wastegate ? I did the search thing !

[1 locomotive]

I have a 92 with the banks turbo &stinger kit ( 31/2" exhaust )! my ?? what is the purpose of the waste gate ? IF I unhook it will I get more humph ,power ,or what ? or just leave it alone ?? thanks loco one

 

[MicroOutlawRacer]

The reason for the wastegate (correct me if I am wrong) is to regulate turbo drive pressure. So you can run a smaller housing say a 12cm for the quick spool up but still not run your drive pressure way up at high rpm and WOT by letting some of the exaust go around the housing insted of through it. It also at the same time regulates boost pressure with the exaust. If you lock the wastegate shut you might actually blow up your turbo by running to much boost. It will atleast run your EGT's WAY up. I would just leave it alone but someone with more knowlage on this subject should chime in.



David

 

[EZGZ]

What he said.



Do some more research. Think engineering and desgin.



That's why I choose the a 16cm. Parts that aren't there can't break.



The smaller turbo's spool up fast and make more boost at lower RPM but they can't keep up with the higher RPM volume.



You just have to decided what you want and need.

Banks engineers make great products unless you know what your doing don't mess with it. It's there for a purpose.

 

[Greenleaf]

Yep!

What Micro said.



... ... . no smoke at take off/quick throttle response/low drive pressure at highway speeds.



-S

 

[dpuckett]

It depends on what your wastegate is set at. I havent gotten around to hooing up the gate on mine, due to the fact it is off a 95- opens at about 18 psi. Not near enough airflow to the engine for my fuel and lack of intercooler. If possible, you might unhook the gate (be sure to plug the end somehow) and see how it runs. If you like it, fine; if not, you can always put it back. Seems like I remember way back when, reading that Banks set their gate for around 23 psi. THe H1C is good to about 26-28 psi before losing efficiency, so there may not be too much room to grow. I'll agree that Banks makes a good product, but big gains have been made since the system was put on your truck, and 25 psi is in no way going to "overboost" your engine, as the ads mentioned many years ago.



Daniel

 

[glhs]

Banks wastegate is set for 21 psi, but if/when you start to mess with your fuel screws and add more fuel you will need to have more air too. If you leave it set at 21 psi and add more fuel your pyro. will skyrocket (mine did). I have the wastegate disconnected and so far, have no temps. over 1200 at 6000' ft. I think if I ever hit 35 or more psi, then I would probably start seeing some higher temps and may have to bleed some off.

Another way to look at it; if you had a 16cm housing running 30 psi and changed out for a 14cm housing your boost would go up about 2 psi. So big deal, you are now "over boosting" by 2 psi at WOT.

I did try a 12cm housing when I was only making 26 psi. Bottom end felt the same but top end it was worse. My . 02 cents.

Kurt

 

[1 locomotive]

THANKS GUYS !! I"M learning so much Info from this board !! happy to be a member !! I really like my truck !! 92,le,extra cab ,5speed ,2wd, 125,000, nv4500soon!

 

[Bob Beauchaine]

I am running a Banks 14cm turbo and see 32 PSI of boost when I am on a dyno or I put my foot into it seriously. I re-set my waste gate to start opening at 30 PSI. Right now the setup works quite well.



Bob

 

[Wayno]

I have been running my Banks waist gate disconnected for years and it hasn't hurt a thing . I get about 21psi with it hooked up and about 28psi with it disconnected .

 

[Diesel Freak]

I had to cut back boost this weekend. With the DD3's I was hitting 38 PSI with the HX40. After I installed MACH4's I was hitting 44 psi.



To lower boost and keep the turbo from going bye bye, I backed the wastgate off to 40 psi by unscrewing the actuator arm four turns to make it open further.



more boost does not mean more power, but if you keep the turbo in it's efficiency range it will lower EGT.



in my case I was not looking to lower EGT (it gets a little hot no matter what I do now) I did it to keep from breaking a turbine shaft in half.

 

[dpuckett]

What he said. I by no means meant to imply that more boost= more power, per se. Just when you are running as much fuel as some here are, 21 psi through ANY turbo falls short. I've seen 40+ on my truck a few times, but also know I'm at the upper end of my efficiency range there, too, maybe a little out of it.

 

[BushWakr - RIP]

Just a bit of correction/clarification... . it's not the "extra couple psi" boost that is the issue (within reason) so much as the drive pressure rise. .

