MSNS v2 or rom tune. (semi-building na ka)

[NoPistons!]

So here's what i've got so far:

sohc pistons
Decked block and shaved head
248/232 cams
3" to 2.5" exhaust with SR dp and stock s14 ka mani.
ARP rod bolts. ARP exhaust studs.
Secondary butterfly delete
Emissions delete


Wanting:
Itb's (either open or closed)
DIY portwork. 3 angle valve job. Stock springs/retainers. Polished exhaust ports and combustion chamber
264/264 cams
jwt template/cam gear mod
4-2-1 header
underdrive pulley kit
1pc AL driveshaft
2pc lightweight flywheel



Not sure about management. I have 3 stock ecu's including the auto one i've got running the car now. Price is about the same and there's a large variety of chipping and programming out there now to choose from. I can't make a decision. Going to be NA for a good bit until i find the right tuner to see if we can make shit happen with a snail hi-comp without blowing it up or running race gas. My mind was pretty made on rom tune until i realized the tps would be the biggest issue with the gixxer throttles.

I'm on a budget and a cage, body work, new seats, paint and another set of wheels is up there on the priority list. Boosting a stock short block would work on an safc tune but that's not my style and i really fell in love with the engine that came in the car. I think it's really cool and has potential all motor to do some damage on the track and on the "closed course" corners while maintaining good gas mileage and keeping it on 87 pump.

What would you do in my situation with that goal in mind? I'm semi-comfortable with wiring and can work a soldering iron well, can read, can google. Just need some advice.

[[email protected]]

first of all do not run 87 octane on a high comp motor. detonation for sure and second of all, i'd be iffy turboing a high comp. motor with stock sohc pistons. its asking to blow up for sure.

[NoPistons!]

Oh, forgot to add meth injection... My bad.


Um, engine management. Lets talk about that. K?

MSNS v2 or rom?


If i could tune for 87, i would but like you said, detonation. Car is going to be fed nothing but 93 until i find a logical means to safely run lower octane IF that's possible. I haven't seen it yet. 3 of the tricks to combat ping are meth/water injection, smoothing and polishing potential sharp/hot spots and thermal coating (swain for instance). I went back specifically to piston motors for this reason and actually was wanting to do a ka-t in my old rx7 for a long time. I've had my 240 for 2 months now, should be on the road first week of october and then i'll just go from there. My main concern is getting a tune and having the ability to datalog.

[4x4le]

Gsxr throttle bodies, do they have a tps or a way to send a 0-5v signal? I dont think itbs would be the best option once you boost but will be nice while n/a.
As far as the secondary butterflys go, as far as i have seen they do their job by providing extra tq down low at part throttle but open up when the petal is pushed down so removing them makes little sense to me.

If you were doing a low comp build and adding a turbo i could see water meth being more of an option but your compression ratio is most likely over 12:1 and spraying into itbs isnt going to be safe or consistant so that is pretty much out. You need to run premium.

I need to look into having a custom image made for me so i can ignore the maf and tune based off of tps, or split tps voltage into tps and mimic maf from that and then nistune could handle your engine n/a.

I have done some n/a kas that supprised me.

[NoPistons!]

I like the way you think. Um, i've been hunting around trying to find the range on the suzuki tps (yes, the gixxer/busa/cbr have tps).


If i boosted hicomp a 48/48 t25 would do the trick. Saab t25's are plentiful and i can get em all day for a good price. I had two i let go, wished i still had my ball bearing ceramic r34 jawn but shit happens and sometimes you gotta do what you gotta do.

And yeah dude, i'll be NA for a while. I'm pretty hellbent on having something fun and responsive. The honda guys have vitaras. I was hoping there were some oem pistons that would work with ka's that are tough enough to task this on a budget. My main focus is getting a tune and building my itb rig. I'd love to get that done before January so when tax money comes in i can pull the trigger on more stuff. MAYBE get some forged pistons at a 10:1 ratio and roll the dice on reusing the rod and main bearings. Engine has 2k on the clock. Barely broken in.

I failed to mention i'm at a 90mm bore as well.

Most would say this is a waste and i'm better off building a hi-comp sr20ve but the torque and sound of the ka has me. It's an impressive son of a bitch.


My biggest thing is if i have itb's and i'm na, a plenum would be an airflow restriction. Intake piping would be a restriction. Wall friction would cause a rise in intake temps. Negligable but i'm trying to do the best i can on a budget. Still wanting to cage the car, paint it, get some aero crap that matches...etc....

[4x4le]

Do not reuse bearings. their crush has already been spoken for once

[NoPistons!]

Ah hell. Ok. Well i've got it figured out now.

[NoPistons!]

Bump for gixxer tps. 1v at idle and 4v wot.


See you guys in the na ka section with some work soon hopefully.

[4x4le]

Should work, is that the range on the tps or recommended voltage rand when used on gsxr?

[NoPistons!]

From what i'm reading, voltage when used on the gixxer/busa. So if you're troubleshooting the tps on those bikes, that's what it should read at.

[NoPistons!]

Edis4 trigger wheel with power steering. I googled. I ka-t.org-ed. Nada. Also hit up the "we build fast shit" shop to see if they could come up with something with no luck.