who here is running the lsj up to 8k rpm? what is needed to do this?

1. valve springs and retainers...
2. neutral balance shafts...

anything else? i really think this would help with 1/4 mile times, and i am wondering why more people arnt doing it?

 

yes thats what u need...and its not as easy as it "seems" thats why people dont do it

 

Cams that will allow power up to the 8000rpm range as well would be good to add to that list as well as some adjustable cam gears.

Talk to Witt and Area47 about this since they have a lot of experience and hands on with it.

 

most dyno graphs i have seen, including mine make power all the way to red line... so would cams be needed or recommended?

for my next couple of mods im thinking about getting

1. forged 10.5:1 pistons
2. valve springs and retainers
3. neutral balance shafts
4. head gasket and studs
5. mild head work

 

don't run the high of compression your running a boosted engine.

 

huh? i plan on having all cooling mods plus meth... what 10:1... i wanna make the most hp possible on the sc looking to make 275+75 shot = turbo lsj territory

 

10.1 is the limit i would go i think 9.5 is perfectly fine to be honest. a full point in compression is about a 4% power gain at the cost of having to run that high octane and lower timing.

 

9.5:1 is stock right? i wanna go at least 10:1... i shouldent have to pull too much timing, cuz of meth, right?

 

im running 10:1 and have to pull hella timing and im fully ported (which should lower compression)...listen to the man lol

 

wsfrasier was running 20* i think on meth, high compression is not needed on a boosted engine becuase of the compressor (s/c or turbo) forcing the air down into it. It does a good job filling that cc all by itself.

 

ok thanks, i'll probably stick with 9.5:1 then... **** well i might be able to squeeze off a 75 shot on stock internals then... i know some are doing it. it just thats by far in no way a safe build!

 

You'll need more fuel then what those 42.5#s put out to run to 8k also.

 

i'm searching, and havnt found what company sells valve springs for the lsj that can handle 8k or so?

 

you really need to search harder then. Supertech and ferrea make valve springs for our cars.

 

i got some more info, but i want to keep the stock cam, does anyone know the rpm limit on the jbp springs that are supposed to be perfect stock replacement hight?

 

show me a dyno where its makin power to redline?
cuz every one ive seen it starts to drop at about 6800

 

http://www.allecotec.com/product_inf...roducts_id=119 what about those?

 

You are going to need a built motor, because there is no point in reving to 8000 rpm without cams and head work. The stock head has tiny exhaust ports which severely choke the motor above 7000 rpm. If you port the head, and get some decent cams, then your making more power than the stock internals can safely handle.

 

yeah like mine in my sig lol..... i know i meant, its still making good power like for example my peak hp was 240.6 at 6758 rpm or something but at 7136 rpm i was still making 239.3 and then it shows i hit rev limter... WTF... but its set to 7300 so i dont know what was up with their tach pickup so im thinking 72-7300 rpm still making 239 that only 1 hp less...


i dont know tell what you think about this... ^ and this was all before port and polish throttle body, blower, catless dp and meth... all i had then was I, H, 2.8 and ZZP tune... so know with it breathing better and flowing good for top end hp i want like 7800 rpm for track use...

 

I could be wrong on this.....
but im pretty sure your cam is still going to be the deciding factor in where your power begins to drop off, regardless of porting/exhaust/meth....

 

true... i think your right about that one...

 

i made peak power at 7200 with no timing in the car

 

do you have a dyno sheet of it lsj?
i have yet to see one make higher power after 6800 with stock internals

 

yeah give me a sec

 

well on the higher boosted/hp cars stock cams, peak power is at 6200rpm. Need a decently bigger cam, and the supertech 76lb springs would be fine. Add in some nice forged slugs at 9.5:1 compression, nuetral balance shafts, and you're good to go.
Stay away from 10.1:1 and > compression, unless you run 100+ octane everyday,