What should the next step be on the KA-T?

[ZiG]

Just looking for a few suggestions as to what I should do next. I would like to max out the power I can make on the T25 @ 7 psi before raising the boost, because I'm worried about blowing the head gasket or something.

Here's what I'm currently running.. Havent dyoned it since I installed the FMIC, so I know there's some power to gain there by redoing my ignition timing table.. But it only made 170 (to be fair, it was a mustang dyno) with the side mount. Seemed to wanna knock easily, even on 94 octane..

-Megasquirt standalone ECU-SR t25 @ 7 psi-3" turbo elbow, downpipe, test pipe & catback-SR 370cc injectors-FMIC-Innovate LC1 wideband-Knocksense MS knock ‘controller’-eBay turbo manifold-electric fan-TB coolant bypass-MSD Blaster SS ignition coil-Bkr7e plugs

I'm thinking maybe a camshaft upgrade? Not sure I wanna spend the cash on PDM cams right now, so I was thinking maybe I should find a stock exhaust cam and stick that on the intake side, if it would be worth it?

[Charlie240sxt]

I'd check your tune and maybe find some power there since you've added FMIC,but you said that opps. Yea cams i would go aftermarket turbo ground cams tho. The valve overlap is kinda bad for turbo cars in the 248 EX cam used as an intake cam you tend to end up pushing your aircharge out alittle(some say).PDM isn't the only cams out there for the ka look around. Also start looking at a better manifold that flows more. A z32 maf would also help so you could turn up the boost alittle 9psi(but you also said you didn't want to)?? just watch your wideband.

Other then that some head work. Maybe look into a free air crank case system. A blow though setup some say they feel a smoother power band


Modified by Charlie240sxt at 7:54 PM 4/27/2008

[Tyler]

bigger injectors?

[480sx]

If you want to get the max power out of your engine, find a pro and let him tune your car. Somethings up with your tune, either you need to lean it out or add more timing. 170 at 7 psi is pretty low, you should at least be near the 200 mark on a mustang dyno.

I mean at only 7 psi on a t25 it shouldnt be heatsoaking your IC, even a SMIC. Still, now that you have changed to a fmic try to retune it. Compare your IAT's from your side mount wot data logs with the IAT's from the FMIC ones and see if there is a big difference.

Are you sure you have your knock meter set up correctly? You might be getting false positives and thats causing you to run less timing than you should.

Whats a free air crank case system?

[krazydriver]

Zig, i've got the 248+5 exhaust cam thing going on for my intake. If you follow the writeup and redrill it for the +5 timing, it actually decreases overlap by .7 degrees i think. Made quite a difference in my car NA.

btw i got my car runnning.... 3 days later (tonight) the freaking starter dies on me.

[480sx]

Lol MS owns starters

[krazydriver]

ehh it's just the solenoid. it's not the actual starter motor... so it should just be a quick fix.

[ZiG]

Haha yeah, MS is a little hard on the starter. I've been considering upgrading to MS2 for the false trigger protection. That or a wheel on the crank.. I just hate the hideous noises it makes sometimes.

Anyway, yeah I'm sure it was knocking, because I could hear it. It was tuned by a pro on the dyno but since the engine was running pretty hot (200*F) and the IAT was like 100.. We added a bunch of fuel for cooling, otherwise it would knock pretty easy. And then I checked my logs later and realized that the TPS was only reading 93% throttle on all the runs. Turns out the floor mat was under the pedal and causing it to not go down all the way. But yeah, since we added fuel for cooling, and now I have the FMIC, I know there should be some gains to be had there.. The AFR goes as low as 10.8 or so..

As far as upping the boost, maybe. Just a little worried 'cause it's a stock head gasket, but I guess people have run more boost on a stock hg before and been fine, long as the tune is good..

And good advice on the cams.. I was aware that the exhaust cam swap caused some overlap, but I thought it still would be a net gain? I guess I would redrill the gear though.

As for a MAF, no worries there, because I run a MAP.

Thanks for the replies, keep 'em coming!
Modified by ZiG at 12:19 AM 4/28/2008

[ZiG]

Oh yeah, just remembered one other thing about my setup at dyno time.. I was using a stock SR turbo elbow, downpipe and cat. So add up all those changes, retune and I should be wellll into the 200s.. right? Someone at a local shop said it'd probably be north of 230, 240.. but I dunno about that..

[480sx]

Yea thats a pretty big restriction on your exhaust side, if you removed that stuff you should have a much better run. I wouldnt expect it to jump 60+ hp hehe, but you should be in the 200 range.

[ZiG]

Oh yeah, that exhaust stuff is long gone, I just had to borrow it from someone until my new stuff arrived. Well I guess I'll re tune, consider the exhaust cam swap (or new cams) and then I guess it'll be time to crank the boost a bit and see what happens.

Oh, and I will keep an eye out for a t28. heh.

[Charlie240sxt]

Whats a free air crank case system?

Mods dont hate me its for the better good. plus we should all be friends

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