1994 1.8 Turbo - Critique & Advice? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 03-26-2013, 12:13 PM   #1
Newb
Thread Starter
 
Join Date: Mar 2013
Location: Cardiff, UK
Posts: 21
Total Cats: 0
Default 1994 1.8 Turbo - Critique & Advice?

Hey Guys!

I recently picked this 1.8 Turbo car up as a base for a track car I want to build.

On getting it back from picking it up, it definitely needs some work and a good map. It's not quite the full package I thought it was, but I think it will be a good base to work on. There are hesitations on wide open throttle and at part throttle. Also the turbo seems to spool, (noise wise) but nothing happens speed wise until about 4200rpm (2k rpm after you hear it spin up). The wheels and roof are terrible, and will be being changed ASAP!

I also found the shitty Ebay manifold to be cracked and the exhaust is blowing all over the place. Other than that, I am happy.

Hopefully I will be replacing the cracked manifold with a BEGI, FM or Artech manifold. Anyone have any advice on this? I realize with any of those options this will mean I will need to change the downpipe too as the turbo orientation will be different, but I have also seen this Ebay cracked manifold replacement from Artech....

http://www.artechfabrication.com/Tac...eplacement.php

What are your thoughts on manifolds guys?

The turbo is definitely a Garrett T25... that's all I know 100% and that it has an FSE power boost valve.

I am in talks with Dimitris to provide me with a MS2 to take care of the management side of things. I am decided on MS for sure after reading countless good reports on both here and MX5nutz.

In terms of checking the car over and working out what to order next, what would you guys be looking at? I really am a newbie when it comes to turbos!

Any help you guys could give me would be hugely appreciated!







Attached Thumbnails
1994 1.8 Turbo - Critique & Advice?-2013-03-24133854_zps3bba0bf6.jpg   1994 1.8 Turbo - Critique & Advice?-2013-03-24140357_zps5b67308c.jpg   1994 1.8 Turbo - Critique & Advice?-2013-03-24140434_zpsa3221561.jpg   1994 1.8 Turbo - Critique & Advice?-2013-03-24141128_zpsd55a958b.jpg  

Last edited by Adz9; 03-26-2013 at 01:56 PM.
Adz9 is offline   Reply With Quote
Old 03-26-2013, 01:55 PM   #2
Newb
 
Join Date: Nov 2012
Location: Quebec Canada
Posts: 36
Total Cats: 1
Default

Im not sure but for a track car I would use a turbo that spool a little bit faster to avoid lag.. maybe an expert could argue on that.

MS is the right way to go! im looking for one at the moment!

And your car looks pretty good!! i like the Tan soft top
stevenmiata is offline   Reply With Quote
Old 03-26-2013, 02:06 PM   #3
Elite Member
iTrader: (2)
 
Join Date: Aug 2012
Location: Indianapolis
Posts: 3,325
Total Cats: 235
Default

T25 is as small as you ever want to get on a Miata engine.

Cracked manifold will hurt spool quite a bit.

You'd have to look at shipping, but if you can find one it might be cheaper to buy an exact copy of the manifold you have on Ebay and send it to artech, might be cheaper than shipping it from the UK. Otherwise just pull the old one off and send it to Abe.

However you might be better off going with a new downpipe also, since I wouldn't trust the ebay one and it probably flows like crap too. Exhaust is another thing to look at, from the state of this car already I am going to assume that it is probably running the stock exhaust. You're gonna want to trade that for a 3" straight through.

Ducting the rad and a coolant reroute will be necessary cooling mods for turbo + track.

Also lose the hideous wheels.
thenuge26 is offline   Reply With Quote
Old 03-26-2013, 02:15 PM   #4
Elite Member
iTrader: (13)
 
Join Date: Dec 2006
Location: Taos, New mexico
Posts: 5,702
Total Cats: 237
Default

If you are serious about tracking it, go inconel studs with resbond (assuming this is still the current practice of the track guys). There is a thread on it somewhere here.

