orangecobalt

I was pondering the idea of beefing up my L61 so it can take a 125-150 shot next winter as a project. Now I have been doing some reasearch as to what would have to be swapped out in order for it to work. But have a few questions...

1. Would keeping the stock compression ratio be alright for this setup?

2. I am using the 250-400hp build book as a guide. I don't think I am going to need all the parts listed. I was thinking of forged pistons, connecting rods, head studs, head gasket and I am already running 2 step colder plugs. Are the adjustable cam gears and valve springs and retainers needed? Remember the highest I MIGHT hit is 300 whp.

3. What about the transmission? (4t45)

4. Will the stock intake manifold be fine? It is tested to 350.

5. will a bigger fuel pump be needed to compensate?

I think that is it for now. If someone can answer these questions i would greatly appreciate it.

Imlikedrpepper

Something tells me your going to go BOOM very quickly.

bc3tech

stock intake manifold is good to flow 500hp.

valve springs, cams, retainers are really only needed if you're going to rev higher (as far as i know)

http://www.year2032.com/ecotec.htm

D4u2s0t

for the amount of time and money you're going to spend preparing everything to take a 150 shot, you're better off just building the engine and having the power all the time... not just at a push of a button... this is a 4 cylinder car, not a v8...

bc3tech

+1 once you're done w/ that build you could push 350 w/ the supercharger kit, easy. way over your 120hp + 150hp.

orangecobalt

If I wanted to go the f/i route I would...but I don't. Is that to hard for people to understand? I don't see any sense in having daily driving a 300hp car. Nitrous would be used at the track ocassionally (sp)

D4u2s0t

they way that you would have to build/tune this car to take a 150 shot, you think it will be able to be tuned for that and still be driven on the street with no problem? i think you need to do some more research on this before you blow your car up

the1&only

Dude bequiet, there are a lot 4cyl. that are tuned to run nitrous only occasionally and are daily driven FINE. The guy already said he doesn't want a blower, so unless you have ANY advice to help him with running nitrous, just STFU.

Good luck orange.

D4u2s0t

i gave him advice troll... i told him to research

the1&only

That is what he is doing with this thread *******.

Edit... don't send me love letters through PM, because YOU posted in this guy's thread FOR NO REASON.

the1&only

Orange I would suggest going to a stand alone so you can fully tune for the nitrous or hopefully HPtuners gets something going for you guys.

orangecobalt

Funny, I know of daily driven cavy's that do this. The only problem I could see is the fuel issue which I don't think would be a huge issue and timing which can be adjusted with a MSD DIS. As I stated this is a "maybe" project for next winter. That is a year away, so leaves me lots of time for research. If I wanted a f/i cobalt I would have got the ss/sc, but I don't...get over it.

Also, I believe what I am doing now is considered reasearch isn't it? If you don't have an answer to my questions, don't post..simple as that.

D4u2s0t

whoa, my bad dude... i wasn't talking bad about your ideas or plans... was just offering an alternate solution... i wasn't sure how much you had looked into this... some people just want nitrous not realizing that the engine can be built to have that power... didn't mean anything by it, so sorry if you took it the wrong way...

Halfcent

If you are serious, I have the GMPP L61 10:1 compression ratio piston set that use the LSJ rods for sale. They are perfect for the kind of nitrous engine you are considering.

celicacobalt

the tranny will need beefed up after 250 tq

orangecobalt

Pm sent.