Another dead ka-t (pics) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sr20player · 11-17-2006, 08:11 PM

My freinds Ka-t decided to take a dump on him.... He was had just filled his tank with gas, as he was leaving the gas station his car started stalling and shut off. He rolled over to the vacuum and air pump at the station(he didnt get to far), opened his hood a white smoke was flooding out of his valve cover. He had thought that it was a head gasket. When I told him it sounded more like a broken ring, he decided to rebuilt it. When he finally got it all apart he started cleaning up the pistons when.... they fell apart. In all three of the four pistons broken and missing pieces. He was running a t25 of a redtop SR20 on only 7psi.

PITCH · 11-17-2006, 09:23 PM

Was the car professionally tuned? What engine management was being used?

North240 · 11-17-2006, 09:27 PM

2nd on the fuel management question.

ReLevent1 · 11-17-2006, 09:32 PM

how long did it last?

sr20player · 11-18-2006, 12:26 AM

he sent his ecu to JWT to have it tuned for SR 370cc injector , SR t25 turbo, stock MAF, and full exhaust. the ECU was tuned to run 10psi but he was only running 7psi. I dont think running a little rich could cause that.

!Zar! · 11-18-2006, 12:57 AM

Do you have any pics of the top of the pistons, and plugs?

EDacIouSX · 11-18-2006, 01:35 AM

de right? when he threw the kit on how many miles did he have on the car AND did it have good compression across the board?

WILDACEX187 · 11-18-2006, 03:22 AM

is that wat happens to a ka when its fed 7 pounds on a baby t25? ouch. what is he going to do now?

kY.gordon · 11-18-2006, 03:28 AM

+1 for the cylinder psi question

PITCH · 11-18-2006, 07:51 AM

Almost all of the KA's Ive heard that blow were not properly tuned and all seemed to be running SR injectors.

CylonFrakker · 11-18-2006, 01:54 PM

370cc injectors are not enough for 7-10 psi. You were probably at extremely lean points especially when the stock KA ecu likes to advance timing at about 3500 RPMs. Next time spend the money on a good wideband and a map ecu or go stand alone. It will cost less in the long run.

sr20player · 11-18-2006, 07:27 PM

Quote:

Originally Posted by Supraflame

370cc injectors are not enough for 7-10 psi. You were probably at extremely lean points especially when the stock KA ecu likes to advance timing at about 3500 RPMs. Next time spend the money on a good wideband and a map ecu or go stand alone. It will cost less in the long run.

how can you say 370cc are not enough? the ECU was tunned for them by JWT. the injectors came out of my sr and that runs 11psi stock. how can it be lean. it was tunned for 10 psi and he was only running 7psi. I think that would make it rich.

nosajton · 11-18-2006, 07:32 PM

stock cast KA pistons suck for turbo. you'll eventually blow a ring land because the rings are so close. one detonation off sync will blow every piston into pieces.

im surprised it lasted as long as it did. my stock KA-T lasted 6 weeks at 10psi with my personal dyno tuned eprom. was pushing about 280whp. then i blew a ring in #4 cylinder..

just rebuild the motor with forged pistons and you'll be fine. its the best 400 you'll spend and it should be able to handle anything that t25 could spin

Neejay · 11-18-2006, 08:45 PM

sr20player: What was his FULL setup? Like everyone else said, details? (Mileage, compression #'s, etc.)

undercoverdjay · 11-18-2006, 09:53 PM

My wideband 02 read 12:1 flat from Hi throttle map at 3,000RPM all the way to redline with 370's and a T25 on my KA-T. 15-16:1 off boost cruising. It'd fluctuate lean a little off boost, but, ran perfect. Definitely the motors condition before boost determines its overall reliability. My KA was bone stock internally, just was always a strong engine. To date, it's the heathliest KA I had ever driven. KA's are awesome engines, I'm almost sorry I have as much invested into my SR that I do. My daily KA-T with half the money invested would take mine, and most, SR's to cleaners.

ispypsi · 11-18-2006, 10:25 PM

12:1 is a little risky. most people will say 12:1 is ok on low boost applications, as it is the "optimal" a/f ratio to tune for in FI, but most of the time it is lower for safety reasons.

being that little hairdryer pumps out so much air, 12:1 might have been a tad on the lean side. depends what kinda timing jwt decided to throw into it and what the base timing was at in the first place.

sucks it happened. rebuild better.

