Edman951

I want to get a custom turbo built by a local turbo rebuilt shop in my area,because since the money exchange rate is so bad.Canada$-US$
To give you an idea,if i buy a SFR stage1 turbo
it would end up costing me a good 1700$ with shipping and duty fees.
I can't afford that if you ad all the other stuff i need to build a 325rwhp daily driver.

So i bought a k26/6 core and i want to get it rebuit using garrett compressor housing,wheel and center section if needed.
I want it to have extreme boost response achieving full boost around 2500-3000rpm and a max of 325-345rwhp. My REAL goal is 325rwhp.
I know most of you are looking for 400rwhp turbo's but for me 325rwhp is plenty for the street
Please help me find a good compromise!!!
All info will be very helpfull
Thanks

TonyG

Not going to happen with the boost coming on that low. To spin up a turbo with the max boost coming in 500 rpms sooner than the K26/6, you're going to give up flow potential.

The thing most people forget about is the RATE OF SPOOL. This is different than when you reach maximum boost when you floor your car at 25 mph in 4th. gear and wait for the boost to build to its maximum. Doing this, gives the turbo a long time to build boost. What I'm talking about is how fast the turbo itself accelerates. To get a turbo to spool up that fast, and at that low of a rpm, you're going to need a pretty small turbo with a small exhaust side and a small compressor wheel (less inertia).

The stock K26/6 accelerates pretty damn fast and can make 275HP+ to the wheels.

You have to make up your mind ... quick boost, or big HP

Edman951

[quote]You have to make up your mind ... quick boost, or big HP <hr></blockquote>
I thought i did make my mind
Since i'm looking for a max of 325rwhp whitch is considered a stage 1 for most tuner, i don't think i'm asking to much when i want fast spool and 325rwhp.
Just look at <a href="http://www.speedforceracing.com/Turbo.html" target="_blank">SFR stage 1 turbo,</a> he says it will spool at 2500rpm and is considered a mild turbo.

TonyG,do you really think i'm asking for to much?
What do you suggest as a good comprimise ?Thanks for your advice.

[quote] The stock K26/6 accelerates pretty damn fast and can make 275HP+ to the wheels. <hr></blockquote>
Maybe then my k26/6 is getting old because it does'nt really spool fast. I get 10psi in 1 gear at 3800rpm. Maybe it's because i drove to many modified vw 1.8T and i got used to the fast spooling.
Keep the advice coming <img src="graemlins/bigok.gif" border="0" alt="[thumbsup]" />

TonyG

The first thing that really affects rate of spool and when the turbo actually builds its maximum boost is the wastegate, then the boost controller. Next is the stock turbo down pipe, which is very often partially collapsed, thus creating excessive back pressure.

My advise is since you're on a tight budget (somewhere I thought you mentioned this), to spread y our money around to get the biggest bang-for-the buck.

If you put in the worlds best turbo, but have a weak wastegate/boost controller, collapsed down pipe, etc.... your car won't perform good.


If you really want boost down low, then I'd sacrafice top end HP to achieve this goal.

Take a look around at as many dyno sheets as you can find. These will give you a decent indication of what a turbo will function like. Speed Force, Huntley, Powerhaus, and more...even my site.. TonyGarcia.org all have lots of dyno sheets for you to look at.

Of all the sheets I've seen for 944 turbos.. I've never seen one coming in at 2500 rpms. About the fastest spooling small turbo dyno that I've seen (and that's not to say that I've seen them all.. because I've not :-), the K26/6 makes the boost at the lowest rpm.. and.. they have a damn fast rate of spool when combined with an aftermarket wastegate and manual boost controller.

Here's my "budget racer" suggestions:

Good condition K26/6 turbo (maybe have the wheel clipped a little to lighten it up even further).

Bursch Test Pipe 2 1/2" - $225
DeltaGate wastetgate - $225
Muffler Shop install of wastegate - $100
Manual Boost Controller - $50
Adjustable fuel pressure regulator - $160
ARC2 Fuel Controller - $550
Aftermarket chips (Not Autothority) - $250
K&N air cleaner element - $40
New Factory turbo to intercooler rubber pipe $???
...the above pipe always shrinks big time... and causes a major restriction in the intake tract...

New plug wires/distributor cap/rotor/pluts - $150
...you need the ignition to be in good order for sure...


Next... you should have the following..

a/f gauge - $30-$125
boost gauge - $30-$50

I'd mount them in the Huntley Racing gauge panel with your manual boost controller - $70

That's about it.

Now you'll have a car that can easily run 18 psi boost, will make a good 270+ HP to the wheels, will spool like a rocket... and a all around very quick car.

Now you've got the basics covered.. and you'd be in a better position to go to larger turbos, etc.. in the future if you decided you wanted to trade some low end/spool rate for some more top end power.

TonyG

OPPS! I didn't see your list of mods prior to my previous post... <img src="graemlins/c.gif" border="0" alt="[ouch]" />

First... is that the SFR exhaust from the actual turbo back? If so that's the setup I have except I dumped the muffler and stuffed in (3) borla XR1 stainless race mufflers to quiet that damn thing down. It's almost to the stock level now with a complete 3" ID exhaust... "they said it couldn't be done"

If so, your exhaust is done.

