For the guys running high boost!

[rb25drag]

What Size waste gates are you guys running to handle 25-30PSI? Most of what im finding is the 38-44MM gates.

Im getting my car ready for the Propane setup Finally. I plan on running upwards of 28-30PSI Maybe, Unless Its going to give me Alot of lag at the track. If so Then I will raise the compression of the motor to somewere around 13:1, and lower the boost to around 15-20PSI.

But I need to know What waste gate I am going to need for this application, I was thinking 50mm?

Im also going to buy a CHEAP OBX manifold and Modify it to my liking and port it to flow some good numbers at the machine shop. ( I figured the hours involved in making one from scratch and the materials required and Im Money ahead in buying a cheap one and Modifying it).

I also like the V-band clamp wastegates, Everyone I know says the seal good. Anyone on here have one?

[fast_s14]

My rb25 isn't running yet but i am going with the tial 44mm with 1 bar spring.

my set up consists of:Gt3076r turbo6boost manigreddy type r bovtial 44mm

[rb25drag]

From what I have read the 44mm is only good for about 1-1.4 bar, which I could possibly run over 1.5 bar IF my setup goes as planned. I think the 50Mm will cover it, But I would like someone to confirm my theory.

[craz4240]

Synapse 50mm v-band gate

[BHFR-GTR]

im running twin synapse 50mm on the fullrace mani-rb26

[Cjmartz2k]

The higher the boost, the smaller the WG can be. It seems backwards, but it's the truth. Also, how much are those XS power mani's? I would strongly suggest the Stec ones that Fearsometea had up here a while ago. I'm running one now and think it kicks ***. They are only $400, so not super cheap, but way better quality than that ebay crap.

[rb25drag]

The higher the boost, the smaller the WG can be. It seems backwards, but it's the truth. Also, how much are those XS power mani's? I would strongly suggest the Stec ones that Fearsometea had up here a while ago. I'm running one now and think it kicks ***. They are only $400, so not super cheap, but way better quality than that ebay crap.

so your saying a 38mm or 44 would work?I seen those synapse gates, seemed to be a decent price, just wasn't sure about the quality. So what kind of boost are you guys pushing with them?Also the manifold you suggest, I would like some more info on. Were can i find one? I would give 400$ for a decent mani. I just don't have 1500$ for a full race. im a poor man. Also is it a top mount mani? Also for the s13 hatch guys with top mount manifolds, how close is your hood? any problems shutting it?

[240z4u]

Yeah smaller gate for higher boost is fine, it has to bleed off less exhaust pressure to control your boost. The real trick is having an efficient setup to get the exhaust to the WG and out of the WG.

I am running 23psi as we speak perfectly fine on my tial 38.

[S14-NEO]

im runnning a Greddy 50mm gate on my setup....works like a charm

[Darius]

Like a few have said, you don't need as big of a gate with a big turbo since you're sending a majority of the exhaust gases thru the turbine and not bypassing. Most can get away with a smaller 38mm gate that results in better response.

There's a thread on skylinesaustralia about it and Sydneykid describes his method for calculating diameter. I'll see if I can find it and link here.

[Darius]

BINGO! Found it...about half way down on the first page for the summary, then in greater detail towards the bottom.http://www.skylinesaustralia.c...+size

And v-bands seal well if they have a male and female side, which Tial's do. I have a v-band without the groove and hub (for lack of better terms) on my turbo (which came from ATP), and I can't get it to seal perfectly. If I put both flanges face to face, I can slide them past eachother. Sucks because I'm constantly worrying if it is throwing my wideband off while I'm trying to tune. With the hub and groove, they align and interlock for a better seal. Vibrant makes their v-bands like this.
Modified by Darius at 8:44 AM 8/22/2008

[240z4u]

BINGO! Found it...about half way down on the first page for the summary, then in greater detail towards the bottom.http://www.skylinesaustralia.c...+size

And v-bands seal well if they have a male and female side, which Tial's do. I have a v-band without the groove and hub (for lack of better terms) on my turbo (which came from ATP), and I can't get it to seal perfectly. If I put both flanges face to face, I can slide them past eachother. Sucks because I'm constantly worrying if it is throwing my wideband off while I'm trying to tune. With the hub and groove, they align and interlock for a better seal. Vibrant makes their v-bands like this.

