12psi 420a?

[Jeff99GS]

So I just Turbo'd my 99 420a eclipse about a month ago, and so far so good! The car runs great and feels great too! I have been running 8psi.
I was just wondering if anyone has first hand experience with what will happen to the stock internals on or more than 8psi? What is the first to go on the engine, the rod bearings? Rings?

I am planning to rebuild the motor, but I figured I'll let this one go bad first. But I just want to know what to look for? I'm guessing knocking and low compression? does anyone have any tips?

Can anyone tell me what a bad compression reading on the stock 420a is?

 

[XMasta19]

That's probably not a good idea...I would know


The stock internals aren't necessarily weak, just don't do too well when people overboost on stock injectors and weak fuel management etc. fyi...I cracked piston ring lands

 

[VelocitàPaola]

Wait... you're going to destroy this engine first, then rebuild it? Why not just rebuild a spare block, and sell your old block to someone who needs a stock replacement? Maybe that way, you can offset the cost of the rebuild a little.

 

[cs82685]

That's probably not a good idea...I would know


The stock internals aren't necessarily weak, just don't do too well when people overboost on stock injectors and weak fuel management etc. fyi...I cracked piston ring lands

Seems the pistons are the weak spot. I believe it usually ends in a spun bearing or cracked piston rang land. The rods can handle a bit more power than the pistons, I believe there have been a few people to use them up to 12-13 psi w/forged pistons.

But yeah i'd say if you wanna blow the bottom end in the car then have a fully built one waiting to go in, unless of course you have a second car and don't mind down time

I will tell you 12psi feels good though. My WG started to leak and I spiked 12 psi on stock injectors on one pull, fortunately nothing happened as it was only boosting that much for a couple seconds max.

 

[Jeff99GS]

Wait... you're going to destroy this engine first, then rebuild it? Why not just rebuild a spare block, and sell your old block to someone who needs a stock replacement? Maybe that way, you can offset the cost of the rebuild a little.

Thats a good idea, But i'm kinda low on cash right now. I'm not trying to destroy my engine, I just wondered if anyone ever took this block to a higher level on stock internals.

What psi are you guys running?

 

[VelocitàPaola]

8psi on a built bottem end. I'm waiting for better fuel management means to boost higher.

 

[cs82685]

Thats a good idea, But i'm kinda low on cash right now. I'm not trying to destroy my engine, I just wondered if anyone ever took this block to a higher level on stock internals.

What psi are you guys running?

6-8psi stock bottom end. If you're on a tight budget, then I definetly wouldn't push more than 8psi

oh and I definetly wouldn't push more than 8psi on stock injectors, even at 8psi my car starts to lean out and EGT's creep up too much that's why I'm at 6-7 now, I gotta get my 30#'ers in

 

[97eclipsesleepr]

on a stock block ehh not a good idea, ied say max with proper fuel and tuneing ied say 8-10psi would be the max a sive heard. i run 10psi on my motor with 550s,vortech sfmu,safc,ect ect and im liking it so far. but on stock injectors and whatnot ied keep her at 6psi IMO.

 

[XMasta19]

meh....fully built bottom end, megasquirt completely untuned, 15-17psi because I still can't figure out my damn boost controller z, plus the gas up here is only 90 octane, so it's xylene or race gas for me every weekend.

 

[4UH8ERS]

What is the first to go on the engine, the rod bearings? Rings? :

ring lands.

I am planning to rebuild the motor, but I figured I'll let this one go bad first. But I just want to know what to look for? I'm guessing knocking and low compression? does anyone have any tips? :

tips i got one. dont let that motor go bad in anyway 1st. Keep it for spare parts or an extra block or sell it and make money off it.


if you want more than 8psi then you want more fuel. once you supply more fuel and are not running lean sure you can turn it up a little to 10-12psi, but don't be suprised when a piston takes a crap on you.

 

[Blitzeclips]

8psi on a built bottem end. I'm waiting for better fuel management means to boost higher.

Ditto.

Anything past 8 psi on a stock bottom end, and you're just asking for it.

 

[Jeff99GS]

Ditto.

Anything past 8 psi on a stock bottom end, and you're just asking for it.

Well then I'm in trouble...I just put a new 38mm wastegate on my car and for some reason I can't get it to got any less than 10psi...So I just haven't been hitting WOT and keeping below 8psi. I gotta get that fixed, so far I checked all my hoses and lines. I have my boost controller ran right off the compressor outlet too. Can you guys think of any reason it would be staying at 10psi? No matter how high or low I turn the boost controller it just stays at 10psi..

 

[VelocitàPaola]

Um... 10psi spring in the wastegate?

 

[cs82685]

Um... 10psi spring in the wastegate?

I'd second that. Remove the MBC and see what you boost at just to rule that out. If it's still 10psi then either you bought a wg that leaks or one with a 10psi spring.

oh and I know it's tempting to not do it, but if it is your spring, then I would remove it so the engine sees no boost until you have the correct spring installed.

 

[XMasta19]

Yeah, first things first...take off the boost controller, you don't even need it

 

[Jeff99GS]

Okay so when I take off the Boost controller. how should I hook up the wastegate? should I run my boost source hose off the turbo into the side port of the wastegate? or just leave it open? The only reason I dodn't think it was a 10psi spring is because it won't go above 10 psi either... no matter how high i turn up the MBC.

 

[VelocitàPaola]

D'oh.

Make sure vac lines are like this...

You must be logged in to view this image or video.

 

[Jeff99GS]

Well my boost controller looks a little diffrent...(See pic) How do I hook up that kind? and what is that little valve TEE thing?

 

[VelocitàPaola]

Oh... you have one of those. That's a Turbosmart knockoff in-cabin bleeder-type MBC. It's funny how well they reproduced it:
http://www.turbosmart.com.au/index.php?id=43

Anyway, here's how to set it up:

 

[BigRand]

Paul, has your reputation gone so high that they just gave you a set of stars now, I looked to give you rep points for the diagrams and well I can't anymore.

Where do you get these digrams from, or what program do you use? (sorry for the off topic post)

 

[VelocitàPaola]

Haha. They did away with the rep point system for Mods/Wisemen. I didn't follow the complaint threads, so I couldn't tell you why...

I made a few diagrams a while ago using MS paint. Since then, I just modified the base diagrams to suit whatever question I needed to answer. I've been getting better with AutoCAD, so you may see some more complicated diagrams in the future. For now, though, I think the simplicity of MS paint diagrams helps keep everything clear and easy to understand.

 

[4UH8ERS]

Paul, has your reputation gone so high that they just gave you a set of stars now, I looked to give you rep points for the diagrams and well I can't anymore.

You mean they didnt tell you? The reason they got rid of his rep option is becuase they decided that all his rep points should go to me. so just click mine and let the compliments begin!

 

[Jeff99GS]

Wow thanx for the info, I have had it hooked up wrong all along. So the Knob goes in the car??? and the side that is open, Do I need to run a hose off the nipple or can you just leave the nipple open?

So is that a crappy MBC?

 

[VelocitàPaola]

So the Knob goes in the car???

Yep.

and the side that is open, Do I need to run a hose off the nipple or can you just leave the nipple open?

You're supposed to route a hose from it to somewhere outside of the cabin. I guess you could keep it open though. Everytime you build boost, air will rush out of it though.

So is that a crappy MBC?

Besides the fact that it's a knockoff, all of those long vac lines can delay wastegate response time. Furthermore, due to the nature of its operation (bleeding off boost), it can actually supress full turbo spool until later in the RPM range.

 

[Jeff99GS]

What kind of boost controller do you recomend? Is there a non manual type?