beaterX project thread

[mlomker]

I go a point lean without a shield on the intake but my O2s are disabled so it can't adjust.

410 on pump would be pretty crazy.

[Murlo26]

Very nice Scheides, glad everything is working out for you. Can't wait until you switch to E85, this setup will shine even more!

You going to rev to 8k on this setup always or just for now?

[scheides]

8000 is plenty for the street, I'll prolly do 8500 for the track, maybe higher as needed. Revs and engine longevity are directly related so part of me wants to keep the revs down but the other part of me wants to just use what I've built for things of awesome :D

[Murlo26]

You are a stronger man than I for resisting the revving...your car also works still so you might be on to something :)

The black really needs the extra revs though I think makes the transition between shifts way way better.

Does the bbx stumble at all shifting at 8k? I know my red almost stuttered at the stock rev limit.

[mlomker]

Does the bbx stumble at all shifting at 8k? I know my red almost stuttered at the stock rev limit.

Edit: I usually shift sooner than that, now that I think of it. It's hard to explain but it has always 'felt' faster to me to upshift than to wind it out. I have a natural tendency to upshift as soon as the dyno chart flattens.

[goodhart]

:drool:

Wow, I never thought I'd see the day when scheides had a built motor, 1680's, etc haha!

Can't wait to see what this bish does on E85!!

[scheides]

Nope, BBX I can shift at 6500 and the car is still plenty fun/fast. Half of the fun of having a super wide powerband though is just cranking on it and reeeeeeeeeeeeeeeevvvvvvvvvving it out faster faster faster woaaaaahooo! So yea I get what you mean revving higher.

The one thing I really want to work on the next time I go to the drag track is revving first gear higher. I think I could have picked up another tenth and with the extra power now it'll take some getting used to, but I have the valvetrain to do it now so why not. Also I was always scared to rev it too high for autoX but with the low gearing of the X I was sometimes hunting for which gear to be in; I think having a setup made to rev higher will make decisions like that easier, not to mention having more down-low torque thanks to the cams!

[scheides]

:drool:

Wow, I never thought I'd see the day when scheides had a built motor, 1680's, etc haha!

Can't wait to see what this bish does on E85!!

Heh, all I want is a healthy motor, a safe fuel, and a good tune. I don't think my priorities have changed that much, just those times ya know...they are a changin' :P

[scheides]

Well I think I've settled on 1.39*stock maf for about perfect scaling for my car and the 3.5" maf. Ironically:

area of circle: pi*r*r
inner diameter(stock): 2.8" (r=1.4)
inner diameter(primo): 3.3" (r=1.65)

area (stock) = 1.4*1.4*3.14 = 6.15 sq inches
area (primo) = 1.65*1.65*3.14 = 8.55 sq inches

conversion ratio (primo/stock): 8.55/6.15= 1.39

Others had told me 1.5 so I went with 1.48 to start....gah.

Anyways, been playing with boost. Goal is to peak to ~26psi and hold at least 25psi at 8000rpm. It's *not* perfect, but I'm getting there :) This is after about 3 revisions of testing.

http://scheides.com/misc/pics/evox/evox-boost-afr-tuning-progress-after-35maf.jpg
(note: these pulls were started around 5000rpm, just for testing upper rpm boost...full pulls I will do when road conditions allow)

This is using my hybrid setup: hallman MBC inline with pierburg 3-port bcs. Seems to be working nicely :)

[mlomker]

I think having a setup made to rev higher will make decisions like that easier

The back straight at BIR could be run in 3rd to redline or it's a very brief shift into 4th before downshifting again. I usually upshift since my issues have made me disinclined to really thrash on it. I suspect it'd be faster there to let it rip, though.