n00b questions

Cliff2.2 · Post by **Cliff2.2** » Wed Oct 20, 2004 4:48 pm

Don't know a whole lot about the Legacy Turbo, so I've been searching the past couple days. Still have some things I'm unclear on though.

Turbo upgrades:
What supporting mods would I need for a 16G? (intercooler of course, MBC, fuel pump?, FCD?, Engine Management?)

Supporting mods for VF23? (same stuff?, do I need to fabricate custom inlet/outlet hoses?)

Heard the stock turbo runs out of steam at higher RPMs, would the TD04 flow better at higher RPMs?

Would the Saab 900 intercooler be enough or should I go with the WRX one (how hard is the install of the WRX one?) I could get them for the same price.

Exhaust: Looking at buying used/cheap DP and having a custom midpipe made and possibly keeping the stock muffler for now. Do I need an uppipe? What mufflers bold right up?

morgie · Post by **morgie** » Wed Oct 20, 2004 5:02 pm

>Turbo upgrades:
>What supporting mods would I need for a 16G? (intercooler of >course, MBC, fuel pump?, FCD?, Engine Management?)

Intercooler, MBC to raise the boost a bit, FCD if you plan going over 12psi.

>Supporting mods for VF23? (same stuff?, do I need to fabricate >custom inlet/outlet hoses?)

same as 16G, but with custom inlet.

>Heard the stock turbo runs out of steam at higher RPMs, would >the TD04 flow better at higher RPMs?

Nope, there is not a big improvement in flow between the two

>Would the Saab 900 intercooler be enough or should I go with the >WRX one (how hard is the install of the WRX one?) I could get >them for the same price.

The "10 rays" (high-perf) version of the saab might be cool. 15 ray one may be restrictive a little..

WRX intercooler may cause you problem with : A/C hoses, to large to clear the firewall, interfere with Prestone bottle hoses.

> Exhaust:
>Looking at buying used/cheap DP and having a custom midpipe >made and possibly keeping the stock muffler for now. Do I need >an uppipe? What mufflers bold right up?

I had a custom DP made for 100$CAN. No need for a uppipe since it does not have a cat in it. If you get a custom midpipe, why you worry on "bolt-on muffler" ? get anyone you like fitted in place!

good luck

Cliff2.2 · Post by **Cliff2.2** » Wed Oct 20, 2004 5:30 pm

Does the Legacy Turbo throw a CEL once you put on a catless exhaust?

morgie · Post by **morgie** » Wed Oct 20, 2004 5:36 pm

nope

you only have 1 02-sensor for cruising optimisation only.. no "emission control"

Brat4by4 · Post by **Brat4by4** » Wed Oct 20, 2004 5:52 pm

You need engine management to properly utilize any of the listed modifications.

The turbo and injectors run out of steam at pretty much the same horsepower level. So if you upgrade one, you will need to upgrade the other to be safe.

The downpipe and the stock muffler are the 2 first things you want to replace in the stock exhaust. DP is the #1 restriction and the muffler is #2. Any magnaflow, brullen, glasspack, turbo muffler, or coffee can muffler can be made to fit pretty easily at a competent muffler shop.

-K- · Post by **-K-** » Thu Oct 21, 2004 12:27 pm

DP would be the first thing. Stock muffler is crap, replace it. A 2.5in crush bent pipe from the turbo all the way back should do you a lot of good for not too much $$$. Get a muffler that you can look straight through. If you plan to get all crazy with power go 3in, some people here have got WRX stuff to fit with little modification.
The WRX intercooler will take some work to get in. I wouldn't waste my money on a Saab IC, it's not worth the work to put it in with a turbo like that. Save up if you have to but do it right.

dzx · Post by **dzx** » Thu Oct 21, 2004 2:37 pm

I wouldnt worry about the uppipe but you definately need to upgrade the exhaust before the turbo. Previous owner had a n/a legacy muffler on my exhaust before i upgraded it. Try an Invidia downpipe and 3" stainless steel exhaust. K&N or some other performance drop in filter at the very least. Diamond coil pack wouldnt hurt. Walbro 255lph fuel pump. Stock ecu will work, just not as efficiently as a stand alone.

Cliff2.2 · Post by **Cliff2.2** » Thu Oct 21, 2004 3:30 pm

Thanks for all the replies. First mod looks like it'll be a turboback.

Brat4by4 · Post by **Brat4by4** » Thu Oct 21, 2004 4:10 pm

If you can find a used WRX one for $3-400 or less then that is great. You can get new turbobacks for around $600 now. Don't fret over the dp design, you are talking a handful of horse either way... unless you plan on pushing a whole lot of horse later on, but even then you can always change to a different dp.

BAC5.2 · Post by **BAC5.2** » Wed Oct 27, 2004 4:05 am

It's not just power, it's exhaust velocity.

Good velocity capacity allows for large intake capacity. Plus, increased spool time, which is always a plus.

Bellmouth designs allow boost creep, and that's bad.

-K- · Post by **-K-** » Wed Oct 27, 2004 3:08 pm

OK let's get this straight: Some bellmouth dp's will cause boost creep. Some of it is the design, some of it is how much boost you're running, some of it is what the the wastegate comes set at. A weak wastegate actuator is the main reason for boost creep.
I have a bellmouth dp with no boost creep. I like the split dp idea but a bellmouth seems to be just fine for most people.

legacy92ej22t · Post by **legacy92ej22t** » Wed Oct 27, 2004 3:11 pm

*Warning Off Topic*

Hey K, are you home now? If not, how are you making out over there? Hope all is well.

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n00b questions

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