suggestions for reaching 20psi

[ECLIPSE10358]

I have a 1992 eagle talon N/A turbo, its running stock boost. I am getting ready to pull the engine to install a timing belt and clutch, i am also planning on putting in some new stock turbo pistons arp head studs and cometic head gasket, my question is what else should i put on while i have the engine out, are my n/a cams enough for this or should they be upgraded, i dont want to waste my money but i need the car to be reliable for the most part. I know my fuel system will need to be upgraded but i can do that after the engine is done. thank you for any feedback.

 

[92AWDHX40]

Cams are fine but you may want to upgrade all depends 20 psi get some mods too, wideband, a stock block can go a long way. Na turbo also, check the upgrade path, and do some more reading research you dont need much.

 

[brane_97talon]

1.Stock n/a block = stock turbo block minus oil squirters and higher compression ratio pistons. If they are 6 bolt, ill take em off your hands

2. The n/a cams actually have a more aggressive lobe duration so you're good there.

3. What Engine management do you have?

 

[Marc91GSX]

My suggestion would be to stick with OEM composite HG, it's cheaper and more than reliable enough for 20 psi. The money you will save in machining cost and the head gasket should be enough to get you a set of larger injectors which would be more beneficial to you than a MLS head gasket on an essentially stock bottom end.

Just my .02c

HG #MD183808 is the OEM part number for the HG.

 

[e85_4g63]

Why are you specifically after "20 psi"? What turbo is on your car?

 

[brane_97talon]

^+1 I asked what engine management is the OP running because 20lbs on a 14b is alot different from 20lbs on a 16g in term of cfm or the amount of airflow generated by said turboz.

Ive logged 28lbs/min out of a 14b at 18psi of boost on my completely stock 92 talon before timing became dangerously retarded. Ha.

 

[toppertopper]

I just went threw this on mine ,Stick with oem head gasket ,do your water pump while you are there (i didn't the 1st time and payed for it) bolts stretched and blew out the gasket ..do the oil port mod while the head is off ..Leave the cams , apr head studs ..Once you do that and crank up the boost get ready to do a clutch , if you are still using the nt trans like me go with the most aggressive clutch ..I went threw an act 2600 a centerforce dual friction like butter ..I just picked up an act 6 puck unsprung race disk if it doesn't hold i am doing somthing wrong

 

[thomcasey]

2g maf, 550's, wally 255, afpr, e316g, boost gauge, fmic. Welcome to a very reliable 23psi boost. Running that for almost 2 years now. No issues

 

[1996Eclipse420a]

^^ what this guy said. I actually just finished my build 2 days ago... I didn't do the oil port mod he said above..You'll need a good set of Rods/Pistons of course, ARP Headstuds, same cams are fine... Make sure you get a good set of bearings too. I prefer ACL.

Here's my list:

-Cometic MLS
-ARP Headstuds
-Stock Cams
-Stock Head (just had a valve job, grind valves, cleaned em, and re seated them)
-Resurfaced Head
-JE Pistons .020 overbore
-Eagle Rods
-OEM Main Bolts (They're actually really strong and can take a beating)
-ACL Main/Rod Bearings



That's pretty much what you'll need. The MLS is your choice though, from my experience most 420a's come with MLS HG on them, but if you go with Composite then you'll be fine.


Also, I had crank work done, balancing, grinding, turning, etc... but I'm pretty sure you know to have this done.

 

[Marc91GSX]

^^ what this guy said. I actually just finished my build 2 days ago... I didn't do the oil port mod he said above..You'll need a good set of Rods/Pistons of course, ARP Headstuds, same cams are fine... Make sure you get a good set of bearings too. I prefer ACL.

Here's my list:

-Cometic MLS
-ARP Headstuds
-Stock Cams
-Stock Head (just had a valve job, grind valves, cleaned em, and re seated them)
-Resurfaced Head
-JE Pistons .020 overbore
-Eagle Rods
-OEM Main Bolts (They're actually really strong and can take a beating)
-ACL Main/Rod Bearings



That's pretty much what you'll need. The MLS is your choice though, from my experience most 420a's come with MLS HG on them, but if you go with Composite then you'll be fine.


Also, I had crank work done, balancing, grinding, turning, etc... but I'm pretty sure you know to have this done.

The engine in question, I am assuming based on his mod list, is a 4g63 N/T out of a 1g. All of the things you are suggesting for him to do are serious overkill for that engine. With stock pistons/compression ratio out of a turbo motor, he will have no problem handling 20psi from a 16g (his current turbo) mechanically. The amount of money it would cost him to do all of the things you are suggesting could possibly exceed his budget to the point where he can't afford proper tuning which is by far more important for his goals than building an engine capable of handling 500+hp.

