whatcha know about htt's stainless housing?

[Don Tanklage]

got my new turbo and i am not thrilled with the lag or the temps



any of you compared the stainless 13 of theirs to the cast iron housings???



thanks, don



ps - it is a 62/65 s300

 

[sdstriper]

I cannot even believe a 13cm2 would be laggy. Something in that wheel combination I'm guessing.

 

[NYCEGUY01]

I know several guys running them. i could see with a 71 wheel but the one you have should be real good. ??????

 

[Don Tanklage]

it is not "laggy", more like it takes a sec to get to max boost once it comes on, guess i used the wrong term



the temps are what i am concerned about



i only drove it for 15 miles last night but i was not thrilled

 

[DValentine]

Don, I don't have the pump mods, the injectors nor the turbo you are running. I have a modded H1C with a 16cm3 housing. It takes me a bit to get to max boost. Say third gear at 1800 rpm, 30 mph, if I stomp on it the boost will come up to 20-22, and rise to a total of 25 as rpm comes up toward 3000. Mine does not come on all at once. I have not been in any other trucks so I have no comparison.

Can you give us better numbers on what you are seeing. I don't have my truck jacked up too much 'cause I tow with it. I have it set so I don't have to worry about pyro temps. I can get 1100-1150 with a good run without the trailer on now. What are you seeing?



DV

 

[Don Tanklage]

i will give more accurate numbers after next test drive but what do you think about this: on a 1700 rpm roll on its a little slow to make boost, then once boost starts coming on it kind of levels off around 25 for a split sec, then goes to 40 and levels off, then after 2300 it climbs a couple more pounds



i never rev my truck to 3k, tq is fallin off by 2500 so why keep reving it?

 

[Don Tanklage]

okay, i guess i rev it to 3k, sometimes



but only in 2nd and 3rd...



seems like it ran a little better tonight, guess cuz its cooler out?



either that or that thing i found today made more difference than i thought it would...



guess this turbo fell into the - "expectations are premeditated resentments" thingy, dunno. .



straight 5th 1800 rpm (65 mph) no boost 650° - 750°



5th over 1750 rpm almost level ground minimal throttle 10 psi 1000°



i know i can tune the afc some more and get that down some but remember, this is with those smaller ddp inj - whats gonna happen if i give it fuel or hook the trailer up?



don

 

[DValentine]

I thought you had the 366 Gov spring in your truck. I also forgot about the transmission you have, although it is not much different for this discussion. I don't wind her tight in second gear, because it is so short legged in that one. I give her hell in 3, 4 and 5th.



I think GL made a comment a while back about tuning... . that component changes made in one area affect the whole system and that a need for subsiquent tuning in other areas may become evident.

 

[Don Tanklage]

if you mash it in 2nd its kinda hard not to go to 3k



yea, scott is right about that...

 

[CSchafer]

Did you get the 12 or 14cm housing on it? Mine with the 12 goes from about 8psi to 40psi just about instantly. What are your max temps and boost numbers?

 

[Don Tanklage]

neither, it WAS the 13cm SS housing (its already good as gone back)



max boost was 42, and it got there pretty quick - if i mashed it, but at part throttle it was terrible



i dont know for sure what the temps got to (lol). i am sure it was not that bad tho, the afc is not maxed right now and i only have 5x12's in it



what size inj's you got matched up w that 62/12???

 

[therabbittree]

Don maybe its the afc mods you have . . they could make the fuel not come on as smooth. . if ie the afc is on and off quick as you were saying that has a lot to do with the egt and exhaust . . as the fuel controls the turbo via heat. . just a idea. .

That turbo you have or had is supposed to be VERY good. . not sure why you are experiencing something else. .

Thanks

Deo

 

[Don Tanklage]

thanks deo, i have the afc as smooth as possible with the spring that is in there right now. have a couple of different springs on the way. also have another fuel pin here so i could try a milder profile. how much boost did these trucks make stock? trying to set up a different fuel curve but it is a touchy little booger.



how many guys you know with the stainless housing that like theirs? i posted the question in every forum on tdr. read for yourself, it is not just me...



think i have yet to see a post where the guy HAS one and likes it



don

 

[CSchafer]

mine has stock injectors and lights it quick and smooth. I have the star wheel bottomed and the pin butchered. It smokes alot before boost. I havent tried detuning the afc to see how the turbo likes it but I know mine works well set to kill. I rode in a truck with the 66mm 16 stainless housing and it seemed to spool well but the temps went up faaassst! But that was on a heavily fueled 24valve so I really cant tell yeah. Try going crazy on the afc and push the initial pin position down and see if it helps. I remember reading that the 12valves need a good hard shot of fuel to get the turbo spinnin.



