Announcement

Collapse
No announcement yet.

engine choice

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • engine choice

    I know there are hundreds and hundreds of ka vs sr threads, which I've read over the years, so I understand if you all don't care to answer.

    Did an oil change earlier this week(engine is a ka) and the oil was far from even being ok, very grey and shiny. I guess it could be from cams since I just swapped them about a month ago, but doubt it since they are stock cams. Don't have engine noise as of now and still running good, but I'm getting ready just in case.

    I can't decide to stay with n/a ka or go ka-t. Finding another ka and throwing it in and staying n/a I know is the cheapest and easiest route and leaves me more $$ for events, but I also really like FI. Car is used for only autox right now but hope to start doing road coarse in next year or so.

    Opinions on what you all would do?

    thanks,
    Ryan

    Edit: no more sr as a choice. just n/a ka or ka-t
    Last edited by ryansx; 03-23-2014, 04:55 PM.

  • #2
    Can of worms=opened. Just kidding. KAs are cheap and plentiful but to go FI the right way requires you to build them. SRs are easy HP for the $$ but require some effort for the swap. You don't have to build them for under 400hp so that saves some $$. Both with FI will require proper cooling to survive track day duty, pretty much like any higher HP engine including LSx & VQ. That's my 2 cents.
    Chicago Region SCCA SM # 688 http://www.scca-chicago.com
    TSSCC SM # 688 http://www.tsscc.org

    Comment


    • #3
      thanks. I'll add that I'm not planning for big numbers. If I went to FI I would be perfectly happy with around 200rwhp. And from what I read up on ka-t.org with a t25 at wastegate pressure will get me there and stock internals will hold up fine(with correct fueling and tuning of coarse) any thoughts on that? If going sr route it would be just a refresh not a built engine. Cooling I have covered already actually, was one of the first things I made sure to do before starting autox.
      Last edited by ryansx; 03-22-2014, 07:34 AM.

      Comment


      • #4
        200hp is less than a stock SR at stock boost. But yeah, keeping the boost low will net you reliability even on a stock KA. That being said, hp is addictive. I'm now over 320hp to the wheels on an ultra conservative dyno and want more.
        Chicago Region SCCA SM # 688 http://www.scca-chicago.com
        TSSCC SM # 688 http://www.tsscc.org

        Comment


        • #5
          Oh I know sr isnt but about 160-170whp stock but it would be easy to get it up to 200. I've done research for both. Not expecting to be spoon fed info or do sr vs ka thread. I have gone back and forth with staying n/a, ka-t, or sr for past 2 years. So now that its looking like my current engine may come apart soon need to decide and just trying to get some help to make me pick a route to go and stick with it

          Comment


          • #6
            I think its worth it to do a proper setup with a T28 and good fueling (ECU tune, larger injectors) and cooling. My preference would be SR, but for under 250whp the added cost of the engine may not be worth it.
            ~1992 240SX, SR20/Koni track day car
            ~2016 M3, daily driver

            Comment


            • #7
              If you have an sr that just needs freshening and you are looking for 200whp, what's the question? Nothing wrong with going ka but freshening an sr is the cheaper easier way to have what you want and room for more hp. Stock everything and get 240whp. T28 and stock everything and you have 285whp.

              Comment


              • #8
                I think that 285 with a t28 might be a bit high. Even the difference between t25 and t28 seems high.

                I have a bone stock sr20 except air filter and large fmic and it never felt like 245. I changed to a brand new Nissan t28 and felt no difference. Granted, its a track car so there is extended time between driving it but I think id notice the Oh Wow factor of 40 more Hp

                Maybe not....

                But suffice to say, the sr swap is well documented and not rocket science. If you're swapping out your motor anyway and have an sr, just do that. Besides, isn't it significantly lighter?

                Comment


                • #9
                  When I went from the stock T25 to a S15 T28 it was a huge increase in power and drivability. I did up the injectors and go to a Z32 MAF at the same time but it was relatively inexpensive / easy for the HP.

