HTB2 as top turbo in twins.

[RonA]

A couple of months ago i talked to HTT about this and was told it was being done. Any news on how it worked out.

 

[SRadke]

I'd like to build a set with mine and a HT3B but haven't gotten to it yet.....



-Scott

 

[RonA]

I am not sure how it will do. It would be interesting to wastegate an hx40 at about 25lbs and an HTB2 at the same, and then compare the egt and hp readings from each. Seems like the 40 is hard to beat as a top turbo for performance. The HTB2 and B1 can beat it as singles but it seems to be different with twins. That high boost capability doesn't seem to help on a top turbo.

RonA

 

[justinp20012500]

I'd like to build a set with mine and a HT3B but haven't gotten to it yet.....

-Scott

Don't you think that having a top turbo of that magnitude would require a bigger/better bottom turbo then a HT3B/BHT3B???

Just a brain fart...

 

[justinp20012500]

A couple of months ago i talked to HTT about this and was told it was being done. Any news on how it worked out.

I live about 10 minutes from HTT who are you talking to?? I would like to go down and talk to those guys about what they are doing.

 

[Cooker]

I'm pretty sure at one time csutton7 was running a B1/HT3b setup. Actually I am not sure about the 3b but I know he was running a B1 with his twins.



I don't know that you would have to use a bigger turbo than a 3b but I would think it would allow you to be able to.

 

[RonA]

It doesn't sound like anyone has done it yet. HTT wasn't sure it would be a good turbo for that application. But I seems to be real good as a single. I'll keep waiting.

 

[Jim Fulmer]

As I see it the B-1 or the HT2B is not if any bigger than a 40 and everyone knows, or should know that setup works great but as with any Twin setup you have to have enough fuel for it, meaning I wouldn't use a 40/3B to build a 450 hp truck.



It all depends on how much your willing to give up on the bottom.



Jim

 

[RonA]

I believe BBD is somewhere around 630 with his 35 hybrid/3B twins. Mine will do 500 without going over 1000 deg. But I am still curious about new stuff that comes out. Especially if it spools quickly without causing black lung. Now that I can change top turbos without changing my piping I can easily explore some different combinations, clutch permitting of course.

RonA

 

[Jim Fulmer]

I too my old setup 35/3B to 670 on fuel but EGT's were real high so yes it can be done, but he 35 I found out later was rubbing the housing so it was about to go BOOM... ... . 65psi and 72-75 drive pressure as I remember.



With any setup if your running lets say 70 psi and you have the wastegate closed or don't have one then the turbo top turbo not only see's lets say 70 psi drive pressure but it also sees the 35 psi or so extra pressure on it's nose... ... . not good for a turbo.



There are some on the net that will run something in the ground without ever telling the whole story of the events leading up to the failure. I've heard stories of people that cuss a 40's failure rate then bark the crap out of it all the time and pull in a parking lot gunning it and shut it off at 650 degrees... ... ... ... ... were is the problem... ... ... ... ... who will tell the truth!



Food for thought!



Jim

 

[RonA]

I agree that most of the failures are caused by not reading the instructions. Especially the part that says 38psi max. But if another turbo came along that would perform as well as an Hx40 in the range that a top turbo has to operate, and it was stronger and could handle the higher pressure. I would be interested. The USB wasn't it, maybe the HTB2 won't be it either. But I still like to read about other people trying new things for the middle hp range. Maybe less egt at cruise, maybe less smoke in town, maybe just to be different.

 

[JaMan]

Someone send me a ht3b and a set of mach 5 edm's and I'll try it... I'll be your guinne pig...



Jared

 

[RonA]

I know there aren't many big hills in Texas, but i would be interested to know what your egt is at a sustained 25 lbs of boost on a grade in 6th gear.

 

[SRadke]

Don't you think that having a top turbo of that magnitude would require a bigger/better bottom turbo then a HT3B/BHT3B???



Just a brain fart...

I don't know. I'm looking for mid range horsepower, 450 ish, and I believe my quick spooling HTB2 combined with a 3b could do that... . and do it well. Perhaps budget permiting I may try something bigger but I don't want to get too big for my application.



-Scott

 

[Jim Fulmer]

Scott you would be better off with a 35/3B at that power level as long as it was built/setup right, I just can't see were the HTB2 would spool like a modified 35.



Jim

 

[BPonci]

Keep in mind that some people forget that wheel size ,trim along with weight of the combo makes a real lag pig for a top charger in a set of twins.

 

[SRadke]

Scott you would be better off with a 35/3B at that power level as long as it was built/setup right, I just can't see were the HTB2 would spool like a modified 35.



Jim

If I were starting from scratch I would go that route but I already have the B2 I'm using as a single and I'm more than happy with how it spools. How much additional lag is generally created from the added piping etc of a twin system? If not a lot, I should be fine.



-Scott

 

[Lucas5477]

100-200 rpm's with twins, In spool up time. So I read.



Lucas

 

[hemijustin]

where can i get some info on the biger turbos? sutch as the Ht3b... .

thanks,

Justin

 

[Hohn]

Don't you think that having a top turbo of that magnitude would require a bigger/better bottom turbo then a HT3B/BHT3B???



Just a brain fart...

That's what I was thinking. Maybe the HTB2 isn't that much bigger than a 40.



But I'd think that the other HTT turbos (SP66, Killer B2, etc) would want/need something more along the lines of HT4C/Big Brother/B52 or somesuch.