Turbocharging Problems - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 05-12-2005, 01:01 AM
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I would like to know what extra changes I need to do to my engine when I install a turbo or supercharger.
I know that the injectors need to be changed. And the ECU needs to be reprogrammed.
But I also heard that the pistons for turbo benzin engines are different, they have some enhanced oil cooling system which keeps them from fast wearing out.
So my questions are the following

1. what resource will have my engine after turbo/supercharging.
2. what additional changes are needed/recomended for the car(engine) to function normally (last long).
3. haw mach PSI is enaugh to have a sporty car, but for everyday driving.
4. would apprishiate some links on this issue.

thanx
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#2 (permalink) Old 05-12-2005, 10:32 AM
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Quote:
Originally posted by Vahan@May 11 2005, 10:01 PM
I would like to know what extra changes I need to do to my engine when I install a turbo or supercharger.
I know that the injectors need to be changed. And the ECU needs to be reprogrammed.
But I also heard that the pistons for turbo benzin engines are different, they have some enhanced oil cooling system which keeps them from fast wearing out.
So my questions are the following

1. what resource will have my engine after turbo/supercharging.
2. what additional changes are needed/recomended for the car(engine) to function normally (last long).
3. haw mach PSI is enaugh to have a sporty car, but for everyday driving.
4. would apprishiate some links on this issue.

thanx
[snapback]343594[/snapback]

1.i dont understand the question
2.depends on boost.. when turboing make sure your oiling system is in good working order, replace your oil pan gasket, and oil pump.. fuel pump.. forged pistons help alot, and a fresh headgasket/head bolts to handle the boost well..
3. well, in pure terms of mathmatics.. 7psi will net you roughly a 50% increase in power.. but due to it not being a perfect world with perfect transitions you should be able to expect about a 40% increase at 7psi or about 238BHP from a m20b25 (325i)

also keep in mind that PSI is relative to sizing of the intercooling pipes you use and the turbo you use.. depending on the diameter and the turbo itself 7psi in 2" diameter system is NOT the same airflow ammount as 7psi in a 3" intercooling system. its overall airflow you are worrying about, not psi.. even though psi is the easiest thing to calculate/display so its what most people go by.

4. http://www.google.com/search?hl=en&q=e30+turbo+project

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#3 (permalink) Old 05-12-2005, 12:34 PM
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when you run your turbo thru intercooler yes oil is still important but not as important as if you had a oil cooled turbo plus more power with intercooler also hey nukeduster is your car turbo are your setting it up for it???? if it is 2 questions for you vids????? or pics????


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#4 (permalink) Old 05-12-2005, 01:09 PM
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Quote:
Originally posted by guywithblack88e30@May 12 2005, 09:34 AM
when you run your turbo thru intercooler yes oil is still important but not as important as if you had a oil cooled turbo plus more power with intercooler also hey nukeduster is your car turbo are your setting it up for it???? if it is 2 questions for you vids????? or pics????
[snapback]343717[/snapback]

its all been test-fitted etc, and i have all the parts, just modifying the header at the moment to better fit the head so it doesnt burn up the exhaust gaskets.

ill take pics of all the pieces layed out to get an idea of all the pieces involved in the system and how much you'll hate yourself developing your own turbo system because its fun but the biggest PITA you'll ever face if you are on a budget.

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#5 (permalink) Old 05-12-2005, 01:30 PM
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and to give you an idea of what all is involved in purchasing:

UPRATED BRAKE SYSTEM before anything else.

turbo
headers
custom exhaust system
19, 24 or 36# injectors depending on goals (stock is 15 on the i) im aiming for 270BHP and using 24# off a '93 cobra
oil couplings to tap into the oil pan, to adapt from the stock oil cooler fittings into a fitting you can actually use (m22 x1.5 = 1/2"npt or something similar)
oil lines
oil cooler
intercooler
intercooler piping
high temp silicon tubing to connect intercooler piping joints
cone filter
low-temp spark plugs (to avoid pre-ignition)
a way to modify the valve cover to include some sort of PCV so you dont blow out oil everywhere/have your dipstick fly out and hit the ceiling
a low pressure/variable pressure/rising rate FPR
uprated clutch to handle the increased torque (or a tranny oil cooler if you are using an auto)
BOV
header heat wrap (a definate must have)
boost gauge
oil pressure gauge
oil temp gauge
EGT gauge (not necessary but helpful in tuning safely)
A/FR gauge (not necessary but helpful in tuning safely)
*goes crosseyed*

and THEN there are mods which arent essential but I did anyways:

