Okay, this might not be new, some1 might hv tried it b4, i dunno, it just came to my head... asking for opinions...


Install a T in the hose going to the wastegate, then take the extra hose back to the hose connected to the solenoid (through another T).

In this way the solenoid is bleeding air from both hoses...


Some might say the extra pressure applied to the solenoid hose will equate the pressure taken off the wg hose, bringing the whole thing to square zero... i dunno, it's confusing me...


In any case, lemme hear your opinions plz


Thx

 

This sounds similar to my setup. I have bleeder installed just before the BCS. The pressure bleeds straight to atmosphere. No recirc into the intake.

 

aha, so it' like offsetting the dutycycles...
but i figured the other method will give you more control, since bcs is controlling the amount of air free'd up from both hoses (wg hose & bcs hose)...

just a question, how much boost do u hold on 7000 rpms?? to what load is this equivalent in your car???


rgds+

 

With a basically stock exhaust, I could hold 20 psi at 7000 rpm. That was the max though. My WGDC was at 100% to hold this. I just installed a CBE and 100 cps metal substrate cat about a week ago, and now it only takes 76% WGDC to hold 20 psi at 7000 rpm. Here is the thread on this:

https://www.evolutionm.net/forums/sh...d.php?t=324829

I haven't had time to retune the car yet for more boost, but I should be able to hold at least 21 psi at 7000 rpm, if not 22 psi. Once I get my 3" DP installed, I'll bet that I can hold even more at 7000 rpm (if I want).

The size of the bleed hole matters, but only up to a certain point. The efficiency of the intake and exhaust play a role here too (CBE + cat greatly reduced the exhaust pressure, so the pressure diff across the turbine was greatly increased making the turbo more effective). However, I don't recall seeing anyone being able to make more than 24 psi at 7000 rpm.

 

hmm...

i hv 3" tbe w'out cat, exst manifold, green drop in filter, very small pill (0.174" I believe).

24 psi seems alot, if you don't use meth + water i believe you'd def be out of efficiency range...

in any case, don't hv map sensor, but my boost gauge showing 20.5-21 psi at 7000 rpm, but this is equivalent to 237% load :S
This caused knock, and i hv to pull much timing to take it off, so i'll hv to reduce boost now... even with external temp @ 5-10 deg C (rnd 45 F)


Anyway, good luck with tuning your car


PS: what afr approx would 0.917 / 0.936 / 0.957 nb lambda reading mean???

 

Are you using EvoScan to get your load numbers?

 

yes...

load mut 2 byte mod 00 0.3125*x


i hv the 0.174" (0.7 mm) pill with the abv mods, wgdc from 6250 rpm and abv set to 100...

load: 280 peak, 270 all the way to 5500, 265 6000. 255 6500, 237 7000, 225 7500

that's wt i'm getting... i'll be turning wgdc down bcs im getting too much inconsistent knock and as i said having to pull much timing...


don't hv a wb yet, ordered one from evo8.com will be here in 2 days i guess... im relying on the fuel from my friend's identical evo 9 which showed 11:1 at his car...


any1 can help with abv nb lambda readings??

 

NB readings are only good for stoich. The voltages you mention can't translated to useful to afrs.

 

.91 = ~11.5/11.1
.93 = ~11.1/10.7
.95 = ~10.7/10.4

Very roughly ...

 

thx

i know it's very roughly, but for now im conserned that my car is not too lean...
im getting 0.936 higher than 6000 rpm, which would be around 10.5-10.8...

that means it's safe, i don't need to know more for now, thx again...

 

someone post a drawing or something im having hard time picturing this

 

Enough said right here imho.

Give me a break.

VERY VERY VERY roughly and probably shouldn't even be posted.

I've seen .91 = 12:1 and .95 = 11.5 not to mention every other combo under the sun.

Not to be trusted whatsoever.

 

My experience has shown that the NB O2 signal wanders pretty much every run ... you might get .93 one pull and then .89 the next without changing the fuel. I've tuned cars using the narrowband with some success, but you have to watch the fuel for several pulls and get an average for the NB reading as well as keep an eye on the IDC% curve ...

I usually rough in the fuel with the NB signal and then fine tune the IDC% curve based on know WBO2 logs from similar cars.

 

well these afr's are also confirmed by nb readings, which is not consistent i agree, but nb signal and afr's on my friend's car matches, so i think it adds a bit of crediblity...

In any case, im using the afr's from a fq360 map right now, until i get my own wb, so i think they must be safe, yet not as rich as the stock...



TB: I'm always getting 0.936 abv 6000, each and every run...




When i get my wb lambda & egt gauge, what's the max egt i should shoot for????


thx

 

thats exactly about what i get, 24psi peak with 19-20 to redline
280-290 at 3400rpm
220-230 at 7000