sr20player · 11-18-2006, 10:35 PM

compression is unknown. the mileage was 58,xxx. the engine came out of a 96 s14. my friend only used it because low miles and it was free(from another friend who got an sr) like I said it was pretty stock. 96 KA, ssautochrome headers, dump and down pipe, full exhaust, SR injectors, SR t25(7psi) , ssauto front mount, and JWT ECU. He drives pretty easy. Ive only seen him drive it hard once. It was turbo for only 8 months and driven only a handfull of times cause he has two other daily drivers. I knew it wouldnt last that long but I figured it would have lasted longer then it did. and I would have never guess it would crap out with the light driving he does.

undercoverdjay · 11-19-2006, 12:32 PM

yeah something isnt right. Only thing I can think of is JWT didnt touch the timing or something, and it started to detonate. Thats the only thing. My timing was left stock, ECU stock, and 10psi was ran through it, and still is. Too bad, cause KA-Turbos are a proven setup if you arent a tard. Assuming it wouldnt last long is definitely not smart, unless you know your friend doesnt do things right (which sounds like he covered his bases well) KA's are tanks, your SR would be blowing oil before before a well tuned KA-T would come close to having a problem. It's all in how you treat them I guess.

orion::S14 · 11-20-2006, 12:30 PM

Well, you know it's from detonation.

The ECU was fine, I'm sure...otherwise it would have died in week 1.

If the base timing was not recently changed, then rule timing out.

...

The fact the ECU was "tuned for 10psi" and he was only running 7 means jack sh!t. MAF based engine management optimizes the fuel based on airflow.

7psi = less airflow as measured by the MAF, so less fuel.

...

SO...that leave fuel pressure, or bad gas.

If he has a Walbro, or some other upgraded pump...is it hardwired? If not, it might not have been getting enough voltage = low flow.

Bad gas...who knows.

- Brian

*NemeGuero* · 11-20-2006, 01:40 PM

that sucks..
my ka-t has been running with a SHITTY ASS tune for almost 2 years..
at 8psi...

NiSilS14 · 11-21-2006, 12:51 AM

My car was fine at 9lbs for a whole season of racing. Then I turned it up to 18lbs w/ C16. Lasted for a week or two, then boom, oops.

LB.Josh · 11-21-2006, 01:06 AM

Bull, he had to be running more than 7 psi. Ask him if he's been hitting the scrambleboost then nod slowly

turbo2nr · 03-31-2008, 08:02 PM

wow that sucks.. some one probably went to aggressive with timing and didnt give her enough fuel... ouch

well you live and learn... tear her apart throw some pistons and rods and start again..

ive been on a shitty safc tune for a yr with a stupid big turbo even spiking to 14psi and i still have 180psi across all four on a ka that has 116k on it...

timing kills ka not boost

***FaLKoN240*** · 03-31-2008, 09:32 PM

Way to fail and bump a two year old thread.

Using the search option is great and all, but try to keep your eye on the post dates.

turbo2nr · 03-31-2008, 10:08 PM

woops... sorry

p0wned

11-17-2006, 08:11 PM	#1
sr20player Join Date: Mar 2005 Location: Hawaii Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	Another dead ka-t (pics) My freinds Ka-t decided to take a dump on him.... He was had just filled his tank with gas, as he was leaving the gas station his car started stalling and shut off. He rolled over to the vacuum and air pump at the station(he didnt get to far), opened his hood a white smoke was flooding out of his valve cover. He had thought that it was a head gasket. When I told him it sounded more like a broken ring, he decided to rebuilt it. When he finally got it all apart he started cleaning up the pistons when.... they fell apart. In all three of the four pistons broken and missing pieces. He was running a t25 of a redtop SR20 on only 7psi.

11-17-2006, 09:23 PM	#2
PITCH Zilvia FREAK! Join Date: Jan 2006 Location: GA Age: 43 Posts: 1,103 Trader Rating: (5) Feedback Score: 5 reviews	Was the car professionally tuned? What engine management was being used? __________________

11-17-2006, 09:27 PM	#3
North240 Zilvia Junkie Join Date: Mar 2004 Location: Portland, MAINE Age: 42 Posts: 350 Trader Rating: (0) Feedback Score: 0 reviews	2nd on the fuel management question. __________________ ROUND 2

11-18-2006, 12:57 AM	#6
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	Do you have any pics of the top of the pistons, and plugs? __________________

11-18-2006, 03:22 AM	#8
WILDACEX187 Post Whore! Join Date: Jan 2003 Location: QUEENZ, NYC Age: 42 Posts: 3,103 Trader Rating: (4) Feedback Score: 4 reviews	is that wat happens to a ka when its fed 7 pounds on a baby t25? ouch. what is he going to do now? __________________ SR POWA COUPE LUVVV!!!

