i know yours is ka, but i had a similar prob on my ca, and with mine i just had to get every thing tuned right, and vaccum lines in order, it still runs a little shaky but thats cause i still on stock fuel pump, but this is all on 8lbs, hope that helps any.

 

what did you have wrong that you corrected that made the most difference in bringing back the power?

 

i would check your vacuum lines. and make sure your not having any boost leaks.

If you havent done a tune up for a while... go ahead and do that.

 

What boost are you running at?
What does the gauge read (if you even have one?)

Did you lose your intercooler (seems to be missing)

Who re-flashed your ECU?

what kind Spark plugs?

 

i just replaced my cap, rotor, wires, one step colder on the ngk spark plugs, and new 300zx fuel filter etc..
The vaccume lines are bov to intake manifold, and line from lower part of wg to turbo compressor side of turbocharger! i also put my boost gauge line to the intake manifold.

dude, my car was faster before i installed the turbo kit! does backing off timing to 15 degrees make that much of a difference with turbo?

 

What is the factory timing supposed to be on the KA's
I know on my RB25 the stock timing is 15 degrees

Does the car build boost? and how much?
What are using to manage the boost? (stock WG spring?)

 

What boost are you running at?
What does the gauge read (if you even have one?)

like i said before im running 6psi!

Did you lose your intercooler (seems to be missing):

i am not using one right now, my reasoning is because the z31 turbo and 280zx turbo don't have one, and they don't have even a bov, and they run more boost, so i should be ok! but for 6psi i should be safe. i am planning on using my smic if and when i raise boost.

Who re-flashed your ECU?
i am friends with someone who does it for a living. i forgot his company name(he is legit), but he used the same timing and fuel map that jwt uses.

what kind Spark plugs? i used one step colder than stock (NGK)

 

Who re-flashed your ECU?
i am friends with someone who does it for a living. i forgot his company name(he is legit), but he used the same timing and fuel map that jwt uses.

are you sure your friend uses the same timing and fuel maps as JWT? jwt 'encrypts' there images so that no one can copy them...

 

i called my friend, who tuned my ecu, he says it was designed to work with stock timing (20 degrees) when i retarded the timing to 15 deg. he says it lowers the timing to 9 degrees when under boost. so whe i bring it back to 20 it will be 14 degrees. i'll bump up the timing tonight and go for another drive.:heyhey

 

Let us know how it goes bro !!! I hope that was the fix...

 

pulling that much timing on 6psi even without the ecu in-boost retard would make it feel a bit sluggish. i hope that's all that the issue was

 

well i brought it back to 20 deg. it is definitly faster, but i'm still not happy with the power. it only seems to have 20-30 hp more than stock.
I guess i'll get a new chip set burned with more aggressive timing and fuel trim. its a bit rich and 14 degrees seems to be so-so.... but heck! its safe and my car runs good. cept two things.... a small lean spot when you first hit the gas hard for a split second. and the other thing is it wants to die, or stumbles when i let it idle down aggressivly.

thanks for the help!

 

well i brought it back to 20 deg. it is definitly faster, but i'm still not happy with the power. it only seems to have 20-30 hp more than stock.
I guess i'll get a new chip set burned with more aggressive timing and fuel trim. its a bit rich and 14 degrees seems to be so-so.... but heck! its safe and my car runs good. cept two things.... a small lean spot when you first hit the gas hard for a split second. and the other thing is it wants to die, or stumbles when i let it idle down aggressivly.

thanks for the help!

one, you need a better tune. go to a shop and pay for a better tune. the tune you have now isn't specific for your car, it is basically a guess... and guessing isn't good enough

second, at 6 pounds of boost, all you're gonna gain is 30 ish HP.
a stock sr20 will beat you with only 6 pounds.

if you want to go fast, get an intercooler on there, bump the boost to 8-10 and get it tuned. the better the tune the better the engine will run and the more power you can make.

