I think people's expectation on this turbo are somewhat unrealistic. You are not going to gain that much HP with this turbo on lower boost levels. A brief trip to turbocharging theory can tell us why:

An engine can only suck in so much volume of air. In a turbo like the stock EVO turbo or the FP WR, the compressor is already filling the engine with this max volume at lower boost levels (as evidenced by the fact, that lower boost you don't have boost drop off). If a motor at 20psi can only injest 500cfm of air, putting a 500cfm turbo, or a 1000cfm turbo will make NO different at 20psi, if the IATs are the same. Now, a better compressor will get you one thing: lower charge air temps. However, the stock evo turbo is already pretty decent in that regard, and we have nice intercoolers which keep our temps near ambient (well, most people). So the restriction is in the turbine side. If the turbo at 20psi is not dropping boost, and your IATs are already close to ambient going from the stock turbo to the FP WR at that boost level is not going to get you much HP. The rest of the power comes from reducing pumping losses due to back pressure from the turbine wheel. Now, both turbos use the same turbine so you aren't getting any reduction in back pressure at all, hence I would not expect tremendous gains at lower boost levels (but would expect some due to reduced IAT).

Where the FP WR makes power is at higher boost. Its no secret the stock EVO turbo runs out of compressor at higher boost. Now the FP WR being able to flow more air from the compressor at higher boost, it should provide more power at higher boost levels.

There is no magic, there is no escaping physics and thermodynamics. Hope this somewhat clears it up.

 

I 100% agree with racegate on this. At 22 psi I am probably only seeing 30 HP gains from my GT35R from Buschur Racing. That is almost all from having better flow through the much larger exhaust housing. Does anyone doubt that the GT35R will make more power at race gas boost levels than the stock turbo? Nope!

I suspect that the WR will give minimum gain to people running pump gas day to day, and it will wake up and tell you who is who and what is what on race day with some C-16 in the tank!

If anyone takes Dave up on his offer I would like to see the dyno runs as follows:

Stock turbo at 12 psi (wastegate spring pressure), 15 psi, 20 psi, and 22 psi. on pump gas. Then put in some race gas and do some runs pushing it to the limits and record peak boost at the initial spike and what it drops to by redline.

Then pump out the race gas and put 93 octane back in the car and do the whole thing again with the White Rabbit. See what the power differences (if any) are at low boost levels and find out what boost levels the WR is able to support without boost drop off.

Just my take on things.... I have confidence in Forced Performance, and I would love to see a real world test of their newest product.

Keith

 

Great ideas fourdoor

 

Oh, about my test method above.... do a pressure test of the system with the stock turbo, and then after the WR install so nobody can say that the car had a boost leak stock so the basline numbers were low making the WR look better than it really is.... or say that the car developed a boost leak after the WR install and we are a bunch of buttholes trying to make the WR look bad.

Keith

 

^^^^This was after me and ben running

I personally was very impressed with the WR bolt on turbo. With my mods and my old tune, Ben's WR pulled me everytime we started from a low RPM. I seemed to be catching up, but the spool up on the WR is highly apparent, and strong as well. From a higher rpm, it definately showed that my 3071R needs the room to extend it's legs, as the spool up on the WR was not as evident.

The WR definately is producing some visual and seat of the pants gains over a stock turbo, and looks stock as well. I hope that this produces the dyno gains everyone is expecting!

BTW I was running some 10.1 to 10.3 afrs thoughout the spool up. High fat content.

 

To the people backing this WR up because they decided to buy one I have a question...you're running the 10.5 hotside now, did you have it BEFORE the WR? If not, those small gains you're talking about might just be from adding the hotside. If you already had the 10.5, I guess all the money you spend on the WR really did get you a whopping 20-30WHP. I still think this turbo gets a from all the hype it had prior to actual testing.

 

If we get taken up on the dyno offer, which as usual we probably won't as it seems people don't want any actual results.

I will test the stock turbo with the best tune we can put in it at 20 psi on pump gas. Then put race gas in the car and test again at 25 psi.

Then install the WR, test on race gas at 25 psi and then put pump back in and test at 20 psi.

David Buschur
www.buschurracing.com

 

Yeah, clearly this turbo has become a victim to the hype surrounding it. A real world "bolt it on and tune it" test would do the entire community a service.

I'd love to see a comparision of the WR to the BR440 while you're doing back to back testing.

 

The only thing that is free is the dyno time correct. How much is tuning (flash), installation, etc cost? Someone who already bought a WR turbo jump on this!

 

I assume it will be a stock 05 Turbo

 

It'll be stock for whatever year car shows up I'd assume.

 

I would agree that the year of vehicle for the stock turbo will not matter since this is a ABA comparison. The mods however will need to be specified which I believe it was.

 

ITs really too bad Dave's shop is so far from me.. I have an 03 turbo on my car, I have a TME turbo in a box, I will have aquired an 05 turbo in a few weeks, and I wanted to get my hands on a WR.. I would have brought all of them down to test, I may do that locally if I can get the money together to pick up a WR, but I will be "Hopefully" doing a full review of the turbo comparing it to a stock turbo on an 05 RS if things go well, Unfortunately I don't know the timeline but it will hopefully set things to rest. The car will be getting a *****-out tune and he is looking to push the envelope.. But I'll post more on it as I talk to my friend and findout his timeline.

 

Jack

If and when you make it down here to Texas, there will/is plenty of canidates for these type of tests. My buddy down the street has a bone stock evo with just a WR and a cut-out. Other houston members have everything from stock to ***** out setups. I know that each car is different, but the 'base' is close. I still need to get to the dyno to do my review on the ever hated atp3071R .

 

Which is what should have been done in the first place. Obviously this sort of testing process will yield much more credable and significant data than a "hail mary" bonzai dyno run.

Sadly, though it seems that inflated and misleading numbers and claims are all that resonates with some of the consumers.