The shop that originally made my hybrid cut off the 3" inlet of the T04b and welded on a 2.5" inlet so it used the stock TID. Their welder wasn't half bad either. It dyno'd the same as two S2000's at a dyno day so I'd assume about 240 bhp @ 8 psi. I'm not really missing anything from the reduced inlet diameter.

 

^ Nice that's good to know. What shop built the hybrid for you?

 

The first owner had it done by a shop in Maryland back in 1987. I can dig up the name, but I'd bet they're no longer around. It seems like a simple cut and weld operation, so any decent shop can pull it off.

 

just got my setup finished for now.....
-1988 10thae
-rebuilt motor with mild street port
-full rb exhaust
-act lightweight flywheel and 6 puck clutch
-all emissions removed
-custom front mount intercooler
-tial 50 blow off valve
-new rc 550cc primaries and 1000cc secondaries
-stage 4 bnr turbo,s5 manifold @15psi
-aem wideband
-safc2
-fcd
-custom tid
-walbro 255lph fuel pump
-no a/s or p/s

i should be getting it dynoed here in the next week or so. what afrs should i be after exactly?

 

 

I am gonna predict around 330-350rwhp at 15psi

 

384hp/306ftlbs @14psi boost on a BNR Stage4+ early opening streetport with stock closing.

Here is my conservative street tune 342hp@ 12psi from 2 years ago on a dynojet. I put notes on the 2 through 8,000rpm on the HP curve and notes to show the torque curve as the ignition pickup wasn't working right.


Here are the tuning plots from 12psi baseline, 12psi leaned out to 11:1 and then 14psi on a dynapack. The 12psi baseline runs peak power were within 1hp dynojet to dynapack, but dynapack doesn't put the load on right hence the late spool.

 

well the turbo decided to mess up at 10psi........i dont know if it was a bearing or what, but the intake compressor wheel is ****ed. so i think im just gonna go with a bullseye s366 now. but at 10psi it made 300whp lol

 

BNR4, small to med streetport, and 14 psi = 341whp on a dynojet? I expected more..

 

380hp @14psi as on the chart.

BNR4, small to med streetport, and 14 psi = 341whp on a dynojet? I expected more..

@me?

The dynojet 342hp chart was @12psi

The Dynapack was also 342hp @12psi then we tuned it and raised the boost.

380hp @14psi as on the chart.

I will return for a race gas tune, but we ran into an issue raising the boost. (I forgot to tighten the BOV from its softest setting). The 16psi pulls started promising- looks like ~400hp.

 

Aren't dynajets wheel hp, and dynapacks brake hp? So if you made 380 on a dynapack, you are probably making around 330whp.

 

no...

Dynapacks if anything read a little low.

Dynojets can be configured to overstate hp quite a bit, but most just measured SAE corrected whp.

they both measure wheel hp.

EDIT: I take that back, it looks like they're corrected to flywheel hp... that's odd.


BLUE TII: what's with the big dip at the end? that looks odd.... If I didn't know any better I'd say it was wheel slip, but that's not really possible on a dynapack

 

380 at 14 psi is sick though. But I thought it was 380PS not WHP

 

Ahh your right.

So Blue TII you may want to keep that in mind, if you had a whp reading from the dynajet, and a fly hp reading from the dynapack, it's like comparing apples and oranges.

 

Do more research, much more

Dynapack machines as already mentioned are known to read lower than dynojet machines even thought they´re measuring at the hubs - dynojet should read lower given the losses from tire deformation and slippage but its usually reading higher - just shows how BS dynojet numbers are in most cases...

If you are confused about writing in the top of the graph - flywheel HP and flywheel Torque - Do you actually think that it is measuring it? Just look down on TCF value. If its 1.0 then it shows what it measures - at the hubs

Where is common sense

 

The TCF is in fact 1.0, which means you are probably right about the heading; they probably just mislabeled it.

 

Amen!

This is the best post regarding dynos that I have ever seen on the entire internets.

PS my stage1/2 bnr copy does 331.5rwhp @13.5psi boost @ 7500rpm. (dyno dynamics)

 

Well I killed my BNR stage 4 last weekend. Suddenly lost boost, took the turbo off and found a missing exhaust blade!! . Dissasembled the turbo and found most of the bearings had died aswell. Not sure what i can save but oh well the thing lasted bout 10,000 k of hard track driving and drifting and pumped 17psi all day. Will post some damage pics if anyone is interested...

 

Yikes...

 

Post the pics, I'm very interested!!

 

wow, that sucks.
you can rebuild it, just replace the ptrim wheel, and CHRA if the bearings are toast.

 

BLUE TII, that's beastly! You still repping the JIC exhaust?

 

You still repping the JIC exhaust?

I have the 3 1/2" JIC Spec 90 front section on still but it is connected to a RB RevTII rear section for street stealth.

I hope to go back to the dyno soon and see if the top end is a little better without the RB restriciton.

My Spec 90 rear section is really beat up from an incident while on a friends car so it needs some work.

Let me know if you are selling or know someone selling Spec 90 or parts.

 

In the search for more horsepower i have decided to go to a bigger turbo. The BNR was great while it lasted!!!

 

Quick question for you BNR stage 3 guys. I got a S4 stage 3 last week and when installing it, I found that the water feed line doesnt bolt up the to the LIM. It is about 1 inch away from the port on the LIM. The water return line is very close to the exhaust mani. How did you all solve this issue? I was thinking about cutting the hard line and putting high temp hose inbetween the cut. I was on the impression of no modification required. Here is a pic, can you all send me a pic of what yours looks like?