Ka24et turbo gods help! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

shift_haystack · 01-25-2009, 05:36 PM

hey this is my FIRST TURBO build. its a very mild build but i came into some trouble.to make things short and cut to the point i need some help to finish my ka24et. sohc. im in the end process of it and just need help tuning etc. my hp goals are 200-250.

mods are.
t3/t4 turbo
external wastegate
log manifold
2.5 downpipe
stock ecu,injectors,maf
2.5 intercooler piping
12:1 FMU
Walbro 255lph fuel pump
greddy type blov
ebay fmic
egr removed.(not all emissions removed b/c i live in cali)
ngk spark plugs
stanza electric fans

now i need to change my base timing a few degrees. and find out why when i press the brake pedal my engine sounds starved. i have the boost gauge and bov in the brake booster vac line.i idle about 750rpms and my boost gauge reads 20hg.when i press down the pedal it spongy and goes all the way down. it sounds like my engine is about to die and sometimes it does when not warmed up. i also want to know what is the procedure to change base timing on a sohc. i've search and no results. im not experience in tuning and would like to know if anyone can help me out. anyone here local enough with good turbo knowledge please help me out. any other comments on build if constructive is nice too. thanks all. excuse the ugly phone pics.

*hOngsterr* · 01-25-2009, 06:37 PM

i want to ka-t lol

J90lude · 01-25-2009, 08:14 PM

Running on stock injectors WTF!! I think its time to upgrade on that buddy

projectRDM · 01-25-2009, 08:44 PM

Agreed. Upgrade the injectors please, you'll run out of fuel way before you can really hit boost.

As far as the engine stalling, you should NOT be pulling vacuum from the brake booster line. There's a check valve in it that won't allow bypass air to travel back through to the intake.

Use one of the spare ports from the EGR to tap vacuum signal, you want it as close to the throttle body or after (but not on the booster). There's a couple small ports for the charcoal canister too that will work fine.

ChicagoS14 · 01-25-2009, 08:54 PM

Also your blow off valve is not recirculated, therefore because KA motors run off a MAF ( Mass Air Flow Sensor ) all air that enters the intake system is metered. When you do not recirculate the blow off valve the air that gets released when you let your foot of the pedal causes the car to stall and or hesitate because the ECU thinks the car got a certain amount of air, when in fact it got less. Unless you compensate for the lost air due to the blow off valve you will have constant stalling and hesitation issues. An SAFC can compensate somewhat for such a loss using decel settings, however no tune will be able to fully tune it out and as a result you will always have slight issues in such a system.

For further help with tuning and setup I recommend checking out: www.ka-t.org as they have extensive experience and lots of users running similar setups.

undesiredshoe · 01-26-2009, 02:20 AM

Screw the FMU, buy my chipped stanza ecu and do it right son. Im running a chipped stanza ecu in my car and im currently running 9 psi off a t3/t4 and im pretty sure its around 230-240hp....buy it....NOW! Also I have some direct drop-in rx7 460cc injectors that im willing to sell to prevent you from blowing your sweet engine.

Dman II-40 · 01-26-2009, 02:43 AM

Running a FMU and stock injectors works just fine. Just retard the base timing and you will be fine. Max boost should only be 7-8 psi though, but that should be plenty to reach your goals.

shift_haystack · 01-26-2009, 09:39 AM

heres a video of my problem. bov recirculated. and i searched on ka-t.org and they say its fine to get vacuum from my brake booster.

240tuned91 · 01-26-2009, 09:53 AM

take the bov and boost gauge off the brake booster vaccum line and see if that works. that seems like the first thing you should do.

projectRDM · 01-26-2009, 11:57 AM

Quote:

Originally Posted by shift_haystack

heres a video of my problem. bov recirculated. and i searched on ka-t.org and they say its fine to get vacuum from my brake booster.

No matter what someone else said, it's apparent the brake booster source is your problem if it's stalling when you brake. Think about it logically.

dynamicck · 01-26-2009, 04:09 PM

stock injectors with FMU = ticking time bomb.

that FMU will push 12 psi of fuel pressure for every pound of boost.
If you think of it mathematically...less than a Bar of boost, you can be "trying" to push over 100 psi.
There is psi from the OE Fuel pressure regulator as well. I would say like 6 or 7 psi would easily be over 100 psi.

*tick tick tick tick tick

s13ka24e-t · 01-26-2009, 07:58 PM

You need injectors for sure as well as a tune. I'm running deastchwerks 440cc injectos with an safc neo. Not saying to get a safc (I have someone elite on safcs) but you need some kind of tune.

Dman II-40 · 01-26-2009, 08:55 PM

He doesn't need injectors or a tune lol. Running FMU and stock injectors is plenty safe and good for a first project. There isn't room for expansion, but it will run fine.

Don't listen to them. But I would agree with the others about your vacuum source. Trying to switch it to a different spot can't hurt.

01-25-2009, 05:36 PM	#1
shift_haystack Join Date: Jan 2009 Location: hayward Posts: 36 Trader Rating: (0) Feedback Score: 0 reviews	Ka24et turbo gods help! hey this is my FIRST TURBO build. its a very mild build but i came into some trouble.to make things short and cut to the point i need some help to finish my ka24et. sohc. im in the end process of it and just need help tuning etc. my hp goals are 200-250. mods are. t3/t4 turbo external wastegate log manifold 2.5 downpipe stock ecu,injectors,maf 2.5 intercooler piping 12:1 FMU Walbro 255lph fuel pump greddy type blov ebay fmic egr removed.(not all emissions removed b/c i live in cali) ngk spark plugs stanza electric fans now i need to change my base timing a few degrees. and find out why when i press the brake pedal my engine sounds starved. i have the boost gauge and bov in the brake booster vac line.i idle about 750rpms and my boost gauge reads 20hg.when i press down the pedal it spongy and goes all the way down. it sounds like my engine is about to die and sometimes it does when not warmed up. i also want to know what is the procedure to change base timing on a sohc. i've search and no results. im not experience in tuning and would like to know if anyone can help me out. anyone here local enough with good turbo knowledge please help me out. any other comments on build if constructive is nice too. thanks all. excuse the ugly phone pics.

