The wastegate on the turbos I have will open under 8psi of boost. I want it to open under 3-5 psi of boost. It is an external wastegate. How do I change the pressure that it will open under? Can I adjust the actuator rod, or change the spring? Where would I find this spring if that is the answer?

So... I am down to four minor (haha, yeah right) things left.

1. Plumbing. I heard of a place on Atlantic or Wake Forest Road (maybe) that does custom oil lines. It is either near 'The Doll House' or near the Habitat Reuse Center. Does anybody know what that place is called, or where exactly it is?

2. Exhaust. I need to map out the exhaust and intake pipes. I plan on making it/ mocking it up with PVC, and then going through and making an exact copy out of SS pipe. This also includes the turbo cage (not ss) that I need to fab/ have fabbed.

3. Wideband. Don't know what brand to go with yet.

4. Fuel Management. SAFC? other ideas? Possible bigger injectors as well?

Input welcome. Answers to my first questions really appreciated. Flaming expected.

5/4/2006 8:31:40 PM

1:"Parker" store has all the fittings you need and they make any line you want Its on the Doll House side of Yonkers beside Fastenall.

2:Get it mocked up and get whatever SS tube you are planning to use and call me

3: No Idea

4:See above

5/4/2006 8:37:00 PM

Thanks.

Don't forget this question as well:
The wastegate on the turbos I have will open under 8psi of boost. I want it to open under 3-5 psi of boost. It is an external wastegate. How do I change the pressure that it will open under? Can I adjust the actuator rod, or change the spring? Where would I find this spring if that is the answer?

5/4/2006 8:48:21 PM

at the muffler bearing shop

5/4/2006 9:02:52 PM

You're talking about an internal w/g, not an external. You can't change it a lower psi setting.

The best thing to do would be to get a different wastegate from another turbo set at a smaller psi. Changing the spring isn't worth it on internal w/g's. However, I don't know of any internal gates set at that low of a psi. Try looking on ebay for something.



Fuck it... weld the flapper shut and get an external

[Edited on May 4, 2006 at 9:11 PM. Reason : .]

5/4/2006 9:03:29 PM

....and to answer some of your other questions:

1. tunertoys.com has awesome oil line kits. i know the guy that makes them (Steve from stealthmode). they have AWESOME customer service, fast shipping, and great prices. that's where i got my kit from

2. can you weld? if not, take it to henry's exhaust shop in raleigh. the guy offered to do my piping there for cheap.

3. bleh...

4. safc for tuning is outdated. if you're serious, go with a standalone. might as well if you plan on shelling out the money for a wideband. if you're on a budget, a chipped ecu (like crome, uberdata, turboedit, etc) is always a decent choice. make sure you know a decent tuner. and yes, get bigger injectors.

5/4/2006 9:10:27 PM

are you sure the spring in the wg is 8psi?

5/4/2006 9:37:13 PM

Quote :

"3. Wideband. Don't know what brand to go with yet."

AEM dammit

5/4/2006 10:55:48 PM

http://ls1tech.com/forums/showthread.php?t=385440

5/4/2006 10:57:46 PM

"minor"

bahahah

5/4/2006 10:58:52 PM

as far as my wastegate spring question, i know that is stock boost on the 1.8t that the turbos came off of, but the boost is controlled by the n75 valve...

5/4/2006 11:02:35 PM

You guys are right, it is an internal wastegate, I don't know why I typed external.

Yes, I am sure that without any controls, the stock gate opens at 8 psi.

Thanks for the info so far.

5/4/2006 11:14:39 PM

actually i think the AEM comes with a Bosch wideband sensor

and i'd go with a PLX instead
http://www.plxdevices.com/M-Series_productinfo.htm

5/4/2006 11:42:15 PM

Is 3-5 psi even worth it? I honestly don't know of any internal gate actuators that are set that low.

5/5/2006 1:08:54 AM

the engine should handle 8psi with the proper fuel mods

what's the compression?

5/5/2006 1:20:31 AM

I know a Z31 only goes about 5 psi, but I don't know if that's just due to exhaust restriction or the wastegate spring or what

For fuel control, see my thread about Megasquirt. I think no matter what you're going to have to do some serious custom wiring here for standalone. Good luck finding something that's plug-n-play for that car. I'm not sure, but your car probably runs off a shitty flapper-type MAF just like my supra and my rx7, so you stand to gain a lot from eliminating that restriction. SAFC is better than nothing (i've got one right now) but you really need something way more precise. Of course you're then looking at time and/or $texas

[Edited on May 5, 2006 at 1:29 AM. Reason : .]

