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240Z Turbo

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About 240Z Turbo

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    http://www.eng.fsu.edu/~jthagard

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    Charlotte, North Carolina
  1. used L4N71B on a for drag racing and went ~129mph in the 1/4. Tranny held find, but due to excessive pressure it pushed out the front seal so definitely needs some additional case breathing. Biggest issue was getting someone to build a good converter and options were few and far between. Here is a link to the valve body mods. http://www.eng.famu.fsu.edu/~jthagard/4n71b/
  2. 05L head use

    I also have an O5L head that I plan to use for my son's build so thanks for posting the pics. If you can provide some wall measurements for the intake & exhaust ports that would be great. I was the one who posted P90 cross section pics and the link is below. http://www.eng.famu.fsu.edu/~jthagard/3liter/pics/P90/
  3. Compare your Dyno sheets HERE

    Nice results TimZ!
  4. The car actually made more torque, probably over 550ft-lbs @ wheels. The dyno graph below was running 28psi balls rich with no nitrous. At the track I would run ~20psi and spray 125shot. I ran it like this for many years with no issues, but you need to make sure the car is not detonating or it could be disastrous.
  5. I ran race prepped (peen & polish) 240Z rods making over [email protected] and trapping 134mph in the quarter. Stock prepped rods are suitable for your goals.
  6. Purchased a decent 1971 for $1500. Going to build this car for my son who is currently 13yo, which is about how long it has been since I sold my last 240Z. I will start a build thread when the time is right, but expect it to be turbocharged and likely a hybrid of new school and old school parts.
  7. L28ET custom exhaust manifold experiment

    1.06 a/r T4 TS from ATP on the current setup. Keep in mind that ideally you should pair it with a TS header with dual (separate) gates. You would need to measure exhaust back pressure (EBP) to understand if the housing is sized appropriately for a 2.8L, but for sub 600hp I think it would be a good option. I think ideally you want to see 1.5x boost pressure when measuring EBP. As a note, the new TS turbine housings from Honeywell are actually sized to have equivalent cross sectional area to an open scroll. So a 1.01 a/r T3 TS would have the same flow as a 1.01 a/r T3 OS.
  8. L28ET custom exhaust manifold experiment

    Yes, the EVO manifold is sch10 from Treadstone. The advantage is that you have the ability to get tight radius bends that are not otherwise available with standard 0.065" stainless. For an L28 manifold it would be more suitable since there are space constraints. I also found that short runner manifolds do hella-good for spool on a street car where response is critical. I may suffer on the topend vs a long runner manifold, but I really like the boost response. On my 2L I make 27.3psi @ 3848rpm with a GTX3576r and 27.4 @4351rpm with a GTX3582r both logged in 3rd gear.
  9. L28ET custom exhaust manifold experiment

    Sweet looking manifold and the design is unique. As others have stated put the slips on the straight legs after the 1-2 merge and 5-6 merge. A single slip can have leakage, but it is not typically audible and more so that you can see carbon blow-by over time. I personally prefer a double slip over single just because and that is what I use on manifolds I fabricate. (sorry Tim ) As a note, the welds look hot so if you didn't use a flux paste or purge you could end up with cracking regardless of slip joints. Also, if this is 0.065" it should be 321SS and not 304SS or it will likely crack. FYI, this was the first 0.065" 304SS twinturbo manifold I made back in 2002, which ended up cracking. So we all learn from our experiences over time. This is a manifold I made for my EVO in 2012 and it is still going strong after 40K miles. Thick walled 316SS twinscroll with double slip joint.
  10. L6 turbo tube header

    FYI, just some pics I saved in the past of various L28 turbo headers. Contact Walker @ www.MPFAB.com and I am sure he can design/build a header for this application for less than $2500. http://www.eng.fsu.edu/~jthagard/Zturboheader/
  11. RIP John Coffey (johnc)

    Don't post much anymore since selling my Z 12 years ago. Just saw this post and wanted to say thanks to John for his contributions to the community as well as provide condolences to his family.
  12. L6 turbo tube header

    If you look at the picture below I milled ~0.125" into the flange to allow the round exhaust tube to mate properly. This was using a round port exhaust P90 head, but you can take the same approach with a D-port head such as N42. From there you can just port to smooth the transition as best as possible. Some feel the step is beneficial to reduce effects of reversion. It will be difficult to shape thick walled tubing to fit the port without the necessary tooling.
  13. L6 Intake Manifold GROUP BUY

    about 12 years ago I made a run of 10 manifolds that I believe sold for $250/per. Whether you jig or not you almost always get some movement, which is why I only used intake cores that had the webbing between the runners. This ensured the runners, bolts and injector inlets stayed aligned with the head after the manifold was welded. Looks like a lot of work to get this resolved without paying another $500.
  14. Back at it....

    glad you found it
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