return of the huge bore butterflies

[rktmn]

Here are some photographs of the HBB I designed and made about 5 years ago. I've been running them on my car ever since.

Although I am sad to say that I have not kept up the state of tune on my SHO, and just recently I changed the plugs, the HBB gave me a nice kick in the but when I first put them in.

Here are some dyno sheets:





Although I did not dyno on the same day the 2 different intakes, and I had added a larger 77mm MAF with an Optimizer and slightly ported throttle body, the increase in horsepower was noticeable in the seat of my pants, as you can also see dyno results.

I know very little about tuning, but I did a great deal of porting on the intake and some on the entrance to the heads.

Here, you can see how the size of the HBB compares to the
stock butterfly intake: The stock intake actually fits inside the HBB with room to spare.



The actual bore of the HBB almost equal the the entrance to the intakes, which measure 1.775". The HBB measure 1.750".

This is how I have the intake set up on my SHO now:



This is a view of the funneld throttle body:





The HBB'S are made from billet aluminum on CNC equipment. It is an expesive method of manufacturing for such a small run. I had offered them for $600.00 the complete set about 5 or six years ago, but everyone though that they were too expensive.

Actually if I had made these for any other car instead of the SHO, I could have sold them for $2000.00.

Anyway, I will post some more photos later.

If there is any interest, I could revive them again.

Forced Induction SHO's would probably get a big HP boost with these.

Jose

Jose

 

[yamahaSHO]

I'm not sure the butt dyno can accurately feel that 10ft-lbs of torque. My butt dyno told me one thing, but the race with another stock SHO told me another (back when I was NA).

It's hard to tell considering the scaling difference, but it looks like the torque drop off on the lower graph is a bit more than the above.

Price is a huge factor when you're looking at $600 as you can get a pretty good start on boosting a car in that range [and I imagine you wouldn't be doing HBB/BBB's without other work anyway]. For the person that wants EVERYTHING for their car, awesome... But when looking at the bang for the buck factor, it's not even in the ballpark. If I had to do it over again, I would have skipped EH and BBB's and just thrown boost on it. Sure, everything together helps support more power, but I'm already running far less power than my motor is capable of due to pulley choice.

 

[LOUDSHO92]

I would love to see these on a boosted SHO.

Can I try?

 

[1993MTXSHO]

I've wanted a set for a while, but there's no way I could come close to $600 for a set, I'd be leary for even half that. Like Jason said, the money spent is just not worth the HP increase and that's coming from a guy who has damn near every possible thing done to a n/a engine.

 

[rktmn]

Whether it is a good bang for the buck or not is a moot point. 18hp and 10 ft-lbs of torque out of a SHO is a significant amount on a NA engine.

Compared to a set of custom headers which could run at $450.00 and can be manufactured in a day's work, the HBB's take 10 times longer to manufacture. The HBB's are a giveaway.

Anyway, in a $15,000.00 FI engine build, it would be peanuts.

LOUDSHO92 if you drive down to Miami, we can swap the intakes and test it on a dyno comparison back to back.

Jose

 

[yamahaSHO]

Cost/performance is most certainly factor. Without a back to back test within the same day, I'm not sure how much you can claim the gains to be due to the HBB's themselves (they are not even on the same scale, who knows what calibration the dyno was on for each run). We're not dealing with $15,000 engines with an unlimited budget. I understand these aren't an easy product to machine, but when looking at the big picture, that money could be put to better use. As you said headers could be done for cheaper and you could even merge those into a turbo ****** while you're at it.

They are beautiful pieces, don't get me wrong. Having done just about every NA mod on the motor aside from this, I can say I wouldn't do it again. Boost or bust.

 

[HotRodKid]

The actual bore of the HBB almost equal the the entrance to the intakes, which measure 1.750". The HBB measure 1.500".

Que ? Stock housings are 1.6875 OD (give or take a bit) you have to 1.700 ID or more for that picture to work.

 

[lowc]

i like what you did with the tb

 

[rktmn]

My mistake HotRodKid.

ID for thr bore of the HBB is 1.750" .

ID for the intake is 1.775"

ID for the stock butterflies is 1.420".




Iowc The throttle body funnel makes sence.

 

[jayro]

600 is a little salty, but for a small run costum part I can understand it. If you had more accurate dyno testing (same dyno, same day,same conditions) that showed the increase it would definatly get my attention. 18hp/10ftlb at the wheels would be a pretty big jump for a single bolt on. Cams cost more and can gain about that amount of hp. Just my 2 cents

 

[shomethe$$$]

looks like you take pride in your work, perhaps getting rid of the IAC and TB cooler lines helps a bit. Perhaps more can be gained with some time invested in tuning to take advantage of the big bores. I made my own single runner intake but wish I could have access to a mill to properly machine the runners. could you perhaps shed some light on the amount hours it takes to make those big bore butterflies, material and type of CNC equipment used. etc.

 

[illSHOyou]

I would pay the $600.00
Its worth it

Actually strike that, I want a set. Who do I make the check out to?

 

[zblackbeast]

Can you show me what a set fully assembled looks like?

 

[LJRuddy]

Can you show me what a set fully assembled looks like?

It looks like stock butterflies... only bigger

 

[HotRodKid]

Can you show me what a set fully assembled looks like?

they are visible in this picture he already posted