High mileage rebuild - 4g63 stroker questions (3)

[Praeses]

Hi,

Here's some background information first:

I currently have a 4g63 w/210,000mi on it. It has already been rebuilt once however its approaching its time once again. Currently one of the cylinders is only holding 150psi.

Anyways, since this car is going to continue being my daily driver as well as my weekend car for quite some time, I have tossed the idea of simply upgrading the turbo as that'ld only expediate the engine's timely death. I am hoping for 300+ hp in the end off of 91 octane and am hoping to achieve that off the stock turbo. So far, I have been looking into the stroker kits available, notably those recommended through the forum posts on this site. I am leaning towards:

http://www.slowboyracing.com/more.php?id=2006&mods=21-5375,28-5378,32-5381

I will be getting a local shop here to bore it out, and performing the rest myself as I would be fairly comfortable with that. It seems mostly like some straight forward grinding and everything else typical for a rebuild. I am planning on replacing all the seals and both belts at the same time, otherwise leaving everything intact. I am hoping to snag one rather annoying broken manifold bolt off at the same time, but that shouldn't have any impact on the rest.

Almost everything in my car is stock/replacement stock parts. Some of the "free" mods have been performed already.

Including the rebuild, and new paint (not doing it myself) I am budgeting ~ 5500 over the cours of this year.

Now for the questions:

1) I am hoping for another 100,000 mi on this car after this rebuild(3-4yrs). Assuming I never go over 20psi on the turbo when I replace the current one, can I expect this with that kit, and the 0.030" bore? or should I drop down to 0.20" bore. I'ld sooner get a little more than just have her honed out. I typically shift maximum ~ 6600 on the track currently, daily driving usually < 3k except for passing of course.

2) As this will be my first fuel-injected rebuild(did not perform the first rebuild) how will the stock injection/ecu handle the increased displacement? Usually with a carb its a decent amount of finicky work. I currently do not have DSMLink or any equilvalents however I am planning on going that route in the near future (possibly before rebuild so I can familiarize myself with it).

3) I am hoping for ~ 13-14 second car in the end (which . Right now I'm mid 15s but she's not running 100% either. Does it seem like I'm on the right track?

 

[bushy]

What's the compression on the other 3 cylinders? On a 1g 150psi is not low.

I believe the service limit on a 1g is 124 psi or a 14 psi difference between two cylinders.


Also, 13 seconds on a 14b (stock 1g turbo) is very doable with a healthy running engine and turbo.


I also do not believe there will be a problem with the increased displacement since the ECU reads airflow from the MAF which is then calculated into how much fuel is to be injected.

 

[Praeses]

Wonderful to hear about the MAF so long as it holds true come re-assembly day.

Altho 150 may not be low now, it will be lower of course in 6+months... I'm trying to plan ahead and avoid any catastrophies.

Currently the readouts for all the cylinders are 166, 150, 161, 170.

I thought the last one was somewhat odd as I thought these were 164psi stock? I could be mistaken. I just checked today, and they're holding true to that.

 

[Syndicate]

Im sorry not sure if I read correctly , You are going todo a 2.3 with a 14b? ..

 

[Praeses]

Yes.

 

[Syndicate]

You will need a 16g turbo ( Which will be outflowed eventually around 5000rpm - I toasted my 16g on the 2.3 ) , the 14b will become fried from the 2.3 . Most people reccomend 20g + Unfortunately then there are issues of having to get injectors , fuel control , intake/exhaust , cooling , and the list just goes right on down the line.

You should read a little bit more about the 2.3 before you even consider it . ( And look at what people reccomend for turbo's , I do not recall someone have a 2.3 with a 14b and the turbo not turning into magma )

 

[Praeses]

Thanks for the reply.

Unfortunately that seems like it will push my engine rebuild back further. I would prefer to work on one thing at a time so looks like I will have to try to get as much life as possible from this engine as is.

I'll be going back to the drawing board trying to figure out what's best in the end, I'll probably end up going with the same engine build, but I was delaying replacing the turbo until I can do the manifold, and exhaust at the same time. Going through the records it appears as this turbo has only 45,000mi on it, so I'll probably replace it and the exhaust (also, only 45,000 on it) just before rebuilding the engine.

The plus side, it'll be much easier for me to shell out the small bits(<$500) here and there for the fuel system upgrades than the rebuild itself. Planning on picking up a boost controller and guage tomorrow, or possibly just ordering it (Canada, so it'll take a week or so) Then look into the fuel pump and injectors next. Hopefully I can find the parts I need to make the mmcd link in my old college boxes.

In the meantime, sleep, been reading as much as I can (generally don't absorb it too well however) since I got this car, and pretty much 14hrs of today. I won't be surprised if I spurt out some ill-conceived versioin of DSM jargon to fellow employees tomorrow.

Employee - "Hey the printer's jammed again"
Me - "Must be crankwalk"
Employee - *Puzzled look*

Thanks again, I'll be continously scouring these forms until the big day comes.