What's the psi that the internal wastegate spring of a 14b holds stock? The number on my 14b is as follows: TD05H 49178-014000

It's from a 1g JDM eclipse GSX.

I think it's over 5psi, so how can I lower the pressure to 5psi?

Thanks!

 

It is set at 8psi I am pretty sure (homemadeturbo.com), and I do not believe you can lower the psi it takes to actuate, you'd have to find a different wastegate.

It would not be very hard I imagine to mount any other external wastegate on there, if you could find a 5psi junkyard wastegate, probably some modifying of the rod / mount bracket.

If you have decent management (ie ecu tuning, turboedit, uber, crome...) I would just go for the 8psi you should be more than fine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civic_driver &raquo;</TD></TR><TR><TD CLASS="quote">
It's from a 1g JDM eclipse GSX.
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LOL... Right...


if you want to lower the boost pressure of the wastegate you can cut the arm; thread it and use a long threaded coupler to very tension on the wg actuator arm..

 

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It is set at 8psi I am pretty sure (homemadeturbo.com), and I do not believe you can lower the psi it takes to actuate, you'd have to find a different wastegate.
It would not be very hard I imagine to mount any other external wastegate on there, if you could find a 5psi junkyard wastegate, probably some modifying of the rod / mount bracket.
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Is it possible to mount the external wastegate on the downpipe? I'll have a 2-pipe downpipe with ports for the internal wastegate and for the turbo exhaust. So I'm thinking if I remove the internal wastagate flapper and mount an external wastegate on the internal wastagate downpipe very close to where the downpipe is mounted to the turbo exhaust it will work. What do you think?

Also, I know HMT has a list of turbos with set pressures but I don't think any on the list matches the one I got. The closest is the 14b from a USDM 1g DSM Eclipse. Are the USDM and JDM stock psi the same on the 14b turbos?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
If you have decent management (ie ecu tuning, turboedit, uber, crome...) I would just go for the 8psi you should be more than fine.
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I understand that. 8psi might work. Give it has a sligh crack near the internal wastegate the stock psi might be even lower, maybe something like 6-7psi if the original is 8psi so it should be even better for my setup at this point.

Reason I'm concerned is this is on a d15b7 motor and I hear it can handle 150-160 hp pretty good but above that is more of a risk (weak rods).


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
LOL... Right...
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Am I missing something?

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if you want to lower the boost pressure of the wastegate you can cut the arm; thread it and use a long threaded coupler to very tension on the wg actuator arm..
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I think this is the way I'll go. I've heard something about it. How do I exactly go about doing this?

Thanks!

 

anyone?

 

hmmm, i think im the odd ball out of all the 14b'ers cause im pushing a solid 10psi on the stock actuator spring. i have done no modification to the actuator, only thing i can think of is that i clocked my turbo and the actuator arm sits at more of an angle than stock. however, from what ive read in the past i think around 7-8psi is about stock, not too sure if i believe that though

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civic_driver &raquo;</TD></TR><TR><TD CLASS="quote">

It's from a 1g JDM eclipse GSX.
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Umm... There was no JDM Eclipse. In fact, the eclipse was considered to be an American car in Japan. Also, the closest that motor was from JDM was the EVO I in 1992 Production,( and its a lower compression version at that)

Be careful when you use those dreaded 3 letters J-D-M

 

check this out: http://cgi.ebay.com/ebaymotors...%3AIT

what does it look like to you?

 

beeateteen

It's funny you should say that, because although I took that 8psi info from hmt.com, I also clocked my turbo and mounted the wg with a little tension on the arm, and my boost gauge reads 10 psi by the top of 2nd (I don't really think this is due to the mounting though, my signal line is tapped at the intake manifold, however).

civic_driver

The method spoken of should achieve your goal one way or another, but if you lengthen the rod with a threaded coupler, you will be opening the wastegate some without any boost on the actuator. This will cause the turbo not to spool until later and it might not hit the same peak boost, depending how much it's open. You would have to open it enough so that it only reaches your desired 5psi by redline, in which case you shouldn't even need a signal line on the wastegate.

If I were you I'd just mount it with tension on the arm (wastegate closed) and take the signal line off the compressor or close charge pipe, this way if you have any boost loss through an intercooler, the wastegate won't see it (maybe, I'm not an expert in fluid dynamics). I would not be scared of 10psi on a stock motor, it will be fun and run fine so long as you take care of it (chipped, synthetic oil, make sure your radiator effectively cools the engine). i talk too much =] good luck

 

I said lol because most of the dsm's in japan came with a big or little 16g and they were called 2000gt vr4's or something like that. I'm guessing you bought the turbo from some idiot spitting out jdm every other word and got took; thats why i laughed.

if not then cool; its not special though so dont call it jdm; if it was in fact from japan then most likely it would be a 16g

 

i don't care if it's jdm or not... what i care about is if it's 14b or not... so by the numbers i provided and the picture, is it a 14b?

 

is it 14b?

 

yea that looks like a 14b to me.

 

looks 14b to me