n\t internal in a turbo block?

[grdsm]

I was rebuilding my turbo motor and had a nt long block available, a good mechanic friend of mine that works on countless dsm told me to use the internal of the nt block for my rebuild since the orginal intenals were not so good. SO I used the crank and piston of the nt block with new bearings and rings in my turbo block, I am running a garret t3 turbo, fmic, exeternal wastegate. is there any issues I might have to keep in mind? the motor is a 4g63

 

[Locke]

The NT pistons are weaker than the turbo pistons, and of a higher CR. Be sure to run high octane fuel, and be very conservative with the tune.

 

[grdsm]

this is going to be my daily for now SO i HAVE to run high octane in it WHY?

 

[Locke]

Because you are going to be using weaker pistons (cannot handle detonation as well as turbo pistons may) and a higher CR (which = more heat, thus increases the likelihood of knock.)

 

[grdsm]

itbut since it is a turbo block with oil squiters shouldn't it be okay or is it recommended? what do you mean by knock?

 

[Locke]

The block and squirters won't save the weak, high CR, NT pistons (with thin ring lands) from cracking or melting.

Knock destroys engines. See Engine knocking - Wikipedia, the free encyclopedia.

Run high octane fuel if you are doing this.

 

[grdsm]

SO if I do this it will increase the potensal life of my motor oppose to running a low octane fuel.

with this set up how much boost is recommended?

 

[Locke]

Probably stock boost or lower, depending on your tune. You'd have to wait for other guys to chime in and offer their help with that.

BTW: Fill out your vehicle profile - unless it is really 100% stock.

 

[spawn7037]

I was under the impression that you always have to us 93 octane with any turbo charged cars.

 

[tkelly27]

To get the most performance out of it you do. However, the factory knows that not everyone is going to run 93 octane, especially on a car as cheap as DSM's. I can't even get 93 out here. The timing gets pulled and you loose some HP, but that's about the only thing that happens.

If you run low octane on a high compression, weak piston turbo car, you're asking for problems.

You should get some turbo pistons, that and the oil squirters are the only difference between NT and turbo 1g's.

 

[grdsm]

To get the most performance out of it you do. However, the factory knows that not everyone is going to run 93 octane, especially on a car as cheap as DSM's. I can't even get 93 out here. The timing gets pulled and you loose some HP, but that's about the only thing that happens.

If you run low octane on a high compression, weak piston turbo car, you're asking for problems.

You should get some turbo pistons, that and the oil squirters are the only difference between NT and turbo 1g's.

I don't understand what you are talking about in the begining of your post A little graamar might help
I believe the intake cam is different as well

 

[tkelly27]

I don't understand what you are talking about in the begining of your post A little graamar might help
I believe the intake cam is different as well

If we're going to nit-pick, there's not a single period in your post, "grammar", and "beginning". I was replying to the person who posted;

"I was under the impression that you always have to us 93 octane with any turbo charged cars."

Yes, the cams are different, but we're talking about the short block surviving under boost here, are we not?

Furthermore, this thread is really moot, as if you had searched, you would have found the answer
http://www.dsmtuners.com/forums/cylinder-head-short-block/270332-n-t-pistons-can-i-use-them.html

To reiterate, the pistons are weaker, and it really doesn't matter if you run 116 octane, you're not going to get the same performance out of them as turbo pistons. Just like turbo pistons break at about 500hp with zero knock, these will break at a lower hp number (I think it's 300, but don't quote me) no matter how well you tune it. Push it at your own risk.

 

[98mitsuGSX-SD]

+1 for tkelly27. Stick with OEM or better. The engine will thank you for it down the road or leave you on the side of the road. Which would you prefer?

 

[spawn7037]

So I could run regular gas in my car and be fine. I've been told it will ruin your turbo and engine.

 

[98mitsuGSX-SD]

Your able to run any octane of gas you want. They (Mitsubishi) prefer you use premium over 91 octane for knock prevention. If you can tune out the knock using 89 or even 87 octane have at it. That's the story I've heard from another thread but I'm too lazy to research it and post the link.

 

[Stainbox12]

So you are going to run N/A pistons on a turbo setup? dude, get an EGT at least. With an EGT gauge you will be able to monitor you engine's health basically. I would not run more than 5 o 6 PSI, or you will melt your pistons for sure. It also depends on what kind of turbo you got. If you have a big turbo, you might melt them even at 5 psi. This is basic mechanics. Turbo pistons are made to handle turbo applications, and N/A pistons are made to handle non turbo applications. The N/A pistons have a very high compression ratio + a turbo, you will kill your engine for sure. We are talking about here, that this pistons will get very very hot, and melt, no matter if you are rich, with forged rods, arp, etc. If you melt the pistons, you have the risk of scuffing bad the cylinder walls as well, because rings will pop out of their lands and scratch your block. Do yourself a favor, and get some turbo pistons. People that run high compression pistons + turbo, its because their pistons are forged, and they usually have a very good tune. I've melted so much pistons because of running lean and no tune, and we are talking about turbo pistons here. Hondas per example with high CR pistons and turbo use very small turbos , if they don't have any money to spend in turbo pistons. Leave the compression ratio as it is. Its not the same building every internal in an N/A block than using a turbo block and N/A internals like you are planning to do. Im using myself an N/A block with no problems, but im using turbo pistons, and i buy them new at 8$ each in my country. It doesn't matter either what gas you use, it could be 120 octanes, your N/A pistons will overheat and melt for sure.

Look at it this way:

N/A cars use high compression pistons to compensate, for the lack of a turbo.
Turbo cars use low compression pistons because they have a turbo to compensate for the lack of compression.

If you mix Turbo + N/A pistons (non forged) your engine is going kaboom!!!

 

[whiteythepimp]

Doesn't matter what car your running.. the higher octane gas you use the less knock you likely to have.. I have a fully built honda h22.. Factory the tell you nothing less then premium... and that cr is 11:1.. actually now it's 11.5:1.. If I run even 93 from a shit gas station i'll get knocks.. And first hand I know.. N/A pistons + turbo @ 10 lbs = block and pistons destroyed.. Granted the honda has an thin aluminum block.. Same concept.. Just nothing like my 4g63.. Don't even bother man.. Just invest the money in the turbo pistons.. Even if there OEM to save a couple bucks and do it the right way first man.. plus you do um now.. You'll save yourself the heartache later when you want to run a bigger turbo or more boost..

 

[Silverpearll]

I would highly not reccomend running NT pistons in a turbo application. The motor will not be as strong. Especially when you can buy a set of aftermarket cast turbo pistons for around 100.00 bucks. Also always run premium in your car if you care about the engine.