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Discussion Starter #1 (Edited)
Just got it running tonight and strong at 8 lbs of boost.

Specs:

1995 GA16DE w/h 45,000 miles on the clock
1990 GA16i 5-speed manual transmission
Garrett T25 turbocharger (S13 SR20DET)
185cc fuel injectors (I know, right?)
Walbro 255lph fuel pump
Nissan Maxima N60 MAF sensor
A'pexi S-AFC 2
sequential blow-off valve
wideband (not sure what brand)







Here is the story about the injectors. I have a spare fuel rail with Nissan 370cc injectors in them, but essentially, they flooded the GA16DE and the S-AFC 2 couldn't compensate. On a whim, we tried the stock 185cc injectors, and the engine runs amazingly well (perfect in regards to air/fuel mixture ratio) up until 5 lbs of boost. It starts to lean out about 5 lbs, and tomorrow we are going to try and compensate for this with the S-AFC 2 since we didn't get a chance tonight. If we cannot compensate, I'm digging out my 259cc injectors from the KA24DE I have laying around. P.S. the GA16DE with the T25 is an absolute beast!

All the random wires are for the wideband, and will not be there once the car is tuned properly. I also have an S13 SR20DET side-mount intercooler that will be installed once everything is tuned up. I am going to run the car tomorrow night at our local dragstrip, so I'll post results. I also have to get a downflow pipe made tomorrow to mate the turbo elbow to the stock exhaust.

For the N60 Maxima MAF, we had to run the S-AFC 2 at 2 In and 7 Out, which for some reason works amazingly well. When I ran the GA16DE normally aspirated, I ran it at 1 In and 1 Out, but for some reason 1 Out doesn't work worth crap with the N60 MAF. Go figure. It has been a fun two days with little sleep. I also need to install an oil restrictor into the oil feed line (we thought there was one already, there isn't :( and it burns a little oil coming down off full boost).
 

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Nice man. Did you buy the kit or piece it together? Not to far from a little boost myself. Just trying to get the old lady to let me run with the card in hand.
 

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Discussion Starter #3
Basically pieced together over the span of a year. I got the T25 from a friend who had it laying in a corner in his mother's garage (he had originally run it on his KA24DET before upgrading to an RB20DET with a T3/T4 hybrid), who gave it to me for free because, and I quote, "my mom wants me to get my shit out of her garage so just take it!" The compressor housing outlet is from the original T3 turbo on his RB20, and the sequential blow-off valve I also got for a steal ($10). I bought the S-AFC 2 on eBay for around $150, and it is in great condition. The turbo manifold is from TSI, and I also got it on eBay at an absolute steal of $150! These manifolds are $399 brand new! Just the manifold!!!

All the couplers and miscellaneous aluminium piping came from my RB20 friend, who had everything stuffed in a box. We basically laid everything out, and then coupled it all together and tightened it down. The N60 Maxima MAF was also found in his garage... he had actually forgotten he had it and found two one day while scavenging for an alternator he had misplaced. He donated the worse off MAF for my little B12. He is also the one who supplies me with 370cc and 259cc injectors, since he builds KA24DET engines as a hobby... no joke.

I know it sounds bad, but I really don't bum all this stuff off him. We work together on his project cars... i.e. I do all the dirty work. We've done three engine swaps this month already. On top of that, we crank out built KA24DET about once a month. He makes all the profit off of it, so he isn't bad off. Here's our pride and joy KA24DET we are assembling:

KA24DET block (honed and decked)
Wiseco pistons (stock bore)
Nismo H-beam connecting rods
ARP head studs
port & polished cylinder head (new valves)
660cc fuel injectors
Empalthy tuned ECU
Greddy eManage Blue
VH45DE throttle body (Q45)
T3/T4 hybrid turbo
higher flow oil pump
stage 4 clutch & pressure plate (forgot what brand, sorry)

She'll be a beast, and best of all, she's going in an S12 200SX!
 

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Discussion Starter #4
Installed the 259cc injectors and tuned the car last night. No more leaning out at top end under full boost! If I am really brazing my balls, I can take the turbo up to around 12 lbs of boost now before maxing out these injectors. Not that brave right now... especially in an 18-year old car. We took my B12 out to the boondocks, and ran several passes at full boost using a wideband and tuning the car with my S-AFC 2. She runs perfect, and hits a full 8 lbs of boost around 3300-3400 rpms in 2nd gear. Fortunately, my Exedy Stage 1 clutch is holding up fine... I'm more worried about the halfshafts and CV axles to be honest taking a crap one day while under boost :(. I, without a doubt, need to replace them soon... maybe even next paycheck.

