A street ported 20b. 3mm seals. Stock twin turbos. non-seq. Full 3inch exhaust. ECU stand alone. M2 large IC. Anyone have a guess on what the wheel horsepower would be?

 

Depending on the porting and tuning, you might get 400 to as much as 450 rwhp. I doubt that you could get much more, since you'll be limited by the capacity of the stock turbos.

 

Attila the Fun, is bang on, you could see as high as 400
at the wheels, but power would drop off fast over 5000rpm
as the turbos run out of volume, this is what I am seeing,
I don't think I am making 400hp but have found that
the turbos just cant keep up the boost over 5000rpm.

Matt

 

thats exactly what i'm seeing too, boost drops off after 5500rpms

mike

 

Hey guys! If the stock 20b turbos are running out of volume like this, why not have BNR upgrade the turbos to stage 3 spec? I asked if it was possible a couple months ago and he said yes. This is my plan for a future 20b conversion(big power less fab work).

 

what kind of money are they charging to do the 20b's
turbos?

matt

 

I fix my problem with losing boost over 5000rpm. In each turbo line put a non return valve there so it holds the pressure and can't come back.

 

I assume what you are talking about is a check
valve? and if you pointed the check valve toward the
turbo wouldn't that cause it to become uncontrolled?

matt

 

Hmmmm I never asked the cost! I could only assume it would all depend on the condition of the turbos being sent in.

 

I have two sets that are perfect

matt

 

Put a regulator in the middle.

 

I like what I hearing. It looks like I'll have to expose my almost limitless ignorance, though.

Who or what is BNR? Contact info? Location? Is the stage 3 spec available online? Approximate cost? Turnaround time? Real turnaround time?

TIA,

 

I love a cheap, simple solution. Having seen the other post about putting a regulator in there, I'm wondering if you have a webpage with more detail. If not, would you post specific part names and numbers? It's so much better to install something that has already been tested.

Also, how high are you boosting?

I was under the impression that pressure wasn't the issue as much as volume. IOW, the motor could suck it faster than the turbos could pump it.

Out of curiosity, have you (or anyone else reading this) tried going non-sequential?

TIA,

 

I'm running 15psi,

The valve you can get from any old 13b engine or from a 20b old line you have taken out.

The valve is white and green. I will try and get a pic of it if you don't know what i am taking about. Make sure you put it in the right way. the air flowing to the turbo.

This is my webpage but still working on it
www.can-saf.com

 

And you can maintain 15 psi all the way to redline in all gears? If so, I can hardly wait to try the modification.

No, I don't know what you're talking about. Being lazy, I let the pros do the work on my car. With a good picture, I'm sure they'll know what to do.

Nice webpage. The many pictures of your 20B install would be really valuable to the do-it-yourselfers here.

The modification to the front bumper was nicely done. I had been thinking about opening up my front end for more airflow, though not as much as you've done. I'll have to re-think that, now that I've seen yours.

Thanks,

 

BNR supercars. A search on BNR stage 3 should get some results. As far as I know these stage 3 turbos are only available for the 3rd gen. Rx7store stocks them and are capable of 450+ rwhp on a 13b(full mods of course). They are suppose to be so efficiant that the turbos themselves will flow that much more volume with lower intake temps with super fast spoolup(less heat,happier engine,longevity). Right now a couple of guys in the 3rd gen section are running them. I forget his name but he has dynoed with about 437 rwhp at 17 psi non sequential. And thats with the turbos just barely getting into there efficency range. WOW!!! I think the 13b set go for around 2,200(can't remember).


My idea with the 20b turbos is to have BNR rebuild a set to stage 3 spec for my future 20b project. If these turbos are so effective on a 13b, just imagine there potential on a properly built 20b(think big single performance without al the fab work with custom manifolds and less turbo lag).

 

Are you talking about the one-way check valves?

 

Yes

 

I know what you are talking about but am a little unsure
as to where you are putting the valve.
my car is no where close to me at the moment so I cant
even go and look to get an idea

matt

 

I will try and take a pic today.

 

The search led me to a website for Gotham Racing. The advertised price is $2150. The page implies that that is the price for a _pair_ of turbos, but it doesn't explicitly say so. So far, it sounds very interesting. Thanks for the lead.

Minor issue: Our second turbo is an HT-10, rather than the 3rd gen HT-12. Have you talked to BNR about the cost of an upgrade for that? Since the parts and specs would be different, I'm betting they'll want more money. I won't be upset, if I'm wrong though.

On a a mailing list to which I subscribe (RXTech), BNR was mentioned. However, the link given for them returned a 404. Do you have any direct contact information?

TIA,

 

i think we can say that we know, on the bonzai cars pettit takes the stock ht-15 and ht-10 of the 20b and puts an ht18 from an fc and an ht12 from an fd in the stock 20b housing. that prolly makes a huge difference

mike

 

Yeah, I talked with Cam a little bit about that, though we didn't go into a lot of details. I'm guessing that the HT-18 and HT-12 innards had to be clipped in order to fit. Right?

 

i dont know, i would imagine so, although they might machine the housing too

mike

 

I'm pretty sure these turbos would cost a little more to upgrade. However it wouldn't be any were near the cost of a single turbo and custom manifold. When I said search, I ment on this forum. Try "BNR" or "BNR 400+". The latter is the original thread. SPO autos has a set and dynoed with 470 rwhp at 17 psi. Ohhh the possibilities of these on a 20b!