4G15 tuning and related info

venum · Posted: Mon Mar 06, 2006 10:15 pm Post subject:

^^^ don't think bout it too much

I had considered it, but it isn't worth it

now mind you, I am not saying that it is impossible

it's been done time and time again

but the implications of doing it are too much $$$

the average boost that can be obtained ~ 8 psi

give and take a little too

the ECU gonna have to live off a piggyback

the stock injectors would not be of too much use either

lets not forget about the pistons and the rings

spark plugs gonna need an upgrade, but thaz like the easiest part of teh turbo proj

then you have to consider fuel mods - fuel pump (prob external)

the stock ignition would suffice

but the reliabilty of the engine then decreases significantly

not even mention a tranny\gerabox to take that power

F4A41 just not gonna hold out too long

and

leave it as N/A

a turbo on this baby would definately be a nice project, but the practicality of it would be almost nil - as yuh gonna kill a great daily driver

venum · Posted: Fri Mar 10, 2006 12:31 pm Post subject:

^^^ thanx Dave, for your take on it in that PM

I will be doing some more investigating

need to talk to meh mechanic and consult some other resources along with Dave

will inform when I have more info

Dave · Posted: Fri Mar 10, 2006 2:12 pm Post subject:

would love to see it done and check me, i would help u put it together Wink

venum · Posted: Fri Mar 10, 2006 11:26 pm Post subject:

Question:

Do all turbo engines need a turbo timer?

what exactly is it's purpose?

cuz stock turbos do not have them

blazing · Posted: Sat Mar 11, 2006 1:00 am Post subject:

turbo timers leave the engine running while you go about your business. it cools the oil and extends the life of the turbo. it is not necessary but recomended.
the alternative is to just leave your car idling for 3 mins or so after a long/hard drive.

kerron01 · Posted: Sat Mar 11, 2006 2:25 am Post subject:

true^^^

venum · Posted: Sat Mar 11, 2006 10:44 pm Post subject:

[quote="blazing"]turbo timers leave the engine running while you go about your business. it cools the oil and extends the life of the turbo. it is not necessary but recomended.
the alternative is to just leave your car idling for 3 mins or so after a long/hard drive.

venum · Posted: Thu Mar 16, 2006 3:44 pm Post subject:

Some of my research to date:

Exhaust manifold - have it made or modify one to take the Turbocharger - need options of a manifold here

swap the throttle body for a bigger bore Throttle body - not absolutely necessary, but a larger TB would produce a better result

Stock intake manifold can work back

swap the fuel injectors for higher volume injectors - No two ways bout this.
need figures, I do not know what is the specs of the stock injectors either.

Change pistons and piston rings - need pistons that can better take the power. Forged piston is the best for higher boost and durability. To reduce teh compression ratio, use higher thickness gasket.

Valves - stock will work

Oil for engine and turbocharger - research inconclusive yet

Increase the diameter of the downpipe and install a free flow exhaust muffler to accomodate an increase in exhaust flow

Engine head - Dave suggests that the DOHC would be weak and might crack - need some options here

ECU - dave suggests that the stock would work, other research indicated a SAFC or E-Manage for better fuel management

Intercooler - FMIC is better suited due to the ease of installation and fit due to engine bay design than a TMIC

Turbocharger - size inconclusive to date

Boost Gauge - not investigated yet

O2 sensor - not investigated yet

also need to consider the down time of the car

what about parts availability?

RA40-GTE · Posted: Thu Mar 16, 2006 3:58 pm Post subject:

Dave · Posted: Thu Mar 16, 2006 4:05 pm Post subject:

oh gosh man, u want a w2j build
just get some fuel control via a SAFC and a manifold, turbo and a small intercooler and enjoy yourself
you could just lower the compression in the head and even that is not totally necessary

once u get a turbo, you can make the manifold from there
i would figure once u have all items and its just a matter if installation then around 2days max

Rudman · Posted: Thu Mar 16, 2006 4:09 pm Post subject:

Let me save U some work here. A decent Autometer boost guage (20 psi) and an A/F guage with a mounting A pillar pod will set U back $1000 at least.

Man gorne clear yes..........he turboing the 4G15...... Shocked

Aye pallie, U not running automatic with that setup right? I ent see U factoring a manual gearbox, competition clutch, clutch and brake pedals, cutting the firewall, etc, etc........

All this is additional downtime for the car. And prepare for the myraid of unforseen small parts U go have to be running down. U have a ride to work man?

RA40-GTE · Posted: Thu Mar 16, 2006 4:11 pm Post subject:

dave, a question...
how much boost can the engine take safely on stock internals and intercooler?

Dave · Posted: Thu Mar 16, 2006 4:17 pm Post subject:

on the sohc carbed 4g15 in the c62 i put 9lbs max and then the water pump gave
the newer ones were not as strong as the older ones, the castings were weaker esp the ports between the head and were known for cracking even with normal use

RA40-GTE · Posted: Thu Mar 16, 2006 4:20 pm Post subject:

^^gracias senor..
i have more questions , but tomorrow for that.. Laughing

Dave · Posted: Thu Mar 16, 2006 4:24 pm Post subject:

no probs meng Wink

Mitsu power · Posted: Thu Mar 16, 2006 4:26 pm Post subject:

there is aftermartket high flow intake manifold that comes down with these engines saw a couple of them on startlet engines as well. its mandral bent aluminum pipes that is connected to a collector that the T/B is attached to if you could get one it may greatly help your results.

venum · Posted: Thu Mar 16, 2006 7:15 pm Post subject:

blazing · Posted: Thu Mar 16, 2006 8:07 pm Post subject:

venum · Posted: Thu Mar 16, 2006 8:49 pm Post subject:

^^^ thanx man

thaz more than a mouthful

since yuh say not to ask no more questions bout that, I won't

bit I will ask this

average $$$ - hit meh a figure Mr. Green

blazing · Posted: Thu Mar 16, 2006 9:11 pm Post subject:

well it depends, but the basics are something like this:

ECU- E-manage and harnesses 2800 or SAFC - ??
Turbo - used 600-1200, new 1600 ++++
Manifold- flange and welding - 100
injectors - stock type 300+ - RC 1700 or so
SMIC - 300 - 600
gauges - at least 2- 600-1200
fuel pump - walbro - 900 / eclipse 400
RRFPR - 1000-1500
BOV - eclipse 300/ greddy 600 +
Air filter - 350 +
check valves for MAP- under 100
T-bolts and silicone couplers - 500
Gaskets, oil lines, colant lines, bolts and other misc things - 500+
Exhaust and intercooler piping - who you know
Proper Tuning - priceless

optional:
Throttle body - 500 to 800
catch can - 500+

then theres brakes and suspension to see about Exclamation