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Originally Posted by rollhard
Hi Lurk,
I will try to help you the best I can. Dont take anything personally if I point out any mistakes you have made. 
First of all, youre going about this the wrong way. Normally aspirated at a compression of 8.5:1 and large injectors like that...your car is going to run like complete crap...assuming it will run at all. I really question the mechanic that is doing the work for you as he should know this.
The compression of the motor does not effect the displacement of the engine itself at all. You can have a 2.0 motor go from 11.5:1 compression to 8.5:1. All that has changed was compression and not displacement. Its still a 2.0L.
Tuning NEEDS to be done on the dyno with a wideband. Simply saying -27% is not going to cut it because you have no idea how rich or lean you are running... In this case, youre running piss rich. So rich that I can see your car hardly idling and hesitating as soon as you give it gas. If you plan to turbo the motor, you should really do it at the same time. A motor with that low of compression will rely on the boost to give it the power it needs. Without the boost pressure, its going to be a dog. Im talking less tq than a b16 engine. The best thing you can do now is to get the turbo on there and take it to a real shop that knows what they are doing. Any mechanic that will install that stuff for you and let you drive off is not worth a penny. You would be surprised at how many of our customers are other shops who completely F'd up their customers cars. If you want to drive the car as it is right now, swap the stock injectors back in and leave the afc settings at "0". The injectors are easy to install so you can do that when you are ready to turbo the car. Dont expect it to run like your stock KA though since your compression is so low now. |
ummm... heres somethings u should think about.
#1 making the safc run -27% across on 370cc injectors threoretically should make them run like 270cc's (do the math). i ran 480cc injectors + safc2 and i set it to -44% across while NA and it was fine. (my wideband even said so)
#2 running 8:5 compression NA isnt that bad. i ran 9:1 compression while breaking in my motor with 480cc's + safc2 + z32 maf and it felt like stock. only .5 compression difference between mines and his. 1 compression point drop from 9.5:1 to 8.5:1 would be like what, at the most, 10 hp?
#3 having less torque than a b16 while a lil lower compression? i was still able to take off on my bro's vr6 jetta with my "lower compression" pistons + "larger injectors"