Nissan 240SX Forums banner
Cancel
Create thread New Garage Forums

S13 KA24DET Build - The PussyKAT -

Jump to Latest
341 - 360 of 435 Posts
Discussion starter · #341 ·
Alright so just letting the car idle for a bit to break in the turbo as we speak... Everything seems to be fine at the moment. No oil leaks or anything. And Btw, swapping to a t28 is not as easy as it seems lol...

Anyway, ill keep you guys posted and let you know how it feels after I drive it.
Next up is doing the q45 brake swap and getting AC put back in. Found a cusco cage for cheap too, so i might put that in as well...
 
#344 ·
nice man. good to see vaness is up and running and that t28 turbo upgrade is freekin sweet! hope u fix that pesky fuel cutting problem. wish i could help ya out there. get a vid up soon!!!
 
Save
Reply Quote Like Like
Discussion starter · #347 ·
Alright guys, I know its been forever. God 2 and a half months already... I just had to deal with some pretty lame shit. Plus school started and I have been really busy with that.

So ill just all put it into a short story.
I got the gt2871r in and it would not go into boost. I couldn't figure out why and was in the midst of figuring it out when there was an engine fire.
I was able to put it out in time so that it did not cause irreparable damage but it did enough to really set me back. I was very discouraged and didnt really want to touch the car for a while.
So I let it be while I collected my senses again.
In the end, the fire could have been a lot worse.

I replaced the wiring harness, the brake master cylinder, spark plug wires, and then got all new oil lines for the turbo. Everything else made it through ok in the engine bay. Unfortunately though, the fire bubbled the paint on the hood right above the turbo. Hood is salvageable, but its gonna need to be repainted, or at least a good portion of it. I can put pics up later.

I have had it running for about a month now, and all things considered it is going pretty well. There is a leak (serious one) from the front timing cover that i tried to use jb weld to fix, but it appears that i am just gonna need to buy a whole new cover. Guess i could use a new oil pump anyway. And the lovely cutting out problem that occurs at higher rpm's is still here :( :(

But there have been moments when i feel i have actually got to experience what this car was built for and why I put so much money into it. Ex: 4th gear pull on the freeway at 17psi = lovely :) That was as high as i turned up the boost cause it was cutting out pretty bad. Got the afr's at about a steady 12:1 at WOT and feels much better then what jim wolf had it tuned for. Just a matter of turning down fuel pressure.
Had it at 5psi for a while and it never cut out once but it just felt too slow. At the moment its at 10-11 and feels pretty good. Cuts out occasionally in 2nd gear but 3rd through 5th dont.

So thats where im at now. I am going to make a very comprehensive thread about this cutting out issue on the s13 section to see if i could get some help. If only i could get it fixed then i would finally be able to truly enjoy all this hard work I have put in...
 
#350 ·
hang in there bro. you'll get it figured out. plus, im probably going to be turning to you when i start having issues when i turbo my car lol. good to know its on the road, and im glad the fire wasnt bad, but still sucks that it happened. hang in there bro
 
#351 ·
:scratch: Isn't the OP a chick? Vanessa = girls name boys.

s13Vanessa said:
Alright guys, I know its been forever. God 2 and a half months already... I just had to deal with some pretty lame shit. Plus school started and I have been really busy with that.

So ill just all put it into a short story.
I got the gt2871r in and it would not go into boost. I couldn't figure out why and was in the midst of figuring it out when there was an engine fire.
I was able to put it out in time so that it did not cause irreparable damage but it did enough to really set me back. I was very discouraged and didnt really want to touch the car for a while.
So I let it be while I collected my senses again.
In the end, the fire could have been a lot worse.

I replaced the wiring harness, the brake master cylinder, spark plug wires, and then got all new oil lines for the turbo. Everything else made it through ok in the engine bay. Unfortunately though, the fire bubbled the paint on the hood right above the turbo. Hood is salvageable, but its gonna need to be repainted, or at least a good portion of it. I can put pics up later.

I have had it running for about a month now, and all things considered it is going pretty well. There is a leak (serious one) from the front timing cover that i tried to use jb weld to fix, but it appears that i am just gonna need to buy a whole new cover. Guess i could use a new oil pump anyway. And the lovely cutting out problem that occurs at higher rpm's is still here :( :(

But there have been moments when i feel i have actually got to experience what this car was built for and why I put so much money into it. Ex: 4th gear pull on the freeway at 17psi = lovely :) That was as high as i turned up the boost cause it was cutting out pretty bad. Got the afr's at about a steady 12:1 at WOT and feels much better then what jim wolf had it tuned for. Just a matter of turning down fuel pressure.
Had it at 5psi for a while and it never cut out once but it just felt too slow. At the moment its at 10-11 and feels pretty good. Cuts out occasionally in 2nd gear but 3rd through 5th dont.

So thats where im at now. I am going to make a very comprehensive thread about this cutting out issue on the s13 section to see if i could get some help. If only i could get it fixed then i would finally be able to truly enjoy all this hard work I have put in...
Click to expand...
The brake up / cutting out problems at high boost / RPM sound like an ignition issue. (spark blow out?) Was it an issue before the fire? What plug wires are you running now? What about before the fire? What heat range plugs are you running? Who makes them?

Air fuel could be another issue, but doubtful that its the cause of the car breaking up at high rpm/boost, I'd try throwing a bit more fuel at it. You'll make good power at 12-1, but 10.5-11.5 is a decidedly safer target.


