500hp or more

[IGottaSy]

How would this build perform leaving that 9.08:1 compression and using stock induction components? If I start with 300hp, 15psi later I'd hit about 600hp. Right? I suppose 60# injectors would be border line to tune for 500hp at the flywheel with this build. Race fuel or alcohol injections would be a must as well. Could a TT chip+injectors handle it? what can I expect to end up with as far as compression goes when hitting 15psi? Is it .5 point for every lb of boost? Looks like a stout build to take some good pounding.

http://www.hotrod.com/techarticles/engine/113_0208_chevy_43l_262ci_v6_engine_build/

 

[dgoodhue]

Re: 500hp or more

If you were to add the stock intake and exhaust manifolds to that motor it would not make 300hp. Yes adding 15psi should about double the hp.

The problem with following that build. The cam isn't turbo friendly, you would want a cam with more lobe seperation. Pick a custom cam (best bet) or the comp cams 415 or 422. I would buy eagle rod rods rather than modify 350 rods like they did. They also modified the pistons. They ported the stock heads and if notice in the article the heads flow 208crm and cost them $3k. Stock Vortec heads flow more than that.

Equavalent boost to compression, I found a formula and calculated it for the vortec shortblock I have. it's closer to 2 psi per 0.5cr. As for using TT 60# chip, I doubt it will work. Changing the cr, head and cam will create havock on map base fueling tables. I can tell you from my own experience in tuning code59 with a higher cr motor that my motor had some serious lean spots using the code59 60# starter bin.

 

[MadMike]

Re: 500hp or more

Your going to need alot more injector to run alcohol at that kind of power level. But that's my vote on fuel.

That CR ratio is fine. You might just have to use more knock prevention methods when u really get that motor working. That's why I say go with e85.

You will def need more than 15 psi.

Thought i d make those few points. You still have a bunch of homework to do. If you think copying that build is a good idea for 600hp your way off on your T basics. Vortec and forge it out that's a start to something more realistic.

 

[SYCLONE#1531]

Re: 500hp or more

Why just keep it stock for that hp level! I did..60lb injectors / Rpm multi chip tune. 61mm pte turbo. 26psi VP Q16

 

[IGottaSy]

Re: 500hp or more

Thanks for the input. I am planning to build a roller, vortec headed long block to beat on while the stock engine is running great. Got plenty of time(knock on wood) to do research and blue print a good build. I wanted to start with as close to 300hp as possible because then I wouldn't have to run as high psi to achieve my goals. I don't really like alcohol injection because of the extra chore of replacing the spark plugs every 1000 on a daily driver due to the corrosive properties of the alcohol. I though 60# would support close to 500hp rather well. Code 59 is too involved for my lack of free time. I must read on. I knew there would be differences from the build I referred to and appreciate the posts that address those differences. That build is for N/A but change a few aspects and it can be made to work with power adders. Good information to have.