hey i was wondering if i could swap out the turbo,intake,exhaust manifold,ecu,maf,injectors and distributor from a turbo 280zx into my 81 280zx and run low boost if so how much boost could i run with it and would it be faster than a stock 280zx turbo

 

you can run normal boost as long as you keep it timed right.. All that talk about detonation on a N/A is only true if it is not timed right or if you go crazy on boost. You should be able to run 8 psi without any trouble.

 

You probably wouldn't be faster either, because you'd have to retard the timing so much because of the higher compression. Run a higher octane and you can get away with more timing.

 

your 81 uses flattop pistons which run higher compression, dished pistons are used on the turbo engines for lower comp to run the usual 8-10psi of boost. an option is to change the intake gasket to a thicker one to lower comp. ( I have only heard this second hand so it is just something to look into if you are interested.)

 

the intake gasket has no bearing on chamber pressure... once the valve closes all that pressure is inside.. the flattop pistons crank out 8.5-9.5:1 where the dished make 7.4:1.. increasing the intake gasket would reduce the boost pressure (if im not mistaken) and wouldnt reduce it by very much..pretty minute

 

I think you meant head gasket right?? It will lower compression but it puts more stress on the gasket when you crank up the boost it wouldnot be good.

 

Yeah he had to mean the head gasket. But s/c is correct, it is risky.

 

wait you are saying lower compression + more boost = risky
????WHAT?

you mean higher compression+more boost = risky....
if he wants to lower the compression ratio taht is better and safer for runnign a turbocharger...

i am totaly lost in your explenation....

 

energy travels the path of least resistace.. puttin a bigger gasket makes the seal weaker as it has more gasket to push on(this is all that physics **** that we hate so much) and thus the gasket makes it weaker and, increasing boost.. although lower compression can still blow out the gasket if not careful..

 

no you just got me confuzzled a little when you mentioned lower comrpession was risky..which is what you want with a turbo lower compression...i didnt realise you were meaning that..alrighty got that all cleared out..

 

If you use a thicker gasket, make sure it's a metal head gasket like what HKS makes, it you're going to use a lot of boost. Those things will take a lot of pressure before they give out.

Still better just to use lower compression pistons.

 

Definetly better to use the dished pistons, but if you dont the power of the combustion is going to the Head gasket and you may blow it. There is a person on Hybridz.org that is running a 9.5:1 CR and 10 pounds of boost, he has been threw 4 headgaskets in six months.

 

im using dished and a metal headgasket....and my block has been o-ringed if i can get it back from the damn shop already!!!! GRR!!!!

 

That sucks, Mt engine will be done on Monday. . I put it in on Thursday, Sorry had to brag, to bad I will be in FL and wont be able to stare at it

 

not to get off subject but, where at in florida? vacation. . . can't wait for mine. . . but, slighty back on subject would building up a L28ET for power be worth it? or would i be better off swapping out different motor altogether, but, i don't want to do a V8 swap. . . would a VQ30DETT be too pricey to consider?

 

my pesonal opinion.. id stay with the original motor and work on that.. you can easily for 1500 put out about 450+ horses if you play your cards right... i like the balance of a straight 6.. no V6 could ever make as much power as an I6.. and an I6 could make almost as much power as a V8 so to me a V8 would be unnecessary and to go from I6 to V6.. bleah.... and the cost it would take you to get the engine and all the tubing and piping and various parts needed for conversion.. you could easily put the same into the L28ET and get alot more

 

People talking about detonation problems with turboing a NA 280z...Why not just get an intercooler and EBC from greddy? I have an 83 280zx NA Coupe..I was just gonna get the turbo manifold, oil pan, wiring harness, ecu,and intercooler from junkyard, then get a nice big turbo from greddy with electronic boost control..? I'd have to upgrade injectors and pump though...Any thoughts? The boost controller would help alot though, just keep at 6 inless you're at the strip..

 

I think you've got the right idea, xsciuga. You'd need the turbo ECU (and as far as I know, the wiring harness?) as well. Otherwise, looks like you've got the idea.

 

Anyone know if I'll need the MAF off turbo models? I suppose I'll find out once I get the harness...I'm trying to mentally make a list of everything I need...at the local "You pull it" junk yard, you can buy complete engine for 200$, Or each peice individually...Also can buy an intercooler for 30$..I wanna find a turbo motor, yank the whole thing, and systematically go through and switch all the parts that are differ..So basically, making a stock l28 turbo, w/ 8:5:1 compression...running with NO accessories and intercooler...Think 250 or 275RWHP is plausible. I'm also looking into stage 1 system from NX..adjustable from 25-50-75 At the rear wheels...Hmm 500 bucks...Heck, just that kit should put my NA somewhere into mid 14's? I'm probaly pullin 140ish to the wheels right now..and it's completly stripped...What do you think? All advice is GREATLY appreciated, I just got the car and don't know much about them(am learning), I'm just making generilzations.

 

Well, looks to me like you're generalizing correctly. I don't see any flaws in your thinking logic, in fact it sounds almost spot-on to what I've read in the past.

Yes, I believe you'd need the turbo MAF ... I'm unsure about any other accessory differences.

 

....not this again...

 

Hey at leas we got it down to once a month and not once a week like it used to be. EVERY WEEK used to be "is it possible to turbo an NA motor?"

 

my suggestion would be.. you wanna turbo motor?? go buy one! its cheaper that way..

 

dont make me mad....


yes you need the turbo MAF ...or you can ditch the thing and replace it with MS i just bought my unit...MS has a built in MAP sensor so you dont need that flapper pos

also since you just got the car and are learning...maybe take a lil deeper look at the concept of these engines and the turbocharged ones and see what it takes, how it works...sometimes reading other peoples articles or posts doesnt get you anywhere...i have done that...before i bought anything, i emailed a few people from zcar.com and hybridz.org on different turbo selections and powertrain, fuel controllers, actual engine work etc....ive learned alot doing research but be carefull there is yahoo's out there who sometimes arent the best source for information...i still have the email that i got from Jeff P. about good turbo selection if interested...

 

here.. this will prolly give you the best info with diagrams etc... on basic setups.. parts.. etc..

http://www.atlanticz.ca/zclub/techtips/turbo/index.html