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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 03-16-2007, 01:37 AM   #1
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Default DIY install 99% finsihed. NOW WITH PICS!

Hey guys.

I have been installing my kit on the weekend an in the evenings this week.

I went for the first test drive last night - low timing and running rich for safety, man, this is SOOOO FUN!

The kit:

t25g
ebay stainless mani
diy dp
emanage blue (not tuned yet)
305cc supra injectors
ebay front mount with alluminium piping and silicone bends.
rx7 afm...

So simply, yet so effective. I haven't been taking many photos cause i'm up to my elbows in grease, but I just wanted to share!

Something I want to know is: I have a wideband still to install. Should I run it all the time along side the stock one, or do they deteriorate quicker than the stock ones? I have a Digital A/F ratio guage (the autospeed/jaycar one) which I want to use for tuning, but I don't know if I should leave it in there, or only put it in when tuning is required.

What do you guys do?

60AGS

Last edited by t25miata; 03-19-2007 at 09:41 AM. Reason: added in pics.
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Old 03-16-2007, 01:49 AM   #2
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I have my AEM wideband installed all the time. Good to monitor how your tune is doing for varying conditions that you might drive in or under. The only deteriorate faster if you have them close to the turbo, they get too hot. Should be about 3' from the turbo.
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Old 03-16-2007, 01:55 AM   #3
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Thanks! So back near the cat is a safe bet then?

I'll weld the second O2 female in tongiht then!

Man I love this car. I drove it without the hood on and no mid pipe (just dp!) Geez it sounds good!
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Old 03-16-2007, 02:05 AM   #4
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Yeah you want the sensor a minimum of 10* above horizontal otherwise moisture will collect on it. You have to place it before the cat obviously, for example mine is about 7" before the test pipe flange. Nice to hear the car is running, get some pics when you get cleaned up.
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Old 03-16-2007, 02:10 AM   #5
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I have the stock one only about 6" after the turbo, is that gunna kill it? I've just realised that it's pretty close too...

I'll get some pics asap.

60AGS
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Old 03-16-2007, 02:14 AM   #6
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I just installed my wideband recently. I welded the bung 5 or 6 inches before the cat. Seems to be working fine for me, except there seems to be a bit of a delay in the readings and im not sure if that is how far down the pipe it is or if it is because I am running the stock ecu with only an AFPR and an Throttle body from an automatic which seems to not work right with the ecu because im reading stoich on decelleration.

Anyways, i think its better to install a bit downstream from the turbo and running every day should not be a problem other than maybe needing a new sensor in 4 or 5 years.
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Old 03-16-2007, 02:16 AM   #7
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Quote:
Originally Posted by t25miata View Post
I have the stock one only about 6" after the turbo, is that gunna kill it? I've just realised that it's pretty close too...

I'll get some pics asap.

60AGS
just out of curiousity, how is the response of your gauge when it is closer like that? I feel like I might be getting a bit of a delay, or maybe not. When i step on the throttle, it seems like it does not adjust immediately. maybe thats normal idk
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Old 03-16-2007, 02:17 AM   #8
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Having your stock sensor there will also damage it I believe, I could be mistaken though. My stock sensor is about 1.5 feet away. Though i'll be removing it entirely eventually.
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Old 03-16-2007, 02:18 AM   #9
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Quote:
Originally Posted by akaryrye View Post
just out of curiousity, how is the response of your gauge when it is closer like that? I feel like I might be getting a bit of a delay, or maybe not. When i step on the throttle, it seems like it does not adjust immediately. maybe thats normal idk
When under heavy accel i get fast readings but if i'm decelerating or i just jump on the gas real quick my readings will jump around a little, like it takes a second for things to even out for it to get a good reading. We have similar WB sensor placement.
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Old 03-16-2007, 02:26 AM   #10
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yeah, same thing here. You have a test pipe right? I was thinking possibly the backup that the cat creates could cause some issues with getting a good reading but if you are seeing the same thing with a testpipe, i doubt that its affecting it. You know, its probably completely normal and I am just ----.
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Old 03-16-2007, 02:30 AM   #11
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Quote:
Originally Posted by akaryrye View Post
yeah, same thing here. You have a test pipe right? I was thinking possibly the backup that the cat creates could cause some issues with getting a good reading but if you are seeing the same thing with a testpipe, i doubt that its affecting it. You know, its probably completely normal and I am just ----.
Yep no cats for me, i'm allergic.
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Old 03-16-2007, 02:34 AM   #12
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Having your stock sensor there will also damage it I believe, I could be mistaken though. My stock sensor is about 1.5 feet away. Though i'll be removing it entirely eventually.
Ahh crap. It's a really nice weld too!
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Old 03-16-2007, 09:53 AM   #13
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Originally Posted by t25miata View Post
Ahh crap. It's a really nice weld too!

my stock sensor used to be 2-3" inches from the turbo (as are plenty of of members here), they can stand the heat better than the wbo2s. dont worry about it.
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Old 03-16-2007, 11:16 AM   #14
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my stock sensor used to be 2-3" inches from the turbo (as are plenty of of members here), they can stand the heat better than the wbo2s. dont worry about it.
Glad to hear it, I was never sure of how "strong" they were compared to the wb sensors.
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Old 03-16-2007, 01:06 PM   #15
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BTW:

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Old 03-16-2007, 01:26 PM   #16
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^ Its true you know.
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Old 03-17-2007, 09:01 AM   #17
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Yes, it is true. **** it, better get some pics soon then...

I have EMB issues though, so i'm not exactly doing this atm:

60AGS

Last edited by t25miata; 03-17-2007 at 09:01 AM. Reason: spelling
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Old 03-19-2007, 09:40 AM   #18
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Well, what can I say. I started putting time and effort into a turbo kit on the 7/9/06, and turned the key on the Wednesday 14/3/07.

I wanted to be on the road the whole time, so I had to collect little by little.

Fast - Cheap - Reliable: Pick any two. This is the formula for modifying a vehicle. I chose cheap and reliable, so I'm never going to be pushing 150rwkW out of this baby, or dragging Skyrines from the lights while both wheels scream with smokey pain...

What I wanted: low down torque, and enough power on tap to be able to overtake when you need to (for road driving, that is the only reason to go FI IMO). The track is another story!

I started looking for bolt on kits, but nothing anywhere near my price range included an intercooler. A must in Brisbane heat IMO if I want "reliable" to be my choice. The more I looked, the more I realised that a lot of those kits were missing essential parts, or contained parts that would need replacing. After finding www.miataturbo.net I decided to build a DIY kit with what the parts I wanted to have, at about the same price as pre-built kit from GReddy. Obviously my power goal was to match the stock GReddy kit, (so, nowhere near "fast") but produce that power more safely with an intercooler and a better fuelling system.

The basics:

T25g turbo from an SR20det from a 180SX
GReddy eManage piggyback - fuel and timing control, as well as a very cunning closed loop device for while on boost
EBay intercooler
89 Toyota Supra 305cc Injectors
Heaps of custom stuff (fabbed with the help of several very good mates! )

Here are heaps and heaps of pics (some are of the same thing) that are in no particular order.

































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Old 03-19-2007, 09:40 AM   #19
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Not tuned yet, so no reports on seat of the pants performance. I'll add updates when they happen. Having eManage issues.

60AGS
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Old 03-19-2007, 10:05 AM   #20
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Quote:
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Fast - Cheap - Reliable: Pick any two.

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