What are you using to log your boost? Care to post a boost plot?

 

I'm gonna stop arguing about it. All I can do is tell you I and several other locals had very bad luck with those things. I do wish you the best though. I didn't have the Titek piece.

I wish Razorlab would post his opinion of it. He's tuned and dyno'd many more cars than I have.

 

I've never done a A to B comparison of it as most customers install one with a turbo swap.

I can tell you however my personal Evo still has the highest HP on 100 oct with a FPgreen on our dyno so far. Obviously I push my car a tad more than customers cars but what is worthy of note is that my car is still on the stock 02 housing and I have nothing ported.

 

I'll try to find a boost/load curve with corresponding WGDC curve. Oh it could be my 9.8 hotside too now that I think of it. hehe

To all, if you get stable boost rather than fluctuating it will surely make you out-accelerate a car with fluctuating boost.

Example,
Car A has fluctuating boost
Car B has stable boost

Car A boost, 10 15 20 22 22 22 22 22 21 19
Car B boost, 10 15 20 22 20 21 22 21 21 19

In the end Car A had stock turbo outlet, Car B had aftermarket turbo outlet.

This is all theory though as no one has before and after data of changing turbo outlets. Chamama's car is obviously out-accelerating his before car. Problem is who knows what helped to get him his current boost curve.

 

Here are a couple of most recent data.
ECU+ is used to log everything. MAP sensor is GM 3-bar. Load is 2-byte.
You can see from about 4000-5000 there is a fluctuation in boost even though the WGDC is constant (boost error correction is off).

So is it due to my 16G-9.8T or the stock turbo outlet? Or something totally different (like the cat)?
Mods: downpipe, 200 cell cat, cat-back

 

Bump up the WGDC a little bit in that section. Remember you can rescale the RPM in the WGDC table so you can give yourself a little more resolution in sections like those.

 

I have an '03 VIII with 3" exhaust, no cat, HKS 272s, and 10.5 hotside. I still see the dip right around 4500. As far as I can see, it's just a characteristic of the engine.

 

on my 2004 edm evo VIII - 3" turboback and free-flow cone filter - I see the same dip in the boost- do not know how to cure it (WGDC is 100% over there all the time)

 

I will try and post results. Thanks for the input.

Thinking of the dynamics of everything I can't explain why the WGDC curve would have to bump up like that. In theory if you left WGDC at a certain number through the whole RPM band then boost/load should hit some peak and fall off.

Does your car do this, Bryan? Or maybe it's just with 03s?