Hey,

Plans changed, we decided to rather slightly upgrade our 98 12valve,

we already have a modded 215 on it, now we are looking either for a HTB2 62 or 64 i get a new 64 for $1285 shipped!

is the 64 a lot more laggy then the 62? what about surging? I really dont even know what it is!
I have had a HTB2 62 but wanna go bigger cuz of egt control! pyro pegged easily with 62/12 215 pump plate, 4k GSK, w/o injectors.

would a 14 housing help? note: high elevation over here!

thanks

 

A 14 will give a little slower spool up but will help with egts. What do you mean by high elevation?

 

maybe i have my ideas mixed up a bit!

might be: high altitude (high above the sea level!)

would a 64/14 be too laggy?
or should i rather get a 62/14

0r even a 64/12, for better spool up and good for more power?

 

had a 64/14 combo on a 215 pump with #10 w/o injectors 3 k gov springs could peg pyro in about 5 seconds. definately laggy and at high altitude .... montana/ colordo smoke and lag was definate. also when towing if you hit the hill in a gear 5th, if you had to down shift to forth even though the rpms were up the egts would ratchet right back up to 1300 so gaining any more speed once you had shifted into the lower gear was not an option. pretty much you picked about 30-35 psi and just held her right there letting off and then trying to get her back up to that pressure was sometimes an issue. i had my waste gate opening at 45psi.

arround town she also was slow to spool up but once spooled she moved pretty well but stop light to stop light and the lag time left alot to be desired i needed some 370s to help decrease lag and get her spinning at a lower rpm faster.


in comparison my hx35 hybrid 60mm was more forgiving when towing for being able to slowdown like when the car in front of you does something stupid and then being able to grab a gear or two spool things back up and get back up to 45-55 mph on a steep hill without pinning the egts horribly. but the ht2b definately once spooled up walked all over the hx35 for being able to carry the power IF nothing slowed you down and made to try to gather up steam again..

Drivability was my issue the ht2b was fine but since i decided to do it all over again i spent twice the money $2600 and picked up my twins and put them on.

my htb2 irritated me a little so take it for what thats worth

 

I really have to work to get my phatshaft 64 hot. I've only passed 1300 twice

 

So how good is the spool-up for the phat shaft vs the HY turbo? My 40 is laggy but after it lights, man I would give it up for anything. After the 3B lights hard, it kicks again. Its kinda like riding a dirt bike, there the bottom igish area, then holy s$%^ hang on stuff. I forgot how fun this truck is.

 

If I'm luggin it I can build boost starting at 1400 rpms, but normally it spools slower than the hx35 I had @ < 20 lbs. With the hx the party was over at 20 lbs, but with the ps64 the party starts at 10 lbs and from there it will build 45 with the quickness. I can drive 50 mph with no boost though.

Hard to accurately describe spool so I hope that worked

Good post Mike- I am still curious how it feels to ride in a TT truck. Just gotta twist Tim's arm one of these days

 

If your talking about your 98 Auto...I would not go bigger than 64/14....especially at altitude. You will still have to live with lag and smoke up to 10 psi boost, and your EGT's will limit you some at times...but anything bigger will be no fun, IMO!

It's MUCH trickier to live with big singles on an auto tranny, than it is on a manual!

RJ

 

WoW i did NOT know lag is worse on an auto then on a manual!
hmmm im confused now!

hmmmm we where about to buy a 62 a while ago, now i rather wanted a 64, just cuz of egts.

ddestruel: So you prefer your twins a whole lot more? Besides spool up, how much better is top power and egts on your twins then the 64? thanks

 

That's just my opinion, based on experience ..... having driven both.
Lag is tied to lack of rpm's (rpm's are what spools up the turbo).
With a manual tranny, in first..or even starting in second gear, you get higher rpm's sooner!
You have to deal with loss of boost as you shift ... but that is different scenario.

RJ

 

the htb2 is a decent compromise $$$ wise. spool up on the twins is about the same as the htb2 maybe a little faster but once she hits say 12 psi tires start wanting to wiggle some. what i like the best is i have almost no smoke at any rpm, well almost you still have the light haze but not the heavy smoke i used to have. hx35 top turbothe change from the 12 housing to the 14 didnt change my spool up at all. otherwise egts at 5000-11000 ft towing a trailer 10k-14k lbs if i keep my foot in it for a long time i can get the egts to inch up on 1350-1400 otherwise the combo is right on the money. when i want to pass someone who has slowed my climb up a long grade who might be doing say 35-45 in the right lane and i am able to maintain 55-65 mph without them in front of me i can pull out drop into (6spd)forth if im not already in it start speeding up grab fifth and never see the egts get over 1300 (sea level to between 5000-6000 ft) all the way up the hill. water temps climb up a ittle but i just watch the gauge.

I will say my buddy put the ht2b on his 01 24v ho with mach 2.5's and an edge comp and his egts are alot better and the spool up ect is different than what it was on my 12v

 

Do you have any surge with that turbo?

 

No surging in my 24v grocery getter.

 

My intial spool-up is slightly slower than a HY35 turbo, after a second you have boost coming on hard. I'm running a 2000 rpm stall in my converter. I used to run a low stall BD LX converter. Your converter, gearing and vehicle weight. I just put hooked up my drag box for kicks. I forgot how much more the truck digs in. Probably that 62 would be a good combo for a twins set-up using a B2. A nice secondary turbo is around the 350-400 hp rating. Your spool-up is slightly slower than just run a single but there way more ump in seat meter running twins. I drove my buddy manual truck with a 35X turbo, yes it lights fast, but there no seat pinning power like mine does. Whats does a stock truck feels like? I drove my dads 05 duramax, mans it takes forever to pass people with it. Imagine what a 235hp is like.