P. S. I don't know about your spooling problems but if it's making 42lbs you should be puttin down some good power numbers. Check your temps and try tuning your afc to non functional setting before you go throw it to the curb. If nothing else it will give some good info for the rest of us.

 

[dpuckett]

I think your spooling directly related to your fuelling. The reason is, you say it takes a second to get going, then once it goes, it gets to max boost, right? Or did I miss something? I may need you to go over that part of the report again. If it is smoking, then taking off, your pump may need refreshed. The pump can have a HUGE effect on your EGT, MPG, boost, etc. I got the pump redone on my 91, and I gianed 4mpg, cut smoke to nil, and added a LOT of bottom end. Then I loosened the AFC.



Also, what is your timing set to, and what are your injectors popping at? I checked mine yesterday, and turns out it was at 2. 03mm!!! I turned it back to stock (for now- gonna see how it affects temps and MPG), but also marked 1. 4 and 1. 6mm while I was at it, so I just have to move the pump if I feel the need. It does run better now than before, though I get some haze at a stop light. I know my inejectors are popping a little higher than stock (like 200psi), but not too much.



Also check your intercooling system. You could have a leak, making for high EGT AND low boost. Pay special attention to the elbow to turbo conection, and tighten all your clamps. Your intercooler can LOOK good, but leak like a seive (Bill and I have both been down that road). On the same vein, how is your air filter? With your fuel and air needs, a BHAF and Old Smoky Mount are in order.



Have you called HTT about your issues and problems? They are the first ones I would have talked to. They wont know you are having problems if you dont tell them.



Daniel

 

[Don Tanklage]

shcafer, i can do that easy - and will post results. will also throw the pod's back in and see what it is like then. these ddp stg III inj are only 5x12, i realize this...



daniel, i dont know where the timing is. i dont have the req equip to do it right. pier henry (sp) set the timing in this truck. i could measure the paint marks for ya but i dont know that those really mean anything. from where ever he set it i can give it another 7° with the flip of a switch. however, i am running a stock head gasket and stock head bolts and at 40+ psi dont really want to bump the timing any more than it is anyways. if i really get into high performance i will invest in what is req to accurately set the timing. i should probably check it with your method until then.



dont know what the pop pressure is in either set of injectors. think josh just had the stg III's checked tho...



dont think i have any leaks in the system. i have triple checked everything except the ic. when i yank the radiator i will have my buddy pressure check it, but i think it is fine, would make 35+ psi at >1/4 throttle with the h1c



and finally, yes, i should have the pump gone thru soon. i have only had it smoke real bad and not really want to go once in the last month, but it kinda did it yesterday (was not 'dead pedal') and the car next to me swerved so hard they almost ran into a cop that was passing on their right



it was pretty funny, you had to be there



don

 

[Don Tanklage]

took the afc lever out and even with the smaller stg III inj it made a big difference. dont know if i can get away with towing like that tho...



for sure can not around here but once on the open road no prob. question is can i sneak out of town like that?



for all of you that are still driving these things around with the lever in (afc) you dont know what you are missing. truck is way quiet when it has the extra case pressure and smooth as can be. drives totally different



still dont like the way this thing spools, even at 18 or 19 hundy, when you would think it would wack the needle - it just doesnt



truck hauls butt pretty good tho, once it is on the charger



i want to port the ex housing but doubt they will take it back if i do...



i figure if i am gonna have to p♂ssy foot around town anyways - might as well go w 71 turbine and a 14 cast housing - at least then once i am up to speed it will be right there...

 

[therabbittree]

afc lever? do you mean fuel pin?? with it removed fuel fuel

 

[Don Tanklage]

when you had the ve on your truck did you ever take the top off of it and check out how the afc works?