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Old 11-20-2013, 11:45 PM   #1
connorfitz
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What next for my car?

Ok, so i am new to the car forms as i recently just purchased an 04 330ci ZHP in white. First i'll start with what the previous owner had done to the car.

Stainless steel headers
UUC clutch and short shifter
Cold air intake
3.38 differential vs. 3.07
Active Autowerke software upgrade
DeCatted
Also slotted and drilled rotters (pretty sure he said they were made by ECS)

Thats what he had straight from the listing, so my question is: What should i do next for power and torque or just anything to increase performance. I dont really want to go much lower because of where i live there are a lot of speed bumps and its my daily driver.

Also i am looking at VMR CSL rep rims and am curious on if i should get 18's or 19's.

Lastly I was wondering if anybody knew the brightest bi-xeon lights for the e46 face lift.

Sorry if this stuff has been posted a lot, but its getting close to the holidays and i would like to get a good start on it by december.

Thanks, Connor
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Old 11-20-2013, 11:48 PM   #2
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Connor.

Maintain your car.

Also put back the stock "rotters"

And take off that "cold air intake" for it is crap.

See all the links in my sig. They will help new members like you.

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Old 11-20-2013, 11:50 PM   #3
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Connor.

Maintain your car.

Also put back the stock "rotters"

And take off that "cold air intake" for it is crap.

See all the links in my sig. They will help new members like you.

GL!
thanks for the advise but why put on the stock rotters?
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Old 11-20-2013, 11:59 PM   #4
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thanks for the advise but why put on the stock rotters?
because they perform better and aren't cheese graters for your pads.
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Old 11-21-2013, 12:01 AM   #5
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330 zhp's are pretty we'll maxed out in terms of performance from factory unless you go forced Induction. However there are little things you can do for weight reduction and freeing up power. Easiest thing to do would be to remove your spare tire and jack. It's about 35lbs and free to remove. Just pick up one of those fix-a-flat cans in case you do get a flat. Another thing you could do is pulleys which will give you a few ponies if your looking for power. In terms of handling and braking I would look into stainless steel brake lines for that stiffer pedal feel, and a set of thicker sway bars such as Hotchkis or Turner.


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Old 11-21-2013, 12:02 AM   #6
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I second the suggestion to get rid of the cold air intake.

And if you must replace the most beautiful alloy BMW ever designed, go with 18's.
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Old 11-21-2013, 12:02 AM   #7
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330 zhp's are pretty we'll maxed out in terms of performance from factory unless you go forced Induction. However there are little things you can do for weight reduction and freeing up power. Easiest thing to do would be to remove your spare tire and jack. It's about 35lbs and free to remove. Just pick up one of those fix-a-flat cans in case you do get a flat. Another thing you could do is pulleys which will give you a few ponies if your looking for power. In terms of handling and braking I would look into stainless steel brake lines for that stiffer pedal feel, and a set of thicker sway bars such as Hotchkis or Turner.


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get crazy stiff springs and get rid of the sway bars all together. that's probably 50 pounds at least.
seriously.
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Old 11-21-2013, 12:04 AM   #8
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I second the suggestion to get rid of the cold air intake.

And if you must replace the most beautiful alloy BMW ever designed, go with 18's.
this is the most beautiful allow they've designed. bmw really set ground when they made this wheel
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Old 11-21-2013, 12:05 AM   #9
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get crazy stiff springs and get rid of the sway bars all together. that's probably 50 pounds at least.
seriously.
I can't tell if that was a chirp or not...


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Old 11-21-2013, 12:08 AM   #10
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get crazy stiff springs and get rid of the sway bars all together. that's probably 50 pounds at least.
seriously.
No thanks. I actually prefer installing a set of sway bars on a vehicle as opposed to installing lowering springs. Sure, the springs give a car a nice appearance, but I felt a huge gain when I installed sways on my 330i. I think sway bars do much more for handling then a set of springs, granted everything else in the suspension has been replaced/maintained. Installing incredibly stiff springs will probably be more of a detriment to the handling capability of a car than an improvement if they're too stiff and ruin the roadholding ability of the car. Of course the same can be said for sways that are way too stiff. I know it's not particularly relevant but I haven plans to lower my S4. I'm going to new dampers and sway bars and calling it a day.
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Old 11-21-2013, 12:22 AM   #11
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I can't tell if that was a chirp or not...


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...what?

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No thanks. I actually prefer installing a set of sway bars on a vehicle as opposed to installing lowering springs. Sure, the springs give a car a nice appearance, but I felt a huge gain when I installed sways on my 330i. I think sway bars do much more for handling then a set of springs, granted everything else in the suspension has been replaced/maintained. Installing incredibly stiff springs will probably be more of a detriment to the handling capability of a car than an improvement if they're too stiff and ruin the roadholding ability of the car. Of course the same can be said for sways that are way too stiff. I know it's not particularly relevant but I haven plans to lower my S4. I'm going to new dampers and sway bars and calling it a day.

i would never do this on a DD. but let me put it this way. a car achieving x amount of body roll at b amount of g's with only springs will handle better than a car achieving the same amount of body roll at the same amount of g's with a combination of springs and sway bars.

in other words, a car with a truly independent suspension (no sways) will always handle better, given that the spring rates are increased (stiffer) to compensate for it.

appearance aside of course. i didn't mention ride height as it doesn't really matter. springs rates are what actually matter.
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Old 11-21-2013, 12:31 AM   #12
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...what?




i would never do this on a DD. but let me put it this way. a car achieving x amount of body roll at b amount of g's with only springs will handle better than a car achieving the same amount of body roll at the same amount of g's with a combination of springs and sway bars.

in other words, a car with a truly independent suspension (no sways) will always handle better, given that the spring rates are increased (stiffer) to compensate for it.

appearance aside of course. i didn't mention ride height as it doesn't really matter. springs rates are what actually matter.
Considering his first post was I don't want to go any lower, I think we can both agree that lowering the car was kind of out of the question. Hence my comment about sway bars, which will reduce body roll, and for daily spirited driving seems like a pretty good solution to me. If they were pointless I don't believe BMW would have put them on the car in the first place. Now to your comment about ride height really not mattering, if you lower your car, you reduce the cars center of gravity by x amount. This is the same as lifting your truck. There is a reason that all trucks have a sign on the sun shade that says high rollover risk. So now that this topic has gotten way off track and I think we are really kind of arguing the same point can we just give this guy some useful advice.


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Old 11-21-2013, 12:38 AM   #13
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Considering his first post was I don't want to go any lower, I think we can both agree that lowering the car was kind of out of the question. Hence my comment about sway bars, which will reduce body roll, and for daily spirited driving seems like a pretty good solution to me. If they were pointless I don't believe BMW would have put them on the car in the first place. Now to your comment about ride height really not mattering, if you lower your car, you reduce the cars center of gravity by x amount. This is the same as lifting your truck. There is a reason that all trucks have a sign on the sun shade that says high rollover risk. So now that this topic has gotten way off track and I think we are really kind of arguing the same point can we just give this guy some useful advice.


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i didn't say sway bars were useless. i just said that a car without them, and stiffer springs to compensate, will handle better. obviously a car like that would not be a nice car to drive on the street.

anyway......
reducing weight is going to be the name of the game for the OP because there's not really much more power to be had unless you put in $$$$. there's not really much you can do but every pound technically counts.
wiper res. wipers. a/c accessories. rear seats. rear deck (interior). trunk mat. trunk fabric lining. foor mats. carpet. rear seats. sound deadening in trunk and under rear seat. power steering. fog lights. pass mirror. sunroof. speakers. lighter wheels. lighter tires. window motors. spare tire and tools.

i know some of that is extreme but there's really not much else you can do at this point to give you a noticeable boost.
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Old 11-21-2013, 12:38 AM   #14
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The sway bars I installed on my 330i made it handle so well I became overconfident and wrecked it.
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Old 11-21-2013, 12:40 AM   #15
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The sway bars I installed on my 330i made it handle so well I became overconfident and wrecked it.
maybe you didn't have them set correctly. the adjustments on them actually control the in turn characteristics of the car. it will make the car oversteer or understeer. i actually didn't believe it until i got mine and tried it. definitely makes the rear whip around. with my square setup i have pretty much no understeer now. which can be dangerous.
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Old 11-21-2013, 12:42 AM   #16
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So with headers and no cats ... no emissions test in Washington I guess?
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Old 11-21-2013, 12:46 AM   #17
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maybe you didn't have them set correctly. the adjustments on them actually control the in turn characteristics of the car. it will make the car oversteer or understeer. i actually didn't believe it until i got mine and tried it. definitely makes the rear whip around. with my square setup i have pretty much no understeer now. which can be dangerous.
I played around with the adjustment on the front bar a bit before my car met it's end. I ran it on the softer setting for DDing and stiffer for autox. Even when set at the softest setting, the car handled so well that it would overpower the rear tires and kick the rear end out before you could even feel the rear tires start letting go. There was no gray area, the car was either glued to the ground, or in a full spinning rotation. I was blown away after the first autocross I took it to after installing the sway bars. I also had a square set of 4 rear M68 wheels with 255 star specs mounted on them...it was incredible while it lasted.
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Old 11-21-2013, 12:58 AM   #18
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I wouldn't really try and get extra power out of the engine, BMW already did that with the ZHPs, new cams raised redline, couple other things. The suspension is also tuned pretty well too on a ZHP, you should be happy with how it feels and if not chances are things just need to be refreshed with new parts. Drove one ONCE for a couple minutes and it is a great car. Congrats!

I concur with removing the cold air intake, the stock intake already pulls pretty cold air and no use in dealing with oiled filters or worrying about getting water up in there and other CAI related woes. I also concur with Peyton, everything he's said about springs vs sway bars goes along with what I've been taught by autox and track day enthusiasts in my local club. It all makes sense too. Bigger rear bar can lead to more oversteer and the break-away point can be abrupt and unexpected if you don't dial things in right. Some may like this but I really enjoy how the tail comes out with the stock sport suspension.

I think I saw a post on here where Mango drove a ZHP and noted his well maintained normal 330 felt faster, if that's some motivation to keep up on the preventative maintenance as a top priority.


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Old 11-21-2013, 12:59 AM   #19
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thank you all for the input. I did forget to mention he added a front sway bar but i'll look into a rear and do you guys know of anything i could do to increase power or torque aside from boosting. Just a ballpark answer how much do you guys think i could gain from a new catback, cold air intake and throttle body?

Thanks
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Old 11-21-2013, 01:20 AM   #20
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If you have just an aftermarket front one I'm blown away that it doesn't understeer like crazy. As for your question maybe 10whp... keyword maybe. Just as compcrasher86 had stated, BMW did a stunning job with the 330ci zhp and it is pretty tapped out for performance. You got an amazing machine so just enjoy it how it is! While you may not be the fastest car on the road, it is still a pretty quick car that is quite well engineered.
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