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#26 (permalink) | ||
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Project 1450 supporter...
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Location: Pleasant Valley, CT
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Real Name: Bob Legere
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 Last edited by RallyBob; 06-13-2008 at 12:20 PM. |
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#29 (permalink) | ||
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Supercharged 2.4
Join Date: Mar 2006
Location: Oregon
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They'd all likely be built to order because everyone is going to want something different. Alternatively I've given some thought on what it would take to make the header capable of accepting adapter plates so the end user could make the choice of what turbos will meet their needs and still fit. It's a good thing shipping isn't part of the declared value. Thanks for the info.
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1972 Opel GT: 2.4, big brakes, efi - inprogress
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#30 (permalink) | |
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Project 1450 supporter...
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How much then?
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How much power are you honestly looking to make? Remembering a stock 1.9 Opel makes 45-55 wheel HP, is 200 whp a target...or more? The Garrett GT2554 turbo I bought for my Opel wagon can support up to 240 hp, and that's about as small as they come in a ball-bearing T25-style turbo (T25 is the family of turbos, it's defined by the small flange dimensions). I'm (really!) not trying to complicate things, just bringing some potential issues to light before they confuse matters more and skew the whole project. Bob
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#31 (permalink) |
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Project 1450 supporter...
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Real Name: Bob Legere
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__________________
My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#32 (permalink) |
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Supercharged 2.4
Join Date: Mar 2006
Location: Oregon
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Good point. Building the header to fit a small common turbo is probably the best and most cost effective way to go.
200hp at the wheel is plenty from the 1.9 at least for me. I am not sure what everyone wants from a turbo 1.9 but my goal is to make boost nice and low in the RPM range. An increase in torque is what I am really looking for, max hp is irrelevent to me since the engine will never see those rpms on the street.
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1972 Opel GT: 2.4, big brakes, efi - inprogress
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#33 (permalink) |
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Project 1450 supporter...
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__________________
My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#34 (permalink) | |
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Project 1450 supporter...
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In order to make a 'big' turbo work on a small lower powered engine, you'd need to modify the engine not only for strength, but for breathing (cam, head porting, etc) so it doesn't run into compressor surge in normal driving conditions. So as you said, sizing the manifold for a small turbo that can make between 150-250 hp and spool up fast is a better choice. You can increase the hp just by increasing boost if you want to (and if octane + tuning allows it). Bob
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#35 (permalink) |
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Rice Cooker
Join Date: May 2002
Location: Spring Church, PA
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This is partly why I asked about flanges - the header could be left with a collector so that others can add any flange they want. I'd be good with the T25 flange since space is at a premium in a GT. Good suggestion to go with one flange type and others can either follow or make their own. Getting this in stainless would be pricey I'm sure, but wouldn't it essentially last forever? Any chance they'd come in under $600?
Todd
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"In the end, it's not the years in your life that count. It's the life in your years." -Abraham Lincoln ________________ 1972 GT 2.4L 1974 Manta GT/E 2.2L 1973 Manta Rallye 2.5L |
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#36 (permalink) |
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Project 1450 supporter...
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Not so simple as I explained before. The flange dimensions vary greatly, so a collector for a T25 is too small for a T3 flange, and vice-versa. And the location of the collector (and therefore flange) would likely change as the turbo size grows due to clearance issues. I think this is a perfect example of the 'Choose any color you like as long as it's black' mentality you need to make this work. Space is at such a premium you won't have the luxury of making one size fit all.
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#37 (permalink) | |||
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Supercharged 2.4
Join Date: Mar 2006
Location: Oregon
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Also what was the price on that turbo?
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1972 Opel GT: 2.4, big brakes, efi - inprogress
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#38 (permalink) |
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Detritus Maximus
Join Date: Jul 2002
Location: St. Louis MO
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A correctly designed mild steel non-turbo header would be nice. Short of that, I'd be happy with a tubular version of the stock exhaust manifold. Keep the same headpipe flange location so that it could be bolted in place of the stock manifolds and it would fit any 1.5-1.9 Opel.
