The KA Turbo Thread - Page 2 - Nissan Forum
General 240SX/Silvia/S12 200SX For general 240SX/Silvia/S12 200SX discussion

Closed Thread
 
LinkBack Thread Tools Display Modes
post #16 of 27 Old Aug 22nd, 2005, 08:58 PM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
On that note, optimal timing is said to be 18 degrees BTDC on KA24DE engines for turbocharged setups. You need to retard the spark at least 3 degrees to fight knock, but 5 degrees is best. SAFC-II comes with a knock sensor voltage reading, and you can program a threshold into it so that an alarm sounds when the engine has too much knock. It's a nice feature, but some people have had trouble with their knock sensors. The MSD timing regulator is best. Greddy EManage allows you to screw with timing as well.


StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.

Last edited by bridrive55; Aug 22nd, 2005 at 09:00 PM.
bridrive55 is offline  
Sponsored Links
Advertisement
 
post #17 of 27 Old Aug 29th, 2005, 06:04 PM
Nissan Enthusiast
 
Joined: Sep 2003
Location: Hillsboro, OR
Posts: 149
Autometer narrowband guages will tell you very little about what your motor really is doing. You will need a wideband 02 sensor setup to be able to monitor it. You should have one on any motor frankly. Even a NA motor could benefit from it.
thedaddies is offline  
post #18 of 27 Old Aug 30th, 2005, 10:51 AM
Nissan Enthusiast
 
Joined: Aug 2005
Location: Oregon
Posts: 129
Send a message via AIM to veilside180sx Send a message via Yahoo to veilside180sx
Stay as far out of boost as possible. I have to do the same thing to get to my dyno as well. Just make it rich around 4000 to cover your butt. Don't get out of the partial throttle maps on the ecu. That way you really won't be building much boost, if any.

What trim and a/r did you buy for the XS turbo?
veilside180sx is offline  
Sponsored Links
Advertisement
 
post #19 of 27 Old Aug 30th, 2005, 11:32 AM
Nissan Enthusiast
 
chrislis's Avatar
 
Joined: Jun 2005
Posts: 152
I'm only gonna be running about 8-10 pounds of boost, I was told I'll be fine if I drive at about 3-4 grand on the rpms the whole way. I'll pretty much stay 65 mph the whole way up. Now another question, what about the MAF sensor? I heard it will be going nuts not recognizing anything going on.
chrislis is offline  
post #20 of 27 Old Nov 2nd, 2005, 01:26 PM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
Quote:
Originally Posted by chrislis
I'm only gonna be running about 8-10 pounds of boost, I was told I'll be fine if I drive at about 3-4 grand on the rpms the whole way. I'll pretty much stay 65 mph the whole way up. Now another question, what about the MAF sensor? I heard it will be going nuts not recognizing anything going on.
MAF sensor choice usually goes with management choice. SAFC-II likes the Nissan MAFS. A GTR MAF will handle huge ammounts of airflow (>60lb∑min^-1), and the Z32 MAF fits nicely on 3" piping while still being able to process lots of airflow.

StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.
bridrive55 is offline  
post #21 of 27 Old Nov 30th, 2005, 03:06 PM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
Quote:
Originally Posted by bridrive55
MAF sensor choice usually goes with management choice. SAFC-II likes the Nissan MAFS. A GTR MAF will handle huge ammounts of airflow (>60lb∑min^-1), and the Z32 MAF fits nicely on 3" piping while still being able to process lots of airflow.
To clarify notation, lb∑min^-1 reads "pounds per minute."

StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.
bridrive55 is offline  
post #22 of 27 Old Dec 8th, 2005, 09:42 AM
Metal > Rap
 
Nismo14-180's Avatar
 
Joined: Mar 2004
Location: Murfreesboro/Nashville TN
Posts: 668
Send a message via AIM to Nismo14-180 Send a message via Yahoo to Nismo14-180
What about downpipe selection? like using a SR downpipe (performance or stock) for a stock T25/T28, would it even fit up to the catalyst converter?

Maybe I should have asked this on KA-T.org...

1991 RMS13-- DD; Slushbox, bad paint, and dents
1992 CS13-- Getting overhauled for WMD status.
Nismo14-180 is offline  
post #23 of 27 Old Dec 9th, 2005, 03:54 PM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
Quote:
Originally Posted by Nismo14-180
What about downpipe selection? like using a SR downpipe (performance or stock) for a stock T25/T28, would it even fit up to the catalyst converter?

Maybe I should have asked this on KA-T.org...
The stock SR downpipe works on Nissan T2s. It's easiest to get high flow stuff from step one, however. Custom downpipes are manufactured that go past just the "elbow" and bolt up to factory S13 or S14 exhaust loci. EBay it.

StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.
bridrive55 is offline  
post #24 of 27 Old Dec 10th, 2005, 06:42 PM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
PICTARS!

Hey guys,
I figured all this talk deserved at least a little pic-action. So last summer I spent all my time and money on my project, but I quickly ran dry, and I was going from paycheck to paycheck, putting every penny in my car. I didn't get anywhere near where I wanted to get, and I didn't work out all the kinks, but here's where I was at:

VLSD swap complete: 1995 Infiniti J30
Race clutch
3" dummy exhaust, welded by buddy... Soon to be redone professionally
T04E
Tial 38mm WG
3" FMIC piping
Type S BOV
Big FMIC (never measured it)
550cc galley injectors
Z32 fuel pump
SAFC-II
Q45 MAF (actually an RB26DETT)
Lots of etc.

