Isn't that clear enough?

 

Yes, those parts could stay stock but it would be dumb to upgrade the turbo and not upgrade many other parts first.

David Buschur
www.buschurracing.com

 

8500! That's awesome! Free bump for catching me off guard.

Jeff

 

a mod going ot.haha

 

Please hurry up with your testing. I think My turbo is on its way out; im getting a rattle when reving in the higher rpms or really hard driving up top when I let of the gas.

 

I will try and get back on the car next week.

David Buschur
www.buschurracing.com

 

sounds like detonation..........

 

At least in my S4 the turbos sounded like a drill when they started to go.

 

Seeing as I dont have many mods on the car; just exhaust I dont think its detonation. Could be anything but Im assuming its the wheel hitting the side of the housing. I have had this happen before on my GST. a couple months later it started whining.

 

The 21G turbo is on the car. Nothing like the CNC'd wheels we tried in the past. This wheel works. It changed the AFR's by quite a bit, meaning it is moving more air. The spool up is very very close to stock.

I did the datalogs at lower peak boost pressures than I was hitting with the stock turbo. I had to, as this turbo holds boost longer and there is no way the car could live with very high sustained boost levels on 94 octane.

This 21g on race gas/alky mix is going to be a killer combination as it holds more boost at redline than the stock modified turbo I have on my car now.

The 21g I am running is an unclipped turbine wheel. I put it into my ported 10.5 turbine housing.

I wish I had the new AWD dyno in so I could do some real number testing.

This turbo being larger than the stock one compressor surges if you try to pull from too low of an RPM. This kills the time it takes to do a pull on a datalog.

I do not care to sell something that doesn't work. I am sure this is going to work and make more power than stock.

Here is the only good pull I could compare from. This is going to give you guys an idea of the potential of the turbo.

I started this pull on the stock turbo in 4th gear at 2,000 rpm. Doing the same thing in 4th made the turbo compressor surge so it ruined the run. What I did was clip the datalog down and compared from when the surge quite to 7,000 rpm.

Stock turbo, ported and clipped.
4031 rpm, boost spiked to 28.6 psi. It took 5.49 seconds to accelerate to 7,000 rpm/115 115 mph. Boost at 7,000 rpm was only 17.7 psi.

21g turbo, ported no clipping.
4035 rpm, boost hit 23.2 psi. It took 5.22 seconds to accelerate to 7,000 rpm/115 mph. Boost at redline was 19.98 psi.

Running the stock turbo I see very high spike the way I have the car set up. As you can see 28 psi peaks to fall off to only 17 psi at redline.

The 21G, if you hit the throttle in 1st gear like you were doing a run, the boost stays extremely steady. Looking at a datalog for a 1-2-3rd gear pull the boost in 1st was a flat 19 psi, 2nd saw a peak of 19.8 falling to 19.07 and in 3rd peak boost was 20.3 falling to 19.3 psi.

This is impossible for me with the stock turbo. I see 28 peaks down to 17 psi at redline.

Very very nice. This turbo is going to make a large impact.

I'd like to get the car to track if it ever stops raining and snowing here. It would be a good comparison to the stock one that ran 11.7 at 116 mph.

Good stuff. We are ready to take orders.

David Buschur
www.buschurracing.com

 

will this turbo hold a sustained 25 psi??????

 

how will you remedy the compressor surge?

 

price?

 

Are you guys getting an all wheel drive dyno? If so, what type? How soon?

 

I can't wait to see some real numbers! Did you get a chance to take the car out on the street yet? How does it feel?