KA-T Plans, any advice?

[Razi]

Hi spooled! Yeah I read through your thread twice, I like you car.I was also thinking about reverting back to stock like you did and go back to the turbo after I pass.We'll see in 2 years.

Also I found the bung part number just in case anyone needs it.Part # 14052 - 21R00

I searched a little more and found out a little more about the sensor on the downpipe, supposedly it will throw codes if it isn't plugged into the downpipe, I will weld a bung there and keep the sensor on there.

[1unar3clipse]

The O2 sensors, isn't there one up on the manifold and one on the downpipe on the stock exhaust parts?

I thought only OBDII had multiple O2 sensors.. My 93 has only has one on the exhaust manifold.

I can check the 97 240 next door but I was almost positive OBDII has one on the exhaust manifold and then one between the pre-cat and cat.

[Razi]

Alright, I'll check it out once I start pulling things out and see if I have another o2 sensor back there.

I'll probably have more questions as I start gathering more parts.Thanks for being patient with me guys.

[spooled240]

Hi spooled! Yeah I read through your thread twice, I like you car.I was also thinking about reverting back to stock like you did and go back to the turbo after I pass.We'll see in 2 years.

Also I found the bung part number just in case anyone needs it.Part # 14052 - 21R00

I searched a little more and found out a little more about the sensor on the downpipe, supposedly it will throw codes if it isn't plugged into the downpipe, I will weld a bung there and keep the sensor on there.

thanks man if ya need some help w/ the ka-t you can IM me at mach3gtsr

I thought only OBDII had multiple O2 sensors.. My 93 has only has one on the exhaust manifold.

I can check the 97 240 next door but I was almost positive OBDII has one on the exhaust manifold and then one between the pre-cat and cat.

my 97 has two of them; one in the manifold and one in the downpipe before the cat. I think OBDI uses only one O2 sensor, I heard s13 OBDI ecu's only using one sensor.

[night240]

i know my **** won't be ka-t parts lol

[Razi]

Alright guys!I got everything I need except for my Walbro pump and most importantly my TURBO. Very excited .

BUT (big but)I was going to get a SR T25 with all the necessary elbows and what not for 190, supposedly in awesome condition.But yesterday I got a message telling me he found oil in the compressor housing, also had side to side shaft play but no in/out shaft play, and told me he could lower the price by 60 which I might be able to haggle.

So my question is, should I buy this T25 for 120-130 and buy a rebuild kit and try to do it myself as I take my time?Or wait to find another T25? (Which is looking to be difficult to find in good condition)

I have a CA T25 (I think) just chillin in my garage but it has slight in-out shaft play. Should I just buy a center section for the T25 and call it a day with a fresh new turbo?
Modified by Razi at 1:06 AM 11/24/2008

[spooled240]

I would rebuild the one you have. Is it really bad play? Turbo's are supposed to have a little bit of side to side play..keep in mind that a used t-25 in OK condish can be had around a 100 bucks

[Razi]

Yeah I would really like to rebuild the one I have now, but it has in/out shaft play so I believe I need a brand new center section which I'm looking into right now. Hopefully everything goes smoothly.

[s14derrick]

if you can;t get him to go down on price i have a sr t25 that i think needs a rebuild ill sell for cheap cheap.i dont have the skills or tools to rebuild

[480sx]

Before you get a brand new t25 centersection(which would be a huge waste really), why wouldnt you just get a good working order t28 or something. I wouldnt spend the time or money rebuilding a t25 either. DIY t25 rebuilds are really risky unless you have an angle wrench or can borrow one. The t25 shaft is tiny and warps easily. Those things are common for a 100-150 bucks in working condition.

[s14derrick]

for the same price of the center section you can probably find a good working t28

[WDRacing]

Keep the stock EGR stuff, you'll throw a code if you don't. Just have the EGR pipe routed to the downpipe. Real easy and cheap if you bring it to any muffler shop.

WD

[Razi]

I would like to get a T28 but don't wanna get a tune for it :\I will probably just hunt for a T25 since I'm already setup for one already.
Modified by Razi at 3:55 PM 11/24/2008

[spooled240]

you won't have to tune a t-28 any differently than a t-25 IIRC. A turbocharger is merely a device to force air into an engine so different turbo's shouldn't require different tunes.

