Van

Before I put the dyno away, I decided to do a little test on my car. I did 2 runs back to back... one with the LBE and one without.




It does what it's supposed to. It lets the boost build a little higher by not letting the cycling valve actuate the wastegate (4k RPM to 5.5k RPM), but, once the set pressure is reached, the wastegate actuation works like normal. The extra air gives a noticeable bump up in power in the mid-to-top end.

Techno Duck

Van, i was going to reply to the email but ill just say it here. I would be careful running with the LBE as you are running dangerously lean.

I also think the car maybe should have made slightly more HP at 15psi, i think around 250-260whp is realistic, especially with a 26/8. My car mostly stock (just a MAF really) did 265whp @ 14psi. Maybe some more merit to the dyno reading a little low.. . Every dyno will be different though, consistency is all that matters.. i guess i am a closet dyno queen sorta guy.. .

Luke

Techno Duck,

Lean with the vane meter?

Van

Thanks Jon, I was hoping you'd give me some feedback on that. I have a 3 bar pressure regulator kicking about... had I know, I would have put that on and done another run.

86 951 Driver

Did it really make the car produce 15 more HP. If so that is awesome.

minho78

That's 15RWHP. Van very nice, although like Jon said you are in the dangerously lean area at the end.

But your experiment was actually very informal about the results with an LBE. Thanks for posting your results.

Techno Duck

I just looked at my charts and it shows the AFR leaner by about .4-.6 points that what my wideband says in car. Ive heard that the tailpipe sniffers can read slightly leaner, but i was under the impression this was only when running a cat on the car. Anyone know for sure about this?

rlm328

It did it with 2.25 psi additional boost. I would anticipate more with that much additional boost. And I agree Techno Duck, you are way too lean.

86 951 Driver

He also used the LBE as a mBC as well I guess?

Van

I'm using the stock cycling valve and stock KLR chip to control boost. I thought I had the LBE set to 11 PSI, but this shows otherwise. In the stock setup, the cycling valve starts letting some boost pressure go to the wastegate as soon as there is boost pressure. Once the boost pressure in the intake is equal to the LBE setting, then the excess pressure goes to the cycling valve, and, in turn, to the wastegate. When the boost level drops back below the LBE setting, there is no more pressure being sent to the cycling valve to actuate the wastegate.

So, in a way, I guess it is like a boost controller.

dirtyTurbo

Great idea, I'm sure a lot of people would be interested in seeing these charts after reading about the LBE on Lindsey's site.

I'm new to the whole dyno chart thing but it looks to me like the boost enhancer isn't enhancing anything? The graph show relatively the same style of buildup but the boost enhancer letting more boost total. I didnt notice anything when i added mine either other than occasionally it went to 11psi instead of the 10 stock.


I plan on using mine as a controller I like the idea of having a computer rather than a little valve between me and the lief of my head gasket

Van

I don't know the answer for that... But, I was just looking at the GT3's data, and, although he's naturally aspirated, the data shows he was running between 16 and 18 AFR. (That also had twin tail pipes... and I couldn't stick the sniffer that far in.)

So, it's quite possible all of our AFR's are reading on the low side.

Also, I looked up some other GT3 dyno charts, and Mark's car seems a little low, although the profile of the line is quite similar. So, it's also likely that my dyno reads a little low.

piperporsche180944

Nice numbers, 15rwhp for what? $90? Not bad at all!

Willard Bridgham 3

The seat of the pants dyno told me that the LBE works. So did lap times.

eric951turbo

thanks, this is great information.