420A How much can a 420a boost with internals?

[lxeclipsegsx]

okay guys this is the deal how much can a 420a engine build boost? some guy told me you could only boost to 12psi due to the block being Aluminum.

well so far i have my .40 low compress pistons 8.5.1 my eagle rods that can take to 600hp aftermarket crank and stage two cams i think is the 272lifted not sure my undriven pulley, cam gears and a rebuild kit that i got from top line.
pretty soon i'm buy my turbo kit or i'm custome it i'm thinking of going with the t3/t4 and boosting them 20pounds.
I wanted to know if i can with those new internals? if u can help me please e-mail me at [email protected] thank you

 

[VelocitàPaola]

We don't have aluminum blocks; we have cast iron blocks. If you have a large enough turbo, and can design a fuel system that can support it, you can boost upward of 30psi. This amount of boost isn't something that's extremely feasible, but it can be done with the right set up.

 

[4UH8ERS]

the block is not aluminum its cast iron and can easily handle 20psi with the correct supporting mods. the only way i see you blowing your block out is if you broke a rod and shot it through the block which i have seen before.



edit: DANG YOU velocitapawhatever! beat me too it.

 

[GSGoinFast]

As these guys have said, the block is cast iron, not aluminum. I wouldn't really worry about what it can and can't handle for boost, something else will break before that.

On a side note, don't use the polls like that, the polls are for getting people's opinions, your answers didn't even relate to a question. And don't ask people to email you the answer, the answer should be on the thread you started so everyone can get that info if they need to later down the road.

 

[DSMcrazy3]

As stated before the block is cast iron, the head however, is aluminum. As stated before, when you replace the internals with stronger aftermarket parts, the amount of boost the motor can withstand is no longer the problem really. It's how much the fuel system can support.

 

[lxeclipsegsx]

okay what can i do to improve my fuel system for it to boost them 20psi? i'm htinking of going with the 255walbro fuel pump some 550cc fuel injectors or what should i do also is okay with those internals to boost safetly those 20pounds?

 

[GSGoinFast]

Probably going to have to aim a little higher then that with the injectors.
http://www.2gnt.com/www/corbin/example.html

 

[XMasta19]

550's will safely get you upwards of 15psi if you're actually paying attention to your duty cycles. What kind of fuel management are you looking at running because you can't just expect to throw bigger fuel pump and injectors and have the stock ecu control it all.

 

[lxeclipsegsx]

not sure yet any tips?

 

[lxeclipsegsx]

all this fuel system is very hard to understand what should i use to tune up for me to boost 20psi the proper fuel system?

 

[VelocitàPaola]

Megasquirt for the more adventurous type; Hahn Racecraft's Portfueler for a more plug and play type system.

http://www.megasquirt.info
http://www.hahnracecraft.com

 

[lxeclipsegsx]

am i gonna have to change my ECU? isnt that what the missing link do? or is it just to to let ## car knwo the turbo is there?

 

[VelocitàPaola]

You won't need to replace your ECU.

The missing link (ML) clamps MAP sensor output voltage so the ECU doesn't actually know you're under boost. If it did "know," it's actually cut off the fuel supply since it thinks something is going wrong.

Anyway, since it doesn't "know" you're under boost, it can't add more fuel to compensate for all of that extra air going into the engine. Because of this, you'll need some sort of fuel management to modify the fuel curve accordingly.

A common set up is a simple a 12:1 FMU, Walbro 255, and the stock injectors. This will add enough fuel while under boost up to about 8psi. If you substitute an S-FMU for the FMU and eliminate the stock fuel pressure regulator (FPR), you can boost with this system up to about 12-14psi.

You'll need electronic means of fuel regulation past that. One way is to add the Hahn PortFueler, which is basically an injection block that adds an additional set of four injectors. You basically plumb the injection block in-line after the stock fuel rail, then add a 1:1 rising rate fuel pressure regulator (eliminating the stock FPR). A pre-programmed controller box controls these injectors independent of the stock injectors.

You can also opt for a complete stand alone fuel management system, in which case you'll need to upgrade to bigger injectors, eliminate the stock FPR and add a 1:1 AFPR. After that, it's all a matter of tuning, since this stand alone system controls the injectors independent of the ECU, and knows how to add fuel according to boost.

