2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

twin s5 turbos

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Old 11-22-06 | 06:48 PM
  #26  
2STROKE's Avatar
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From: Darwin, NT, Aus.
Yeah mate... Heat sheilding the **** out of her . Also extra heat sheilding above them stuck to my c/f bonnet.

I should expect full boost by 5500 apprently. Should be a laugh. I'm a fan of the laggy motor's + big boost. I'm hopinh to do a few things that'll bring it down to about full boost at 4.8ish hopefully. I've got a really good EVC and a very good wastegate. Wastegate shoots to atmo off a screamer.
Old 11-22-06 | 09:41 PM
  #27  
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Originally Posted by Worm Burner
RETed : Thank you for your reply. As I said that was the theory behind it, one which doesn't worry me. I was simplely explaining why the manifold looks "wierd" I'm quite happy for anyone to pick holes in it, I just get irritated by condescending replies
Yeah, I know what you mean.
Having all those pipes isn't easy!
We're trying to build a triple turbo'd 20B, so can you imagine one more set of pipes???

I'm 100% with on the turbo's being to large. Even on a BP they were only seeing positive by about 3300 from memory and the boost curve was "interesting". Just my personal opinion, but not what I call streetable.
Don't suppose you got any kind of graphs laying around?
Dynos by any chance?

One of the "problem" areas is possible reversion with the Y-pipe at the compressor outlets.
I've heard of others running twins who had problems with reversion causing all kinds of headaches (usually blow-off valve problems), with the merge...


As for that joiner loosing to much effiency, I'm not technically literate to argue that effectively. I'll simplely point out that in the TT manifold made by amemiya (for 1st gen, 2gen and 3rd gen) always have the runners bridged by an external wastegate. If this is an arguement for that theory or because internal wastegates weren't upto the job don't ask me.
Yeah, I find it funny that people are calling their custom installed "full parallel", but the merged wastegate pipes induce reversion by design.
You're right.

"Unique" is right.
This is one of those projects which always raise eyebrows when you pop the hood!
Kudos on the uniqueness!


-Ted
Old 11-22-06 | 10:20 PM
  #28  
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Will put up pictures of everything when it's done. Including dyno graphs.
Old 11-23-06 | 12:28 AM
  #29  
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Go Team Womble *)

 
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Thumbs up

Originally Posted by RETed
Yeah, I know what you mean.
Having all those pipes isn't easy!
We're trying to build a triple turbo'd 20B, so can you imagine one more set of pipes???
Man and I though I was brave. 20b triple turbo in a 2nd gen!?! That's going to be some intense plumbing (especially for the wastegates? You are having more than one?) I know very well just how tight it can be. Thought I had it all sorted, then only to find out the first turbo's wastegate hit the steering arm.

Have you considered a similar setup to the manifold's at Kiwi RE and using twin s5 turbo's? (assuming your planning on using "budget" turbo's.)

Originally Posted by RETed
Don't suppose you got any kind of graphs laying around?
Dynos by any chance?
Unfortunately I don't have any of this setup =( . If your interested in mine I'll be happy to post my next tune's one. (Couple of weeks from now).

Originally Posted by RETed
One of the "problem" areas is possible reversion with the Y-pipe at the compressor outlets.
I've heard of others running twins who had problems with reversion causing all kinds of headaches (usually blow-off valve problems), with the merge...
My setup doesn't actually have a Y pipe. Piping joins the IC seperately. Presumeablely the pressure drop across the IC core might help dissipate the shockwaves/backwash slightly.
Old 11-23-06 | 01:06 AM
  #30  
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Originally Posted by Worm Burner
Man and I though I was brave. 20b triple turbo in a 2nd gen!?! That's going to be some intense plumbing (especially for the wastegates? You are having more than one?) I know very well just how tight it can be. Thought I had it all sorted, then only to find out the first turbo's wastegate hit the steering arm.
External WG's would've been HORRORS!
We're using internal WG's.
And no, this is not a budget build.
We're using $3,500 worth of Garrett GT2871R's.


My setup doesn't actually have a Y pipe. Piping joins the IC seperately. Presumeablely the pressure drop across the IC core might help dissipate the shockwaves/backwash slightly.
Ah, good idea...
Forgot about running seperated inlets to the IC and let it collect on the outlet side of the IC...
We've already for the IC core installed.


-Ted
Old 11-23-06 | 06:17 PM
  #31  
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Go Team Womble *)

 
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RETed : Yere 3 external wastegates wouldn't be something I'd attempt, having said that would be slightly easier in a US car being Left hand drive compared to here. Still oneday I might be stupid enough if the dreams off an 18a ever get off the ground. Worked out where the dump pipes are going to collect yet (how far back from the turbo's basically)

GT2871R, nice selection. 56 trim & .64 rear housing? or going for a .86 housing? Make's my td05's look like dinosaurs anyway Not to mention you can actually find compressor maps for the garret turbo's...


2STROKE : How much longer have you got to wait till you can drive her? My wastegates are plumbed back. Requirement for insurance, and I don't want too much attention from the cops
Old 11-23-06 | 10:40 PM
  #32  
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Doh, forgot about the LHD versus RHD!
0.86 A/R's on the turbines - top end power!


-Ted
Old 06-10-07 | 07:50 PM
  #33  
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Go Team Womble *)

 
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From: Australia
*Back from the dead*

Not my dyno chart (don't ask - no freaking time), but a twin s5 turbo with 12a rear housings. This is using 98 octane fuel/gas.

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