I have just finished installing my built BP4W and am currently breaking it in. The new engine has Ealge Rods and Carrillo Pistons (9:1cr), fully balanced rotating assembly,ARP Head studs and a GT2871. This timing map was running on my stock 230k BP4W with no DET at 12.5psi on a 2554. Was curious on you guys opinions about were my map should/might need improving with the new setup. I plan on moving the boost up to 15psi if my WRX 440's allow.

 

Well I have changed my Map twice since the post above, Ill post both.

Second Map :

 

Third Attempt

 

only glanced at the map, but why are you reducing timing in vacuum with each revision? is it pinging or something?
the original map running 38* was fine. also you can run around 26-27 all the way up to 100kpa.

15psi on the 71 should be 250-300 wheel, I'd be surprised if the 440's could support that.

I'd run somewhere in the 15-20* range at 205kpa peak load slowly tapering up toward redline if the engine is happy with that (since you're built). obviously would smoothly taper from 27* @ 100kpa to the 15-20* @ 205kpa

*edit: your last one is about right at full boost (I'm assuming 15psi like you said), just bump the low load timing back up like I was saying

 

No, it wasn't pinging. But even at 15psi on the 71 im still getting 11.5 AFR's. Here is one i did up real quick.

 

That looks better. You can likely run even more past 117 since there's no reason for dropping 5* of timing with only 1 psi of boost increase. Anything after that will require det cans or a proper knock sensor

 

Okay i just did a little more to it. But, more past 117kpa... How far up the MAP.? Im almost a little nervous adding any more LOL.

 

I don't know. But 150kpa is still only like 7psi so at least til then. just make it smooth and gradual, which you've done a pretty decent job of doing so far.

past that, det can time

if anything this will get you much healthier part throttle part load torque

with a built engine and good gas, you're still in relatively conservative territory

 

Car has nothing but 93 since i have owned it. But whats kinda making me nervous, is that i have a built engine, but all ready had it built before i had found out about needing billet oil pump gears and or ati balancer.... Which i have neither.. Im waiting for money to get right so i can get a balancer because im really not digging pulling the motor right now.

 

Thanks for all the help by the way!

 

Show us your old rods! And your shattered 5spd!

 

Oil pump and balancer are only really needed if you plan on going above 7200rpms or so. If you are keeping the stock redline I would not worry about them to much.

 

Thats good to hear. Makes me feel a little better anyways.

 

Well here is the rods, I dont have the transmission taken apart yet.

 

Okay, Engine is definitely not happy with this map. I heard Detonation in the higher Rpms in boost. Couldn't really tell while driving were in the map it was occurring, but it looked like it was coming from the 177kpa area around 4k +. I started dialing the entire boosted section of the map down .5 degrees increments at a time. I did stop hearing it till i backed it out 1.5 degrees. I need to get some DET cans.

I may need to go back and check my base timing again as well.