I thought i would post up, especially for those who have given advise, that the KA-T is on the street. I must say thanks to Matt, Dan, Jeff, John, and anyone else who has contributed to one of my many posts seeking help/answers or sold me some of their used goodies. I am very pleased with the setup and it feels sooo great to be boosted. I've always wanted a turboed car. lol, I already want more boost, 8 psi, or is it 5 I really can't tell since the gauge reads 5 but the wastegate has an 8 lb spring in it, is just not cutting it. lol. I do not need a boost controller or my motor will be laying in shambles on the side of some highway. Only thing left to do is drag her up to a dyno to get tuned. I will be out at Super Target wednesday showing her off if anyone wants to critique my setup or ask questions about what I have gone through to get my car to where its at.

Again, thanks to all who have contributed to the success of my turbo install.

PS: If anyone has a datalogger and KNOWS how to tune with it via S-AFC and wants to make some money let me know and we will work something out.

 

pics would be cool

 

yes they would wouldn't they? When I get home tonight I will put pics up.

 

They have dataloggers for 240's? I'll have to look into this on a nissan board, who sells them?

 

How do you find the limits of the fuel you're running without the help of the knock sensor? I've always just assumed it was tuning mojo that came with experience. The wideband lets you dial in the fuel curve perfectly, but the knock sensor lets you figure out what the maximum boost level you can run is, say, on pump gas. Keeping the a/f ratio at around 11:1 you crank the boost until you start getting knock then turn the boost back down a bit to get rid of it. I mean, that's a simplified tuning strategy for idiots (like me) and it doesn't account for timing, and fuel fine tuning after that, but without the knock sensor how do you know when you're reaching the limitations of your fuel on your setup?

 

Whozie whatzits?
11:1? Knock sensor? WTF!?
Our knock sensor cuts out at WOT and/or 4k rpm. Or something like that, so a KA can't use a knock sensor to tune. Basically, to find the limits of your fuel setup, you use the BSFC, which we already know on a KA by heart. 370cc = 270hp, 525cc (50#) = 350-360hp, ect. Then make sure you're in the 12:1 area. I don't know about setting timing though. Most tuners have done it long enough they can hear and feel which way the timing needs to go, and it's done in small increments. Like a Ford 302, advancing/retarding timing 2* from perfect (42*) yields a 15hp loss.
-Jeff

 

I'm talking about the limits of the detonation resistance of the fuel you're running. You can only push it so far on 93 octane before you reach the limit of the fuel and it starts knocking. In the DSM world, the knock sensor is the primary tuning tool, I feel that you need a wideband to get the fuel curve right but at least going by the knock sensor/timing advance you can avoid going into detonation, even if that method of tuning does lead to running way too rich to mask knock caused by setting the boost too high.

 

Congratulation, Tyler. Glad to see it running. Where is your wastegate source running to? and where is your Boost gauge source running to? If you have an 8psi spring, and only reading 5 on the gauge, maybe you have the wastegate getting reading from the compressor housing? and the boost gauge in the intake manifold might only be seeing 5psi due to a pressure drop? (but that big of a drop in those JRC FMICs would be really bad.) The Autometers I hear are sometimes up to 2psi inaccurate. Check your boost gauge line make sure its tightened good.


Anyways, have fun. I/ll try to make it to Wed. night Target meet to check her out. It will be probably around Christmas/New Year's when I finish mine, I have decided to throw in a few extra goodies and do things right the first time.

Any plans to build a motor? Mine is gonna be started on in a few mnoths.

 

I highly doubt im gonna push the envelope of boost to make it knock on 92 octane. I have the timing retarded ~16 degrees to be on the safe side until I get to the dyno. I mentioned the datalogger because that's what I read somewhere, although it was for tuning dsm's, but figured the same priciples applied. I do believe they have a datalogger for Nissan, like Hondata I think they ahve one called Nisdata. Who do you guys recommend me taking the car for tuning? Any compitent shop with a dyno, or should they specialize in Nissan like XAT? Maybe I should buy an egt guage and learn my self trying not to blow things up. The manifold I have has the egt port on the 4th cylinder runner. Can you get an accurate egt reading off of one cylinder like that or does it need to be reading after all runners have combined? If i do buy an egt gauge, anyone want to make some money teaching me and helping me set my car up? I'd rather buy the gauge so when I want to turn up the boost I can re-tune my car w/o relying on taking it to the dyno, and I'd rather know that much more about my car.