Thats cool. That damn install kit is alomst 300 dollars. So lets think, 30 extra mins.......$300? You made the right choice. Good time too, I cant wait until i am deeper in the 12's.

 

also, don't you have a flash? im sure whoever flashed your ECU got rid of the MAF cut.

 

I was referring to pre-flash, when I ran 12.01. My SAFC delayed fuel cut indirectly by fooling the ECU into thinking less air was crossing the MAF while I was running 24-25psi and hitting those low 12s. Just an example of how the ECU has no idea what boost we're running.

 

yes, true. but you were tricking it by pulling voltage. stock ECU(with no MAF tricking devices), will yank fuel if you hit the voltage(whatever it may be) that equals 22-23psi for a period of 2 seconds.

 

then that's why you didn't hit maf cut.... you're really beatin' around hte bush on this one... fact is that the ecu calculates boost... it doesn't measure it.

with that said i don't know what calssifications bring on the cut but tricking hte maf is certainly a maf cut defenser.

 

Nad1370,


After reading your post I would have to say don't panic. Your new times are pure indication that your new upgardes are completly are of phase and that they need a tune really bad.

As you can already see the 2MPH trap speed increase does not correspond to a much larger turbo plus intercooler upgrade.

You key here is the tuning. From previous experiences a big turbo and big intercooler can hurt you more on the spool up consequently affecting your times on the same note they also help for stronger top end.

Get yourself together and have the car retune, my last tune with a big turbo on a WRX the tuner was able to reduce my turbo lag by an astonishing 800rpm sooner and he got me 69WHP on a Dyno Dynamic Dyno.

I rolled in with 211WHP(with a lot of mods) and rolled out of the dyno with 280.3, that was just pure tune. I am confident that you will improve your times and trap speeds significantly after the tuning.

Thanks for sharing your history.

Carlos

 

Uh, I know that's why I didn't hit fuel cut - you quoted me explaining it. What do you mean I'm beating around the bush? The ECU doesn't know boost. Whether it tries to calculate it or not is irrelevant. It cuts it at a certain MAF HZ level, and that airflow is reached at all different boost levels depending on the situation (air density, mods, boost).

 

No problem on the history WRXtoEVO.

I just want everybody who reads this thread know were I'm coming from in my mod path.
As for panicking....I'm not at all.
I know all I need now is a really good tune. And it will have to wait next month.

I just wanted to post my experience since no one has on this turbo with just average bolt-ons and pump gas. No alky/meth, stroker, race gas, ect...

If I ever get it tuned I will all let you know what the outcome is.

But until then.....Phillippines here I come !!!
.

 

The characteristics of this turbo is that it gives modest top end (10 - 15 whp) gains on pump gas boost levels 21-23 psi. On race gas the gains are much larger when the boost is raised to 28-30 psi with the timing ramped up accordingly.

And this is what I've always told people who come into my shop asking for advice.

This isn't a miracle silver bullet turbo. This is a bolt on ($1000) solution for people who have exhausted their options and want more hp without moving to a bigger GT turbo ($4000+). For people who want the quickest spool and the most tq a TME will suit them better. But throughout the years we have already seen what the TME is capable of top end wise and 1/4 mile wise. The 20G EVO 9 both 5 and 6 blades true potential is still yet to be seen as no one other than buschur has been pushing them hard at the drag strip.

 

you just said what i wanted you to say 'for clarity's sake'

and yes the ecu doesn't know boost hence why i said it calculates it, with this piece of information people reading can figure out that the maf cuts for a factory turbo and a factory tune at a certain boost level which is what the other person in this discussion was referring to.

also... i don't think the air density has anything to do with the hz levels that part would be a bit of what the ecu calculates with its temp sensors. the maf can't measure density or temperature from what i understand, it measures some amount of cooling events across the hot wire and then in this way infers an amount of air through some calculating.

 

and to everyone saying he needs a tune badly:

if he already has a custom tune on there, another tune after adding this turbo isn't gonna effect him much. if his AFRs are on point, and he can add boost....a tune is gonna be a waste of 300-400 bucks, ESPECIALLY if he gets tuned with an ECU flash on pump gas.

only thing a tune MIGHT do for him is add a tiny bit of torque in the midrange by adding a very small amount of timing where this turbo spools a tad bit later. no significant changes will be made to his tune because he added this turbo.

 

My results prove differently.

The 6-blade 20G apparently caused excessive backpressure in the exhaust, which is why raising the boost beyond ~23psi in the midrange resulted in NO additional torque, and despite holding 3 psi more at the power peak, created NO more hp than the TME did at less boost pressure. This is indicative of a pressure ratio problem due to poor match between the 6-bladed 20G compressor and the turbine wheel.


TME curves in RED
6-blade 20G curves in BLUE

 

I have the WR and use AEM for engine management. After installing the WR (had a stock 03 turbo before) I had to add 15% more fuel to maintain my A/F target running the same boost levels. I am using AEM to control boost and lost NO spool. This is factual information based on AEM logs sampling at 250 times/sec.

The AEM road dyno shows a solid 30 hp gain, most importantly in the upper rpm range where the stock turbo falls off.

Don't confuse the inferior 6 blade turbocharger.com wheel with the FP design, there is no comparison, Buschur (with the help of FP) finally proved this using scientific methods. FP has been around for a while, they make the best hybrid turbos for Subarus and have a very loyal following in Subaru land.

Ted B, I strongly suggest taking Buschur up on his offer to swap the wheel at no charge.

 

FWIW., D.B. and I have come a mutually agreeable arrangement.

 

this is good stuff keep it coming