well, i didnt intend to do it, but when you get offered a 280Z for free locally its hard to turn it down. needs floor boards (which i got spares in my shed) and a motor (which i got spares in my shed) so yeah.... im back!



however i will have to assemble this motor im going to rebuild an N42 head for its use probably mill down the head a little to up the compression and also thinking of nabbing some high comp pistons. if i did so and didn't go carb setup and stuck with the original EFI setup think with all that up compression i can get away with stock injectors? or should i go turbo injectors? or SAFC it? or just get a secondary injector to activate on WOT? i know i got a question weird right? well i've never tackled the high comp NA engine before so yup its legit. oh and that question is pointed more towards nismo shady 260z and bleach. doubt any one else on here would have to much input to add, shady would probably be the best since i know he upped the compression on his motor and is rocking stock electronics for the most part!

 

i'll never understand the purpose of directing a question at specific forum go-ers.
but that's pretty sweet that you're getting a Z again. is it home yet?

 

this weekend..... and i don't mind other input i just know those guys and shady specifically have first hand experience in the matter. so if you think you got a good take on it lets hear it! but.... i didn't think so :P

 

Well maybe some of us know a thing or two about high compression n/a engines. If you are gonna up the compression by to awful much you will want to increase your fuel, and unless you are gonna go with a programmable ecu to adjust to the higher compression and stuff, then I would highly recommend going carbs. A nice little triple carb setup would suit you just fine. Anyways I`m not Nismo or Shady so ignore my input. Grats anyways.

 

and thats already what i stated ^^^^ which is why im waiting for just ideas from the others. re-read what i said, its an NA engine so i WILL NOT put money into an EFI system for it not worth it, i highly doubt i'll go carb however if i do (and the only reason i would is if the wiring harness is ripped from this car) it will be triples or a 4bbl. however, as i stated, excluding THOSE OPTIONS for now, what would be a good route to go by in order to use the original EFI system. dont get butt hurt guys im more specific towards those people just because i now they have more read time over on hybridz and shady upped his compression a good amount and is using the original EFI system those are the only reasons im looking more towards them, i know many more people on here can help out with this problem in any old fashion, but digging down right to the bone of the exact setup i want to stick with those guys would be the best people to hear input from thats all.

 

I`m just giving you *****. Bigger injectors would probably let you get away with running higher compression, but requires a AFM adjustment. Good luck. Theres a link for that around somewhere searchy n00b.

 

theres no good posts about that on here or i would put the time into searching. and just checking. thats what im thinking i can get away with as well, but i could be wrong so im hoping to hear from the others

 

yeah i can't help you. didn't say i could. it just doesn't seem like the best way to ask a question especially when you are open to all suggestions. you're less likely to get them if you directed the question.

 

What?! No pics? I shall never return to this thread......

Turbo injectors will still be too big for stock efi... SAFC would only work on a MAF setup. You could do the Z31 n/a ecu swap, or save some headaches and go MSnS.

I've also thought about a secondary injector... but how to control it is the question. The L manifold in Maximum Boost is insane!

Just go ballz out and buy all them delicious parts you know you will need. $10k motor!!!

 

search noob

 

ibtl !

 

sweet glad to see you might stay in the game. since you have a dd why not just make something sick out of this z? with 9:1 comp n/a will you stay happy? the question is what do you want to do with it.

 

Dude... Don't be such a n00b. If you are wanting to stay NA.. Go triple Weber FTW.. Better sound, better response, yada yada yada. Way better looking, less mess to deal with, and it will get the chicks...
I lean in my hood all the time, and the chicks just flock to the triples.
"Wow, what are those?"

They're another 3 inches baby. Just another 3 inches.... uh... I mean carbs.

But seriously.

They will make your dick bigger. It's just science. All that barometric pressure and stuff. I can bring the math out if you really want. But, I don't want to spend the rest of the thread explaining myself to the n00bs.

If I were to build a sweet NA engine, I would go with the triples. They are my favorite thing about my Z. I love getting to play with them every chance I get. It's like having three extra ***** that can't get a girl pregnant, but they sure are impressive.

Know what I mean?

 

rb or gtfo!!!