 

your bov is dumping into the atmosphere and your running really rich in between shifts because of it either run a blow threw maf or recirc your bov

 

uhhh if you look at the pictures, its not a blow-threw set-up.

 

i say run a fmic - install a fpr - boost gage - boost controler that should help
without a fmic all your doing is pumping hot air into the motor i would recomend one even if its a stock sr20 fmic


and have your ecu re maped

 

the ecu is getting remapped soon, i already have a turbo tune, but i wanted conservitive and thats what i got.:heyhey
the car already has a fpr stock and it works perfectly
i already have a boost guage
i know about the ic, jeeze, even with an ic its still hot air. and there is more lag with one.

 

Get a better tune and for the love of god get some form of intercooler. I hate ghetto setups.

 

im with yo on that one hawk

fmic....fmic....fmic

 

8psi

and bring timing back to tdc

370 cc on a KA should feel laggy @ 6psi with ignition timing retard

 

i had the same problem.

the car pulled sluggish. and used ALOT of gas.

 

You should be running a walbro fuel pump and you would need a better fpr for the increased flow. So get those two things. Otherwise, you are on teh right track with the new map and ic. I would not expect your car to make more than 30hp extra with no ic.

 

the biggest mistake you got is that you don't have a wideband, you need one ASAP!,also what type of gap are u running on the spark plugs?also it looks like you have a eBay turbo that could also be the problem,check on your boost gauge to see if your building any boost.

 

get an intercooler kit. With this kit, you get t-bolt clamps to join your pipes. Those radiator hose clamps you got are prone to boost leak. You went this far to turbocharge your car, you should do this right. If the tune is done right, there should be little or no lag difference with or without an intercooler.

http://cgi.ebay.com/ebaymotors/89-9...tercooler-Kit_W0QQcmdZViewItemQQcategoryZ33632QQihZ009QQitemZ190127157139QQrdZ1

ebay is your friend.

 

hey thanks for the ic link, looks very tempting. But I want more stealth. I was thinking of something i can mount that doesn't show up for the cops. i mean, black paint doesn't work when they are looking right at it!

at 1 am in the morning i was driving home with my brother. he has a 1970 chevy Nova with a rebuilt 327 ci small block with cam and 4-barrel edelbrock carb and dual 2.5" exaust. it has the tall gearing from the inline six. but with the v8 it is pretty insane what top speeds you can get. we also re-did the suspension with all urathane bushings, new springs and leafs, and adjustable shocks, swaybars, and traction bars with some 15x8 american racing sloted wheels and bf goodrichs all around. it drives strait as an arrow and handles as good as its gonna get with that aged suspension. well I ran him on the empty freeway from 55 (he got me from the start, damn automatic and v8) and we held pretty steady up untill 145mph (I did pull on him a few car lengths, but it wasn't like i flew by LOL!) when i let off.

 

uhhh if you look at his post it said either run a blow through setup or recirc your boc\v. it didnt say that he was running blow though..

anyway..get the fmic. and recirc the bov. wideband and tune. dont go back to NA. trust me you havent seen what that turbo could do. the first time i drove my ca(.4l smaller) with a t28, at 6psi, i about shat my pants. dont worry that will be a fun car. its a learning process which takes time and patience

 

Who made that turbo..?

 

looks like egay.

 

eeeck. yeah, it looks to be so...

 

You dont have to recirculate the blow off valve.

the only reason its a problem on SR's is the ECU is expecting that Air
So when ever you run a Blow off valve that air isnt there any more.

With a KA, the extra air was never there.. so i dont believe you need a recirculating.

Yes not having an intercooler will give you more response but honestly you will be limited on the power you can make... Intercooler really do help bro.

So my recomendations

Adjustable fuel pressure regulator = set Fuel pressure to what it should be
Intercooler (side mount or what ever you want)
Get the car tuned correctly
Boost controller to manage your boost.

And you should be good to go. there are some other things i still would recommend like a wide band but thats up to you