[Razi]

I would imagine that the T28 would push more air into the engine than the T25, so wouldn't it lean out the A/F ratio?

Also my CA T25 has in/out shaft pkay so a rebuild won't save it would it?
Modified by Razi at 8:40 PM 11/24/2008

[480sx]

Your running a FMU setup right? A t28 would be fine man, the 8:1 gives you plenty of fuel. I wouldnt run a huge turbo with a FMU obviously, but a t28 doesnt flow THAT much more air than a t25.

Its hard to say about your CA turbo. You really would need to take it apart to be able to tell. Are you sure the wheels never contacted the housings?

[Razi]

Alright thank you 480, I will be on the lookout for a t28.The CA turbo might've hit the housings, the turbine is seriously less than a hair's width away from the housing.I'm in the process of talking with the person I purchased it from.

Thanks for your input 480

[kouki_hmongster]

you won't have to tune a t-28 any differently than a t-25 IIRC. A turbocharger is merely a device to force air into an engine so different turbo's shouldn't require different tunes.

w/ bigger turbo it requires a retune since the spool time and flow is going to be a little different. the timing map should be changed if you are planning to upgrade from t25 to something like a gt2871r.

[spooled240]

hmmm interesting. I think that would only apply to a drastic turbo upgrade like going from a t-25 to a t3/t4 or something. People with sr's switch between t25's and t28's all day with stock tuning.

[WDRacing]

You're not going to need a retune with a T28 upgrade. If you were using a TO4E or something maybe then...but the FMU has been used with a TO4E at 8 psi many times just fine.

[Razi]

I got my eye on a S15 T28, I don't know much about those but those are fine right? Direct bolt-on, no need to clock it.

If I take my car to an exhaust shop and they bend the EGR pipe over to the downpipe and all that. If I go back to stock, I just simply bend the EGR pipe back over to the stock location with no problems? I would imagine that the pipe could snap from fatigue. My ECU would throw codes when the EGR is plugged because the O2 sensor would sense something is wrong with the air fuel mixture?

[spooled240]

the egr valve is mostly for emission purposes and your engine will produce more HC(hydro carbons) emissions w/out it connected. An engine will produce a little more power without it connected since it is only using fresh pure air(instead of recirc'd exhaust gases)....but the EGR helps keeps engine temps down.

I would recommend not touching or modifying the OEM EGR valve or pipe and have the muffler shop fabricate something on the downpipe that will connect to the EGR. You don't want to have to bend the pipe over and over.

s15 t-28 should be direct bolt on, but I heard they are $$$....not worth it for a low boost setup IMHO. Just find a used s14 t-28 in good condition.

[kouki_hmongster]

You're not going to need a retune with a T28 upgrade. If you were using a TO4E or something maybe then...but the FMU has been used with a TO4E at 8 psi many times just fine.

i'm just curious, if this is true then if i were to upgrade to a gt2871r i can still use my same enthalpy ecu tuned for t25? now i'm kind of lost, since i was told by scott from enthalpy that if i was going to upgrade to t2871r then i would need a reflash. scott told me the timing would be different if i was to upgrade.

[spooled240]

I don't really understand this, why would you need a different tune for different turbo's? When I got my JWT chip, those guys just asked me how much hp I wanted. They told me that I need a z32 mafs and nismo 555cc injectors that was it.

It just seems to me that a t04e turbo on 8 psi would still run the same way a t-25 on 8psi would

[WDRacing]

A MAF measures airflow, thats how it corrects for load. The tune isn't based on turbo size, it's based on fuel injector size.

Also, there is a huge difference between a GT2871 and a T25 or a simple T28. What Scott probably meant was that you'll need more injector and a new tune.

[spooled240]

that's what I thought

[sololock]

reading this thread makes me want a KA-t. with this setup about how much HP will this setup make my 24de?

[480sx]

You will be at low 200's at 7-8 psi. You dont really wanna push a FMU setup farther than that.

[spooled240]

at 8psi, you will be at 200 at least..maybe around 220 right?

[Razi]

Yeah should be around there.

So guys I might be picking up a S15 GT28R real soon.Anything I should know about? I would imagine the oillines would be the same, JGS sells kits as T25/T28 so they should work, I imagine.