HTB2 Questions

[Jetpilot]

For all of you running a High Tech HTB2 turbo if possible please chime in and answer a few questions for me:



1) If you have run a PDR-40, B-1, or B-1-2 how does this turbo compare? The areas of concern are spoolup, egt's, and backpressure.



2) Is anyone running the HTB2/64? How do you like it?



3) Has anyone dynoed and what were the results?



pretty much what I am looking to see is how does this turbo stack up against these other turbos. Each has its own pros and cons so I am trying to see where the HTB2 fits in.....



Thanks,



Doug

 

[SRadke]

Did you catch the HTB2 thread Doug? It is located HERE.



This is copied from there:

I just took my HTB2 off this morning so someone in our group can try it out. I put my 40 back on and all I can say is WHATAPIG!!!!



EGT's are up 200*, very laggy, no throttle response...



It's amazing how ya get attached to these mods... .

-Scott

 

[JaMan]

This thing spools so hard that it barks when you push in the clutch to shift, 48psi with my set up and wastegate blocked

Jared

 

[DarrellB]

Mine's doing pretty well so far. Spools as fast as my stock 35/12 and EGT's are down a good 300* with the Drag Comp on Kill. The EGT's will climb to about 800* pretty quick but once there they settle down and seem to hover around 800* or 850* on the Street on a good hard pull. The thing seems to love fuel. The more I feed it the better it does. The boost comes on nice a smooth on the lower levels witch is nice for pulling trailers and daily driving in town. On the upper levels 3-5 the boost comes on hard and fast and will just toast my 33" BFG MT's.



I'm very happy with mine and it's been everything HTT said it would be. I wanted a good durable turbo that would handle 450 to 550HP and I think they came through with a winner.



Just dyno'd mine and got 447hp/964ft-lbs. Turbo didn't lite all the way though, so there is more there I'm sure.



Anything else just ask.



DB

 

[Tcolesanti]

Would one of these HTB2 turbos be a good choice for trucks running smaller injectors like 85hp, or would a hybrid HX-35/40 be a better bet. I know I will not get 450hp, but I may switch to an Ultimate Fueling Module (Edge comp) soon. I still do ALOT of towing and definately don't want to sacrafice spool, but would like to cool things down a bit.

 

[TORQUE THIS]

I ran this turbo with stock injectors, with the comp off it is laggy.

If you are planning on a comp and small injectors, you should be fine IMO.



The one thing this turbo loves is fuel behind it!

 

[DarrellB]

Would one of these HTB2 turbos be a good choice for trucks running smaller injectors like 85hp, or would a hybrid HX-35/40 be a better bet. I know I will not get 450hp, but I may switch to an Ultimate Fueling Module (Edge comp) soon. I still do ALOT of towing and definately don't want to sacrafice spool, but would like to cool things down a bit.

With my Drag Comp off and just my 125hp BullyDog nozzels I can only muster 31lbs of boost out of the turbo under as hard as pull as I can put the truck in. It is laggy with that little of fuel but it's driveable with a manual transmission. I'd say if you went with the version with the clipped wheel for the quicker spool up you'd be right on. Then later down the line you have room to grow into some bigger nozzels.



DB

 

[JaMan]

Mine will roll with the box off and the 100hp injectors and with the wastegate cinched off it will muster 42+ psi boost. Darrel have you checked for a boost leak?

 

[DarrellB]

Mine will roll with the box off and the 100hp injectors and with the wastegate cinched off it will muster 42+ psi boost. Darrel have you checked for a boost leak?

Yep, no boost leaks. If I just floor board the go pedal I can get it to 42lbs but normal driving will only get me 32lbs or so. (my truck has 4:10's and a 5spd) Once I turn the box on it's a completely different story though! This thing loves the fuel, and when you want it the boost is right there. It's really getting nice now that I have some miles on it. It's spooling up faster now and the midrange is really coming in nicely. It's alot faster on spool up than a lot of HX-40 trucks I've rode in.



DB

 

[Hohn]

From the first two hits for a Google of "clipped turbine wheel":





When an angle is machined on the turbine wheel exducer (outlet side), the wheel is said to be 'clipped'. Clipping causes a minor increase in the wheel's flow capability, however, it dramatically lowers the turbo efficiency. This reduction causes the turbo to come up on boost at a later engine speed (increased turbo lag). High performance applications should never use a clipped turbine wheel

 

[Tcolesanti]

"When an angle is machined on the turbine wheel exducer (outlet side), the wheel is said to be 'clipped'. Clipping causes a minor increase in the wheel's flow capability, however, it dramatically lowers the turbo efficiency. This reduction causes the turbo to come up on boost at a later engine speed (increased turbo lag). High performance applications should never use a clipped turbine wheel"





That, is a VERY interesting note. Thank you Hohn.