I'm at a point now where I'm holding a mid 11's afr with 18 degrees of timing. I dynoed like that just for fun. I put down 201 whp and 175 wtq. I feel like I should've had more torque.

My plan was to tune for a mid-high 11 in terms of afr and run as much timing as possible with a 5gph meth nozzle.

Am I in the right here or would I make more power with a richer mixture and even more timing. What has experience told you guys?

Relevant mods are: M62 blower, 3.2" pulley, dual pass, meth injection, 2.5" exhaust

 

From what I've seen personally there isn't much difference in power between low 11's to high 11's. But, @ the same time I've never seen any ability to lessen KR at a small difference in AFR like that.

Personally I would see if you can adjust your KR threshold if you can only pull 18 out of it with meth.

 

I can pull more than 18, that's just where I am now.

 

running meth on a stock pulley... why?

 

run that timing WAY up if you'd spraying methanol and you'll pull some more power out..

auto or manual trans?

 

cause the stupid car heat soaks with stock pulley and stock setup rallyartist proved this a long time ago. Believe it or not the meth and good tunning will net you some significant gains....

 

1. Help out injectors already being overworked.
2. Help with heatsoak
3. Much more timing. I'm pretty much limited to 16 degrees without meth.
4. Leaner afr during boost, "lean is mean"
5. So many more.

I plan on it. I installed the meth, but haven't really had to time to work on tuning it so I went with 18 because that was a nice number. I've read a couple places that anything over 25 degrees is bad for the rod bearings? How is that different from the car stock having 34 degrees of timing on the interstate?

Manual trans.

It's actually a tad bit smaller than a stock pulley, but yeah, that's the idea. Help battle intake temperature. I also have a dual pass endplate on my intake manifold.

 

You need more timing in it. Tune first for 11.6-11.8 a/f ratio to start. Then add timing in until you see knock and back it down a degree or two. There is plenty more room in your setup especially in the timing department with the meth. The torque number is fairly close to what I would expect from your current setup. A smaller pulley would also bump you in the torque department a bit as well.

 

guys keep in mind this is a cavalier with an l61 (2.2l). they have a higher 10:1 compression and cast pistons with the top ring very high up the piston. its very easy to break those pistons.

that being said, you should still be able to crank the timing up a touch, however you wont be able to get it as high as an lsj with equal mods. as for running more than 25 degrees, lsj guys usualy dont go higher than 26, there is no more power to be had that high. its different from running 34 at cruise because at cruise you are at light loads, more timing helps fuel economy, with full throttle it creates a lot more stress on the rods, bearing and the crank. going too high with timing, even without knock, will cause problems.