sav180

starting my build jus got a set of 90 kae pistons off of ebay wit coating on the top..xcessive intake mani,obx headers,f1 flywheel,zoom stage 2 clutch,shaft masters aluminum 1 piece drive shaft(+ 2 for them!!)calico main & rod bearings from ams,eagle rods.port&polish exhaust side on head...waitin on obx pulley kit,n60 maf...now should i go ecu tune or afc??thinkin of getting bc vavle spring kit..240 and vin whats ya take on this??

sav180

oo runnin 248's as well as tanabe 3inch catback n catco high flow cat

BigVinnie

iTrader: (2)

Seems like a nice set up, I would practice with an safc for a bit save on the cost of a expensive tune for a while. Tinker with the afr's and ignition timing until you find that happy place for power. Once you think your happy enough with the settings (a/fr's and timing), move onto an ecu tune.
I wouldn't be surprised if you could beat my 163whp with that set up, proper tuning should put you at about 180WHP or better. If you want to make more power you will need adjustable cam gears to retard the intake cam a bit.

sav180

3 or 4 degrees for 248 cams??

sav180

efi i seen does ecu tunes for 300..

Product Information
This upgrade is for 1991-1994 KA24DE running all motor setup. This will be a custom tune specific to different cams, high compression pistons, and headwork. The fuel and timing maps are remapped and optimize for all motor KA24DE. Speed limit is removed and the rev limit is raised. Intake, header, and exhaust are recommended for this setup.

sav180

or u think i might make more power with a afc or emanage??

BigVinnie

iTrader: (2)

Using the stock 248 cam exhaust on intake side you will want a 2 degree retard without the high compression pistons (using the stock 9.5:1 pistons) since the exhaust cam on INT after the 4 tooth advanced method puts the cam advanced 1.7 degrees advanced from stock position. Adding the high compression 90 E pistons you will need an additional 2 degrees retard which would be a total of 4 degrees total retard using the exhaust 248 cam. This makes up for crank stroke and maximum chamber volume on downward stroke.

If you were to use the 89 pistons you would need 6 to 7 degrees of retard. Your better off using the 90 pistons.

Practice, practice, and practice what your A/Fr's and ignition timing are with your set up using an SAFC to start with. You won't regret it, and once you have the basic fundamentals down and know what you want your A/Fr's and ignition timing to be then you can discuss with some one that does ecu tuning what you want your settings at. It is much more direct and it uses your own R&D rather than some guy giving you the same fuel and ignition maps that he does for every engine anyway.

sav180

what bad would happen if i run the 4 degree 248 cams wit the 90 pistons??will i bend a vavle??im tryin 2 have this up n runnin asap..should i run 370 injectors with this setup ??