 

[ECLIPSE10358]

I would like to daily drive this car in the spring and 20 psi seemed like a cheap goal. I am replacing the waterpump with the timing belt, i have heard that NA pistons will break at the ring lands under higher boost levels, that was my reasion for replacing them the car has 138,xxx miles and i figure this car hasent had a easy life. I was the one that finished the turbo swap so until now this car has never seen boost, i also heard that without a cometic headgasket it has a great risk of blowing out at 20psi. and i currently have no engine management. i do plan on a getting a wideband 02 but what else would be a good idea for little money, i went with stage 2 comp clutch,

I forgot to put that the turbo is a 14b i believe, tdo5h

 

[Marc91GSX]

I would like to daily drive this car in the spring and 20 psi seemed like a cheap goal. I am replacing the waterpump with the timing belt, i have heard that NA pistons will break at the ring lands under higher boost levels, that was my reasion for replacing them the car has 138,xxx miles and i figure this car hasent had a easy life. I was the one that finished the turbo swap so until now this car has never seen boost, i also heard that without a cometic headgasket it has a great risk of blowing out at 20psi. and i currently have no engine management. i do plan on a getting a wideband 02 but what else would be a good idea for little money, i went with stage 2 comp clutch,

I forgot to put that the turbo is a 14b i believe, tdo5h

There are guys running over 30 psi on composite head gaskets on turbos a lot bigger than the 14b with no problem at all. If you do not have a leaky hg and your compression is good, spend your money on fuel management and tuning. 18-20 psi with a good tune should be ok with the 14b with your engine the way it is now. If the compression is a little low or you just want the piece of mind, get a set of 2g turbo pistons and through them in with a resurface and OEM hg. Trust me you will not come close to exceeding the capabilities of the OEM HG at the boost level you plan on running.

 

[ECLIPSE10358]

do you have any suggestions on a good fuel management for cheap? also are injectors necessary for my goad or can i get away with just a 225 fuel pump.

 

[clipto]

You will be fine stock with most any turbo on 20psi. All tho a 14b is rather pointless unless you like a hairdryer running on your car. Get more fuel like injectors, fuel pump and oviously a tune with ecmlink or flashable ecu or a chip. Also a 16g would be worth it for 20 psi not on a 14b.

 

[Cdc1221]

A mls gasket is a waste of money imo. Without proper surface prep they may not even hold at idle. People have made over 600 hp on a composite. Also, boost pressure is just a number. You could run 20 lbs on a poorly tuned engine with poor mod selection and not make dick for power. Get a way to tune and learn to tune it first

 

[Gerg]

do you have any suggestions on a good fuel management for cheap? also are injectors necessary for my goad or can i get away with just a 225 fuel pump.

Injectors will be necessary as well as a AFPR (aftermarket fuel pressure regulator) because the stock FPR will not handle the 255 pump. Also look into rewiring the fuel pump, it's cheap and effective to get your pump the voltage it needs.

Also installing a 2g maf you will be able to run 550cc injectors without any tuning program.

 

[Marc91GSX]

do you have any suggestions on a good fuel management for cheap? also are injectors necessary for my goad or can i get away with just a 225 fuel pump.

What are your goals with this car other than running 20psi? Do you have a HP number you want to eventually reach because boost is just a pointless number on a gauge. It tells you how much pressure the air inside the system is at, it does not tell you how much air is inside the system.

Also, I just noticed you didn't mention what ECU you are running. Did you put the turbo ECU in the car? Did you also swap out to the 450 (blue top) injectors? Did you put a stock turbo fuel pump in the car?

As far as tuning goes, here are some options:

ecmlink
My1gDSM (he's on here, I would suggest sending him a PM)
AEM FIC6
APEXi SAFC2

 

[boost97gst]

We need to ban the term "psi" and replace with lbs/min jk. But seriously, the thread title implies you want 20psi, well try throwing 20psi at it from a 6262 or hx40, then 20 from a t25. Psi doesnt really matter is what im saying. The larger the turbo the lower the psi to get to a given lb/min airflow. But bigger=more lag. Im rambling, just get your goals set out and the answers are out there as to which turbo,injectors,pump,exhaust etc you will need.

 

[ECLIPSE10358]

Yes when i bought the car all it had was the turbo installed, i replaced the maf, the injectors, and ecu with turbo ones, also installed the resistor pack and knock sensor and got the car running good i did not replace the fuel pump but am planning on replacing that with a 255. it does have a manual fpr i installed, i dont want to make alot of power with this car i just want to make it a fun daily driver, for now anyways

I have read post after post about people on here saying the NA pistons will NOT hold up to boost. my question is why is everyone on this thread telling me that it is a waste of money to replace mine with turbo pistons???