Question concerning motor build up

[fredleysir]

Hey guys, I posted this in the General/Newbie forum as it was my first post, but didn't get the response I was looking for. So I thought I'd try it here.
I'm looking to get a 91 Eclipse GSX with the following installed:
-wiseco .020 over pistons on stock (1G) rods
-lightened, knifedged crank
-clevite 77 main + rod bearings
-balancer shafts removed
-BCS restrictor removed
-silencer removed
-hacked air can
-ARP main + head studs
-MLS head gasket
-stage 3 TMO chip eprom
-stock 14b turbo (currently running 11psi)
I want to get as much power out of the 14b as I can. I realize that fuel management upgrades will be in order, but how much could this engine safely boost with stock injectors, pump, and intercooler with the above mentioned internals (remembering that the stage 3 chip eliminates fuel cut)?
I'll probably go with some 550s, 190 fuel pump, and flush out the stock intercooler. What level of boost would I then be able to safely run?
This is my daily driver, and I'd be satisfied with running 12s for an idea on my goals with the car. I'd also like to put in a dual stage boost controller in order to switch between boost levels in the cabin. Forgive me if any of my interests or questions conflict with each other, for I am new to the DSM/turbo scene. Thanks in advance.

 

[kpt4321]

Here are a few points to consider:

Every motor is limited by several things. Most motors have a general power limit, when the "weak links" start to go bad. Now, these weak links can vary, but there are certain ones on the 4G63 that tend to stand out.

The head bolts have a tendency to stretch a little bit, possibly, once you get into the high 20's in terms of boost pressure. A good set of ARP head studs will fix this issue.

Beyond this, you're really only talking about bottem end limitations. Around 500 whp is what I personally would consider to be the point where you need to think about upgrading to aftermarket rods and pistons, for reliability concerns.

This all, of course, assumes good tuning. Detonation will destroy a motor in no time, at any power level.

Thus, if you are not going to exceed either one of these limits (which you will not on a 14b) then tuning and detonation issues become your main concern. You need to consider intercooler and fuel, mainly.

With stock injectors, you have two power limits, one on pump gas and one on race gas. I can't tell you exactly what this limit will be in terms of psi, but on stock injectors with a stock intercooler I would estimate 15 psi on pump gas and low 20's on race gas.

 

[fredleysir]

OK, thanks.
The motor does already have ARP head studs as well as Wiseco .020 over pistons on 1G rods. If you see my first post, it notes some other internal upgrades as well. I'm not necessarily questioning the strength of the interals so much as the power limit the stock fuel system has, but you answered that for me. Now as far as the upgraded fuel system is concerned, if I went went with 550cc injectors and a 190 LPH fuel pump, would that be sufficient fuel to provide 12 second 1/4 mile power? Will the stock 1G fuel rail be sufficient as well? Any help is appreciated.

 

[kpt4321]

In general terms, 450's are good for 12's on race gas and 13's on pump gas. My car, as an example, went 13.2 on pump and 12.8 on race gas with 450's.

550's should be enough for 12's on both pump and race fuel.

Stock fuel rail is fine.

 

[1fast97gsx]

do the 550s and the 255 pump. Turn the boost to around 20 and make sure it's properly tuned. Once you get sick of the 14b and want more power swap out the injectors again for some 660s or so and get a larger turbo. 12s are do-able with the 14b. Good luck.

 

[thekellbeast]

So are 11's, but it will take an ass-load of work.

 

[fredleysir]

Cool, thanks guys. I knows 12s have been done with the 14b, but I'll probably eventually end up getting something bigger (probably just a big 16G). Should I use the 250 LPH standard or high pressure fuel pump?

 

[Styler91TSIAWD]

I would go with the standard. When you go to order you pump and injecotrs I would also order a datalogger and palm. what were you planning on tuning it with. This tool is invaluable. I would get you stuf ported or port it yourself. Just port match the exhasut manofld and exhaust housing. This will make a big difference and is very cheap to do. Don't mess with your intake ports.

 

[fredleysir]

I was actually considering the MAF translator, due to cost effectiveness and the fact that I could then run the GM MAF and make my BOV sound all loud and cool.
Has anyone had any bad experience with it or does it lack any necessities for running the type of set up I'm looking for?
I'll definitely make sure to port match the exhaust manifold and housing, thanks for reminding me.
I forgot to ask; will upgrading the fuel system (to 550s and a 250lph fuel pump) have any adverse effects on the stock fuel pressure regulator?

 

[dsmturboawd]

Originally posted by 1fast97gsx
Turn the boost to around 20 and make sure it's properly tuned.

dont tune around boost level, rather adjust your boost level around your tuning.

understand what im saying? i dont know why i cant say that clear.

 

[fredleysir]

I understand what you mean; have proper supporting components before turning up the boost, I take it?
So to coincide with that, will the stock fuel pressure regulator give me any problems with an upgraded fuel delivery system?