[L28ET swap Turbo AFM question]

Thank you for that link, great help indeed and it looks like the AFM belongs there. So for you guys that have gone to MS, this may sound like a lame question but I need clarification on it. You need to go to a 240sx Throttle Body for the TPS switch and it looks like you need to use a spacer even after you port the intake, and do some guys keep the AFM or is it eliminated all together by the use of a sensor located in the intake manifold after the throttle body?

[L28ET swap Turbo AFM question]

Thanks to everyone's PMs and posts and the sticky's that talked us into doing a L28ET swap for my son's '77 280z project. The original motor and 4 speed is finally sold, we bought a '81 L28ET complete with AFM, wire harness and ECU so we are off and running and spend hours a day searching and reading about everyone's swaps. I've found that the search function is great but unless you happen to type in the correct "key phrase" you can waste a lot of time looking for stuff.

 

We just scored a '75 N42/ non EGR intake so I'll need to drill and tap the bottom PCV location to be the same as on the Turbo intake, can't wait to clean up all that emissions stuff! As of today we are using a 5 speed and R200 from a 2+2 with the 240mm clutch.

 

My question is in regards to using the turbo AFM, that thing is huge and I read that most guys relocate it somewhere else like on the core support. Has anyone just cut the inner fender and fabbed a new section to allow mounting the AFM in the stock location? It seems like it would be less work for me and fit well in a stock location.

 

I'm not sure we have budget for a MegaSquirt system but it sure sounds like the cool way to go but I gotta tell you guys, my brain gets tired reading about all the various MegaSquirt configurations and all the acronyms associated with this swap but if I understand it correctly, it eliminates the huge AFM which means no fender fabrication or relocation, and allows for future addtions and increased power when my son's budget allows for all of it.

 

The MS board looks pretty easy to assemble (way cheaper than a prebuilt board) but testing it would be a concern and maybe worth the extra cost of buying an assembled board, we don't know but I do know we would have to save as much money as possible on something like this if we go this way. I'm also not clear on which is the easiest throttle body to use if we go this way. Whats everyone's thoughts on this before I start cutting metal to mount this AFM?

 

I'm at the point where the body is stripped of all parts and we are media blasting it and replacing sheet metal as needed. I'd like to get this engine bay figured out, the oil cooler location pinned down, the AFM mounting fabricated, and all other welding and fab work planned before I procede further. We also picked up a Neon SRT-4 intercooler to use (real cheap), yes, its not the biggest intercooler but it seems like it will fit very well with the end tanks reworked and will support a reasonable 250-300 HP build plus it only covers a portion of the A/C condensor and radiator. Getting the 2 1/4" piping routed using the stock fan and shroud may be an issue, not sure yet.

 

Thanks for everyones support and experience with our project.

Scott and Cameron

[WTB N42 intake-EGR free]

Thanks, pm sent.

[Exhaust Manifold needed]

I've got both an N47 and N42 if anyone needs one.

[L28et turbo flywheel]

OK, I'd like to upgrade to the turbo flywheel with my swap, but can I run a turbo flywheel and starter with the NA 5 speed or do I need to find a BW 5 speed?

[WTB: s130 NA support between block and transmission]

I have one but I'll have to remove it from the car its on, how much do these things sell for anyway? Make me a fair offer.

 

Thanks,

Scott

[L28ET flywheel and starter question for swap]

OK, I've done my due diligence and have been searching the archives for the last couple hours for this answer. When installing a L28ET into a 280 while maintaing the 280's 5 speed,

will the turbo flywheel and turbo starter mate up with the '77s 5 speed? I know the '77s five speed, flywheel and starter will work but what about the turbo parts.

TIA,

Scott

[WTB N42 intake-EGR free]

Looking for a N42 intake, no EGR.

 

Thanks,

Scott

[L28ET ECU question]

I'm looking at installing a '81 L28ET engine complete with harness and ECM into my '77 280 but it came out of an automatic car. Can I use the ECU from an automatic with a 5 speed, I know the ECUs have different part numbers between manuals and autos.

[L28et turbo flywheel]

Whats the difference between the turbo flywheel and a NA motor flywheel? I'm looking at a L28ET to drop into my '77 but it had an automatic with it and my car has a 5 speed.

[280z compression increase]

Thanks guys, I found the Lengine calculator which is a quick easy reference. It appears that with flat top pistons, they may actually stick up past the deck by .03mm. If I just have the pistons flycut .50mm combined with a standard head gasket and a 44.6cc head I end up with a nice streetable compression of 9.30, and an acceptible quench which should work nicely with that little cam, this all assumes that the ITMs have enough material to trim. What do you guys think?

[280z compression increase]

Greetings everyone. I've tried posting this question on another Z car forum but got very little specific feedback (I'm sure its been covered multiple times but I can't find archived posts with specifics).

 

My son just bought his first car, a '77 280X that we are rebuilding. We just gutted it down to the bare body last weekend which was fun and a great experience for him. My question is in regards to the engine performance mods. We currently have a N42 and a N47 head since that is what came with this project. (the N42 appears to have been rebuilt), the bottom end is still stock with the dished pistons which I understand yields a 8.3:1 compression ratio with these heads.

 

I'd like to bump up the compression to around 9.8 and use the new cam that came along with the car. It is a reground External oiled cam on a Nissan core by Delta camshafts with .460" of lift and 260 degrees 212@ .050" so perhaps I should be looking to stay around the 9:1 compression target.

 

I need to CC whichever head is best to use to verify actual compression ratio and figure out which head gasket to use. Its been suggested that an umilled N42 and flat tops with a Nissan head gasket puts this in the 9.8:1 ratio. I've read multiple ways to increase compression on the various Z forums but haven't found a real concrete answer. Do I install new ITM flat top pistons (with or without the two valve relief cuts) and just use one of the above heads OR do I need to find a P79 or P90 head to use flat tops. I did find datsungarage.com in which he mills a N42 head .080" and uses the dished pistons, is that a better way to go??

 

I'm sure this has been done multiple times before but I'm having a hard time finding all the info in any one spot. Which way provides the best bang for the buck?

 

TIA