Sometime this week, I plan on installing the intercooler and an oil cooler as well. I am going to be using an oil sandwich plate off an S13 240SX... ironically, it mates up just fine and no leaks (tested it out last night as well but did not permanently mount). Go figure... both engines run the same oil filter! GA16DE = baby KA24DE... except for the oil squirters and crank girdle (argh Nissan!).
 

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I think that's cool that people are still doing the turbo thing w/ the ga16de. I kinda wish I did that instead of the sr20. The ga16 engine just seems more solid to me. Anyways good work!:thumbup:
 

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KA24DET block (honed and decked)
Wiseco pistons (stock bore)
Nismo H-beam connecting rods
ARP head studs
port & polished cylinder head (new valves)
660cc fuel injectors
Empalthy tuned ECU
Greddy eManage Blue
VH45DE throttle body (Q45)
T3/T4 hybrid turbo
higher flow oil pump
stage 4 clutch & pressure plate (forgot what brand, sorry)

She'll be a beast, and best of all, she's going in an S12 200SX!

now that's what i'm talking about! like the q45 mod too..
:thumbup:
big ol butterfly valve.
 

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Hey Biscut's whats the A/R on the turbo? I am going to try an duplicate this same package but with a auto trans...... Was the head professionally ported or did you do it with the hope that it would flow better? I mean I have been here before and to be honest I'm not sure if it's even worth the trouble with a turbo?? I'm not sure how bad the flow of this engine is but I suspect that it can use all it can get and would benefit from a simple casting clean up and port match. Other than that i will just let it rip and be happy!! Any plans to hit a chassis dyno yet? You should be able to dial it in perfectly then.........
 

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Discussion Starter #9
Hey Biscut's whats the A/R on the turbo? I am going to try an duplicate this same package but with a auto trans...... Was the head professionally ported or did you do it with the hope that it would flow better? I mean I have been here before and to be honest I'm not sure if it's even worth the trouble with a turbo?? I'm not sure how bad the flow of this engine is but I suspect that it can use all it can get and would benefit from a simple casting clean up and port match. Other than that i will just let it rip and be happy!! Any plans to hit a chassis dyno yet? You should be able to dial it in perfectly then.........
I assume you are asking about the T25? I honestly don't know the A/R on it... it is just the stock Garrett T25 that comes on the SR20DET. Couldn't tell you the specs because to be honest, I have no clue! My cylinder head is not ported... it is port-matched to fit the manifolds. I enlarged the ports on the TSI turbo manifold slightly so it wouldn't blow out exhaust manifold gaskets, and the intake ports are matched to the stock intake manifold. I am not really sure how well this has helped performance, but a friend with a dremel did the job and he's pretty good at that stuff but no professional :(. Honestly, the flow of the TSI turbo manifold is very good, and the T25 hits 8 lbs around 2800 rpms (with the new 259cc injectors as I found out tonight :) ) so that really isn't a problem in terms of flow. Since I do not know of a chassis dyno around here, I seriously doubt I'll put it on one.

Update: I ran my car tonight at the local 1/8th mile dragstrip. Unfortunately, the computer was down so no times :(. But, I did stomp the crap out of a B16 CRX my friend owns that is mighty stout... something like 185 bhp on it when he dynoed it a while back. To top it off, he plans on turboing it as well! It'll be a mean little thing that's for sure. He got me off the line, but my third gear he was in my rear view mirror. Next weekend I'll post the times when they get the computer fixed.
 

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Discussion Starter #10 (Edited)
It has been a while, and I've changed a few things, so here is a new update on my car:

First, the A/R of the turbo is 80.

I do not have an oil cooler on the car, simply because I couldn't get the sandwich plate to fit along with the oil filter and turbo oil feed line. The power steering pump is in the way, along with the knock sensor and is just generally very awkward to get to. On top of that, if a line ever burst, it would be pure PITA to fix or to work around. So, scratch that. To compensate, I change my oil every 3 months (irregardless), and I use on Mobil 1 10W-30 full synthetic. It costs a hefty price per quart, but I don't prefer on killing a turbo or my engine anytime soon.

After putting it off for quite some time, my Optima battery has been relocated to the boot (trunk) in order to make room for my intercooler. To my surprise, the relocation was quite simple and took less than an hour to do. In regards to my planned intercooler, it will sit basically where the stock battery tray did, and will have computer fans helping to circulate air through it. I am going for a real "sleeper" here, no FMIC for everyone to see. Also, I am going to cut slants into my hood directly above the intercooler, and have them angled for better airflow. But, that is later down the road.

