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E34 (1989 - 1995)

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  #1  
Old 07-25-2014, 05:43 PM
91_535_igor 91_535_igor is offline
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Supercharging a 535i pros and cons

I have a 91 535i it is all stock minus a k&n cold air. It has 163000 miles on it. I'm looking for various ways to get more hp and torque and I want to supercharge but want to know the pros and cons beforehand


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  #2  
Old 07-25-2014, 10:09 PM
Alpina535I Alpina535I is offline
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Be prepared to empty your wallet on SUPERCHARGING. Go turbo gives you better bang for your buck. Try chipping and running a wideband air/fuel meter I run the LC-1 with Dinan chip and it runs great.

Alpina
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  #3  
Old 07-25-2014, 10:33 PM
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1995i540 1995i540 is offline
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Originally Posted by Alpina535I View Post
Be prepared to empty your wallet on SUPERCHARGING. Go turbo gives you better bang for your buck. Try chipping and running a wideband air/fuel meter I run the LC-1 with Dinan chip and it runs great.

Alpina


The best bang for the buck are applications that are most common for the engine. Supercharging will save you A LOT of money if you are talking about M60 engines.

Eitherway, if you are asking what is better for your car. I think turbo kits are pretty common for it.

That would be your biggest pro and should be your decision maker. In my opinion, anyways.
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  #4  
Old 07-25-2014, 11:39 PM
TexHun TexHun is offline
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Originally Posted by 1995i540 View Post


The best bang for the buck are applications that are most common for the engine. Supercharging will save you A LOT of money if you are talking about M60 engines.

Eitherway, if you are asking what is better for your car. I think turbo kits are pretty common for it.

That would be your biggest pro and should be your decision maker. In my opinion, anyways.
Well said! Turbos should be the only type of F.I. on a straight six engine. If you get a proper kit and tune you could very easily hit the 450HP mark. Turbo kits for these engines are also dirt cheap compared to a supercharger.
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  #5  
Old 07-26-2014, 06:37 AM
91_535_igor 91_535_igor is offline
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Okay but are there any down sides to putting a turbo in with how high of miles? And what kit would you suggest?


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  #6  
Old 07-26-2014, 09:10 AM
MySatinDoll MySatinDoll is offline
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For a m30 there are very few downsides. The two most common are turbo lag and fuel economy.
But lag can be over come through proper turbo sizing.
And no one turbos a m30 to save at the pump.
The other downside is really a matter of opinion.
It has been documented to be considered as old tech.
Truthfully it is. But this has not swayed people one bit in pursuing a turbocharged m30.
It didn't sway me. And it hasn't swayed anyone on mye28.com.

A m30 requires zero internal work unless your rwhp is high or your engine is beat.
This is different from the more praised m5x/s5x builds which are often recommended to
have some type of work done to compensate for the positive pressure.
This is mostly due to the m30's compression ratio is lower.

M30s are easy to build and can be done under 5k.
The most expensive items (unless you find a e23 745 kit) will be the turbo, exhaust manifold, and exhaust.

Funnything. I'm sellingmy m30 turbo kit minus the manifold and downpipe.

Edited:
Most would jump in and ask "well what about tuning or engine management?"
"How about fuel management do I need a aftermarket pump?"

The answer to both is unless you're shooting for high rwhp. 300rwhp can be got
With nothing more than stock fuel pump, some type of boost control wastegate, blowoff/ diverter valve and rrfpr to compensate for the need for more fuel.
This is documented fact not internet hearsay.

Chips and standalone DMEs are necessary when your goal exceeds 300rwhp.

Also word of caution. There are plenty of ebay kits out there. Avoid them.
The intercooler kits are fine. But ebay knockoff turbos and manifolds stay away.
TCD and RSD make the best manifold outside a 745 manifold.
The most rare are alpina biturbo manifolds and 666 fab manifolds.
They also carry a heavy cost for that reason.
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Last edited by MySatinDoll; 07-26-2014 at 01:35 PM.
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  #7  
Old 07-26-2014, 10:47 AM
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1995i540 1995i540 is offline
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Okay but are there any down sides to putting a turbo in with how high of miles? And what kit would you suggest?


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If you are asking this, you can't afford a turbo. The cost of getting the new M30 engine block in should not be the decision maker for you.

Be prepared to spend money on old components that will begin to fail under FI conditions.
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  #8  
Old 07-26-2014, 11:06 AM
91_535_igor 91_535_igor is offline
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New to cars man. Just asking questions. So I'll need to get a new engine block and what all else?


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  #9  
Old 07-26-2014, 12:06 PM
MySatinDoll MySatinDoll is offline
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Originally Posted by 91_535_igor View Post
New to cars man. Just asking questions. So I'll need to get a new engine block and what all else?


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No you don't.

if the engine is in good condition miles don't dictate what should or should not be done.

But he does make a good point. If you have no clue on the condition of the engine.
FI should be the last thing you consider.
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- Christopher Walken "The Lion Speech"
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  #10  
Old 07-26-2014, 02:01 PM
MySatinDoll MySatinDoll is offline
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OP since your set on boosting it let's talk about the very first thing.
As well as state for the record I'm not expert on FI.
Truthfully very few are. We all speak from experience or from research.
I've been building mine for a few years. Mostly due to events occurring or wanting to further my research of my potential build.
So I can guide you on what to do. However I'm not gospel on the subject.
I'm adding to the thread from my experience.

The first question to ask yourself is what is the purpose of your build?
Are you going to drag, drift, or other forms of racing with it?
Is it just a daily which you want more power?

Second question relates to the first. What is your RWHP Goal?
Meaning what are you shooting for? 300,400,500, maybe 600+?
This is important for you have to understand what will go into building it to reach that goal.
Next is the condition of the car.

Again I say it (for the 2 millionth time...) Maintenance before Performance.
This has and always will kill the projection time of a build.
For with more power you'll need other things. Engine health is first on the list.
If your engine isn't up to snuf you'll grenade it easy.
Drivetrain and Braking are the other crucial aspects.
For you have to be able to transfer the power to the wheels as well as stop the car.

This is the point I think Alex was getting at.

Lastly and possibly the most important. You have to have a budget.
My build in total was 5k.
That's from a new head to the components, hardware, and engine management needed to make it work.

My goal was a reliable, street usable, 350-400 @ 10-12 PSI.
I bargain hunted for most of the items (used) and bought new what I could.
When my car was totaled I was in line for a turbo manifold and down pipe
which would have put me in 6k range easy.

All said, Research, make a goal, perform maintenance, upgrade what you can
Create a budget, and go for it.

Regardless if it's old tech or not a boosted m30 is a force to be reckoned with.
Yes there are more powerful builds using different bmw engine platforms.
but the m30 feel is raw and most who go this route aren't disappointed.

Cheers
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Every once in a while the Lion has to show the Jackals who he is...
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