93Euphoria

So I just raced a random seem to be stock WRX STI vs my stock LT1 from a 40 roll to about 120 and lost by 1 car length and im pissed off. I felt like I would of passed him after about 125mph. I cant believe I got my *** handed to me by a ricer, which gets me more focused on my build. Any words of wisdom to help me feel better? lol But whats the max RPM a stock bottom end can handle with new bearings & rod bolts? Are stock pistons brittle with a H/C/I setup?

nomoneyz

iTrader: (15)

I wouldn't be pissed. If it was newer one even with minimal mods they move out. Our cars are old and most high mileage. I would think a full bolt on lt1 would've gave that car a good run. From what I hear its safest to keep shifting around 6200ish. I'm no expert but I read that a lot on here. A stock bottom end is still a stock bottom end and your going to need some valve train to spin high also. People will tell you go ahead so akes everyone's advice and do as you wish.

bufmatmuslepants

iTrader: (3)

full bolton with a tune you can shift at 6100 fine, do 1.6 NSA rockers on good springs and you can take it to 6300 before it falls off. good luck. search the classifieds for deals.

Rob94hawk

iTrader: (1)

Heads and cam it. You wont regret it. How many miles on the block?

93Euphoria

about 220k miles. A lot of miles but just replaced all the seals & oil pan gasket, new opti, new water pump so I shouldnt have to worry about the opti for the next 30k miles.

Rob94hawk

iTrader: (1)

Do a leakdown test. Make sure the rings are good. You get higher cylinder pressures with an aggressive cam. Especially if you go with a thinner head gasket or mill the heads .001" or more for increased compression ratio.

bufmatmuslepants

iTrader: (3)

mother of god....


Id at least do some LT4 valvesprings and whatever self aligning rockers you can find used in the classifieds here.

93Euphoria

Probably a Custom Ai grind with Nextek Springs, 1.7rr shaft mount rockers, Solid Roller setup w/ Full Bolts ons, Monoblade Along with a H/C/I package. Ill be spinning high. Ill refresh the bottom end with bearings, ARP rod bolts, and hell fire rings. With the stock bottom end refreshed 6200rpm is a safe limit? I was hoping for atleast 6700+rpms.

Rob94hawk

iTrader: (1)

Don't forget to ARP the mains. Solid roller is a bit overkill IMO with stock parts. Loyd Elliot didn't recommend it. Depends how well it's rebuilt and what you're going to use it for. But I have been a bit higher than 6500 according to the stock tach.

Note your funds too. Even with a rebuild bottom end with head a cam it starts to snowball. Especially when you have the engine on the stand. You start thinking of ways to spend money on more upgrades. lol

Just consider this, once you have that much power **** starts breaking around it. I'm still waiting for my stock rear to grenade.

FAD2BLK93

Stock tach is about 200 rpm high. So u were spinning it to probably 6300. I thought the limit on these motors was more to the 6400 range? Which a safe limit would prolly be 62-6300. Which means i shift a little short on my 503 with Pac springs. Probably alot short now that i think about it. Damn it. Ha

SoxXpupPeT

iTrader: (34)

I always heard shifting above 6k on a stock bottom end is skating on thin ice... OP Do you have bolt ons? full exhaust, intake, tune, stall/gears? IF not i would certainly tackle all of those things first then do a nice cam swap with some light head porting. If your worried about the bottom end pull it and replace everything with ARP Fasteners. Id replace the pistons at the very least. Crank and rods will support plenty of HP until you go with alot of boost or alot of nitrous. Bump the compression and slap it back together. of course dont forget the fueling if you were to get that deep in it. Fuel pump, filters and injectors. it adds up quick but youd certainly destroy that WRX the next time he pulls up next to you

defaultexistence

iTrader: (11)

Yes , and at this point your also talking Balancing the Rotating assembly,Rod Resizing.
Its highly recommended to also alighnhone the mains with the new ARP main fasteners to be properly installed ..
As it is OP new rockers and springs along with exhaust and a stall would get the first stage of performance gain.
Most Turbo ricers i run into are top end rockets.. U Need to spray up there to hang at that 40 roll .Eliminate valve float,replace those worn out springs and gain some topend back.
FWIW

93Euphoria

Thanks guys for the boost. As far as I am in my decision to baptis(reborn) my LT1 and I pretty much made up my mind into keeping the LT and representing opti power, but I was wondering how much am I looking at for an LS2 swap? The LS2 come with 400hp and by the time I get LT1's first rebuild ill be hoping for 400hp to the crank. Which 400hp would be worth it? A LS2 swap or a rebuilt LTx?

defaultexistence

iTrader: (11)

Jesus dude.

FAD2BLK93

LE2 would be the way to go!

93Euphoria

Sounds like im staying LTx.

93Euphoria

Arent LT4's redline at 6300rpm? the same bottom end as the LT1. So why not 7000 with a good tune and some nice forged pistons!

bufmatmuslepants

iTrader: (3)

LT4s have 4 bolt mains. As long as while you are doing forged pistons you put in ARP rod bolts and main studs, you will be fine. That is the weak link in these bottom ends.