                  Sent from my SGH-M919 using Tapatalk
                  Chicago Region SCCA SM # 688 http://www.scca-chicago.com
                  TSSCC SM # 688 http://www.tsscc.org

                  Comment


                  • #10
                    Originally posted by jfryjfry View Post
                    I think that 285 with a t28 might be a bit high. Even the difference between t25 and t28 seems high.

                    I have a bone stock sr20 except air filter and large fmic and it never felt like 245. I changed to a brand new Nissan t28 and felt no difference. Granted, its a track car so there is extended time between driving it but I think id notice the Oh Wow factor of 40 more Hp

                    Maybe not....

                    But suffice to say, the sr swap is well documented and not rocket science. If you're swapping out your motor anyway and have an sr, just do that. Besides, isn't it significantly lighter?
                    I dyno'd 300 rwhp with a T28 dropping down to about 15 psi at redline. The T28 at 10.5 psi was putting out more air than the T25 could struggle at the 12.5 psi it was dropping to at redline. Definitely stronger than the T25 without a doubt, and it spooled up a couple of hundred RPM faster being ball bearing.
                    '18 Chevrolet Volt - Electric fun hatch for DD duty!


                    DefSport Koni Sleeve and Spring Perch Buy!!!
                    http://www.nissanroadracing.com/showthread.php?t=5902

                    Comment


                    • #11
                      I feel like this question is asked monthly.

                      Comment


                      • #12
                        Originally posted by Beejis60 View Post
                        I feel like this question is asked monthly.
                        im not asking to compare sr to ka, there are plenty of circlejerk threads on zilvia that lead no where if I wanted to do that. I know pros and cons for both. I know what goes into doing both and doing them correctly.

                        I'm trying to get some opinions so I can make myself choose which route to go and stick with. How about I change my choice to stay n/a ka or go ka-t. I'll edit first post to get rid of sr as an option.

                        Anyone have experience autoxing with both? possibly someone who ran ka-t setup with low 200whp?

                        edit: yes I am looking through ka-t.org right now too

                        Comment


                        • #13
                          My personal opinion - the overall costs of a KA vs. SR up to about 300 rwhp are probably pretty close. SRs have gotten cheaper than they were 6-10 years ago, and you can get S14/S15 engines for that cheap price so a reliable 250-280 rwhp setup is super easy.

                          Up to 400-450 rwhp, I think the SR is actually cheaper as it can do it on the stock engine for quite a long time. The KA probably can't do that for as long IMO just comparing the internals.

                          After that - it's all big money so again, the cost of the engine swap isn't that big of a deal in the grand scheme.



                          For 250 rwhp I'd get an S14 SR, drop it in and rock out. Shorter 5th gear, T28, VCT. Toss on a decent oil pan, your usual FMIC/bolt-on getup, get a good tune and some injectors like Subaru STi 525's or S15 480's and you're set for gas, or you could even get Nismo 740's and run E85.
                          '18 Chevrolet Volt - Electric fun hatch for DD duty!


                          DefSport Koni Sleeve and Spring Perch Buy!!!
                          http://www.nissanroadracing.com/showthread.php?t=5902

                          Comment


                          • #14
                            Not to make this a t25v28 thread, but addressing the two experiences of a lot more power with the t28, one was changing more than just the turbo. A z32 maf, injectors (and obviously a tune) is a lot more than just a turbo.

                            And with the second (and possibly the first), it isn't stock boost.

                            I'm only commenting on my experience with a stock motor, including .5 bar wastegate.

                            If the 28 is significantly better as pressure increases, I don't know but it is valuable info as most I'd imagine will increase their boost.

                            And again, maybe there was more of a difference than I realized as it can be weeks between track days for me.

                            But my experience, take it or leave it, was that there are better ways to get more power for the money if you have a stock motor.

                            Comment


                            • #15
                              As far as the KA vs KAT. It will take some $$$ to get 200whp out of a NA KA. Regardless, it will be pretty close to the edge of what you can do with it so reliability will not be what you typically think of.
                              Chicago Region SCCA SM # 688 http://www.scca-chicago.com
                              TSSCC SM # 688 http://www.tsscc.org

                              Comment

                              Working...
                              X