Rep Power: 0

Hey peoples. Im hoping I can get some answers to my troubles.

Quick background... Im from Australia, the 7thgen only came here in the form of the four door sedan and the five door hatch. The sedan only has the d17a1,non vtec, the hatch has the d17a2 vtec.

Since crower are only doing cams for the vtec, I am going to need to do a head swap. No problems you may think, and you would be right.

Recent laws here in oz now prohibit young drivers from having turbo vehicles, thats all well and good, im not a young driver, but my gf is.


Long story short, im going to get a whole motor and build it up, instead of just swapping the head and using my bottom end.

Now, in the days past, people would say that for n/a you would want high compression and for turbo, low compression. Ive been reading some things on k20a.org (yes yes, i still dream of a swap ) and im seeing that with good tuning, they are prefering a normalish compression ratio(or higher than usually used for turbo applications) I dont know that this with the k, or all good tuned motors in general.

My plan will be to build the motor, hopefully using normalish compression pistons so as to lose as little power as possible while I wait for the next 12 or so months to roll by with my gf behind the wheel, then everything will be ready to go turbo.


***side note, i just got off work and im tired and i think im starting to ramble too much and get off topic ***



SO........basically im asking, is it safe to use normal compression, altho with a forged piston, in a n/a application until such a time when a turbo can be fitted and then have it function safely with boost??




Thanks for all those that stuck it out and made it this far lol.


-BEN

 
Rep Power: 0

there are a couple members on this site that got pistons from crower and one member in particular is getting some made from "JE"... the pistons will be forged and are running about the same amount of compression as the stock piston...

if you want to get high compression pistons for an NA application, you're way better off not spending the money to go turbo later....

 
Rep Power: 280

If you have plans going turbo later, then just spend $ and get forged low comp pistons.
Or better (depends on the person), run turbo on the stock motor, if its blows just replace it or rebuild it. Its more conventional, beacuse the blown or good motor will have to be taken out and rebuild...
Just my $100...

 
Rep Power: 396

The low compression is a safeguard. The lower the compression, the less power you'll make reguardless of boost or not, but it will alow you to run more boost safley. You have to balance it all.

 
Rep Power: 0

you can run the stock compression ratio fine, just tune it. The key is tuning...no matter was the C/R is if your motor is not tuned it'll make less power, run worse, and ultimately destroy your engine. That's weird they dont let "young drivers" have turbo vehicles, thats no fun

 
Rep Power: 0

Yeah thats what I figured, as long as its tuned right you can pretty much do anything. Obiviously some things are going to give better results, but yeah.

Its a bit of a pain in the ***. Last year there were way too many young kids in car accidents. GTR Skylines, WRXs, those kinda things with 17-21 year olds behind the wheel.

Anyways, thanks for the replies. Im going to build it up with the stage three Crower cam, valve train kit, rods and pistons that are a touch lower than I have now. Should be sweet for turbo when we are ready. I dont want to make huge numbers anyway, but I want to do it right and have it as reliable as I can.


Thanks again!


-BEN