 

[BigRand]

Okay, let me help you out.

Read every single word of all this links I'm about to give to you. Yes I know its a lot of reading, but believe us when we say you will appreciate the knowlege you gain from experienced members here. They've spent a lot of time making this board a place for "factual" information for our cars, and well that is really uncommon on online boards. So thanks guys and well...here.....

http://www.dsmtuners.com/forums/showthread.php?t=181134

http://www.2gnt.com/www/corbin/example.html

http://www.dsmtuners.com/forums/showthread.php?t=71330

http://www.dsmtuners.com/forums/showthread.php?t=221200

http://www.dsmtuners.com/forums/showthread.php?t=105569

http://www.2gnt.com/www/corbin/choosefpr.html

http://www.2gnt.com/www/corbin/chooseinj.html

http://www.2gnt.com/nuke/modules.php?name=Sections&op=viewarticle&artid=6

http://www.2gnt.com/nuke/modules.php?name=Sections&op=listarticles&secid=19

Okay that should be good for now. Like I said I know its a lot, but realize that a lot of us here, have read all of these articles and more countless of times to get a better understanding.
And well if someone told you we had an aluminum block, and like a dozen people replyed pretty quickly to make sure you knew that wasn't true. Thats what we do around here.

Anyways get real familar with that search button, and read a lot of information.

P.S. If anyone wants to point him in the direction of megasquirt main threads that would be cool.

 

[XMasta19]

As for megasquirt, you need to decide if you're dedicated enough to do the necessary tuning and tweeking that is required. If you're ready to take that step, then I honestly believe it's the best way to go You have some decisions still, but whatever you decide in the end...we'll be here to help and guide you

 

[lxeclipsegsx]

hey thanks everyone you guys have helped alot hopefully by next week i get my parts in my engine then turbo in about 2weeks from then by thank you guys again for everything

 

[Dave Chan]

just a curious off topic question... for the guys with turbo 420A, what do you usually keep your boost levels at for daily driving?

If you guys daily drive the car..

 

[GSGoinFast]

just a curious off topic question... for the guys with turbo 420A, what do you usually keep your boost levels at for daily driving?

If you guys daily drive the car..

6-8 psi everyday, depending on how much the exhaust is leaking

 

[BigRand]

I'm built, but I find I'm fast enough right around 10-12 psi.

But I'll be getting tuned for hopefully 18-20.

I'd say keep it at 15psi or lower if your built.

If your not built, 5-8psi.

 

[DSMcrazy3]

6-8 psi everyday, depending on how much the exhaust is leaking

Good stuff!

I run 5 psi daily.

 

[XMasta19]

...it depends on whether or not my car even runs...oh wait, it doesn't


I run 8psi daily, and plan on about 13psi once I get the car running and drop in my built block

 

[speedy13]

not trying to be a dick here,but do you guys actually feel 5 psi ? I know if you guys are running stock internals you gotta take it easy with the psi,But i can barely feel the boost on my gvr4 and it's bone stock and running 9-11 psi.

 

[VelocitàPaola]

not trying to be a dick here,but do you guys actually feel 5 psi ? I know if you guys are running stock internals you gotta take it easy with the psi,But i can barely feel the boost on my gvr4 and it's bone stock and running 9-11 psi.

One, yes.

Two, boost and our stock internals make for a more noticeable effect than boost and your 4G63 internals; the reason being that our cars have a high compression ratio from the factory.

 

[XMasta19]

yup yup....7-8psi + 9.6:1 cr = quite a kick in the butt

 

[BigRand]

Trust in this man, you can definately notice a big difference between no boost and 5psi (aka 50 horsepower extra being turned on).

Our cars will probably beat most stock GST's, (and even some GSX's) as our higher compresssion usually leads to more horsepower if not the same horsepower, with a lighter car mind you.

My car dyno'd at 175whp with only 5psi. Compared to no boost at 120whp.

I will admit thought that going from 6psi to 10-11psi I do feel a huge difference.

Our motors do want more boost once built though, you can feel it.