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How much boost pressure can stock 1g internals handle?

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KCz Eclipse

KCz Eclipse

10+ Year Contributor
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May 1, 2012
Kansas City, Missouri
I have a 1991 eclipse gsx. It is currently stock with the exception of a 16g and fmic. Very soon i am getting a fp manifold, hard piping the intake, cant think of anything else off the top of my head. Am open to recommendations. Back to the point, how much psi will the internals handle. Not to mention injectors and other things. Im currently running 7 to 8 psi, which is very weak, and was looking to bump it to ATLEAST 12+. What do you guys think.:D

Thanks
 
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The stock 6 bolt with ARP head studs can handle as much boost as your little 16G can produce.

It doesn't come down to boost. Its about airflow, and the cylinder pressure caused by greater amounts of airflow. The stock internals can only handle so much cylinder pressure before things start to break.

Detonation(knock) produces A LOT of cylinder pressure and can kill a motor rather quick. It can cause premature rod bearing wear or failure. Can cause you to blow head gaskets or stretch head bolts/head studs. Melt a piston. And at the worst, can cause you to snap a rod. But at your power level, bending or breaking a rod is highly unlikely.

None of the 16Gs flow any more than 43lb/min, and you'd be lucky to get that on an Evo 3 16G.

A healthy stock 6 bolt motor can handle 50lbs/min on a good tune with the proper supporting mods, without batting an eye. They can handle much more than that too. But when you start getting into those kind of airflow levels detonation can do serious damage. The tune has to be PERFECT.
 
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7 bolt or 6 bolt I don't care 450 ft pounds of tourqe is alot for stock rods and rod bolts. A bigger turbo will change that tourqe band and let you make more and more but it is still a ticking time bomb.
 
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Bud92gsx said:
^ Really?Is that why there are people with 400hp on stock 7 bolt rods still holding strong.
Or 1g rods holding 500.
Or a stock block 1g doing a 9 second run.
Click to expand...

He said ft/lbs. A motor making 450ft/lbs will be in the 500hp range. I'd say that's about right for 7 bolt, bit more for 6 bolt.
A great tune will have more potential. An ok tune will last, but who knows how long? A shitty tune will bend them.
 
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Last time I heard the limits people were hitting with E85 and stock 6 bolt rods was around 600hp.

However, the Evo bottom end is known to be more reliable at those levels. Lucas English says on his very own site that they are known to hold up at the 500, 550, 600hp level when the DSM bottom ends couldn't have dreamed of it.

Now, I can't speak for Lucas but I'm not sure what kind of fuel he was speaking about or if he was saying it in general.
 
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Jesus christ you ####ing crazies. This isn't hard. RRE 1st Generation Eclipse  Upgrade Path This is the road race upgrade path, live it feel it, love it. That is the way to upgrade your car without exploding the damn thing prematurely. Make sure all the basics general maintenance items are taken care of FIRST! Really, if your running a 16g you should already have bigger injectors and some way to control them. The gold standard is DSM link (now you can get DSM link lite). Assuming your engine is healthy you can run as much boost as a 16g will take if your running head studs and don't detonate the thing all to hell. But you have to have the supporting mods to do so FIRST. I have a 91 with stock motor/ head studs that I run 22 lbs of boost with a big 16g and it's fine. But I also have all the supporting mods to do so safely. (including DSM link for engine management, and wideband o2 so I can keep tabs on the fuel mixture)
 
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Guys the OP only has a 16g and a FMIC. I dont think he should be asking how much power the stock block could handle because he doesnt even have the supporting mods to get anywhere near the question he is asking. Get the proper mods and then ask this question again sometime later. We all know that if tuned right the 6/7 bolt can hold power but not with just the OPs mods.
 
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reddragon1 said:
Find me a dyno graph and lets see when the tourqe comes on? I assure it's after 4500 rpm's given the turbo. I never said they can not hold it I said its a matter of time before they break. I my self have faith in the stock block that's why I'm chasing a few records for myself.
Click to expand...

a nother Dsm er here in Montreal had a 60-1 turbo 1200cc injectors run 38 psi for 3 years before he broke a rod that was on a stock 1g jdm engine no internal just arp headstuds :thumb:

p.s SORRY FOR MY BAD English
 
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There is no answer to this specific question, it depends on supporting mods & tune. One guy could run a 35R @ 35psi without a problem while another guy could blow it up with a 16g @ 15psi.

With proper supporting mods & a proper tune, it will hold everything your 16g could throw at it (of course this is with a good condition motor)
 
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daren_p said:
There is no answer to this specific question, it depends on supporting mods & tune. One guy could run a 35R @ 35psi without a problem while another guy could blow it up with a 16g @ 15psi.

With proper supporting mods & a proper tune, it will hold everything your 16g could throw at it (of course this is with a good condition motor)
Click to expand...

the better the tune the more reliable:hellyeah:
 
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the stock 6 bolt bottom is proven itself countless times, good example would be ostar motorsports that dynoed at 749awhp thats to the wheel, we are talking 800+ bhp numbers, i heard of another 6bolt in maryland with stock longblock with over 600whp as a daily, so its all about the tune, as far as boost pressures go, the 7:8:1 compression ratio will allow the 6 bolt to hold more boost then a 7bolt. i myself have 2g piston on 1g rods, and theres also a reason why the 1g rods are used in alot of fully built setups with forged pistons.
 
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Short answer. Yes 12lbs on a 16g and a FMIC will be just fine. As long as you have the aftermarket boost gauge and a MBC.

Anymore then that then follow one of the many upgrade paths to find what you need.
 
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that 6 bolt will handle anything that little 16g can throw at it, id advise the op to get a 2g maf setup with 550cc injectors, perfect combo for a starter and a tuning device like ecmlink.
 
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