Making My ka-t as reliable as possible..

[Supra_turbo]

Im holding a steady 230whp at 8lbs on a t4 turbo right now on stock internals.. just fuel management and tune... Its my daily and i want it to be as reliable as possible, not looking for big power yet.. any ideas ?

[eazye2000]

Tune was the important word my friend.

As long as it's 'tuned', you should be golden. As long as you didn't just slap on crap and just start going at it.

Is it an ECU/ROM tune? Piggyback? What you got going on?

[sommmatt]

/threadjack/Where/how/how much to tune? /threadjack/

To keep a car reliable, well, there's all the standard stuff, such as drive it like a human being and not like a teenager, listen when the money light comes on, don't abuse it, use higher octane fuels maybe?

[Supra_turbo]

its a greddy emanage... I bought it tuned to 8 psi.. but i dont know the tuner who did it.. I might have to get it checked out... what ya thinkin ?

[Supra_turbo]

runnin 93 all day.. lol i jus cant help my foot at times tho.. love the boost, especially from a big t4.. but im a controlled driver.. very conservative with the throttle

[480sx]

230 hp is low for a t4 turbo at 8psi you should be higher than that.

What fuel mods and tuning system do you have?

[480sx]

Your lucky you didnt blow the motor. You need to get that tuned dude, dont drive in boost untill you do. 8 psi on a t4 turbo is much different than 8 psi on a t25.

[Supra_turbo]

it is tuned... supposedly...

[Florida240sx]

it's greddy so most likely very rich and conserv timing. Crank it to 10psi. Get another block and try 14psi on this one. Clutch will most likely give before your motor will

[Supra_turbo]

does that mean im safe for daily driving.. easy on the foot... sometimes...

[coolbone28]

All we can do is make assumptions. The ONLY way to know is to take somewhere and dyno it with some wideband readouts. Or get/borrow/steal a wideband...but you still wont know how much you are putting down for sure.

[spooled240]

yeah but have a conservative tune will definitely be more reliable imo. I'd say 12:1 a/f ratio would be about average for the daily turbo car

Your lucky you didnt blow the motor. You need to get that tuned dude, dont drive in boost untill you do. 8 psi on a t4 turbo is much different than 8 psi on a t25.

I don't understand, he said he got a greddy tune for 8 psi so he should be good. His tune is reading is the air flow from the mafs not what kind of turbo he's running. 230rwhp does seem low for a t4 on 8 psi tho

[Supra_turbo]

Its a t70 on stock internals... i dunno man i jus want a reliable boosted daily.. No sr involved.. =)

[480sx]

I mean more than likely your just running super rich, but you still should get that tuned on a dyno, you'll see a huge power increase and better fuel econ.

I mean going on what he said, it just sounded like a shadey tune. From some random guy with some random car. You never know whats in there, and to start boosting without knowing your in safe AFRs is not what you wana do.

A t4 compressor wheel moves more air at 8 psi than a t25 at 8.

[NateDogg]

Get yourself a wideband. Check your plugs. Get some heatshielding for the brake M/C and/or get your turbine housing and downpipe ceramic coated.

If you are too rich that could dilute your oil and cause excessive bearing wear in under 1000 miles.

[Supra_turbo]

damnit so technically i got go have a dyno tuner check my tune and make the proper adjustments... IF theres any

[GTR PrYdE]

damnit so technically i got go have a dyno tuner check my tune and make the proper adjustments... IF theres any

No. You don't have to do anything.

YOU asked what to do to make your car more reliable. And you've gotten plenty of good answers.

[480sx]

damnit so technically i got go have a dyno tuner check my tune and make the proper adjustments... IF theres any

There is without a doubt, 100 percent sure adjustments that need to be made.

[spooled240]

I mean going on what he said, it just sounded like a shadey tune. From some random guy with some random car. You never know whats in there, and to start boosting without knowing your in safe AFRs is not what you wana do.

A t4 compressor wheel moves more air at 8 psi than a t25 at 8.

Well he never said that his car was running like crap, we just kinda assumed that there was something wrong cuz of the weak hp numbers. I know where you're coming from, I would want to know the cred. of the guy who tuned it.

I think the first thing you should do is get a wideband, you will know everything just from that little gauge..just try and get some afr numbers before you tear into it and spend a lot of money at the dyno shop

[Supra_turbo]

hmm.. so a wideband sounds like one of the best investments i can make for this car..