Does anyone know if a thin copper gasket would work well with the exhaust/intake combo on the Opel? I really liked the copper gaskets used on the Alfa exhaust, but I don't know if it would be good on the Opel given the manifold arrangement. A single gasket like the stock one (is a copper gasket okay for the intake portion?), or a separate copper gasket for the exhaust only (would this cause too much of a problem with a decent seal for both gaskets?)? I don't mind having to make the raised compression rings by hand, that is relatively easy. Would the copper be good for a turbo set-up?
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"No, it's not fiberglass." "No, the motor is not in the back." "No, your friend in high school did not 'peg' his speedometer." |
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#39 (permalink) |
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Supercharged 2.4
Join Date: Mar 2006
Location: Oregon
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It sounds like you basically want a tubular "sprint" manifold.
I think the plain header project is in the works. I'm not heading that one up so I can't really speak for anyone. Personally I think those would be the easiest to make. I still haven't heard back from my welder friend. I'll be calling him tonight and post an update afterwards.
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1972 Opel GT: 2.4, big brakes, efi - inprogress
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#40 (permalink) |
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Oldpiler
Join Date: Dec 2003
Location: Seattle
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You can count me in for a stainless flange for sure. I want to make a header for my rally car and stainless has better scavenging and less radiated heat.
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Be warned, it makes a mess and a lot of smoke so have plenty of ventilation. Trust me, it works. I used to restore old British cars. - Dave Clark current Opel stable: 1980 Ascona B rally car |
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#41 (permalink) | |
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Detritus Maximus
Join Date: Jul 2002
Location: St. Louis MO
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"No, it's not fiberglass." "No, the motor is not in the back." "No, your friend in high school did not 'peg' his speedometer." |
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#42 (permalink) | |||
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Project 1450 supporter...
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HTH, Bob
__________________
My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#43 (permalink) |
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Non Civilian
Join Date: Mar 2003
Location: Between Chico and Sac, CA
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Would the IHI VF24/24/29/38 turbo fit? Or even Mitsu TD04? A GT/Manta?
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#44 (permalink) | |
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Project 1450 supporter...
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TD04 housing on left, complete VF22 on right. The VF22 relative to the 1.9 EFI intake. For a 'small' turbo it takes up a lot of space! The Garrett GT2554 turbo is smaller overall than any of the Subaru TD04 or V-series IHI turbos BTW.
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#45 (permalink) | |
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Supercharged 2.4
Join Date: Mar 2006
Location: Oregon
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Update: I still haven't heard back from the welder. I suspect he may be on training with the National Guard since he doesn't usually take this long to get back to me. I also know another welder looking for additional work. I left a message with him today. At the very least one of them should get back to me.
What kind of power would you realistically see on a mostly stock engine (EFI is a must as I see it) at 8lbs of boost?
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1972 Opel GT: 2.4, big brakes, efi - inprogress
Last edited by Gumby; 06-14-2008 at 07:21 PM. |
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#46 (permalink) | |
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Project 1450 supporter...
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I was planning to run 14 psi, still well within the turbo's efficiency range and it should be almost lag free. It would actually be 'laggier' with less boost.
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#47 (permalink) |
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Rice Cooker
Join Date: May 2002
Location: Spring Church, PA
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How much of a factor is the 1.9 EFI plenum when turbocharging? Are there any suggested tips or changes (i.e. porting) to make to the plenum?
Todd K.
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"In the end, it's not the years in your life that count. It's the life in your years." -Abraham Lincoln ________________ 1972 GT 2.4L 1974 Manta GT/E 2.2L 1973 Manta Rallye 2.5L |
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#48 (permalink) | |
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Project 1450 supporter...
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Unless you have a big-valve head and a big cam for high rpm use and a big turbo, don't worry about it.
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#49 (permalink) | |
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Supercharged 2.4
Join Date: Mar 2006
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1972 Opel GT: 2.4, big brakes, efi - inprogress
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