Going from 30psi to 32psi is not a major problem (generally) but the "backing up" of exhaust gases trying to get INTO the inlet of that 12cm, 14cm etc IS...

At some point the volume of gases is greater than the exhaust housings' ability to accomodate it. . that is were drive pressure increases to higher levels. . basically it's the "ugly sister" of boost pressure and works against you... alot. .

I bet DF can attest to that one...

The stock H1 turbo is reaching it's upper map at around 26-28psi... the HX35 series is very close to the same, say, 28-30psi, hybrids extend that upward even further... .

No matter what turbo you use, you can run into the same problem.

You can have an exhaust housing too small for the gas volume and have drive pressure issue's.

The wastegate helps to reduce or eliminate that problem by dumping boost or exhaust gas in advance of reaching that drive pressure level. If you run up into and/or over the "map" with no wastegate, then you are going to have high drive pressures AND possibly "over boost condition" as well.



Pastor Bob... aka: BushWakr

 

[Timebomb]

I agree with all of you on the wastgate matter.

Use me as a ginnypig for a reason to go with a Hx35 or better with mods such as mine.....



H1c/14 non wastgated housing

Quik spool up lots of smoke.....

Once screaming high drive pressure sets in and EGT's go way up at 2200 rpm in 5th on the interstate I'm @ 35lbs and EGT's are about 1250. If i hold into it the boost dosnt rise but the EGT's keep soring high @ 2600 I'm at 1475deg. and i let out im sure by 3000 the EGT's would be much higher but I'd rather not find out how high they go. Im not ready for new pistons and rebuild.....



I was looking at a schwitzer on a Mack today. The one that was on it was kinda small (for a big truck) The compresser was about like a HX40 and the turbine side was a little different shape more round. I said something to on of the mechanics about getting specs from it. He said the shop used them on there triple turbo Duietz (spell check) and that turbo helped push some bigger ones to a total of 176lbs of boost:--) . . so it must be a stout made turbo... Im gonna do some research on it ... ... .

 

[dpuckett]

So you're saying, Pastor, that I maybe should go back to the 18 cm housing, seeing as how I use the higher RPM/ boost (frequently see 20+ going thru the gears in traffic) range with my detrimental gearing? I think the 12, coupled with my less than fether-weight right foot is what has caused most of my MPGs to head south.



The "overboost" I was referring to was to the engine itself, as the ads from a few years ago led one to believe; not overrunning the turbo and running drive pressures up, up, and away. I had forgotten about that perspective.



I shall now repent for my sin (forgetting about TURBO overboost) against the Blessed Lady of Accleration-

Hail Holset, Hail Holset, Hail Holset, Hail Holset, Hail Holset, Hail Holset, Hail Holset, Hail Holset, Hail Holset, Hail Holset.



Daniel

 

[BushWakr - RIP]

:-laf :-laf... . repeat after me... . "smoke is good, smoke is good... :-laf...



If it were me, I'd to the under rated 16cm housing and have the best of both...



Pastor Bob. .

 

[sparks57]

Daniel, IMO that 12 you're running is way too small for your gearing. I would suggest the 18.



I'm running 3. 54's and I like my 16. It's a good overall housing.



It seems that you guys think the only 14cm and under has wastegates. That is not so. In higher HP applications, like the hotrod second gens, they have wastegates on all the housing sized because they can overboost any housing.



Overboosting can be detrimental to combustion, and the back pressure gets really nasty.

 

[dpuckett]

Hey, Chris, send me your old 18 cm housing, and I'll pay you when i find another job . Just kidding. I had thought about that, too. Really isnt a whole lot of difference in the two, except the 12 is faster than the 18 off the line, but the pump can be adjusted to compensate for that. It seemed to breathe a lot better with the 18 than it does now. Have to see what I can dig up. I'd really rather go with a 16, but money is tight now (more so than normal, even) and I may have to just make due with someone's old takeoff.



Daniel

 

[sparks57]

I do have an h1c I'm looking to get rid of. It's got an 18 on it. You can port the exhaust housing to make it flow even better and spool like a 16.



I can port it (well, have it ported) for you cheap if you want it.



So if anyone wants an h1c or a 18cm housing, PM me.

 

[1 locomotive]

thanks guys ! I brought this truck with the banks power pack ,stinger kit allready on it !? what size turbo is this banks ? all I can find out about it is ( quick turbo charger assembly/ with discreat wastegate ) what size is that ?? thanks again

 

[Bob Beauchaine]

It's a 14cm turbo.



Bob