[spooled240]

yeah man, i would be dying to know where my afr's were at if my car was running weird, i mean knowing this can be the difference between having a running motor and a blown motor.

[Supra_turbo]

kool... the search begins !

[morbid]

Find out from people on the forum who is a good tuner in your area. No point in taking it in to get tuned if your taking it in to joe shmoe

The good part is you should also see some good power gains after the tune too. I'm not 100%, but I think with your setup you could be making a lot more power reliably. Maybe shoot for 300whp?

[gaehrings13]

Give me a call at 786-286-1738 im running a t70 t4 at 9lbs making 280hp... The guy who tuned my car is a really good tuner in miami just give me a call, if i don't answer just leave a message. He is in the opa locka area... I don't know if you know the dyno shop but its called Twilight Performance.
Modified by gaehrings13 at 1:03 AM 10/29/2007

[WDRacing]

I dunno where you guys are getting your numbers from. Over 200 whp on 8psi of boost is good. That means it's running safely and actually making decent power. 99% of people think they are making more power then they are. Whether it be tuning or the dyno itself...people are almost always wowed by how much power they aren't making.

230 in a S chassis is a fun little daily driver. Especially since the bigger turbine has a "flash" spool effect.

If you want reliability, you really need to do as suggested, get a wide band and see what the AFR is on and off boost. If it's in the 11's on boost and it's running smoothly, then leave it. Your best bet is to post the AFR with a dyno chart so we can best assist in the tuning. Just remember, rich = safe.

Also, as a rule of thumb the increase in whp is about 10 per lb of boost. If you're close to that window then you're doing well.

WD

[Titan]

"Over 200 whp on 8psi of boost is good."

Pressure means nothing without flowrate. 8 psi on a T25 is completely different than 8 psi on a T4. Worlds apart in terms of moving air. This is because we are dealing with dynamic (moving) air, not static.

Also, this is why air tools, for instance, are rated for flowrate (scfm) as well as operating pressure.

That being said, 200 rwhp at 8 psi on a T4 is low. I hit just below that on my T3 at 6 psi.

To the OP: Not to sound like an ***, but you're asking how to keep your motor reliable, yet your emanage is supposedly tuned? Get yourself on wideband and make sure you're seeing approximately 11.5-11.8 at WOT. Keep off the pedal until then.

[spooled240]

yeah a t4 turbine wheel is like a 747 boeing engine, it wants to pass a ton of air with out spinning too fast and making the bearings red hot like a t25.

WD, do you mean "flash" spool as in that viscious pull you feel all of a sudden when a large turbo starts spooling?

[Supra_turbo]

I dunno where you guys are getting your numbers from. Over 200 whp on 8psi of boost is good. That means it's running safely and actually making decent power. 99% of people think they are making more power then they are. Whether it be tuning or the dyno itself...people are almost always wowed by how much power they aren't making.

230 in a S chassis is a fun little daily driver. Especially since the bigger turbine has a "flash" spool effect.

If you want reliability, you really need to do as suggested, get a wide band and see what the AFR is on and off boost. If it's in the 11's on boost and it's running smoothly, then leave it. Your best bet is to post the AFR with a dyno chart so we can best assist in the tuning. Just remember, rich = safe.

Also, as a rule of thumb the increase in whp is about 10 per lb of boost. If you're close to that window then you're doing well.

WD

Good advice from all thank you much.. A wide band will be invested in and very soon =D sounds like a serious necessity

[WDRacing]

"Over 200 whp on 8psi of boost is good."

Pressure means nothing without flowrate. 8 psi on a T25 is completely different than 8 psi on a T4. Worlds apart in terms of moving air. This is because we are dealing with dynamic (moving) air, not static.

Also, this is why air tools, for instance, are rated for flowrate (scfm) as well as operating pressure.

That being said, 200 rwhp at 8 psi on a T4 is low. I hit just below that on my T3 at 6 psi.

To the OP: Not to sound like an ***, but you're asking how to keep your motor reliable, yet your emanage is supposedly tuned? Get yourself on wideband and make sure you're seeing approximately 11.5-11.8 at WOT. Keep off the pedal until then.

I never assume someone would install a T2 framed turbo. When I explain something I usually assume that people are going to run atleast a semi efficient turbo. Also, numbers don't really increase when switching to larger turbo until you're running quite a bit more boost. Even a small T3 is efficient at 8psi. But anything over 8-10 psi will always lend to the bigger turbo.

Thanks for pointing out the difference, very good explanation.

WD