lets talk natrually aspirated

[Exhaust power]

you can flash your stock ECU. no need for an evo ecu.

really? I was under the impression that it wasnt flashable. Dont know where i got it from but ill do some digging.

[SPD_FRK]

you can flash your stock ECU. no need for an evo ecu.

You can flash the Galant ECU with the 2.0 cable, regardless of 99-03 model years. Though the Galant ECU is flashable, and some will likely use it, it still is a "band-aid" solution once you are 5pd swapped IMHO.

If you want it done properly, 4cyl should simply swap directly to an Evo ECU since it has the Knock Sensor, where as the Galant and Eclipse ECU does not.

The V6 platform simply just swaps over to the Eclipse M/T ECU.

The reason I say to swap to an Evo (4cyl) or Eclipse (V6) Ecu is simply because you have about 30+ wires that are not needed in the harness once you are swapped to the 5spd. Just leaving the bundle of wires, or running a dual ECU setup, or intermediate harness are all what I personally view as a "band-aid" solution...like it or not, it is the truth when it comes down to it.

Doing the wiring and swapping over to the full ECU is pretty easy that I am confident in most of the people here that they can do it themselves...considering what many have been able to do already.

[mysticj]

Running a more aggressive intake cam then exhaust? whats the benefit? And i believe ill need new springs to match the 272.

More overlap..G4JS springs sux...Must upgrade.

[Exhaust power]

More overlap..G4JS springs sux...Must upgrade.

More over lap isnt necessarily good in a N/A engine but could work. The basic purpose of over lap is when the exhaust opens up 1st then the intake opens up 2ND while the exhaust is still open. Thus getting most of all the bad combusted air/fuel mixture out. this will help bring a greater % of clean air in when combustion happens.

now we have a more aggressive intake . In theory now i think of it the torque curve at max torque will probably stay the same and in the higher rpms torque should be better then a 264 intake. Do to the fact that even if the intake opens early into the exhaust stage(4 cycle) the exhaust is still closing on time. And when in high rpms(max hp) the cylinders dont fill up with air as much at max torque. Now with a more aggressive intake cam the intake will open a bit early and at high rpms fill the cylinder with more air before compression happens. thus making more torque since horse power is a function of torque itll make more horse power as well.

so in theory the benifit would be like advancing a regular 264 intake with out shortening the power band.

Now when you throw in other things as compression ratio running a cam too big might hinder performance. And one other thing who knows how my car would idle with that 272 cam? around a 900 rpm idle is favorable for me. Ill stick with 264/264 for now and down the road if needed power experimental like the 272 cam could be explored. If thats what your going to run i wanna see some numbers! sorry for the speach just giving out info

[mysticj]

I'll let you know the results of the 272/264 in a few months...

[Exhaust power]

went on you tube to see some 272/264 set ups and they sound pretty sick and idle about stock. Ill just need to see dyno numbers.

[duh2150]

You can flash the Galant ECU with the 2.0 cable, regardless of 99-03 model years. Though the Galant ECU is flashable, and some will likely use it, it still is a "band-aid" solution once you are 5pd swapped IMHO.

the 99 and 00 models are now flashable? did they finally update it? I tried to do mine a while back and it wouldn't work

[Isaurio]

Last time I checked only the 02-03 are the only years. Maybe I'm wrong.

[Rach3T8G]

Last time I checked only the 02-03 are the only years. Maybe I'm wrong.

thats what i thought too i ddnt know 99-01 ECUs were flashable

[qnz]

you need the tactrix 2.0 cable for the older models

[SPD_FRK]

Thought the information of flashing the older ECUs was posted over here already, guess not.

you need the tactrix 2.0 cable for the older models

As he said, though you will need the appropriate definition file for the ROM files yet which is being worked on.

[deeznutz]

Whitch cable do you need for 01-05 ecm

[duh2150]

yeah i have the 2.0 cable they must have updated it if it works now

[Exhaust power]

I guess todays my day to start my build, i just got G4JS pistons. Im still not sure if i want to do the DOHC head swap. So im sticking to the SOHC theory for now.

