Needing info for KA24E-T - Nissan 240SX Forums
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post #1 of 7 Old 07-23-2017, 07:23 AM Thread Starter
 
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Needing info for KA24E-T

So about 2 months ago I picked up a 1988 S13 with the ka24e motor in it. I love the KA because it's an easy platform to work with, and reliable if you know what you are doing. I've decided to boost it, so i'm going to be doing a lot of things to prep the car, but there are a couple things I need to find out first.

1) Is there a way to check if I have the higher compression KA. Engine has 110,000 miles, and has 150psi per cyl. Across all 4 cyl.

2) Is 5-7 psi going to be safe for dailying this motor? (t3 t4 turbo) WITH a walbro 255 fuel pump, stock injectors, and a tune.

I was raised working on cars, and I try to learn as much as I can, I could do N/A work on a 4 cyl. All day long, but forced induction is still new to me. Any info would be awesome.

--
My list of things to get:
Turbo ?
Manifold ?
Wideband downpipe ?
FMIC ?
Oil filter sandwich adapter ?
Oil temp unit ?
Oil pressure unit ?
Oil feed + drain lines ?
Wideband ?
Boost gauge ?
Walbro 255 ?

I think there are couple more things, but you get the point. I'm trying to avoid a FMU or standalone ecu.

Thanks in advance!
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post #2 of 7 Old 07-23-2017, 07:26 AM Thread Starter
 
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I put checks for the first 4 items, and X's for the rest. Didn't know the page didn't support it.
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post #3 of 7 Old 07-24-2017, 03:39 PM
 
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Quote:
Originally Posted by 370nick View Post
1) Is there a way to check if I have the higher compression KA. Engine has 110,000 miles, and has 150psi per cyl. Across all 4 cyl.
You said you have a ka24e. It has a lower compression ratio (8.6) than the ka24de (9.5). 9.1:1 can be found in later model single cam motors in early 89. Without a bore gauge and other specific tools, I don't think there's a way of identifying the CR just by looking at the motor.

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Originally Posted by 370nick View Post
2) Is 5-7 psi going to be safe for dailying this motor? (t3 t4 turbo) WITH a walbro 255 fuel pump, stock injectors, and a tune.
You'll be fine, I highly suggest larger injectors for t3/t4 turbos. You'd max out the injectors before you'd even make the kind of boost you wanted. Top feed injectors can be found everywhere from rx7's, subarus, etc.

------------------------------------------------------------------

For all things turbo you can check out the ka24det/ka24et subforum or go to www.ka-t.org ? Index page for even more information.

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post #4 of 7 Old 07-25-2017, 02:59 PM
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Without a FMU or Standalone you can't really tune it unless you're getting a Flashed ECU.

There is nothing wrong with an FMU. I would actually recommend it due to the fact your looking at keeping stock injectors. The stock 270cc or whatever stock SOHC injectors are won't support 5-6psi from e T3 safely without upping pressure more than 1:1.

As mentioned above because you have a SOHC you have factory top feed injectors so swapping in bigger OEM injectors are easy.


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post #5 of 7 Old 08-04-2017, 04:05 PM Thread Starter
 
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Thanks for the info guys, it helps a lot. As for things like injectors, ill run super low boost (like 3psi). I was going to work my way up with a boost controller, and when I get the money i'll get higher cc injectors. When i get them, will i need to change out the fuel rail as well? I know i'll have to get a FMU, injectors, maybe fuel rail, I will already have the fuel pump, and anything else for fuel system?
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post #6 of 7 Old 08-10-2017, 10:22 AM
 
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It's not possible to run 3psi. You can't boost lower than what the stock wastegate allows, which is most likely 7-8psi. You can modulate the throttle for 3psi, but you'll never be at WOT for long. For higher feed injectors you won't need to change the rail. There are other cars which supply larger top feed injectors to choose from. You won't need an FMU if you get a ROM tuned ECU. You should be fine for fuel, maybe even change out the fuel filter if you haven't done it in a while.
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post #7 of 7 Old 08-22-2017, 05:32 PM
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Assuming it's a T3/T4 with external Watergate it is possible for him to run 3-4psi with the lightest spring available from Tial. Now is 3-4psi worth it? IMO probably not. I don't expect you to make more power than a rebuilt healthy KA24DE with bolt ons. Most Turbos aren't rated to run that low. It'll do it. But I doubt the compressor map for most T3/T4 Turbos will tell you what the Turbo will do under .5 Bar

However. You can get boost creep from over coming the amount of flow the Watergate can expel. Chances are it won't happen with a small turbo but not impossible.

Like stated prior and Flashed ECU for a KA-T setup is far better than any FMU setup so that would be the ideal route to go.


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