Biggest news lately has been me thinking my turbo died. In reality, the turbo has absolutely no shaft play and is in pristine condition. My exhaust manifold gaskets both blew out and a nut on one of the four studs connecting the manifold to the turbo also disappeared. Now that I have replaced the manifold gaskets, and replaced the missing nut, my B12 is back in top form and pouncing on rivals left and right. Once I find my camera, I'll take pictures of the obliterated gaskets.

I also learned there is a B12 Coupe here in my town who has a complete Bluebird SR20DET swap, running GT28 turbo, and putting down like 16 lbs of boost. He came into my friend's work last week... his is red, while mine is maroon. Once I meet up with him, we'll have a photo op.

Also, Wes, if you are reading this: I noticed on your website that you had your exhaust valve bowls ported. What valve stems are you using? I assume you couldn't reuse the stock GA16DE ones after all that?

P.S. the KA24DET is in the S12, and is running! I'll also post pictures once my camera reappears. We need to reinstall the differential (had to have it welded), fabricate a mount for the transmission, and button up everything. Also, a wheelie-bar.
 

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Discussion Starter #12
Another update:

We tried to install the intercooler tonight, but no luck. There just seems to be something always stopping things from working correctly. So, for Christmas, I will be getting a FMIC setup, hopefully (crosses fingers). I am a bit concerned about removing the front bumper and then reinstalling it, as it is an 18-year old car and it has never been done (to my knowledge). We took the front bumper off of the '85 S12, and just about half of the bolts ended up stripping out or breaking off. Not an ominous sign for my car. I am also getting at least a stage 2 or 3 clutch, because mine slips at full load when not warm. Not a fun experience when you are merging onto the motorway. We are going to try again on the SMIC later on this week, hopefully when it is not SNOWING outside. Yeah, it was cold. Also, we are going to tune my car for winter soon, so I'll also post those settings as I posted the summer ones earlier.
 

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Isnt the Maxima MAF sensor also suck through and not blow through?

Personally I think she will run smoother if you plce the MAF before the turbo, just after your filter - I did this on my GQ16 and I can still run the stock MAF sensor even under 1 bar boost

Intercooler is a must though - I ran top mount for almost two years and only then went front mount - What a difference!
 

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Discussion Starter #14
It doesn't make much difference on mine whether it is pre- or post-turbo. It actually runs much smoother post-turbo, especially on deceleration. No bogging or power loss as I have experienced on most turbo cars. We were actually going to go pre-turbo though because of the intercooler placement, but it all didn't work out so it is still a blow-through setup currently. If I do go FMIC, I will most likely still leave it post-turbo because of tuning and idling purposes.
 

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hey did you ever hit your engine with your timing gun to see what the timing is..i was told today by apexi that the safc2 isnt good to use while turboing an N/A car because the computer advances timing and everthing. is that why you retard your timing to make up for that.
 

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Discussion Starter #16
I believe my timing is retarded, but I haven't been free to check it with a timing light yet. I've been working 8 hr days since I got in town, so as soon as I can I'll post it for you. Yeah, A'pexi will tell you that because they don't want to be liable if you blow up your car.
 

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ya i kind of figured that. my buddy has an integra and he had the apexi on it but it wouldnt let him do more then 8psi of boost so now hes getting hondata.
 

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Discussion Starter #18
The S-AFC 2 has no control over how much boost you run, the wastegate has that job. But, if all he could produce was 8 lbs of boost because of max'd injectors or MAP sensor limits, that sounds more realistic. Hondata and DSMlink are great tools; it is unfortunate Nissan does not have something as widely available as those.
 

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ya i kinda figured that. well im getting my manifold here soon and im going to start the swap but i was still wondering if you know your timing yet. you said it was retarted but by how much. whats the stock timing on these engines? also how long do you think it would take to put the turbo and everything on. im using your safc setting for now untill i can get the wideband hooked up. i think it would be the same saying im running everything you have just the turbo is a mits. t25. also thanks for all your help through out my build
 

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BeyondBiscuits:

Would you mind if I contacted you through AIM to pick your brain a little bit about what goes into swappinng a GA16 engine and transmission into a B12 sentra? I have a line on a free 88 sentra with a four speed and a blown e16i motor (timing chain) and but have NOT had any internet time lately so I haven't been able to wade through the diverse sentra info to find out details like crossmembers, axles, ecu, wiring etc.

If I can make it work with the stock wiring harness then I *just* might follow in your footsteps, save a MAP and a megasquirt for your Maxima MAF and piggyback system.. depends. Hmmmmmmm... maybe it WOULD be better to just get a head "for now" and save for the full drivetrain...
 
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