Anyone go from a ht3b to a B2 as their primary charger in a twin set up? Curious about egts and horsepower differences. I understand they are reverse flow from each other but does twice the price justify going to a b2? Are there different housings available for the b2? Thanks Tim

 

Tim,

I gained 34hp going from the 3b to the B2 and adding a lockup switch. If you know where to shop the B2 is about 50% (or less) more than a box stock 3b. I have talk to Ken about the B2 and he hasn't said there is a different housing available but I doubt there has been much call for one either. You might call him and ask though.

Nathan

 

Nathan, do you think the B-2 is better than the 3B.........need your input here, if you were building your first set of Twins and had the data which would you go with.

I'm also curious how you like the B/B? It seems just fine running in valet for me but I haven't hear of any 24V guys running it.

Jim

 

I heard the 24v struggles to spool a b/b. Maybe with a manual trans you could get away with it, but a auto daily driver 24v just does not have the fuel. I am really interested in the b2 also. Several people have emailed me saying the b2 will add power for sure. If I test one I will try to give you some exact numbers, Jim.
Nathen, did the 34hp come without adding fuel ,just air? Tim

 

Sorry to interupt your interesting thread but could you explain what you mean by..."I understand they are reverse flow from each other..."

RJ

 

It wouldn't surprise me if much of your HP came form the lockup switch... locking the TC allowing 100% of the power to get into the tranny instead of slipping...

 

..."I understand they are reverse flow from each other..."

RJ, the B2 as well as the B/B are reverse rotation, the 3B's are standard rotation, so for a visual the 3B would be mounted and blowing air towards the fender were the B's would blow it straight up to the hood, this is were the B/B is a pain to install as it big but the reverse rotation doen't allow you to stuff it under the manifold (you have to make it do that) and it hits or get close to the frame, I had to tack weld and test fit mine 4 times till it was right and still could have been a little better.

Jim

 

Jim,

Actually you have it backwards. The HT3B is reverse rotation as indicated by the "T". The same holds true for a HT60 vs. a HX60.

I believe the B2 does outflow the 3B resulting in more hp and lower egt's. The only downside to the B2 is it is noisy compared to the 3B. That might be able to be cured by a small o-ring in the compressor cover though. The B2 might spool slightly slower but the difference is imperceivable. I'd build a B2 combo over a 3B combo any day if I was starting from scratch and the difference in cost wasn't a big factor.

The BB appears to be a little large for a 24v and a stock vp pump IMO. I'm still working out the tuning on my wastegate so I cant really pass full judgement on it as of yet. Cruising on the freeway my egt's run 850-900* @70-75mph (up about 100* over the 40/B2) but it's only in the 40's here right now too. It does make boost fairly easy but it wont zing up like a B2 once it makes boost. The NewGen WG I'm using is pretty big for this application so I've had to try and limit the opening distance to keep it from losing all or most of the boost from the top turbo. I'm sure I'll have to get it on the dyno to really get it fine tuned but until then I'll keep tinkering with it on the road (which is quite interesting with wet and/or cold roads). The closer I get the lower the egt's get and the better the SOP power feels. It also gets easier not to smoke out every other car on the road. When I first put them together I couldn't built any boost at the line so hopefully I'll get a chance to try again soon and see if things have improved. It's actually getting harder to find places to test on the road that are close by as subdivision after subdivision pops up.

Nathan

 

Got ya on the rotation deal.......I don't get technical, mostly just look at it.

It's odd that your having issues with the B/B at that power level and I don't at 550 in valet.....two total different anamals are the 12 and 24V.

I don't know what prices are like now but at one time the Modified 3B's were like 500-600 and the B-2's were more like a grand............allot more to pay for maybe a little more turbo.

Jim