Also go quality manifold/downpipe. I think artech is a good idea. I like my BEGI cast piece as well. Just get something quality if you want it to last on the track. Nothing wrong with a t25, especially for stock motor.

You've got some kind of ems or something there, as that MAF is not what comes stock on the car. Whatever you have, ditch it for a megasquirt with IAT sensor.

Wheels are teh gay, you knew this.

What suspension is it running? That may need addressing for a track car. Car is obviously lowered, but with what struts/springs?

Nice radiator at least, that's good.
Fireindc is offline   Reply With Quote
Old 03-26-2013, 03:34 PM   #5
Senior Member
 
Join Date: Apr 2011
Location: Martin, Slovakia
Posts: 513
Total Cats: 71
Default

Adam I feel you pain. I recently changed out my cracked s4 manifold / downpipe elbow.
Attached Thumbnails
1994 1.8 Turbo - Critique & Advice?-p1030304_zps47065944.jpg  
sturovo is offline   Reply With Quote
Old 03-26-2013, 06:24 PM   #6
Junior Member
iTrader: (1)
 
Join Date: Apr 2010
Location: Saint Marys GA.
Posts: 136
Total Cats: 3
Default

What kind of EMS is on the car?
Lee04vr is offline   Reply With Quote
Old 03-26-2013, 06:29 PM   #7
Elite Member
iTrader: (2)
 
Join Date: Aug 2012
Location: Indianapolis
Posts: 3,325
Total Cats: 235
Default

Quote:
Originally Posted by Lee04vr
What kind of EMS is on the car?
Quote:
Originally Posted by Adz9 View Post
I am in talks with Dimitris to provide me with a MS2 to take care of the management side of things. I am decided on MS for sure after reading countless good reports on both here and MX5nutz.
Who cares what was on there before, it was failaids. MAF (pictured) = Stock ECU.
thenuge26 is offline   Reply With Quote
Old 03-26-2013, 07:50 PM   #8
Junior Member
 
Join Date: Mar 2013
Location: Houston
Posts: 113
Total Cats: -3
Default

Quote:
Originally Posted by stevenmiata View Post
Im not sure but for a track car I would use a turbo that spool a little bit faster to avoid lag.. maybe an expert could argue on that.

MS is the right way to go! im looking for one at the moment!

And your car looks pretty good!! i like the Tan soft top
Eh, I would think a bigger (laggier) turbo would stay cooler. He can use the transmission to stay in boost.
Fathom55 is offline   Reply With Quote
Old 03-27-2013, 07:37 AM   #9
Newb
Thread Starter
 
Join Date: Mar 2013
Location: Cardiff, UK
Posts: 21
Total Cats: 0
Default

The wheels have been ditched already! REALLY not my thing!

Suspension wise I will be getting coilovers. I have these sorted already, and know what I am doing re Miata suspension. Its on Tein springs with Bilstein shocks at the moment. Its just the actual turbo setup I have no real idea on!

EMS is a piggyback Dastek ECU but I will be ordering a Megasquirt.

What I really need to know is what to do with the actual setup. I agree with thenudge as well reagarding the downpipe probably being super pony Ebay shiz. It does have an aftermarket exhaust though which I would guess is 2". I will probably run with this for a while saving to upgrade it. I just want to get the actual turbo setup rock solid at the moment before anything else is upgraded.

I think I prefer the turbo being higher in the bay too so I think Ill look at getting it side mounted and getting a new downpipe as well as a priority, along with the Megasquirt.

What kind of BHP do you think I would be looking at from this T25 setup once running well on the 1.8?

