Going KA-T, now what?

[Simmsled]

I am looking to piece together a turbo kit for my Altima (94 KA24DE). I am looking to do a system that I can learn on. I am looking to put together a low boost (6-7psi) kit. I know the basic parts and I can build about anything. I am going to be learning how to weld, one of the machine shop guys at work (Valeo Sylvania) is going to hopefully teach me and I will be buying a welder soon. For this first project, I will probably not do any welding myself (maybe later tho). The turbo manifold for the 240 is the same as the Altima, so that helps greatly.

If anybody has a useful turbo or bov or whatever parts, I would be willing to build a custom projector bi-function HID kit for their car. I am going to be building two of them for my dad and for REPOMAN. btw, its the same projector that is in the Q45 HID conversion FAQ page. It has high and low beam together.

I need to know what I should do about fuel management too.

[znelson]

Fuel management, I have my N/A setup for a decent turbo application already, j60 maf/walboro 255/370(SR) Injectors/Nismo FPR. Wasnt too heavy on the wallet and itll get the job done up to/around 260hp, after that might wanna step up injectors.

[Simmsled]

I was thinking of using an Apexi SAFC II for fuel management. I would like to get some of the 370 injectors, those seem to be the best for low boost on the KAs. Would I have to upgrade the MAF?

[hannibal]

S13/S14 MAF is good til 240-250whp and I'm assuming the Altima MAF is identical. SR 370cc injectors max out at the same point.

[znelson]

Im pretty sure alot of the altima mafs were n60's, I think thats the same as the na z32.. I know the z32tt is an n62. The n60 maf would be a worthless investment in my opinion, wont get much more than the stock KA. ( I could be wrong on that. ) Get an n62 or a j60 if you are gonna be doing more than ~250hp. Ive got another j60 (rb25) maf if you want it, let me know ill give it away for a good price (and ill take a video of it working for you). Anyways, goodluck with the build, always need more turbo ka's rolling around!

[hannibal]

Nelson, all Z32s (NA and TT) had N62 MAFs. The N60 comes from the Maxima. Ive heard its capable of 300-350whp. I never seen an exact number though. I think everybody's just guessing based on Maxima supercharger kits at that power level retaining the stock MAF.

I kept saying N60 instead of N62 in your thread about the J60.

Simm, I think the SAFC is a good bet. If you stay under 7-8psi, you shouldnt have to worry about timing.

[znelson]

Nelson, all Z32s (NA and TT) had N62 MAFs. The N60 comes from the Maxima. Ive heard its capable of 300-350whp. I never seen an exact number though. I think everybody's just guessing based on Maxima supercharger kits at that power level retaining the stock MAF.

I kept saying N60 instead of N62 in your thread about the J60.

Simm, I think the SAFC is a good bet. If you stay under 7-8psi, you shouldnt have to worry about timing.

Eh.. my bad on the z32 mafs. You can get n60 mafs pretty cheap ( <20$ on ebay) so if they are capable of 300hp thats a real good buy for the build.

[Simmsled]

sweet. Yah 7 psi is the goal. For better mpg on the highway would it be better to use something bigger than a T25? Also, I am using my auto transmission. I plan on doin a 5 speed swap as soon as one of the two(motor/transmission) goes. Altima stuff is cheap at junkyards because not very many people buy the stuff.

[hannibal]

At 2500rpm where the T25 starting to buid boost, a bigger turbo wouldnt be spooling much. I think its a great compromise. I like hte idea of being able to stay out of boost during cruising/part throttle situations.

Also, if youre convinced you want to stay around 7psi, the bigger turbo will give you more power at that same level of boost.

About fuel/timing/mgmt, the SAFC is capable of getting the job done, but you could add a JWT ECU (and continue to use the SAFC to lean it out a bit).

[Simmsled]

Thats good to know. So what turbo would work best u think?

I will probably get the safc, but the JWT ecu is too much $ for this project. I will not be boosting more than 7 or 7.5 psi. Old motor and transmission in excelent shape, just needs a little more go.

[j-z]

a straight t3 would be a good choice especially since alot of them come stock on nissan motors and can be had easily and fairly cheap.

[SeVa-S13]

a straight t3 would be a good choice especially since alot of them come stock on nissan motors and can be had easily and fairly cheap.

I agree. If you want to stay cheap, maybe get a rebuilt Z31 turbo which is basically an old T3 60 trim with .63 a/r turbine; a pretty standard choice for low boost KA guys.

[hannibal]

Seconded (or thirded???)The Z31 T3 comes with a 'standard' (67 trim) exhaust wheel while most straight T3 (and T3/T04E) setups use a stage 3 (76 trim) wheel. The standard wheel should help it spool faster.

Stock wastegate is set to 6.5psi. I'd guess thats about 210-220whp with supporting mods.

[rant] For some reason, new T3's cost more than T3/T4 hybrids. Not sure why, but if youre trying to do this on a budget, the rebuilt Nissan T3 is a good deal, IMO. [/rant]

[kornaz]

Sorry to hijack the thread, but i am planning on running a T3 .50trim 63A/R turbo on my S14. And @ 70mp/h my rpms are 3K exactly. So if the full boost is @ 3K rpm, then i would be boostin all the time?

[torque2go]

thats only with full throttle.

[dj_hype]

Sorry to hijack the thread, but i am planning on running a T3 .50trim 63A/R turbo on my S14. And @ 70mp/h my rpms are 3K exactly. So if the full boost is @ 3K rpm, then i would be boostin all the time?

no. you only build boost when there is a load on the engine. my turbo gets to full boost at 2600rpm. but when i'm rolling at 80 on the interstate at a constant speed, my car runs in a 10-12 in/hg vacuum. when i get on the throttle a little bit i can build a little boost or full depending on how much throttle i give it.