Modified by Darius at 8:44 AM 8/22/2008

Nice tip on the vband scenario. Thanks.

[SullivanRacing06]

im runnign a 60mm spl vband wastegate with a screamer pipe, running, 21-28psi, with no boost creep

[rb25drag]

Thanks Darius, That link summed it up. I think for my range a 38mm will be perfect size.

Ya my buddy runs the V-clamp on his Turbo Mustang its very nice, makes installing easy.

The New Precision turbo I have is a V-clamp, so im going to buy a wastegate like that also, Make it all match and be easy access.

Are you guys running the wastegate threw your exhaust or just an open DP?

I Don't plan on putting any type of exhaust on it, Im running open down pipe as for now, I might bring a straight 3 inch pipe out the side so it can throw the flames on my competition at the track

[BHFR-GTR]

my car is a s13 and with the gt40 and full race mani, the hood wont close, its hitting right on the bracing, im gonna cut back some of the bracing and i will let you know i may have to have a eclipse style dent in my hood oh well

[rb25drag]

Cool, let me know how that works out.

If my hood hits, Ill Cut it out, Put a HUGE spacer and raise it above the hood so it will catch fresh air

LOL, J/k

[BHFR-GTR]

hahaahaha thats what im talking about

[rb25drag]

Kinda like this guys, Except only 1 turbo

[rb25drag]

Im assuming this is the manifold you was suggesting?

http://www.stec-motorsports.co...m=014

[Cjmartz2k]

Yup, that's the one. I'm real happy with it.

BTW, I was running a HKS 38mm wastegate with my HX35/40 hybrid which was a T3 flange, and a small turbine wheel compared to the compressor, so I had to bypass a lot through the wastegate compared to most, and it didn't creep as low as 1.2 bar of boost (that's what the spring was).

[rb25drag]

Sweet thanks for the tip, I def like the looks of that manifold better than the Ebay one.

How close are the ports matched up to the gaskets? Could the manifold use a port N polish for better flow?

[gawdzilla]

interesting that the s-tec manifold comes with a wastegate. all for just $520. i can 99% guaruntee that the setup won't fit in an LHD car without modification. so save your port n polish/gasket match money to move the wastegate...

[rb25drag]

Im sure I will modify the manifold in more than 1 way. I don't look for it to fit directly, Thats why im going to buy something cheap just as a mock up and modify it to my liking and clearances of everything. Will be easier in the end vs building one from scratch like I originally planned.

[SullivanRacing06]

interesting that the s-tec manifold comes with a wastegate. all for just $520. i can 99% guaruntee that the setup won't fit in an LHD car without modification. so save your port n polish/gasket match money to move the wastegate...

yea sorry to say but that manifold will not fit, ull be better off buying a ebay manifold, having the flange that meets the head shaved so it will not be warped, ave a local exhaust shop move the wastegate so it faces foward, and buy a real wastegate for gods sake, dont trust a 90$ fake wastegate, spend the extra money and have a name brand wastegate under your hood

[rb25drag]

it says right on there site it will fit any RB swapped s13 or 14. So what won't fit about it other than having the wastegate moved?

If I buy it Im buying the manifold only, Im not buying that cheap wastegate.

[gawdzilla]

it says right on there site it will fit any RB swapped s13 or 14. So what won't fit about it other than having the wastegate moved?

If I buy it Im buying the manifold only, Im not buying that cheap wastegate.

"RB swapped s13 or 14" doesn't mean LHD. RHD cars can do the swap too.

website says "It is unknown with LHD cars if they will clear the steering". Just looking at it, I can tell you it almost certainly won't.

[SullivanRacing06]

agreed, buy the ebay manifold, get the flange flantened out ny a machine shop w a belt sander, and get a local exhaust shop move the w/g flange, get a 38mm or 44mm w/g thats name brand

[rb25drag]

Cool Thanks for the tips guys, Ill be back with pics and stuff of the setup once complete.

[rb25drag]

This looks like the best quality built manifold on ebay. Anyone running one on here?

http://cgi.ebay.com/ebaymotors....m245