5/5/2006 1:27:55 AM

Remember, Daryl, there is no such thing as a stupid question.

There are, however, lots of stupid assholes who ask questions. I'm really not sure, but I don't THINK you belong in this category.

5/5/2006 1:28:55 AM

maximum boost- corky bell

teh bible

5/5/2006 2:03:29 AM

use a throttleing valve !! hahahaha

(i'm kidding)

yeah the only think i can think of is a pair of external gates and if you set them for 5 psi everything should be fine... i don't even think you'd need to weld the internal one probably wouldn't be a bad idea though..

i really don't understand the point in all this though 8psi should be fine on any motor... i know s2000s with 8psi on their stock bottom end and thats one very high compression motor.

5/5/2006 2:34:18 AM

3. zietronix or plx

5/5/2006 4:13:26 AM

5psi... 8psi... either way, you're gonna break something.

5/5/2006 10:12:59 AM

this is going to be a non issue. you know, since its never going to run well enough to make boost anyway.

[Edited on May 5, 2006 at 10:28 AM. Reason : *]

5/5/2006 10:28:10 AM

I don't think you should bother with a standalone unless you really want to spend a lot of $. The SAFC will work, just not as well. I would think you'll need bigger injectors or at least an upgraded fuel pump. As far as widebands, I've heard good things about the aem uego.

I really wouldn't worry about 8psi honestly. Boost pressure isn't always the greatest indication of how much stress you'll put on the engine. Yes 10psi is going to move more air than 5psi on the same turbo, but 8psi on one turbo is not necessarily the same as 8psi on another. CFM matters as well, and iirc you're using a really small turbo so 8psi isn't like some insane boost level or something. I don't think you should bother attempting to reduce it further than that really.

[Edited on May 5, 2006 at 12:47 PM. Reason : ]

5/5/2006 12:27:19 PM

On a internal gate, chances are you wont be able to see 3 lbs of boost, 5 is even a strecth. If your building your own kit you need to go ahead and get you a external wastegate. Your best bet is a tial. Then you should be able to see 4lbs of boost or so with the right spring(make sure to remove the internal gate and have it welded up).

1 Ive never heard of these guys, but I haven't lived here long either. People seem to reccomend them so that will work for me.

2. Mock it up, figure out your bends and order your parts from burns stainless. They make the good shit

3 For simplicity and placement alone I would go with a AEM wideband. Plus if you go aem standalone in the future you can datalog.

4 While huntman is correct that the safc is outdated, there is no need for a standalone on only 5 lbs. A safc should work fine. If you plan on running a safc and venting atmospherically, you need to move the maf into the intercooler piping and make sure you vent before the maf, or you can leave the maf on the intake of the turbo but you need to recirculate the blow off.

5/5/2006 1:48:45 PM

still a dumb idea

5/5/2006 3:11:51 PM

Yeah, I don't know what I was thinking. 8 psi spring is fine. I was thinking 8 x 2 for some reason. I realize that was stupid.

I am moving the maf, and it is a hot wire type.

I have an upgraded fuel pump for this project already.

5/5/2006 4:38:35 PM

I wish ya the best of luck, custom turbo kits are a black hole for money..Ive been there before.

5/6/2006 12:04:16 PM

We are talkind psi here not bar right 3 bar would be a bit high, but 3 psi would be a bit low

5/6/2006 1:06:57 PM

Quote :

"4 While huntman is correct that the safc is outdated, there is no need for a standalone on only 5 lbs. A safc should work fine. If you plan on running a safc and venting atmospherically, you need to move the maf into the intercooler piping and make sure you vent before the maf, or you can leave the maf on the intake of the turbo but you need to recirculate the blow off."

If those cars still use a flapper-type MAF he's going to have to be careful about keeping it level. It's my understanding taht you if you don't keep them level it distorts the readings.

5/6/2006 5:29:07 PM

^Like I have said, It is a hot wire type, not a flapper.

5/7/2006 4:39:03 PM

^fuck i forgot

so used to my damn 80s sports cars

5/8/2006 12:17:02 AM

arg youre right though, 80s cars kick ass! My 323 has a flap sensor, levelness helps a bit. But since its spring loaded pretty tight it doestn make that big of a diffrence

5/8/2006 5:31:11 PM