01-25-2009, 08:14 PM	#3
J90lude Zilvia Junkie Join Date: May 2008 Location: MD-VA/DC area Age: 34 Posts: 383 Trader Rating: (0) Feedback Score: 0 reviews	Running on stock injectors WTF!! I think its time to upgrade on that buddy __________________ "Drive it like you running from the cops"

01-25-2009, 08:44 PM	#4
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Agreed. Upgrade the injectors please, you'll run out of fuel way before you can really hit boost. As far as the engine stalling, you should NOT be pulling vacuum from the brake booster line. There's a check valve in it that won't allow bypass air to travel back through to the intake. Use one of the spare ports from the EGR to tap vacuum signal, you want it as close to the throttle body or after (but not on the booster). There's a couple small ports for the charcoal canister too that will work fine. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

01-25-2009, 08:54 PM	#5
ChicagoS14 Zilvia Addict Join Date: Aug 2004 Location: Chicago Age: 34 Posts: 695 Trader Rating: (6) Feedback Score: 6 reviews	Also your blow off valve is not recirculated, therefore because KA motors run off a MAF ( Mass Air Flow Sensor ) all air that enters the intake system is metered. When you do not recirculate the blow off valve the air that gets released when you let your foot of the pedal causes the car to stall and or hesitate because the ECU thinks the car got a certain amount of air, when in fact it got less. Unless you compensate for the lost air due to the blow off valve you will have constant stalling and hesitation issues. An SAFC can compensate somewhat for such a loss using decel settings, however no tune will be able to fully tune it out and as a result you will always have slight issues in such a system. For further help with tuning and setup I recommend checking out: www.ka-t.org as they have extensive experience and lots of users running similar setups. __________________ 95 240SX 1JZGTE \| SC300 2JZGE daily www.240sxguide.com

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01-25-2009, 06:37 PM	#2
hOngsterr Bandwagon. Join Date: Nov 2008 Location: OC (714) Posts: 4,751 Trader Rating: (73) Feedback Score: 73 reviews	i want to ka-t lol

01-26-2009, 02:20 AM	#6
undesiredshoe Zilvia Addict Join Date: Sep 2005 Location: Wisco Age: 32 Posts: 787 Trader Rating: (2) Feedback Score: 2 reviews	Screw the FMU, buy my chipped stanza ecu and do it right son. Im running a chipped stanza ecu in my car and im currently running 9 psi off a t3/t4 and im pretty sure its around 230-240hp....buy it....NOW! Also I have some direct drop-in rx7 460cc injectors that im willing to sell to prevent you from blowing your sweet engine.

01-26-2009, 02:43 AM	#7
Dman II-40 Leaky Injector Join Date: Jan 2007 Location: Bend, OR Posts: 140 Trader Rating: (6) Feedback Score: 6 reviews	Running a FMU and stock injectors works just fine. Just retard the base timing and you will be fine. Max boost should only be 7-8 psi though, but that should be plenty to reach your goals.

01-26-2009, 09:39 AM	#8
shift_haystack Join Date: Jan 2009 Location: hayward Posts: 36 Trader Rating: (0) Feedback Score: 0 reviews	heres a video of my problem. bov recirculated. and i searched on ka-t.org and they say its fine to get vacuum from my brake booster.

01-26-2009, 09:53 AM	#9
240tuned91 Zilvia Member Join Date: Jan 2009 Location: nj Age: 30 Posts: 219 Trader Rating: (3) Feedback Score: 3 reviews	take the bov and boost gauge off the brake booster vaccum line and see if that works. that seems like the first thing you should do.

01-26-2009, 04:09 PM	#11
dynamicck Zilvia Junkie Join Date: Oct 2007 Location: HB Posts: 406 Trader Rating: (4) Feedback Score: 4 reviews	stock injectors with FMU = ticking time bomb. that FMU will push 12 psi of fuel pressure for every pound of boost. If you think of it mathematically...less than a Bar of boost, you can be "trying" to push over 100 psi. There is psi from the OE Fuel pressure regulator as well. I would say like 6 or 7 psi would easily be over 100 psi. *tick tick tick tick tick

01-26-2009, 07:58 PM	#12
s13ka24e-t Join Date: Jan 2009 Location: Portland Oregon Age: 39 Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	You need injectors for sure as well as a tune. I'm running deastchwerks 440cc injectos with an safc neo. Not saying to get a safc (I have someone elite on safcs) but you need some kind of tune.

01-26-2009, 08:55 PM	#13
Dman II-40 Leaky Injector Join Date: Jan 2007 Location: Bend, OR Posts: 140 Trader Rating: (6) Feedback Score: 6 reviews	He doesn't need injectors or a tune lol. Running FMU and stock injectors is plenty safe and good for a first project. There isn't room for expansion, but it will run fine. Don't listen to them. But I would agree with the others about your vacuum source. Trying to switch it to a different spot can't hurt.