8mm irelend engineering spark wires
MSD high spark ignition coil (45k volts)
removal of mechanical fan / replaced with low profile high torque electrical fan
new oil pump
new main/rod bearings
head head gasket/bolts
new rod bolts(big one if you really plan on hitting it.. rod bolts fail before the actual rod does)

i'm sure i'll think of more later when i get around to actually looking at parts.


oh yea, i used 2" intercooler piping (for faster boost) and a 2 1/4" downpipe off the turbo which opens up into a 3" cat / exhaust (downpipe off a 524td, but also creates the smallest ammount of backpressure which is a *good* thing)

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#6 (permalink) Old 05-17-2005, 01:11 PM
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No one seems to think about comp ratio? Itīs one of the most importent things when turbocharging an engine. If Iīm not misstaken, the ratio is 10:1 for the m20b25? A guarantee to either blow the headgasket and /or get yourself a cracked cylinderhead:-(.
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#7 (permalink) Old 05-17-2005, 02:26 PM
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Quote:
Originally posted by Hotblack@May 17 2005, 12:11 PM
No one seems to think about comp ratio? Itīs one of the most importent things when turbocharging an engine. If Iīm not misstaken, the ratio is 10:1 for the m20b25? A guarantee to either blow the headgasket and /or get yourself a cracked cylinderhead:-(.
[snapback]345264[/snapback]

the b25 compression ratio is 8.8, which is more than fine. keeps things from feeling dead off boost. 10:1 isn't too high either, unless you want to run 22psi on pump gas. there are plenty of street vehicles running 10:1 and higher as well as being boosted
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#8 (permalink) Old 05-17-2005, 02:36 PM
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all of bmw's factory motors that have been turbo that i know of used 7.5:1. However there are manu's out there that are turboing 10 and 11:1 motors(volks/audi, for one, off the top of my head). Granted they arent running high boost, but a rule of thumb is nearly any motor that is worth owning can handle 6-8psi with stock internals.

and i'll take pics of my system today once i get home.

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#9 (permalink) Old 05-18-2005, 07:33 PM
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Quote:
Originally posted by nukeduster@May 17 2005, 11:36 AM
all of bmw's factory motors that have been turbo that i know of used 7.5:1. However there are manu's out there that are turboing 10 and 11:1 motors(volks/audi, for one, off the top of my head). Granted they arent running high boost, but a rule of thumb is nearly any motor that is worth owning can handle 6-8psi with stock internals.

and i'll take pics of my system today once i get home.
[snapback]345285[/snapback]
okay, here are the pics. i lost my cameras charger and im waiting for a new one to get "special ordered" *grumble* so i used my dads camera, which, as im finding out.. sucks!

this isnt the whole whole system, because i didnt feel like finding all the pieces, and because some of the parts of the system are already on the vehicle.


ill get better pics when my camera is back up and running, by given how long they ar etaking getting the charger it might be on the car by then =P





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#10 (permalink) Old 05-19-2005, 07:16 PM
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Quote:
Originally posted by guywithblack88e30@May 12 2005, 01:34 PM
when you run your turbo thru intercooler yes oil is still important but not as important as if you had a oil cooled turbo plus more power with intercooler also hey nukeduster is your car turbo are your setting it up for it???? if it is 2 questions for you vids????? or pics????
[snapback]343717[/snapback]

the inter-cooler has nothing to do with the turbo, all it does is further cool the air before it goes into the engine. 95% of all turbos are oil-cooled, otherwise the bearings would lock up.

comp. ratio does matter, especially if you want to run more than like 8psi. If the ratio is too high the gas will ignite too early and ping, i would suggest having some low comp. pistons made for the overall good of the engine
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