first ka-t build, discuss

[PowerbyPSI]

so im new to the nissan game but ive been putting together my own turbo setups for a few years now. except ive only messed with hondas.

the turbo kit itself isnt my biggest issue, its figuring out how to go about managing it. a simple chipped ecu and bigger injectors is all that i would need when dealing with hondas, an safc was out of the question.

after scouring these forums this is what ive come up with for turboing my 1991 ka24de.

custom log manifold by met3/t4 .63 .50 a/r3" turbo back with muffler and 3" glasspack to quiet it down.fmichks bov vented to atmosphere not recirculated (cant seem to find the pros and cons to this but my friend runs his this way on his sr)rx7 460cc injectors with projectsilvia top mount fuel railwalbro 255lphstock mafbkr7e gapped around .038-.035 to startplx m300 of course

now i want to break 250whp can i do this decently with the 460cc only running an msd boost timing master and safc? is the 255lph fine by itself or will i need the bump the fuel pressure? figure 10-12psi would do it.

any pointers on where to start with the boost timing master? i know hondas generally go for .9 per psi for basemaps but yes i know its a completely different subject.

yes im a newb.

EDIT: i just saw this top mount fuel rail kit. i have a set of rx7 460cc injectors, so scratch the 370cc.

Modified by PowerbyPSI at 8:45 PM 9/13/2007
Modified by PowerbyPSI at 8:06 AM 9/14/2007

[neverlift]

first off how do you plan to use said sohc maf? if you going to use the de ecu its out the question. PLUS your not me many ways to tune the injectors, some hack mafs, others tuen the stock shipped ecu, some go biki, even people on here use eghey tunes( I wouldnt, but thats me). Hell afc has been known to hang...

btm IDK I think its weaksauceass bandaid.... but you can use it, I think a few here run them, I prefer a good tune to take care of timing..

if you have rom tune history and pick up fast, check out hybridka, you may want to go that way....

[PowerbyPSI]

ive never tuned myself, and plus this setup is probably going to change a lot. any downsides to using the stock DE maf?

[neverlift]

IDK. I just used it since I'm using a sohc ecu(made less work of the whole thing), not alot of people want to step down to obd0, I like it though. Most opt for a shelf tune and use afc to fine correct fuel. Do a littel research on ka turbo setups and you will probably be able to make a better choice, I'm a rom tune at home guy so thats the response you will get from me, however I'm looking into afc's for on the go adjustments.

[WDRacing]

I was running 20 psi on a SAFCII and MSD BTM setup with the same turbo you chose except I was using 42lb injectors at 60psi of static fuel pressure and a touch of alcohol on high boost.

Daily driven she was set at 1 bar (14.7) psi. I set my BTM to .5 lbs of retard per psi and it worked great.

Many people on here will dis the SAFC, I think they just had a hard time or operator error leading to a problem or three and decided it's easier to blame a box rather then take responsibility.

Those are the guys that swear by the ROM tunes...personally I like the ability to change the tune if I want to.

I'm working on a complete standalone fuel system at the moment. Basically it's setup to run off of a MAP sensor and only add fuel in direct proportion to boost. This will let everyone keep their stock ecu and MAF and totally eliminate the idle problems everyone has.

But don't ask when it will be out, most likely not till next summer.

WD

[Jookmasta]

ill say to just get a z32 maf to just get that part out of the way. also an adjustable fpr would help. everything else seems copesthetic. for the btm, we usually use .75 in regards to the KA24DE..........

[neverlift]

I was running 20 psi on a SAFCII and MSD BTM setup with the same turbo you chose except I was using 42lb injectors at 60psi of static fuel pressure and a touch of alcohol on high boost.

Daily driven she was set at 1 bar (14.7) psi. I set my BTM to .5 lbs of retard per psi and it worked great.

Many people on here will dis the SAFC, I think they just had a hard time or operator error leading to a problem or three and decided it's easier to blame a box rather then take responsibility.

Those are the guys that swear by the ROM tunes...personally I like the ability to change the tune if I want to.

I'm working on a complete standalone fuel system at the moment. Basically it's setup to run off of a MAP sensor and only add fuel in direct proportion to boost. This will let everyone keep their stock ecu and MAF and totally eliminate the idle problems everyone has.

But don't ask when it will be out, most likely not till next summer.

WD

lol its funny you think I botched an afc install/tune , main issue is it advances timing with the fuel you add for boost nope.

now as for me being bias towards safc I'm not, but when you can have a fully working tune that needs no fuel correction, because its tuned to the needs you have and SHOULD have some overhead for future upgrades, why use safc A LOT OF people cant do rom tunes, I can. If I couldnt I'd be on afc and btm myself, not twittling my stick you know.. now the btm is why I say bandaid, without it you would blow a motor thanks to the afc addign timing. Ask my boy hawk about it. " I had some lean spots so I added fuel with an afc, 55 miles later I blew the motor" we both got up about the same time, I am still runnign strong he will be back up and running in the morning IIRC

cost comes down to purchase most of the time, I was broke when I neded a tune, afc was out(going for 150+ at the time on the bay)

as for being able to change my tune no problems here 5 minutes max including removal/install/changes. emulator and some datalog or consult and your doing realtime tuning for less than a NEW neo safc.

I daily drive my car too man at 7~9psi depending on my mood, drift that ***** all the time, with stock 270cc injectors and sohc maf. I geuss it really doesnt matter its all personal choice in the end, damn sure dont pick one because its what someone else had luck with choose what suites you.

Just get it done by whatever means you choose. damn I didnt want to waste that 5 minutes.

[WDRacing]

lol its funny you think I botched an afc install/tune , main issue is it advances timing with the fuel you add for boost nope.

I did mean you actually. More AZHitman then anyone...lol.

The key is to use the MSD BTM/SAFCII combo. I've preached timing retard on boost FOREVER. NA mapping and boost is stupid...period. I don't care if your's works or not, I THINK IT's waiting to blow up.

The BTM starts retarding timing prior to it actually being needed, so as to provide for an extra safety margin as well as compensate for the air flow meter's signal being adjusted causing a different load map being used for timing.

BTM FTW

[neverlift]

why you think its waiting to blow up? my cheapness?

get over it, 21.5vac for idle man I'm gravy or you saying my ecu setup is bad 500miles HARD boosting, 4th gear'd a bike sat, he wouldnt even slow up to talk after I lifted for traffic(his lane). Point is I dont baby this ***** at all, if anyhting I have been trying to kill the thing. tire wise I've gone through two sets in 1/8th the time I could finish one n/a(gonna need to buy bigger rims/rubber soon) blah I beat this thing like a pimp does his whore. and great mileage for boost. 25+ my nizzle all city/wot pulls