Hey every one i have a stock 1982 280zx turbo 7th month or 1982 it has a P90A head the list of things done are this a custom cold air intake i made with a k&n air filter , split fire spark plugs , new cap an rotor new ign wires , new fuel filter new fuel pressure regulator new jsk fuel rail , the car has a new turbo and new clutch i am running stock boost 5? 6? ive got it up to 6.5 but my question is with a manual boost controler were do i put it ? and what is the max boost i can set on it ? can i use the 280zx boost gauge ? i would like pictures of were to put the manual boost controller so i know i do it right the first time. Please some one help me that knows alot about what im tlaking about and yes i do plan on buying a HKS intercooler from ebay 1300 dollars when i get my tax return back in 2006 unless some one hear knows some one who can make me one ? please e-mail me whitetiger88101@yahoo.com or leave messeges hear thanks

1982 280zxt stage 2
1993 300zx n/a/ stage 2

 

max boost... 40 psi. DO IT! and why go for the cheap HKS $1300 intercooler? Buy the $3000 ones!

 

Ok silly i dont want to buy a new turbo next week ! lol silly what is the safest PSI boost i can go ? on a stock motor im running castrol sysntec motor oil 10-30 im running a 165 degree thermostate so im keeping my engine very cool please anybody know the safest boost with out blowing up my car?

 

If you plan on doing any changes to your engine... I'd suggest reading some mod'ing books before doing so. You don't want to do anything half-assed or "cuz I thought it would be cool!"

-Safe boost on a stock L28ET... 9 - 10 psi. Above that you really should be getting an intercooler.

-If you up the boost over about 8psi... you will need to modify the Pop Off Valve (emergency release valve) on the intake manifold, so it will not open yet... otherwise you just vent the boosted air.

-I call manual boost controllers "death traps." Cheap pieces of ****, and not 100% reliable. GET AN ELECTRONIC ONE.

-Anyone that buys a $1300 intercooler these days is absolutely nuts. BUY ONE ON EBAY FOR $200 SHIPPED!

 

i have to mod the emergency relive vavle ? the valve by the EGR valve right the pop off valve? or should i just buy a Blow Off Valve and weld it to my turbo J pipe am i right ? i just want my 280zxt to beat this one black 1998 corvette then i can just use her for a dailyer driver and enjoy her in all her bliss !! hear is the full list of stuff i have done cold air in take,lower thermostate 165 degree, 70/30 antifreeze, new cap an rotor new split fire spark plugs castrol sysntec motor oil 10-30w i degutted the cats so its a stright threw exhaust im useing a euro spec muffler straight threw 75-90 manual gear oil and 75-90 rear diff oil. JSK high capacity fuel rail with stock injectors and stock fuel pressure regulator so NISMO PICK u said 8psi to 9 psi is safe right ? im gonna hold your word to that . what should i do about the POP OFF VALVE ? and SHOULD i INSTALL A BLOW OF VALVE TO THE J PIPE TOO ?

 

it's gunna take more than 9psi boost & 70/30 coolant to beat a 98 Vette!

The emergency release valve is NOT a Blow Off Valve... The stock 280zxt's don't have bov's. All the release valve does, is release the boosted air above about 7.5 psi. It's there incase the wastegate malfunctions.

 

Ok so how do i fix this problem ? do i delet the pop off valve ? if so how ? what do i need to do ?

 

most people cap it w/ a 1" plug.... some say if you do that, you risk blowing the engine.

You can modify it (IF YOU KNOW WHAT YOU ARE DOING) by drilling out the rivet & adding several washers to make the spring stiffer. Or buy the aftermarket one from MSA for $100.

 

nismopick can u send me a link to MSA? for the popoff valve ? or if u have yahoo mesenger add me to your friends list whitetiger88101@yahoo.com im on yahoo mesenger RIGHT NOW>....

 

Hey i think i found one on www.zcarparts.com its the greddy blue pop off valve for like 135 dollars will that one be ok ? well honestly im pretty good with my 50,000 rpm dremel im sure i can mod the pop off valve myself =-) wish me luck !!!

 

Ok, you're in way over your head here. Split fire spark plugs, 70/30 anit-freeze and a 165 deg thermostat won't do anything for performance.

