Rx-7fetish

Okay, due to a crappy stock tach, my ports open at 3k, a little soon. I really dont feel like doing anymore adjusting if im not even gonna notice any difference in the performance. (s4 with airpump mod) So i just need to know if opening early is killing my acceleration any, my ports havent worked right in so long i cant remember how it felt, just that its better with them opening than not at all.

farberio

iTrader: (7)

The ports open at the correct time for a reason, so you are probably opening some mid range power from 3 - whenever they are supposed to open. (brain fart)

HAILERS

I don't see the relationship b/t the *crappy tach* and opening of the aux ports. There isn't any that I know of.

farberio

iTrader: (7)

^ Good point, though I read that as 'based on my shitty tach' not because of the tach. Since he does go on to say he has a S4 with an airpump mod.

Rx-7fetish

Exactly, i adjusted my valves i installed to run off the airpump for my ports to open around 3500, according to my stock tach, which i recently found out is off by +500, so i really adjusted them to open at 3000. My question is if i go back and adjust them to open at 3500 is there gonna be any noticeable increase in acceleration or am i not even gonna be able to tell the difference. If im not going to notice a difference im just gonna leave it the way it is, its all functioning properly just opening them a few rpm to soon.

P.S. I was in a hurry to post the thread before work and at the time when i re-read it, it made perfect sense to me. Sorry for any confusion.

The Shaolin

iTrader: (5)

Play around it with it and see what feels best on the butt dyno.

Basically, I'd keep it to a point where you're not going to open them during city driving. If you always shift below 3k when you're driving around town, 3k should be okay.

RotaryRocket88

iTrader: (7)

What are you using the control when they open? RPM switch? Flip the dipswitches or adjust the potentiometer (if it has one) and set it right. I have 2 RPM switches in my car, and they took me a whole 5 minutes to adjust to the output from the coils. All you need is a friend to watch the tach already in the car, and tell you when the 3800 RPM setting really does activate at 3800 RPM.

Rx-7fetish

Mine is silicone hose and a fishtank valve. It really is a pain to adust the valve just right. Once i thought i had it right i covered it in rtv to hold the valve were i had set it, that crap is a PITA to get off and if im not going to notice a difference then its prolly gonna stay right were its at.

RotaryRocket88

iTrader: (7)

If they're opening at 3k now, you may not really notice the difference in power when you're at WOT, but partial throttle situations are where I noticed the change most. You're already much better off than the guys who think wiring the ports open works just as well, so that's a plus I guess.

Personally, I'd just get a summit rpm switch and an emissions solenoid. $41.95 for the switch and free-$5 for the solenoid depening on if you reuse one (EGR commonly used). It's so easy to setup, and it will be far more accurate.

Summit link: http://store.summitracing.com/partde...5&autoview=sku