Engine/Transmission (1998.5 - 2002) twins HX-35 HT3B

[OPoole]

I am learning on twins how would a HX-35 with a 12cm work with a HT3B in a set of twins would the 12cm housing be to small? which exhaust housing on the ht3b 23cm or 26cm would the 12cm wastegate be to small or would you need ext. wastegate

THANKS or is the HX 35 a waste of time? just look for a good street set up 500hp max with good spool up

 

[willyslover]

a 35 on top is what Piers uses on his small set of twins that he sells...

several guys on this board have his or similar set ups. .

housings need to be determined by your fueling levels & egt levels ... they will change as you add additional fuel until your drive pressures get out of balance and then different turbos will be needed... little housings will spool faster and be needed at 500HP level as you will not be fueling hard there to drive the larger ones [however I wouldn't start with a 12 on the 35]



suggest you talk with Jim Fulmer as he did his own using that set up , don't know which housings he used to start... he used them thru 700+ HP

 

[Jim Fulmer]

a 35 on top is what Piers uses on his small set of twins that he sells...



He uses a 40 on top like my new set, the 35 goes on the towing Twins there just starting. Yes I went to 709 with a stock 35/18. 5 and a HT3B/26 which is way past were it belongs but heck none had ever done it! I would say at least a 14 housing on the 35 (I don't like 12's) and a 23 on the 3B for towing and a 26 or bigger for performance.





I haven't forgot you olee, I'm working 10pm-7am and trying to get my truck finished when I can!





Jim

 

[hammersley]

What does this setup cost - ballpark? Is it street driveable? I assume it will not tow...

 

[OPoole]

thanks jim for the input! what about the wastegates? i seen a set up that was not wastegated at all just had a blow off on intake press. side i am a patient person so when you get time i will be here THANKS

 

[Jim Fulmer]

Hammersley, I don't talk allot about prices as it hurts the vendors, but I will tell you that the Twin kits you can buy out there are great as building a set is a pain at times. Yes you can tow with a Twin setup but I wouldn't tow with a 18. 5 housing, more like a 16, or a racepump'd 700 hp truck but Piers does... it all depends on what power you want.



OPoole, we'll talk on the phone about it all.



Jim

 

[willyslover]

sorry . . thought the HX35 set-up was on the market now

 

[Cooker]

Jim, dd you try any other exhaust housings on the HX35 before the 18. 5?



I agree I think the 18. 5 might be a little big for a towing setup. On the other hand is the 14 going to be a little too tight? Any idea what Piers towing twins will run for a housing on the 35?



Thanks.

 

[Jim Fulmer]

Jim, did you try any other exhaust housings on the HX35 before the 18. 5?



Started with a 16 and it and the 18. 5 are the same with drive pressure till after 60! On Piers Towing Twins it looks like it will be a 14 housing, Jason finally has it contained to 50 psi with his tweaked 215 pump.



Jim

 

[Cooker]

Thanks for the info

 

[OPoole]

What size sould the cold pumping be. i seen some that was the same size form the HT3B to the top turbo and some that was small and jump up bigger at the small turbo.

 

[Jim Fulmer]

Good question, I really don't know but I like the 4" for the cool effect... . it will look better HPC coated, really the only thing to look at is volocity and overall air volume then when it hits the little charger that all goes away, I see nothing wrong with the 4" right now.



Jim

 

[BPINE]

I will have info on the 3B 35-14 combo very soon, I have all the parts gathered up and am just waiting for the O ring tool to come back so I can o ring the head and block before I get sterted. I am going to use the Van Hasiley set up for the head gasket. I have been involved with many o ring jobs with HVAC and this was our next step so here we go. I tow pretty heavy (14k) and have tried most turbo's on the market and some that are not, none have done the job for me.

 

[OPoole]

I want to do some thing to my head also i do a lot of port work on mustang 5. 0 and have a flow bench. never ported a 5. 9 head but going to have a 12v to try. and then my 24v next... but i don't know if i sould O-ring? fire ring? or C-ring and do i go with the std head gasket or thicker. Is it better to O-ring the block? i am going to buy the BHJ O-ringing tool soon because no body in my area has one Salisbury NC 28146

 

[OPoole]

THANKS for all the input! i would like some pic. of some twin set ups.

 

[BPonci]

When i dynoed up at PDR, i ran a 35/12 and a bht3b/26. The spool up was real fast but lost alot on the top end. My egt was very controlable with that set up. Back then i ran a 180 cali pump. Now i run a 913 pump. I have tried a 23 cm housing and didn't like it. I feel if you go out of the 35 through your hot pipe to a divided housing there is alot of disturbance. It felt as if there was something holding you back. {drive pressure}Remember the divided housing relies on exhaust pulse to achive fast spool up. Maybe if you can find a single entry it would be better. I now have a pdr40/hybrid14cm on top. Going to be changing to something real nice soon!Hope this might help someone. Have a great day!

 

[BPonci]

Opps,almost forgot to say that i have built 2 other twin systems for my 24valve towing /race customers. They run the 35/12 and the bht3b26. One customer runs 40" swampers the other runs 35" bfg. Both have dd stage 3 injectors and drag comp. One has propane. Temps before twins 1525 and 1600 plus. One customer had a 40 the other had a 35/16 with propane. After twins and stage 2 head 1250 degrees with propane on at 55 psi. Other customers temps were 1200 at 55 psi.

 

[Cooker]

I'm considering a twin setup. I have both an HX35 and an HX40 but I think I want to utilize the 35 instead of the 40. As I understand it the twin setup will spool just a tad slower than the small turbo. I really do not want any more lag than an HX40/16 and if there was less that would be even better



If I maintain the 35 in a twin setup I am trying to determine what housing would work best. I was guessing the 12 would choke a little too much but maybe this is not the case give the comments of BPonci. If I can get away with a 35/12 that is obviously going to be the fastest spoolup. Also I wanted to shy away from the 16 because I am trying to stay away from an ext. wastegate on the setup (for cost efficiency reasons). The 14 is probably the best bet as I am sure there is a reason Piers is chosing to run the 14



Jim, if I remember correctly on your previous setup you had an ext. wastegate. Do you think you could have safely run the setup without the wastegate?

 

[Bandit1]

i agree with cooker 100%, i want the same kind of twin setup and siince i already have the 35 it would be nice to use it. any info please post.

 

[Jim Fulmer]

Nope, proved that one already! The idea behind the wastegate setup is to bypass the little turbo to a degree and drive the big turbo harder to make the big boost as it has a better map and the air will be cooler, a turbo is stupid it only does what you tell it to do, if you feed it ambient air then it will only give you so much, if you force feed it then it still does the same work but is compounded by the fact that you added a higher air pressure to the supply system, remember standard day air is 14. 7 psi, add 30 psi of boost on top of that and your in a different world. I won't give you full numbers as I'm not done testing nor do I know if there suppose to be let out but I will tell you that on my current combo in valet at 65 psi the air temp at the hat is 25% higher than it is in full fuel at 80 psi, why, simple the way it's setup the big charger is doing most of the work in full fuel were the 40 is doing the big work in valet, hence better map on the B/B, more boost, lower air temp..... this is exactly what I was after. Will it work good at 100 psi..... who knows it hasn't been tested and I'm the only truck with this combo but not for long. A 55 on top would be much better after say 2200 but not have near the drive ability, if I'm at 800 degrees egt at 2K I can bounce the boost needle like a ball... ... does that tell you anything! You guys have some good questions keep them up at least for the archives.



Jim