For the 2nd time i been in turbo car and i must say ill be more then happy to be 180-220 whp N/A lol
my friend has a turbo 2nd gen neon running 10 psi on a small diesel turbo(oxymoron) and it halls. but the thing i found cool was he was doing tunes on the run. Seeing the potential of tuning on the run seems very exciting and satisfying.

[mko]

Get 7g replacement pistons, they have deep dish and will clear any valves. They have 9.5:1 CR

SOHC sucks donkey balls

[Exhaust power]

Get 7g replacement pistons, they have deep dish and will clear any valves. They have 9.5:1 CR

SOHC sucks donkey balls

9.5:1 is kinda of low for N/A and i already got the sonata pistons. Im not worried about clearance i read on 3g forums one guy had the pistons in with no problems. SOHC just seems more straight forward and cheaper in the short run.
and as i said before the 4g69(rpw.com) put down some decent numbers with bolt ons 4g64 shouldn't be too far behind.

btw are you talking about the 7g DOHC pistons? i have no idea where the ratio will be go (up or down) with the G4JS head and 7g pistons.

[mko]

7g SOHC and DOHC pistons are identical. The difference is in the head chamber. 7g SOHC has 9.5 CR and the DOHC has 10.0 CR. Replacing the head with hyundai 1.8L head with smaller chamber brings it up to 10.7-11 CR. BUt thats for 7g.

So for 8g in theory, you already have the Sonata 2.4L pistons, and between the 3 choices you have - Kia, Sonata and Evo8 heads, you need the one with the smallest combustion chamber that will bring up the compression.

What is the stock Sonata compression with DOHC head - 10 -10.5:1? This compression will change once you use these pistons with SOHC Galant head, and that change will most likely be in the negative i.e will bring the compression down i.e youll end up with the same setup you have now with stock Galant piston CR.

[Exhaust power]

7g SOHC and DOHC pistons are identical. The difference is in the head chamber. 7g SOHC has 9.5 CR and the DOHC has 10.0 CR. Replacing the head with hyundai 1.8L head with smaller chamber brings it up to 10.7-11 CR. BUt thats for 7g.

So for 8g in theory, you already have the Sonata 2.4L pistons, and between the 3 choices you have - Kia, Sonata and Evo8 heads, you need the one with the smallest combustion chamber that will bring up the compression.

What is the stock Sonata compression with DOHC head - 10 -10.5:1? This compression will change once you use these pistons with SOHC Galant head, and that change will most likely be in the negative i.e will bring the compression down i.e youll end up with the same setup you have now with stock Galant piston CR.

ok i see what your saying with 7g heads.

The G4JS DOHC engine is 10.0:1 and the 8g sohc is 9.0:1. The sonata pistons are higher compression because they sit a bit higher. I cant remember the cylinder head cc's but the hyundai head is bigger. Using the sonata pistons with the sohc will yield around 10.5-11.0:1 CR.

Im sure some body has to know the exact ratio since alot of us do the DOHC swap for turbo builds.

[mko]

IDK man it makes no sense.

Pistons at TDC sit flush with the block. Higher sitting piston or offset wrist pin piston is used only for stroker builds.

If the Sonata pistons are higher sitting then they will most def. come in contact with the head which is obviously not good.

If the statement, that 99-00 Galants have 9.5 CR and the 01-03 galants have 9.0 CR, only leads me to say that early 8g galants were still using 7g style 9.5 CR pistons and later 8g were made with flat pistons and 9.0 CR.

Do you know for sure that the SOnata has bigger combustion chamber than the 8g SOHC chamber? Because if the Galant has more cc's in the chamber then youll end up where you started - stock CR galant. And then youd have to make a choice - go DOHC for more compression or get another set of pistons.

I wish my theory is wrong and youre right. That will save you a lot of headache.

[mrg7243]

I know my 00 galant pistons are flat top pistons, i think all of them are 9.0 cr