Thanks for all your input guys!
Adz9 is offline   Reply With Quote
Old 03-27-2013, 07:39 AM   #10
Newb
Thread Starter
 
Join Date: Mar 2013
Location: Cardiff, UK
Posts: 21
Total Cats: 0
Default

Sturovo, what manifold is that you replaced the cracked one with? Is it a custom made jobbie?
Adz9 is offline   Reply With Quote
Old 03-27-2013, 05:05 PM   #11
Senior Member
 
Join Date: Apr 2011
Location: Martin, Slovakia
Posts: 513
Total Cats: 71
Default

Adam, I made that manifold. It is relatively easy to make but you would probably need to change the downpipe using that type. I am currently making a reversible S4 replacement that should fit in the same spot as your ebay manifold. Again easy to fab if you get the flanges cut somewhere.


should take 8 weld els and a couple of flanges


Attached Thumbnails
1994 1.8 Turbo - Critique & Advice?-p1030320_zps0dd45d80.jpg   1994 1.8 Turbo - Critique & Advice?-p1030322_zpsdef67888.jpg  

Last edited by sturovo; 03-28-2013 at 04:28 PM.
sturovo is offline   Reply With Quote
Old 03-28-2013, 07:42 AM   #12
Newb
Thread Starter
 
Join Date: Mar 2013
Location: Cardiff, UK
Posts: 21
Total Cats: 0
Default

Hey Sturovo!

That is some good work! I have been looking over on the MX5Nutz UK forum and there are a few guys on there that have also made there own manifolds, both of which have been running them for years now with no problems and are both pushing upwards of 200bhp, one of them 253bhp!

One of these guys has offered to make me a manifold from mild steel just like his, so I think this is what I will do as importing a BEGI or a FM to the UK is going to be very expensive, and if these homemade manifolds are lasting 4+ years pushing 250bhp that is good enough for me.

The thing I need to look at now is weather I want to sidemount or topmount the turbo, or leave it as it is like the S4 manifold. I am inclined to change it for a sidemount if the Rover 220 Garrett I have will mount in this way... What do you guys think?

Ad
Adz9 is offline   Reply With Quote
Old 03-28-2013, 07:42 AM   #13
Newb
Thread Starter
 
Join Date: Mar 2013
Location: Cardiff, UK
Posts: 21
Total Cats: 0
Default

Double post! :S

Last edited by Adz9; 03-28-2013 at 08:00 AM.
Adz9 is offline   Reply With Quote
Old 03-30-2013, 02:41 PM   #14
Newb
 
Join Date: Jul 2011
Posts: 1
Total Cats: 0
Default

hi fella im just getting the parts together to do my turbo build and im sorry to say it i have the same manifold lol
do you have a list of the items the car was turbo'd with?
so far ive got
t25
down pipe
manifold
fpr
mbc
both oil lines
oilfilter sandwich
boost gauge

looking into the intercooler at the min but i cannot afford to go ecu yet so thats why im asking lol

So It Begins!! - Forced Induction & N/A Power Mods - MX5Nutz Forum



little editing to say yey first post in 2 years
MattWho is offline   Reply With Quote
Old 04-02-2013, 05:56 PM   #15
Newb
Thread Starter
 
Join Date: Mar 2013
Location: Cardiff, UK
Posts: 21
Total Cats: 0
Default

I dont sorry mate!

I litterally have only just started going through what is actually on the car! I think I should have just bought a standard one and a seperate kit!

What kind of power do you think I will be making from a 1.8 with a T25 guys? I'm debating weather I should look for a T28....

I'd like 225bhp touch.
Adz9 is offline   Reply With Quote
Old 04-02-2013, 07:22 PM   #16
I take big bites
iTrader: (1)
 
turbofan's Avatar
 
Join Date: Sep 2010
Location: Hurricane, UT
Posts: 6,924
Total Cats: 526
Default

You can make 225 on a t25. Read some build threads, asthey will answer more questions you will surely have in the ffuture.
turbofan is offline   Reply With Quote
Old 04-02-2013, 07:40 PM   #17
Newb
Thread Starter
 
Join Date: Mar 2013
Location: Cardiff, UK
Posts: 21
Total Cats: 0
Default

Quote:
Originally Posted by turbofan View Post
You can make 225 on a t25. Read some build threads, asthey will answer more questions you will surely have in the ffuture.
I'll have a read through some now.

The TD04 is also an option as the manifold will be changed and the TD04 is really cheap and available here in the uk.
Adz9 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:04 PM.