So I am very happy with my neo tune on my 05 s2000. My mod's to my engine are currently K&N FPIK, JVT header, T1R 70RT , Apexi Neo.

might I add that I really recommend the T1R 70RT exhaust. It sounds so freaking good and has helped me get some good power. I get told my s2000 sounds the best they have heard from a s2k. IF you get a chance try to hear one in person. You will fall in love with the sound.

**NOTE**
The place i got my car tune their dyno is called the heart breaker dyno since it reads lower numbers then other dyno's in the area so my numbers would be higher on a different dyno.

So my first pull on the heart breaker dyno was 208.42 hp and 145.45 torque. The owner since tuned my car was amazed because he said most s2k's on his dyno get around 190. He messed with the neo a little and gained 2 hp just lowering vtec to 5500. After about a hour and 6 or 7 pulls later i got my final number.

car came to 217.11 hp and 152 torque. Might i say this was only peak hp. My vtec was lowered to 5000 and still had room to be lowered since there was still a small spike at vtec. What really impressed me was the mid range gains. from 5k ish to 6k is i gain around 20 hp from 6kish to redline it was about 8-10 hp gain.
I will dyno my car again around April for a dyno day and i am sure i will be 225+ peak hp on it. Ill keep you guys updated.

My butt dyno also feels a lot more power. I can just tell by the way the rpm's shot up that it gained some good power. from 6k to redline it pulls hard!!!

I may have a question for you guys. I decided to take my back up fuse out of my car so my ecu resets everytime i turn my car off, but i was searching and it said my ac memory would forget and my radio would need to radio code again. BUT none of this has happened so hopefully i pulled the right fuse. The one I pulled was 3rd slot on the right side if I was turned upside down. The first slot was empty so i pulled the 2nd fuse labeled 25 which was brown I believe. does anyone know if I pulled the right fuse??
The reason I did this was due to the fact the ecu relearns everthing and can override the neo. So if you reset your ecu it will always be in default mode. I did notice the car feels a lot better when I did this.

I live in the midwest and don't have to worry about elevation. So this mod is harmless.

hopefully this was a good write up and I highly recommend a apexi neo if you have full exhaust bolt on's

 

Let me help you with some experience my friend, Pulling the fuse is not harmless if you have already leaned out your car like you have done with the neo. Its one thing to try this back in the day on those overly rich running 00-01 ecu's. Your car was tuned and is already running leaner due to the year and exhuast mods, I hate to see what your afr is now wile in ecu calibration mode 14+!!!

So to clearify now that you have pulled your fuse, it is running leaner then it was at the dyno where your tuner felt it was safe max, now you could cause overleaning/damage to your engine. I would recomend you put the fuse back in. when you pull the fuse, you re setting the ecu to ----- spec, it runs lean in this condition which is why you experience gains. Over time it learn and calibrates itself to the proper factory spec safe running condition, when you pull the fuse, that car re sets itself to this state as you know everytime you shut the car off. You multiply this on top of your mods and tune and you are really pushing you limits and beyond.

And by the way, ellivation would help you, higher elivation= less air/rich condition

 

oh ok well when I get home I guess I will put the the fuse back in. The tuner recommend me to disconnect my battary every week or 2 weeks to reset the ecu so it does not take over the afc. Is this not a good idea?

NOTE**

I bought a new battary that same day. About 2 hours before i got the car tuned. So the ecu was reset 2 hours before the tune. Will that make a difference ??

Can someone tell me if I put the fuse back in and dont reset my ecu. Will it take over what I changed on the NEO??

 

^^^ Ok let me fill you in a bit here and this may be something your tuner either doesnt understand fully about the s2000/vafc combo or he just didnt tell you. The partial throttle tune/closed loop ecu operation if he tuned this, will change and re learn effectevly canceling out what the vafc is doing in that operation, however the open loop/WOT throttle settings will not be effected and will always be in effect, this is where things get scarry when you re set your ecu because now you are stacking if you will, the lean re set settings of the ecu with the tuned settings of the open loop/WOT settings from the vafc. its about understasnding open vs closed loop settings and operations. closed loop means the car is thinking and taking in information to self adjust to the outside conditions. open loop does not and that is what you feel at WOT throttle. Hope this makes sense. let me know if you need further explination, you can pm as well.

I would put the fuse back in and enjoy the WOT power and not worry about the partial throttle settings he may or may not have made. Your WOT settings will not re learn, they will always be there. fyi I say WOT but actually depending on where your tuner set the throttle pos sensor settings it likely is closer to half throttle when open loop kicks in, thats closer to stock anyway.

If you know your neo enough to scroll through the fuel features, look for narrow throttle and wide throttle. The narrow throttle is closed loop and will show negative changes on the rpm graff if he tuned this. The wide throttle is your WOT open loop throttle settings.

Hope this helps

 

There isn't anything about this in the search function so hopefully the ecu doesn't change the neo's wot settings but I will never know I guess

 

congrads on the good results

 

It wont

 

Planning on using this mod for my completely stock 05 AP2; would it be worth my wild? How much did you pay for the dyno?

 

becareful when you are lowering vtec to 5k and not 5500.

I did some research when i tuned mine a while back and people that lowered their vtec below 5500 ended up having major engine problems later down the road.

 

[QUOTE=UniqueS2k,May 24 2009, 12:15 PM]