11-17-2006, 09:32 PM	#4
ReLevent1 Zilvia Junkie Join Date: Dec 2003 Location: ELk Grove/San Jose Age: 38 Posts: 343 Trader Rating: (1) Feedback Score: 1 reviews	how long did it last? __________________ Don't be such a Mc I BE HERRA JERIFTINZ

11-18-2006, 12:26 AM	#5
sr20player Join Date: Mar 2005 Location: Hawaii Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	he sent his ecu to JWT to have it tuned for SR 370cc injector , SR t25 turbo, stock MAF, and full exhaust. the ECU was tuned to run 10psi but he was only running 7psi. I dont think running a little rich could cause that.

11-18-2006, 01:35 AM	#7
EDacIouSX Post Whore! Join Date: Nov 2004 Location: Los Angeles Age: 39 Posts: 4,566 Trader Rating: (53) Rides Gallery: EDacIouSX Feedback Score: 53 reviews	de right? when he threw the kit on how many miles did he have on the car AND did it have good compression across the board?

11-18-2006, 03:28 AM	#9
kY.gordon Banned from the Marketplace Join Date: Sep 2005 Location: Bay Area SF Posts: 123 Trader Rating: (0) Feedback Score: 0 reviews	+1 for the cylinder psi question

11-18-2006, 07:51 AM	#10
PITCH Zilvia FREAK! Join Date: Jan 2006 Location: GA Age: 43 Posts: 1,103 Trader Rating: (5) Feedback Score: 5 reviews	Almost all of the KA's Ive heard that blow were not properly tuned and all seemed to be running SR injectors. __________________

11-18-2006, 01:54 PM	#11
CylonFrakker Zilvia Addict Join Date: Apr 2003 Location: Nashville TN Age: 43 Posts: 899 Trader Rating: (3) Feedback Score: 3 reviews	370cc injectors are not enough for 7-10 psi. You were probably at extremely lean points especially when the stock KA ecu likes to advance timing at about 3500 RPMs. Next time spend the money on a good wideband and a map ecu or go stand alone. It will cost less in the long run. __________________ UGR.....SOMETHING WICKED THIS WAY COMES....

11-18-2006, 07:32 PM	#13
nosajton Zilvia Junkie Join Date: Jul 2006 Location: San Diego Posts: 392 Trader Rating: (10) Feedback Score: 10 reviews	stock cast KA pistons suck for turbo. you'll eventually blow a ring land because the rings are so close. one detonation off sync will blow every piston into pieces. im surprised it lasted as long as it did. my stock KA-T lasted 6 weeks at 10psi with my personal dyno tuned eprom. was pushing about 280whp. then i blew a ring in #4 cylinder.. just rebuild the motor with forged pistons and you'll be fine. its the best 400 you'll spend and it should be able to handle anything that t25 could spin

11-18-2006, 08:45 PM	#14
Neejay Post Whore! Join Date: Jan 2004 Location: lol Age: 39 Posts: 2,586 Trader Rating: (2) Rides Gallery: Neejay Feedback Score: 2 reviews	sr20player: What was his FULL setup? Like everyone else said, details? (Mileage, compression #'s, etc.)

11-18-2006, 09:53 PM	#15
undercoverdjay Zilvia Junkie Join Date: Apr 2004 Location: Potsdam New York Age: 41 Posts: 594 Trader Rating: (2) Feedback Score: 2 reviews	My wideband 02 read 12:1 flat from Hi throttle map at 3,000RPM all the way to redline with 370's and a T25 on my KA-T. 15-16:1 off boost cruising. It'd fluctuate lean a little off boost, but, ran perfect. Definitely the motors condition before boost determines its overall reliability. My KA was bone stock internally, just was always a strong engine. To date, it's the heathliest KA I had ever driven. KA's are awesome engines, I'm almost sorry I have as much invested into my SR that I do. My daily KA-T with half the money invested would take mine, and most, SR's to cleaners.

11-18-2006, 10:25 PM	#16
ispypsi Leaky Injector Join Date: Jul 2005 Location: FL Age: 42 Posts: 97 Trader Rating: (0) Feedback Score: 0 reviews	12:1 is a little risky. most people will say 12:1 is ok on low boost applications, as it is the "optimal" a/f ratio to tune for in FI, but most of the time it is lower for safety reasons. being that little hairdryer pumps out so much air, 12:1 might have been a tad on the lean side. depends what kinda timing jwt decided to throw into it and what the base timing was at in the first place. sucks it happened. rebuild better. __________________ 97 240sx ka-t. 12.8 @ 108mph. for sale $8K in Florida. 08 mazdaspeed 3. faster + quieter = sleeper.