Is your wastegate stock? I didn't see that in your list of mods. If so throw it away. Get a real wastegate. Tials are nice (that's what I have) but a DeltaGate will work fine for 1/2 - 1/3 the price. Also, get your wastegate dump back into your exhaust. You're not gaining any HP by doing that.. just making a LOT of useless noise.

Replace the turbo to intercooler rubber 90 pipe. If it's not relatively new... it's shrunk up quite a bit.

With the mods below.. your car should boost DAMN HARD with the K26/6 turbo:

Wastegate
ARC2
Adjsutable fuel pressure regulator
K&N air cleaner element
Make sure your ignition is in good condition
Rubber 90 from turbo to intercooler
Make sure all rubber hoses/fittings/turbo intake boot are crack free (remove to inspect).

The above should make a HUGE difference assuming that your K26/6 turbo doesn't have any problems.

Good luck,

TonyG

Edman951

TonyG, those are some great suggestions,thanks.
Here are the things I plan on doing, replace fuel lines w/SS line,3bar or afpr,Custom intercooler pipe w/new silicon and T-bolt clamps,Guru Map kit,new turbo and injectors,Tial wastegate,and miscellaneous parts needed....

A local turbo rebuild shop offered me a BRAN NEW KKK stage III 8cm turbine with watercooled center section and a To4E 60 for 960USD new . He says its good for 450-500hp.
I told him it was way to big for my needs and he will make me an other offer. What do you guys think?

What the smallest turbo i can use to get 325rwhp using kkk 6cm turbine or something else??Please help......

TurboTim

If you go with a TO4B with a 46mm compressor trim(which is 14mm smaller then the reccomendation you got), stock turbine trim, a 6cm hotside and ball-bearing, you will get a turbo that can spool up around 2500 rpms and make over 300 at the wheels quite easily

keith

Tim, is that stuff small enough to be machined into a k26/6 housing? (or am I getting into left field here?)

Robby

[quote]Originally posted by TonyG:
[QB]SFR exhaust from the actual turbo back... that's the setup I have except I dumped the muffler and stuffed in (3) borla XR1 stainless race mufflers to quiet that damn thing down. It's almost to the stock level now with a complete 3" ID exhaust... "they said it couldn't be done"

Also, get your wastegate dump back into your exhaust. You're not gaining any HP by doing that.. just making a LOT of useless noise.[QB]<hr></blockquote>

Tony- I MAY have asked you about this awhile back, but- I'm looking for a nice balance b/t power and noise- I want my car to be QUIET- like a 540i or something- since that wont happen, I would still like to keep my car as quiet, if not slightly quieter than stock- I would also like to use a slightly wider exaust and maybe something like Tim's SS, as it (SFR) is one of the nicest looking ones around- did you weld the Borla's on inside the pipe somehow- Imean b/t where the cat would be and the SFR muffler, or did you completely replace the SFR muffler? How large are the Borla's- are they heavy? How much were they? Do you have a resonator of any kind? What about exaust wrap?

About the wastegate dumping back into the exhaust- what do you meant by this? Are you saying that I need to get the wastegate dumping back into the exhaust as it will quiten it down, or are you saying it will make it louder, more powerful, what?

Thanks for the input, and sorry to stray from the main topic guys....

Edman951

TurboTim, thanks alot <img src="graemlins/bigok.gif" border="0" alt="[thumbsup]" /> for the advice i will look into it.
But do you think it will still be a good combo if i don't go BallBearing? What is the max aprox. HP can that turbo hold w/o BB?
Thanks. <img src="graemlins/bigok.gif" border="0" alt="[thumbsup]" />

TonyG

Robby

I had welded 3 borla XR1 mufflers into the SFR 3" stainless exhaust. I removed the muffler that came with the SFR exhaust.

These mufflers don't fit into the inside of the exhaust if that's what you were asking... they [the mufflers] weld onto the exhaust just like any other muffler.

The Borla Stainless XR-1 mufflers are the best muffler on the market for a turbo application. They are stainless, light, have steel packing not fiberglass, are straight through, never wear out, are quite, and are fairly inexpensive (aboutr $130 each from Summit Racing).

Here's a pic of the exhaust:


<a href="http://www.tonygarcia.org/red_951_exhaust/MVC00008.JPG" target="_blank">http://www.tonygarcia.org/red_951_exhaust/MVC00008.JPG</a>

TonyG

Edman951

So i have been looking around and comparing Turbonetics compressor's and wheel to the stock k26/6 and i think maybe a T04B super-S compressor wheel with the stock #6 turbine (i think this is what Turbotim was saying in the above post) would give me more flow then stock and still spool fast.
Or maybe a T04B super-v for a bit more topend..
Any opinions out their???
Does anybody Know what is the Garrett equivalent to a k26 compressor wheel?
I think it's a T3-55 trim.....because the wheel is about the same size as a k26 compressor wheel.
Does anybody know the k27 compressor wheel induser and major diameter?
Thanks and keep on helping
<img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" />