fixing lag? - Perth-WRX.com

fatboy · #1 28-09-2010, 12:04 PM

ok guys, i know this may have been done in the past but i need to fix a problem that i have, i have considered going twin scroll (and that may be an option) but i need to get the boost going about 500 or so rpm lower in the range!

The car is a 2.5L MY08 wrx and the mods are as follows

GTPS02TM turbo
Process West TMIC
Turbo XS tbe
Verso Tune

I am actually relatively happy with the power and torque but it just seems very very late in the rev range and would really like to get it down!

Is there something i can do with cams or something (given both sides are variable on the MY08 i have no idea?)

Any suggestions would be greatly appreciated

BALISTC · #2 28-09-2010, 12:11 PM

- IHI Twin scroll
- Coat and wrap everything
- 08 STi manifold and intercooler (better than the bar and plate PW cooler).

RUSSGT · #3 28-09-2010, 01:00 PM

Quote:

Originally Posted by BALISTC

- IHI Twin scroll
- Coat and wrap everything
- 08 STi manifold and intercooler (better than the bar and plate PW cooler).

Still havent seen proof of that.

fatboy · #4 28-09-2010, 01:16 PM

Quote:

Originally Posted by RUSSGT

Still havent seen proof of that.

Me either and the fact that the cold side of the intercooler was freezing after 3 runs yesterday i would say that it is working just fine (so i can cross intercooler off t6he list!)

here is a copy of one of the dyno sheets

Kato · #5 28-09-2010, 01:24 PM

Quote:

Originally Posted by RUSSGT

Still havent seen proof of that.

Still haven't seen proof that the PW TMIC is better than the STi TMIC too. Which was promised when they were first made.

Tbh, it makes sweet f.all difference in the applications most people are talking about. I'd be willing to bet both will act the same, which is why there is no 'proof' that one is better than the other.

The dyno plot looks laggy as hell. Have a talk to ASG why they are only running 16psi and if any gains can be made in the AVCS timing.

Otherwise try a standard STi turbo (IHI), look for a smaller housing for your turbo, replace cams, headers, manifold etc etc etc

RUSSGT · #6 28-09-2010, 02:36 PM

Quote:

Originally Posted by BALISTC

It's physics.

Tube & Fin cores have better external aerodynamics than a bar and plate core, the external air flows around the tubes better. The internal air cools better, which means its denser.. which means less lag.

That being said, bar and plate suffers from heat soak less, due to its heavier construction, and internal surface area is larger which generally means less pressure drop through the core..

Its splitting hairs in a street or mild (>400WHP) application, but just FYI, the 08 STi TMIC has a massive surface (9,600 fins just on the surface layers on the front and back, not including the internal fin area), is cheap, and is worth giving a shot to see if it works better..

Either core needs a very good water spray setup to maximise the efficiency of it.

I'll be trying this shortly and I'm hoping for some decent results

Yeah i too cant see any gains to be had from switching.

Quote:

Originally Posted by Kato

Still haven't seen proof that the PW TMIC is better than the STi TMIC too. Which was promised when they were first made.

Tbh, it makes sweet f.all difference in the applications most people are talking about. I'd be willing to bet both will act the same, which is why there is no 'proof' that one is better than the other.

I just wouldnt stuff around changing the TMIC for maybe 2rpm difference.

Also which is which with the graph you posted?

Kato · #7 28-09-2010, 02:43 PM

Quote:

Originally Posted by RUSSGT

Yeah i too cant see any gains to be had from switching.

I just wouldnt stuff around changing the TMIC for maybe 2rpm difference.

Also which is which with the graph you posted?

No, if you have the PW, no point changing.

Red line is a GD spec TMIC, lower blue line is PW.

mattmy99 · #8 28-09-2010, 12:15 PM

Td04

nauli · #9 28-09-2010, 12:18 PM

Talk to your tuner...

Mister Two · #10 28-09-2010, 12:20 PM

have you got an image of the printout of your dyno run?

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