11-18-2006, 10:35 PM	#17
sr20player Join Date: Mar 2005 Location: Hawaii Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	compression is unknown. the mileage was 58,xxx. the engine came out of a 96 s14. my friend only used it because low miles and it was free(from another friend who got an sr) like I said it was pretty stock. 96 KA, ssautochrome headers, dump and down pipe, full exhaust, SR injectors, SR t25(7psi) , ssauto front mount, and JWT ECU. He drives pretty easy. Ive only seen him drive it hard once. It was turbo for only 8 months and driven only a handfull of times cause he has two other daily drivers. I knew it wouldnt last that long but I figured it would have lasted longer then it did. and I would have never guess it would crap out with the light driving he does.

11-19-2006, 12:32 PM	#18
undercoverdjay Zilvia Junkie Join Date: Apr 2004 Location: Potsdam New York Age: 41 Posts: 594 Trader Rating: (2) Feedback Score: 2 reviews	yeah something isnt right. Only thing I can think of is JWT didnt touch the timing or something, and it started to detonate. Thats the only thing. My timing was left stock, ECU stock, and 10psi was ran through it, and still is. Too bad, cause KA-Turbos are a proven setup if you arent a tard. Assuming it wouldnt last long is definitely not smart, unless you know your friend doesnt do things right (which sounds like he covered his bases well) KA's are tanks, your SR would be blowing oil before before a well tuned KA-T would come close to having a problem. It's all in how you treat them I guess.

11-20-2006, 12:30 PM	#19
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,666 Trader Rating: (0) Feedback Score: 0 reviews	Well, you know it's from detonation. The ECU was fine, I'm sure...otherwise it would have died in week 1. If the base timing was not recently changed, then rule timing out. ... The fact the ECU was "tuned for 10psi" and he was only running 7 means jack sh!t. MAF based engine management optimizes the fuel based on airflow. 7psi = less airflow as measured by the MAF, so less fuel. ... SO...that leave fuel pressure, or bad gas. If he has a Walbro, or some other upgraded pump...is it hardwired? If not, it might not have been getting enough voltage = low flow. Bad gas...who knows. - Brian __________________ www.KA24DEvelopment.com

11-20-2006, 01:40 PM	#20
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 40 Posts: 8,132 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	that sucks.. my ka-t has been running with a SHITTY ASS tune for almost 2 years.. at 8psi... __________________

11-21-2006, 12:51 AM	#21
NiSilS14 Zilvia Junkie Join Date: Sep 2003 Location: Denver, CO Posts: 569 Trader Rating: (20) Feedback Score: 20 reviews	My car was fine at 9lbs for a whole season of racing. Then I turned it up to 18lbs w/ C16. Lasted for a week or two, then boom, oops.

11-21-2006, 01:06 AM	#22
LB.Josh Join Date: Oct 2006 Location: So Cal Age: 40 Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	Bull, he had to be running more than 7 psi. Ask him if he's been hitting the scrambleboost then nod slowly __________________ Limit Break!'s Biker -Josh

03-31-2008, 08:02 PM	#23
turbo2nr Post Whore! Join Date: Jan 2005 Location: queens NYC Age: 39 Posts: 2,561 Trader Rating: (8) Feedback Score: 8 reviews	wow that sucks.. some one probably went to aggressive with timing and didnt give her enough fuel... ouch well you live and learn... tear her apart throw some pistons and rods and start again.. ive been on a shitty safc tune for a yr with a stupid big turbo even spiking to 14psi and i still have 180psi across all four on a ka that has 116k on it... timing kills ka not boost __________________ s14 kouki ka-t

03-31-2008, 09:32 PM	#24
*FaLKoN240* Super Moderator Join Date: Jun 2004 Location: SoCal Temecula Posts: 16,893 Trader Rating: (73) Feedback Score: 73 reviews	Way to fail and bump a two year old thread. Using the search option is great and all, but try to keep your eye on the post dates. __________________ Best way to do business with me? Make your best offer FIRST.

03-31-2008, 10:08 PM	#25
turbo2nr Post Whore! Join Date: Jan 2005 Location: queens NYC Age: 39 Posts: 2,561 Trader Rating: (8) Feedback Score: 8 reviews	woops... sorry p0wned __________________ s14 kouki ka-t