let me start off by saying hello. this is my first post here, although i've been a long time lurker. i've been reading everything i can, preparing for my first Evo purchase. i've been a long time honda guy, and have never needed more than one map at a time, so im going to ask away.

what i would like to know, basically is: what is a tuned stock ECU capable of compensating for? assuming it already tuned for bolt-ons, mild cams, meth kit, 3" DP, 3" resonated test pipe, and quiet 3" exhaust. then you weld in an e-cutout in the DP before any mufflers/resonators/cat.

ideally, i would like to safely drive the vehicle(sometimes hard) in any of the following three situations...

1- quiet exhaust, meth tank full, 85-90% of the time
2- open cutout in DP, meth tank full, 5-15% of the time
3- quiet exhaust, meth tank empty, 5% of the time

now in my brain i'm thinking opening up the DP would allow the turbo to spool faster and make more power, due to the shortest free exhaust route, but is it worth it? does anybody know what kind of gains(if any) can be had just by opening the DP. i'd love to see a dyno with before/after opening the cutout on the same tune.

my next question is: what do you do if you run out of methanol and cant get any for a few days? just turn the boost down? will the ECU correct the A/F for the lower boost?


again, i am still kinda new to this stuff, so please try to keep the laughter to a minimum...

thanks

 

Too much to ask from stock ECU?

Stupid question?

 

Opening the exhaust up on a stock turbo wouldnt really do much, as no one has any issues making 7,8, or 900whp on 3" exhausts with turbos flowing way past what a stock turbo can.

The stock ECU is incredibly capable of handling basically anything thrown at it, MAP's drag evo made 1053whp on a 76mm turbo. I specifically kept the stock ECU for my build which had made a best of 712whp/610wtq because I knew the stock ecu could handle it.

However, the ECU will not compensate for you running out of meth and simply turning your boost down will not really be enough to be safe because if you have a proper meth tune, timing and boost will be taken into account. You would need a 93oct map and a 93+meth map.

 

Actually, with the stock ECU and Tephra V7 there is a feature for if AFR goes leaner then you want, then it goes to low boost. In theory you could use that as a "failsafe" for when the meth runs out. When the meth runs out, it will go lean, then the ECU would know to drop boost.

But it seems like a bad "failsafe" as it would be reactive, and nothing will happen till things where too lean. The best "failsafe" for meth on the stock ECU is to run ECU boost and a relay from the boost solenoid to the meth kit. When the water go low or the meth kit has an issue, it can click on the relay and drop the boost.

 

Thanks for the advice/info!

 

Agreed. Meth injection is after all added fuel. So when you're spraying meth, be it with an on/off system or a progressive system, you have to tell the ECU to remove fuel since you're not adding fuel from an external source. What happens when you run out, is that external fuel is no longer getting added, and you run lean.

Most meth kits come with (or you can add) a warning light for low fluid. On my AEM 1 gallon kit, it came on when there was about 1/6th or so of a tank left. The LED also came on when the pump was spraying, and I had it placed within eyesight of the wideband so I can monitor both at the same time.

Regardless, use common sense. Keep the tank full, or don't beat the pulp out of it if it's running low.