nize

it seems my after-a/f goes pretty rich quick, and then lean near redline. is this something i should be worried about?

the chip is an APE2 chip. only other mods are lindsey 3" pipe and LBE. everything else is stock, wastegate is not shimmed and is also stock. boost spikes to 15psi and then drops to 12psi when wastegate opens.

mark944turbo

If this was my car I would want to see a flatter afr curve. You are way too rich from 4-4.5 k rpm, and keep it in the 12s to 11s from then on. I am not sure about what autothority does with ignition timing, but its probably not good from what I know about people with these chips and headgaskets. This is why I would pick 11.5 over 12.5, to fight detonation. Definately need to lean out 4-4.5k though.

facboy

yeah i think that's typical of running APE chips with an MBC (which the LBE essentially is). it doesn't look too bad near redline though - i'm assuming it's the blue line? wat is up with the red line? that looks awful lean through the mid-range.

nize

the red line is all stock. blue line is with ape2 chip.

hosrom_951

Do you have a fuel controller?

Tom M'Guinn

That looks like APE's classic valley of richness. I tried every trick in the book to eliminate it on my car, and finally gave up and got chips from Vitesse.

nize

no fuel controller, just the chips, lbe, and exhaust.

Jason_86_951

Bypassing the CV, which will allow a quicker spool up, "might" flatten that out. It should bring full boost a few hundred RPM's sooner and use up that extra fuel. But in order to do that you would need to get rid of the banjo bolt's jet, go to a reliaboost (has the drain hole) set to no more than 14-15psi. That should clean it up. I would NOT shim the WG as you have no more fuel availible up top.
Hope that helps,
Jason

nize

isn't that basically what the LBE is already doing? should i ditch the LBE and get a reliaboost instead?

Jason_86_951

Yes and no.
A LBE builds boost quicker but, needs the CV in place to vent line pressure. The CV slows boost build-up. The reliaboost has a small drain hole on the WG side to assume the venting duties. I noticed a big difference in spool up when I did that to my car.

Tom M'Guinn

I tried adding boost to flatten out the APE curve, and it did not work for me. The higher boost would trigger a higher mass-air signal, bumping me up to a new fuel cell in the dme -- and keeping it rich. I suspect the same would happen with a AFM, but it can't hurt to try.

mark944turbo

How does the LBE build boost quicker? That doesnt make much sense to me, it is sending more pressure to the WG due to a lack of a bleed hole, making it open sooner-> slower boost build.

Also, having more boost at is not necessarily going to make the car run leaner, it is just going to shift what values in the chip are being used at each point in the dyno graph. The mapping is based on load vs rpm, not just rpm. With more boost, he will be in a different "zone", so everything changes.

nize

LBE initially prevents any pressure from going to the WG because it won't open until a set psi, which spools the turbo quicker.

read here;
http://www.lindseyracing.com/Merchan...1BOOSTENHANCER

mark944turbo

Sorry, the way you worded it, it sounded like you were directly comparing it to a reliaboost, not a stock system. Now I see what you are saying..

Jason_86_951

With the stock AFM the DME doesn't bump it into a different map based on boost/rpm, it has one map for WOT. The pressure signal to the KLR is for overboost protection not fuel management.