You should get two books first:

"How to Modify Your Datsun & Nissan OHC Engine" from Fisher Books

and

"Maximum Boost" by Corky Bell

Then, replace those $3/ea Split Fire spark plugs with NGK BPR6ES-11 spark plugs and plug wires and use the factory recommended ratio of anti-freeze and water. If you want to improve your radiators cooling ability, add a bottle of RedLine Water Wetter.

Playing with your engine at your current level of knowledge is at best going to be disappointing and at worst you'll be scrounging the junk yards for another motor.

Once you've read the two books above, you'll have a better understanding of how these systems work and then you'll be able to ask more useful questions.

 

I have both of those books.. Love em.. They are right next to the bible And I can vouch for the REDLINE watter wetter.. That ish works real good.. I lost 18* in 121* weather just by adding.. No joke

 

Ok u guys seem to be ********. U can run 12psi without an intercooler an without modifying the pov. The most efficient boost is 18psi on the stock turbo. And u should run over 12psi unless u run a intercooler. And u should run 91 octane or better.

 

He said above 10 you really should get an intercooler. Specifically to be on the safe side. I also imagine that with an older stock L28ET engine you're not going to want to run 12 psi of boost on it. Maybe if the engine were brand new you'd be less likely to mess something up. They're trying to give advice on what's safe to run and keep running for a while. I haven't heard of many cars running 12 psi on all stock internals with well over 100k miles on the engine.

By the way, L what is the factory recommended mixture of coolant, and water? Haynes guide says between 50/50 and 70/30. Anyway not like my antifreeze/water ratio is going to matter that much when I'm not turbo charged or hard driving.

 

LoL... who is this putz?

Go ahead & run 18psi... it's not my engine

ok ok... he's joking

 

wait a sec! you're the kid who wants to put Corvette brake calipers on your Z, instead of 4 piston calipers...

https://www.zdriver.com/forum/showthread.php?t=15201

 

now we know who not to listen to for advice

 

Holy crap why didnt I see this yesterday.. Good times.. cheers

 

I still really like the 40 psi idea... Should make some really neat cosmetic changes to the hood when it goes bye bye

18 psi on stock turbo with no other mods? Sounds awesome!
Tell you what, you go ahead and run your car that way for about a month of hard driving and come back and give us all a progress report. Who knows, you might be the only guy to correctly figure out the best maximum boost set up for a stock turbo

Rod.

 

ya "Maximum Boost" by Corky Bell that is the turbo bible i have it and befor i turboed my 240 3.1 stroker trip web side drafts i called him and belive it or not he still works at his copany. he actuly told me the best way to do the set up.

 

im looking for advice for my 1982 280zx turbo with 120,000 miles on it im not asking for u people to be rude to me . Next was the safest boost to run with my manual boost controller that i got from a friend off hear from zdriver.com now with out no jokes no rude jokes and no misleading information can some one thats totaly sure give m the safest boost i can run ? im thinking 8 or 9

 

Little touchy? I think more than one person tried to give you good solid advice. Any jokes that you've read here are directed at the guy who gave the ludicrous advice. Lighten Up Francis. 99% of the people here are willing to help you. Don't look a gift horse in the mouth as they say.

Rod.

 

Wait a minute. You know this much about these cars and you can't even figure out where to get aftermarket wheels?

I think you need to chill out and get a little more experience before you start spouting off like this.

Yes, you can run 12 psi without an intercooler but it greatly increases the chance of an engine failure as a result of an incorrect air/fuel ratio.

On a an engine with 100k+ miles, you have to be more conservative.

And where the hell do you get the idea that 18psi is the most efficient boost level for a stock Datsun T3 turbo charger? Holy crap! If that were true, Garrett and Turbonetics would have a completely different product line-up.

When you can provide documentation of your setup I'll take you a little more seriously.

 

If 18PSI is good for a air research T/3 than the GT40 should be 60PSI

 

That's what I would suggest. 10 psi absolute max but to keep it safe, just set it for 8psi. The manual controller (even a good one that doesn't spike much) will probably spike to 10psi and then drop back to 8.