I'm just curious because it would seem that after 1st gear the MEVI would stay open anyways.

 

Not if youre running the stock ECU.

 

very true.

anyone ever try this for comparison purposes?

 

IIRC Ian did a run with it zip tied open.(stock ECU)

 

There have been a bunch of dynos (usually to find the switchover) both ways. There have also been time slips both ways too. The car will be slower with it zipped open no matter what. There is just not enough grunt down low (technically either way). With the factory rev limit a shift lands you back just before the switch over. Toss in a JWT and it could stay above the switch over but again you will loose tons of time where it matters, down low.

 

cool. But does anyone actually have any track times they would like to post?

 

From common sense, your first 1/8 & MPH will suffer, and your second 1/8 & MPH may be the same or a touch better (w/stock fuel cut) maybe....


It counts the most under the curve. Look at history.

Jime ran his best overall time due to his use of the FWD 3.5L IM. This IM makes more tq down low, but less up high.

His best trap came from a better high RPM breathing IM, but it wasn't his best overall time, even though the trap was better.

 

Nmex,

I see your point and thank you very much for taking the time to explain.

I should have been more up front by initially sharing my dilemma.
I have a feeling that my MEVI hasn't been opening consistantly or it hasn't been opening all the way. I purchased a different vacuum solenoid and all I can get it to do is open the MEVI all of the time. The car breathes so much better above 5k than before. I mean night and day difference.

 

sounds like you have some vac lines mixxed up, or a bad solenoid.

 

Because Jimes car is auto, his low end torque is important to the launch. But with a 5-speed, its a totally different animal. You can choose to keep to the 5000-7000 range throughout 100% of your run.

 

yea but then the opposite is true with top end. since an auto has longer gears it stays in the upper rpms longer. its all in the setup, you have to remember jime runs short slicks.

 

Obviously running the 1/4 mile with the MEVI open all the time isn't going to make the average Max faster. However when I rely on my old solenoid to open it at a certain RPM it isn't consistent.

The whole point of this thread was to get an idea HOW much of a difference leaving it open will make.
I'm still picking up alot of cool info though!

 

x10e^10 We cannot emphasize this enough, no one can. This should be looked at from every angle. Optimize your set-up.


Driving with it open as opposed to 1/4 mile racing is a little from the original post.

It will obviously make your low-mid range suffer, whichj in return hurts everday driving.(Driveability)

Are you sure it's your solenoid that's acting up, and not your RPM switch?