Tune for NA KA?

[ADiamond75]

OK, here's my question.

I am fixing to do a NA KA build with 10:1 CR and some new cams.

I have three questions.

1.) will I need a tune to maintain stability in the engine2.) will I need bigger injectors?3.) Will I need a 225 fuel pump?

I used the search button and nothing was about NA motor tunes

[WI_S14_Goldie]

bigger fuel injectors and bigger fuel pump?? Nope, U will however need to start using premium gasoline. Those two options are optional. the 225 fuel pump is pushing it though..If u do decide to add those two options, ull need to get hotter sparks and new plugs..just curious what kind of cams do u plan on using??

[ADiamond75]

bigger fuel injectors and bigger fuel pump?? Nope, U will however need to start using premium gasoline. Those two options are optional. the 225 fuel pump is pushing it though..If u do decide to add those two options, ull need to get hotter sparks and new plugs..just curious what kind of cams do u plan on using??

Crower stage II cams. unless I find out that it would be a bad idea for an NA.

[WI_S14_Goldie]

imo i think that may be too high for what ur building. whats the specs?? If u upgrade to Stage 2 cams ull need to upgrade the valve springs also. 10.1 would be too low of a compression, ur compression should be at least 11's inorder to upgrade to stage 2 i believe. i think ur better off with stage 1 cams..Personally if i was in ur shoes and if i were building it just for daily driving and a few more ponies to play with...with ur pistons i would get either the JWT stage 1 cams or just S13 cams. Get hotter sparks and plugs. Upgrade the fuel filter and just add bolt-ons. That should provide a descent amount of horsepower to play with at an autocross track.

[zenkislider]

what pistons were you planning on using for 10:1? just curious...

[ADiamond75]

imo i think that may be too high for what ur building. whats the specs?? If u upgrade to Stage 2 cams ull need to upgrade the valve springs also.

Supposedly the stage II are good for street and don't need mods to the head or valve springs ... the stage III is a different story.

Also, I have never seen a stage I camshaft from crower .. even his site doesn't list one. If you know of one let me know where ... I am also debating whether to go with 10:1 or 9.5:1 ... gotta ask some more questions about whether a built bottom end and 10:1 CR can support any boost without going BANG! ... I know 9.5:1 can with low boost (like 7-14psi) with a built bottom end before it goes BANG! But I don't know about 10:1.

My plans are to make the car a fun daily until I can slap some more HP under the hood when I buy a new daily in a few years.

And to answer the question on pistons ... I have been looking at the CP and JE pistons ... recommendations are welcomed ... I don't want this thing to be a lemmon.

Of the following which has the best ring lands and is the most durable for high compression?

AriesWiescoJECPSupertech

Also, I am looking for some good rods ... has anyone ever had problems with the AMS turbo rods? Or if I am planning on going turbo with a high CR down the road should I just go ahead and buy the Crower or Pauter forged Rods?
Modified by ADiamond75 at 12:06 AM 8/17/2006

[WI_S14_Goldie]

high compression with turbo..thats a bad idea..if u plan to go turbo..in the future dont even bother with high compresion pistons or pistons at all untill u start pulling parts for a turbo setup. Labor work to take off the head and all will cost ur over $1000. for a "fun" daily N/A car just add bolt-ons and if u have an S14 just add some S13 cams. (240/248) Spend money on what ull evetually need like an lsd, bigger exhaust, cams, etc...

[zenkislider]

[ADiamond75]

high compression with turbo..thats a bad idea..if u plan to go turbo..in the future dont even bother with high compresion pistons or pistons at all untill u start pulling parts for a turbo setup. Labor work to take off the head and all will cost ur over $1000. for a "fun" daily N/A car just add bolt-ons and if u have an S14 just add some S13 cams. (240/248) Spend money on what ull evetually need like an lsd, bigger exhaust, cams, etc...

at this point a build is nessisary .. I have rod knock BAD and am having to rebuild anyway so I figure why not .... can a turbo be run with 9.5:1 CR?

[WI_S14_Goldie]

yea. but im telling u right now...u want to go with low compression when going turbo!! just rebuild it with stock pistons and aftermarket Rods..But honestly if ur gonna go turbo pretty soon just go with 8:8.

[180fan]

8.5:1 + turbo = good idea. higher cr + turbo = bad idea.

[ADiamond75]

yea. but im telling u right now...u want to go with low compression when going turbo!! just rebuild it with stock pistons and aftermarket Rods..But honestly if ur gonna go turbo pretty soon just go with 8:8.

Pretty soon is 2 years down the road for the turbo, but anyways, back to the main question ...

With bigger cams (Crower Stage II) and higher CR (9.5:1) and ported polished head would I need a tune or can the stock ecu compensate well enought ?

[WI_S14_Goldie]

No u can do that..