So it's not anywhere near done, but here's how it looked when we fired it up to run SAFC-II numbers:


From the front: a modified S13A front end that I had laying around. I know it looks stupid, I just wanted to show how sneaky the FMIC is:


This is the engine when I was redoing the spark system, no exhaust or FMIC piping attached:


So it's nothing special, but when it's done it should be nice. I don't aim for more than 325whp, because it's scary. There's a 2" spring drop as well, and shaved everything. Stock rims and such. I plan to paint it this summer, and get a real exhaust. We did actually port the WG into the exhaust to make it nice and quiet, because I like the whooooosh noise. I ran it at 15psi for a little while, but 7-10 are what it's usually at.
The main point of this project was the engine swap. The turbo kit just kind of fell into place. I really just wanted to wire in an S14 motor because my KA24E spun a bearing.

StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.
bridrive55 is offline  
post #25 of 27 Old Apr 23rd, 2006, 12:49 AM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
Looked up the MAF codes and it is actually from a VH45, not a GTR at all. Stupid importers don't really know where their parts come from. Anyways, just wanted to set that straight.

StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.
bridrive55 is offline  
post #26 of 27 Old Jul 13th, 2006, 03:15 PM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
DANGER: KA leanout!

Hey guys,
Considerable evidence points to the conclusion that the stock KA24DE OBDI (and KA24E) oxygens sensor band is exceeded by the fuel/air ratios generated when a turbocharger generates atmospheric pressure (manifold neutral pressure, reads 0psi on a vacuum gauge). This preboost spool occurs during regular driving every time the throttle plate is not fully open and manifold (post throttle body) pressure is between 4"Hg and 3-4psi boost. The factory ECU map cannot compensate for the increased air, and unilinear A/F curve adjustments will not compensate for this! Preboost leanout will hurt your KA, so I strongly advise all turbocharged KA's to take extra care in enriching the fuel/air mixture in that pressure range. I recommend usining wideband oxygen sensing and an earlier fuel pressure onset if possible.

The OBD-II oxygen sensors have a wider band (wider voltage range), and this might compensate for preboost leanout. Once again, this is only a consideration on turbocharged vehicles.

StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.
bridrive55 is offline  
post #27 of 27 Old Aug 1st, 2006, 09:24 PM Thread Starter
KA24DET
 
bridrive55's Avatar
 
Joined: Aug 2004
Location: UW Madison
Posts: 1,000
Send a message via AIM to bridrive55
Oil restriction

Oil starvation and bearing oil seal hyperpressurization are two leading causes of premature turbo failure, when douchebaggery and idiocy are not considered causes of failure. Ensuring the right pressure for your turbo by variable resistance would be the most reliable method of controlling bearing lubrication, but it would be difficult to monitor the pressure adequately right before the oil inlet on the turbo. I've kicked around the idea of a rising-rate resistor linked to a vacuum line (boost line) that would open a valve under boost and permit more oil flow to the turbocharger, but my first design using a modified fuel-pressure regulator failed. The best way remains unilinear resistance of a large aftermarket oil line.
This unilinear (constant, as opposed to variable) resistance is usually achieved by placing a NOS jet in the oil feed line right before the inlet to the turbo. Other down-and-dirty methods include the tapered head of a BIC ball-point pen and the actual piece that I use, which is a selectively cut plastic tip from a micropipet, a device used by molecular biologists (such as myself) to accurately aspirate and deliver small quanitities of liquids. This is a polystyrene cone that I cut at two sections to create a tubule that supplies the peripheral resistance needed to save the turbo bearing seal from hyperpressurization. I recommend the NOS jet route. Do NOT run a turbocharger (especially a T2) without oil resistance of some sort.
Oil starvation can be prevented by monitoring oil lines carefully. If an oil line becomes kinked, the turbo seal will dry out and the bearing will blow. This destroys the turbocharger. Too many good people have sold their cars after the frustration of blowing multiple snails.

StreetTech S13
KA24DET, .70A/R T04E, FMIC, VLSD, SAFC-II, 550cc's, Q45 MAF.
bridrive55 is offline  
Closed Thread

  Nissan Forum > 240SX/Silvia/S12 200SX > General 240SX/Silvia/S12 200SX

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Nissan Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
!!! KA24DET vs. SR20DET !!! MontyCrabApple SR20DE/DET Engines 242 Sep 6th, 2006 07:38 PM
Turbocharger: How does it really work....? asleepz Forced Induction & Nitrous Oxide 102 Jan 10th, 2005 12:25 PM
Nizmodores RB Swap Thread! Nizmodore General 240SX/Silvia/S12 200SX 3 Apr 29th, 2004 08:10 AM
Changing out Turbo asleepz Z31 300ZX(T) 23 Mar 17th, 2004 11:32 AM
Skyline - N/A or Turbo, Heavy or Light? Lurker Above Nissan GTR/Skyline 5 May 17th, 2003 04:49 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome