AT version).