Do these turbos already come with the wastegate ported?

With Ceramic coating on the turbo manifolds, anybody have it? Does it really prevent cracks?

 

I have BNRs and I ported the wastegate and had the coating done after I did all the porting and blocking for the richman non seq .But that does not answer your question .Call Brian your self instead of getting second hand info .PHONE 205-640-1193 . I have a one off set built by Brian and with all of his work and mine work on them ,they rock . His service ,for me, has been great and I will go with him for my turbo needs .I have had him do some work for my customers ,always with grade A results .

 

There was a discussion a while back about ceramic coating on the manifolds. I won't prevent cracks as it doesn't change the metallic properties of the manifold, it only adds a coating.

 

Has anyone had problems with boost creep on the BNRs? I know the wastegate is ported, but wasn't sure if it was enough to stop creep with the higher flow rates.

 

I had mine changed to a larger one while he was building them, I think he said 35mm if I remember right... was a few additional dollars but thought it was worth it.

 

I run 15 psi on Stage 3s with full exhaust....no creep whatsoever.

 

while I agree ceramic coating will not prevent cracks, it should extend the life of the manifold significantly, plus the important added benefit of the thermal barrier....strongly recommended by experienced tuners such as Brian Cain...in short, don't be a cheap ***, go do it

this sounds like another classic mahjik, "it's not needed because it's not on my car"

 

on crappy CA pump gas??

 

Rich reportedly has a little creep

I'll have mine going within a month or two....but Garfinkle did the porting and ss flapper

 

Nope, if you think I didn't have the "money" to do it, you are sorely wrong. While it is a heat barrier, the metal properties don't change. Any temps that will melt or damage the metal can and will still happen. The barrier helps "lessen" the amount of heat it can absorb, but prolonged temps above what the metal can take will still stress it, crack it and/or damage it.

 

The coating would simply cause the part its on to absorb/dissipate heat more slowly. This would potentially reduce the risk of cracking due to drastic/rapid heat cycling but it would not reduce the ultimate temperature seen by the part and so any cracking caused by overheating would be relatively unhindered.

 

The question as asked: Does this prevent cracks?

The answer is no. It can slow down the heat aborbtion but as I said, the metal properties of the manifold remain the same. If it takes X temperature to start breaking down the metal, that temperature will remain the same after the coating. This may in a round about way slow down cracks, but it doesn't prevent them. That can still happen.

However, the coating can reduce the amount of heat the metal absorbs (to a point). That makes it withstand a greater "ambient" temp, but the metal properties are still the same.

Think about it this way: If you use some of those thermal hose coverings, that doesn't change the properties of the rubber hose it's covering. Once the melting point of the rubber is reached behind the coating, the rubber will melt (or get damaged).

 

I agree with this 100%.

And BTW as far as wastegate porting I haven't had a problem with mine creeping. He will give you a larger port if you want, just tell him when he does the turbos. I'm sure it cost more but he was doing it to one guys when I went and picked mine up. I think he takes a flapper from somthing else and replaces the stock one so it will still close fully.

 

The majority of cracks in cast iron occur due to a drastic and rapid heat cycle. The iron is really hot, it cools too fast, it cracks. The ceramic coating not only keeps heat out, it keeps heat in the manifold. So when you turn your car off your manifold is going to maintain its temperature longer. This coating is a thermal barrier. Cracks caused by an overly dramatic heat cycle will be reduced signifigantly.

The cracks you are suggesting are caused by exhaust temperatures so high that the cast iron looses its structural properties and cracks due to the inherent forces of an engine. The thermal barrier will not stop this. It will take longer for the manifold to achieve the same temperature of the exhaust gases but the difference would be measured in minutes and not hours. The thermal barrier will not signifigantly reduce the peak temperature of the manifold. The metal is weak from being too hot. The stress cracks the manifold. I have never seen one of these cracks. It would most likely be centered around one of the bolts/studs in the manifold. But this type of crack will not be mitigated by the coating nevertheless.

 

Steve Kan tune....rich (~10.8:1 AFR) with conservative timing. My knock sensor readings seem pretty reliable -- and under WOT at 15 psi, my knock reading is 15-20. Once I get my water injection back up and running, I will also be using that. When I track the car, I always run 100 octane.

I fully expect this engine to last at least 60k miles.

 

damn I hate statements like this

 

Reduce, maybe. But, as the question was asked, it will not prevent cracks.

 

you can't afford it, otherwise you wouldn't still have a Pettit ECU

just kiddin chief, chill

 

Kind of sad, isn't? Especially considering the conservative tune+water injection. Of course, beating on the car for track events takes its toll.

But then again, I don't see many engines of any type/brand making over 50% more HP than stock lasting 150k miles.

EDIT -- Besides, now that my FD is no longer my daily driver, it's only going to see less than 5k miles/year. At that rate, 60k mile engine life = 12 years. I can live with that!

 

So.......anyways BNR's do come with the wastegate ported but still not enough to prevent creep?

 

They come ported, you won't get creep.

 

I think the problem with my last set of BNRs was the Greddy profec B spec 2. I had creep pretty bad with those no matter what the gain settings.

 

Do you think it had anything to do with your setup? did you go with Ver 1 or Ver 2 for the boost controller set up?

 

Hey all.

I do port the wastegates to 30mm when I rework them. I sometimes offer people 35mm wastegate ports to those who already ported the wastegates but went too far porting or for full blow race cars that need it for road racing or whatever. I charge more for the valve assembly and labor for porting but other than that it is a pretty good idea and won't hurt. I hate to get more expensive but if people insist I will do whatever makes them happy.

As for turbine housing cracks. Coating them won't help longevity. Where the problem starts is on sharp corners. The port corner is the first part to expand and contract under thermal loads. It doesn't matter how new those housings are or what material it is made of or if they are coated they will crack with just a few thousand miles. The cracking doesn't effect the turbochargers like you think it does and it is really just an eyesore. But cracking can get rediculous . I suggest if you use a turbo, get a set with under 50-60K miles. 90K+ sets are cracked too much in most cases. The only thing that can be done is radius the sharp corners and it will help the most.

Bryan@BNR
205 640 1193
www.bnrturbos.com

 

Can't believe I missed this thread, lol.

YZF/Improved, the Mahjik man has a ceramic coated seq manifold that he bought from me, kinda funny to witness the exchange between you two

A great link that will answer most questions on Bryan's turbos:

http://www.bnrturbos.com/3rdGen.htm