 

lol. it will become a daily thats why i plan on keeping it mild. im not going to keep the sx a bike and a Z. im in college. i can keep the bike and the z or the bike and the sx or the sx and then build the z. but the bike is to much fun and having a properly functioning healthy Z will keep me VERY satisfied till im done with school. also, 9:1 compression ration? lol i was thinking more closer to 11:1 with a milled down head thin HG and high comp pistons. i suppose the Z31 idea could work, and i didnt take into consideration the AFM not matching the SAFC DOH! i n00b'ed that one haha. i may just have to try my own experimenting. and as for a secondary injector they/it could be simply hooked up to an inhibtor switch like the e-brake is on so once the pedal hits WOT it is engaged and sprays. just T into a fuel line section prior to the main injectors and you should have proper fuel line pressure to it as well then not to much not to little. but carb's would be the best way to go and in that case i'll be bummed i agreed to take this rusty 280Z for free over another only slight surface rust 240Z thats been in storage for a decade near me for 500 dollars. triple will be expensive as ***** though. we will see i may just have to make this a neat experiment diy project then and create my own answer. also, i'll get pics when i actually have some to post.

 

does that extra injector ever actually turn out great results? it just can't be the best way when your mixture ratio basically changes from 6:1 to 7:1 all at once. well not THE mixture ratio, but you know what i mean. in a sense. not to say it doesn't work. it just doesn't sound super to me.

 

Depending on what I get for a L28ET, if I don't trade my triples for it, I will cut you a personal deal Snw.

 

triple 2 Bbl Mikuni's!

edit...woah werid post 999

 

Glad to hear you're back with a Z!

FWIW, I didn't need any extra fuel delivery capacity on my higher compression NA setup; the stock EFI works fine. You're not changing the displacement, or adding a turbo, so it's not like you've got more air and need to add more fuel. You might have to run the high octane pump gas, though.

How mine's built:

'78 L28, bored .020" over, flattop ITM pistons w/ moly rings, ARP rod bolts, stock N47 head, Web 94a reground cam, 3 angle valve job, gasket match but no major head work, MSA 6:1 header and 2.5" exhaust, stock intake, and stock EFI (except for the Pallnet fuel rail).

So, mine certainly isn't a wild NA build; but, it is similar to what you're talking about. However, I have substantially less need of fuel here, because the lowest elevation my car ever sees is about 5000 feet. I do have to run the higher octane pump gas, but "high octane" here is 91. Illinois is basically all under 1,000 feet, but your premium pumps should be 93 octane.

Just my $0.02, but I'd stick with just cleaning up and tuning the stock EFI with your high compression setup. I'm just not a fan of the carbs (not putting them down, I like that other people have them, I just don't want to mess with them for my use at 5,000 to 11,000 feet).

congrats again on your "new" Z!
Dave

 

Leave the Z alone. . . .walk away. . . . dont do it. . . nothing but trouble

 

I'm ready to see some pics!

 

nice ^^^^ thats something im glad to hear about. yeah i knew i wasn't upping air intake necessarily but i figure with the higher compression ratio it would in a way be similar to adding boost.... thats why i figured i could knock away with the stock efi just wasn't sure how lean i would start to go. and im with you not a fan of carb's they are attention ****** and not reliable in the winter, though the stock efi system isn't something i would call very reliable either, but, i put a bit more faith in it than a carb setup. and yeah right where i am at i vary between 500 and 700 foot elevation right where i am at is like 675 i believe. i didn't know, Dave, you built your motor like that, pretty much the exact same as i want to go. very nice if i knew that i would have included your name in my first post haha. thanks that definitely helps alot. now i gotta ask.... how's that higher comp setup treat you?



lol at apollo, i've gone through almost every problem with a Z nothing i cant handle and i got till summer to have it on the road as far as im concerned so no big. you know you want to join the crowd again. also, pics im fairly confident, WONT be anything to gaze at. but once i have it im going to be tearing it all apart right away wasting away my free time over break making the body flawless new bushings and etc. then freshen up the engine, and then install time. then start adding goodies like suspension and etc. glad Christmas is coming haha. but yeah i'll have pics this weekend. sorry wont be sooner.

 

A rich fuel mixture helps prevent pinging but I wonder if the people suggesting the extra injector were thinking of that or thought it would be going lean with high compression.

if it can't run on premium fuel at whatever compression ratio you end up with, then a better fuel system should be used... or just turn back the ignition timing a little.

 

Id be careful with those free Zcars, they usually have major problems... Most of them just end up to be rust buckets in someones lawn =P But ya, it would be cool if you pull it off.

 

Exactly . .rusty piles of Japanese garbage with nothing but problems.

D.A.T.S.U.N.=

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