boosted new 420a long block

[dsmupcomer]

So i am looking into buying a 420a long block with no added modifications on it. secondly i am looking into buying a t3/t4 turbo set up for the new long block... how much psi do you think i can run comfortably on this new block? Im looking at some crower stage 2 turbo cams.. all NGK Bkr-6 spark plugs and wires... and my list isnt complete but want to see what i can do comfortably.

 

[Nicklepage1010]

What are you planning on using to tune this bad larry?
I dont think there is enough information to give you an accurate estimate on how much "PSI" you can push through the block.
Start with 5.

 

[dsmupcomer]

i hear alot about megasquirt but wondering whats good for a decent price... ### from looking it up i see they are not cheap. Im looking to want to push about 8 psi altogether.. what would be fair modifications to hold 8 psi.. yeah i got a heavy foot and like to go fast but im fair with treating my vehicles good.. i got 200,500 miles on my 420a that im looking to replace.

another quick question... if i push only 8 psi do i really have to desperately need to upgrade my computer?

 

[boostkrazy26]

Are you going to upgrade the engine's internals? Regardless of the amount of boost you will need to have some kind of standalone system for a piggyback for the ecu. Im running a apexi neo on mine. Without it the car would cut out at times and felt like it was holding back. What kind of compression are you planning on running?

 

[grothe3297venge]

If your going the distance of buying a new block, why not spend that money on forged internals so your not gonna have to do this again. To me I would do it once and do it right. Turbo'ing a 420a on a budget is just insanity in itself, and personally I would get all your parts together (forged pistons, rods, and etc) before you do anything.

200,000 miles I would more so worry about maintenance, motor mounts, and all related suspension. Also don't wast your time and money on a SAFC.. Just go MS and be done with it, yet another reason to just get everything together and then start installs all at once.

Also turbo'ing a stock 420a is NEVER going to be comfortable.. Just wasn't meant to handle boost reliably. I mean it has been done, but why not do it correctly once, and then enjoy reliability and comfort. Just my .02 cents.

 

[Miasma]

As krazy said you need some sort of piggyback or new ecu to manage the boost. That being said I would recommend buying the megasquirt ems, it's the best for your money and you will be satisfied.

Are you buying a stock longblock? Whats your compression. OEM pistons in a 420a can handle 10psi max!! Anymore than that the block will require some upgrading as well as your fuel system. Make sure to get a fuel pressure regulator as well, or you will most likely burn rich.

 

[boostkrazy26]

Im running 10psi on my 420a eclipse most of the time and sometimes up to 18psi when I want to get serious. This was only possible with a low compression set up and a good ecu piggyback. The megasquirt is alot better. I started out with the apexi neo and went with a megasquirt later and it has its rewards in terms of performance and tuning. So i recommend upgrading the engine internals and a Centerforce Dual Friction Clutch to hold the extra power with ease.

 

[dsmupcomer]

Im only planning on running 7-8 psi on this stock long block.. all stock internals.. I may just possibly keep the stock crankshaft and conecting rods but push the compression to about 10:1 or 11:1. Im really not looking for a serious amount of power as to where i live theres nowhere to really do 140 -150 mph..

Now my question is.... would it be cheaper budget wise to just not buy the long block and just build up the original block with forged crankshaft, conecting rods, 10:1 compression pistons, arp head studs and a set of crower 2 cams with pt cruiser rockers and valve springs and new valves? is that possible for around 1900$? Im new to this turbo'ing stuff and i DO make sure i do it right. Im looking at megasquirt for tuning but honestly is there a way with only pushing 8psi i would NOT need a tuning device?

 

[boostkrazy26]

Im only planning on running 7-8 psi on this stock long block.. all stock internals.. I may just possibly keep the stock crankshaft and conecting rods but push the compression to about 10:1 or 11:1. Im really not looking for a serious amount of power as to where i live theres nowhere to really do 140 -150 mph..

Now my question is.... would it be cheaper budget wise to just not buy the long block and just build up the original block with forged crankshaft, conecting rods, 10:1 compression pistons, arp head studs and a set of crower 2 cams with pt cruiser rockers and valve springs and new valves? is that possible for around 1900$? Im new to this turbo'ing stuff and i DO make sure i do it right. Im looking at megasquirt for tuning but honestly is there a way with only pushing 8psi i would NOT need a tuning device?

From a personal experience i tried running low boost on a stock block with all stock internals and it didnt last long. As far as a tuning device goes your going to have problems and your car is going to run pretty awful. Problems i had when first starting out is the car would cut out when idling and driving, car would die out at random times and somtimes hard to start afterwards. so if you want to go turbo even to just run it mellow i suggest the internals being upgraded regardless and a tuning device. you can try your idea but id rather not have you waste money on a past mistake i made and ran into more money than what it wouldve cost the first time if i had done the necessary upgrades.

 

[grothe3297venge]

Im only planning on running 7-8 psi on this stock long block.. all stock internals.. I may just possibly keep the stock crankshaft and conecting rods but push the compression to about 10:1 or 11:1. Im really not looking for a serious amount of power as to where i live theres nowhere to really do 140 -150 mph..

Now my question is.... would it be cheaper budget wise to just not buy the long block and just build up the original block with forged crankshaft, conecting rods, 10:1 compression pistons, arp head studs and a set of crower 2 cams with pt cruiser rockers and valve springs and new valves? is that possible for around 1900$? Im new to this turbo'ing stuff and i DO make sure i do it right. Im looking at megasquirt for tuning but honestly is there a way with only pushing 8psi i would NOT need a tuning device?

Why in the world would you UP the compression..? You need to lower it if anything, especially if your not going MS. It's not about power anymore obviously because you need to make the thing run and be reliable since its your DD (assuming it is). Seriously, 1900$ I would put toward mostly maintenance since it has 200,000 miles, and your car will probably need it (head, block, suspension, and etc). Things wear out over time.

As for the 8psi with no tuning solution, why would you spend all that money, and not have a way to run it all safely?? It's like you want to do it KNOWINGLY with knowing the risks without it. Doesn't really make sense to me. And keeping the stock rods with aftermarket pistons.. it's not helping you any. The rods are the most weakest link in the 420a (even tho there's many more!).

I don't know what more I can tell you other then I think your making a mistake. Yes it's been done on 8-10 psi, FMU, and so on with a stock block. It varies between people but why waste money instead of doing it right the first time. And why are you aiming for such high compression?!? All motor, hell yeah go for it, boost..your asking for detonation and a new motor fast.

From a personal experience i tried running low boost on a stock block with all stock internals and it didnt last long. As far as a tuning device goes your going to have problems and your car is going to run pretty awful. Problems i had when first starting out is the car would cut out when idling and driving, car would die out at random times and somtimes hard to start afterwards. so if you want to go turbo even to just run it mellow i suggest the internals being upgraded regardless and a tuning device. you can try your idea but id rather not have you waste money on a past mistake i made and ran into more money than what it wouldve cost the first time if i had done the necessary upgrades.

^^^^^ couldn't agree more with this guy..

 

[boostkrazy26]

if you dont want to spend much cash in tuning and parts another alternative would be to just get a gst or gsx instead. alot cheaper in the long run parts and tuning wise and no problem with running mellow boost. only downer to that is depending on insurance you might pay a higher amount for insurance being that a gst and gsx both are considered sports cars. with the $1900 budget and maybe sellin what you got that would be another idea you might want to consider