Glad to see you're sticking with it. I didn't stick with my turbo project... sometimes I wish I had. Good luck sorting out the remaining issues. - By the way, was the cause of the engine fire ever determined?
 
Discussion starter · #353 ·
Sleepy_Steve said:
:scratch: Isn't the OP a chick? Vanessa = girls name boys.



The brake up / cutting out problems at high boost / RPM sound like an ignition issue. (spark blow out?) Was it an issue before the fire? What plug wires are you running now? What about before the fire? What heat range plugs are you running? Who makes them?

Air fuel could be another issue, but doubtful that its the cause of the car breaking up at high rpm/boost, I'd try throwing a bit more fuel at it. You'll make good power at 12-1, but 10.5-11.5 is a decidedly safer target.


Glad to see you're sticking with it. I didn't stick with my turbo project... sometimes I wish I had. Good luck sorting out the remaining issues. - By the way, was the cause of the engine fire ever determined?
Click to expand...
Thanks for your input Steve! Ignition was one of the first things I have tried to tackle with this problem. I am using NGK Iridium in the coldest (7) range. Have replaced them before to try and fix the problem. I started out with them gapped at .035 and moved them progressively down till .020. Because of the erratic nature of the problem, it seemed sometimes like it might have helped or changed the issue, but it still remained regardless of the gap.

As far as the fuel issue... With Jim Wolf tune set at factory fuel pressure a was at about 10.9 afr WOT. I turned down the fuel pressure a bit and was at about 11.4 afr after that. Problem persisted. I then turned down the pressure more to where its at now around 12 afr. Honestly it almost seems like the problem is lessened with less fuel. But it is hard to definitively say this.

So last night i was using the car for work and was doing some experimenting with the problem. And then all of a sudden it seemed like the problem went away:scratch:
I did a 2nd gear pull and it went all the way to redline without cutting out.... Shifted through 3rd and continued to pull. Did this several times over the rest of the night and did not experience a cutting out issue. So now im really confused. I mean im glad that it seems like things are getting better, but I want to know why. And for all I know it could come back again at a random time. Im gonna drive it today at work again and see if i can figure anything else out.:gaah:
 
Discussion starter · #358 ·
Damn! I can't believe that another 3 months have gone by since I've been on here.... I just got really busy with school and being that I live in Montana, the weather hasn't exactly been the greatest for driving on and working with rear wheel drive cars. Been snowy and icy pretty much non stop...

So I haven't been doing much concerned with car stuff. But I got a bunch of money from school plus tax returns :) So I figured it was time to battle some of the issues I have been working with for a while...

I guess its time to just bite the bullet and get the car on the dyno and tuned in real time. So I'm planning on taking a trip over to Seattle and taking Vanessa to UP Garage there. I have talked to Doug a lot and feel like its a good place to invest money.

Still battling the dreaded issue with the cutting out...

Here are my thoughts on that:

When I'm doing a hard pull and the car cuts out, you can watch all the boost drop off on the gauge immediately. If the window is open and you listen carefully, at the moment the boost drops off, you can hear a small short wooshing sound that I believe can only be the wastegate opening.

So I started to think about it... If all the boost is dropping off very quickly like that and the wastegate is opening, it has to be a pretty simple explanation right? The actuator controls the wastegate, and the actuator is controlled by a single vacuum source. The actuator I am using is an HKS adjustable, so i didnt figure it would be the problem...

So I put a different actuator in. No Difference.

This brings me to where I am right now. Im thinking that it has to do with the vacuum source going to the actuator. Here is a pic of my current setup:

Image


Now I know this seems sort of half assed and jerry-rigged, but I was told to do it by a shop I trust, and it worked fine before I rebuilt my engine....

The pink hose towards the bottom of the pic is the hose the goes to the actuator. It is JB Welded into the hot pipe with a plastic nipple where a hole was cut. I didn't really know of another solution because there is no nipple on the turbo itself to provide the vacuum signal. I have since shortened the pink hose...

So I am asking you guys if you could think of a problem with this setup or provide a better solution. I am going to try a different hose and get rid of the pink one cause its pretty old. Also, there is a bunch of JB Weld holding that nipple in, so i'm pretty confident that there is no leak there.

Just trying to narrow things down here. Thanks for your input everyone!

Oh and I sold the S14 a long time ago. Needed money and I didnt really have the time to deal with it.
 
#360 ·
I'm tending to think it's not a vacuum line/actuator problem and that it might be something a little more sinister like something is causing your injectors to cut out, or something is causing fuel to stop being supplied. When you hit a fuel cut at full boost, your boost will vanish as quickly as if you just let off the gas. Could you be hitting a fuel cut? Could you be maxing your injectors? Your AFRs appear ok now? I believe I've had some stumble on AFR's in the 10's on gas. But, at 11 or above you shouldn't be cutting out.

Just a couple of quick thoughts.
 
341 - 360 of 435 Posts
About this Discussion
434 Replies
46 Participants
Last post:
s13Vanessa
Nissan 240SX Forums
posts
1.6M
members
94K
Since
2002
A forum community dedicated to Nissan 240SX owners and enthusiasts. Come join the discussion about performance, builds, engine swaps, turbos, modifications, classifieds, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
S13 240SX (89-94) New Member Introductions General Tech S14 240SX (95-98) KA24DE & KA24E