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Turbo for the 2.3 6i

107159 Views 163 Replies 64 Participants Last post by  RiveraJ
7
This will be an evolving thread, but should provide enough info that we won't have a new thread every other day asking the same questions. Please bare in mind that the info provided is based solely on my experience and opinion. Please take the info i have and use it as you will, discuss the project with your local shop/tuner/dad/brother and move forward from there. Anyone with more info please feel free to give input, but i will be cleaning this thread up as it goes, so please don't bitch.



Q: What are my options for turbo'ing my 6i?

A: The options vary currenlty. there are 5 standard answers, most can be googled for more info
1) ]HiBoost (out of business, but used kits floating around)
2) F2 (never officially release, check with GP-Werks for more info)
3) HASS (via turbokits.com) (not produced, but at least 2 kits floating around)
4) built using Mazdaspeed6 parts
5) depending on where you are, a TRUST (Greddy) kit is available, though tuning has yet to work in the states, as well as fitment issues with LHD models.


Q: Do I need to build the engine? what boost can i run "safely"?

A: The stock block has been pretty good on about 8psi on pump gas. Anything more than that the bottom end should be addressed. solid tuning and race fuel can up that #, but people have popped engines above 8psi.


Q: What about the tranny, i have an ____ (insert MTX or ATX)?

A: both tansmissions will be fine.
1- The stock MTX has a tendancy to sheer 3rd gear at times (no specific power level, just some last and others don't)
2- Both 4 & 5spd ATX trans also work, though it's recommend to run 6psi on these setups. also, an additional trans cooler is essential as well for the atx.


Q: Can i make my own, i found a good kit on ebay?


A: sure, have fun, don't cry when it doesn't work right and cost more in the long run!


Q: How much can i expect to pay?

A: Quick answer is have $5k ready to spend, or don't think about it. Now, it depends on the kit obviously. F2's stage1 will be the lowest price KIT, and HASS ranges up to $4300 i believe. You can make your own Mazdaspeed'ish setup, but it is not a kit, so prices will vary and you'll need to find your own tuning solution. The install is amazingly easy in these cars, the install would range in the 5-8 hour range if you are looking at a shop. Most KITS will come with a tune to get you started, though it's recommended to to dyno tune your specific car, which is roughly a 2 hour job, though doesn't really need to be done ASAP.


Q: What else do i need to buy?

A: If it's a true kit, then nothing! There are items to make it better, make it last long and obviously make more power....but they aren't needed. Things i would recommend you have on our short list however, as they will aid with tuning and safety.
1- a WIDEBAND (no, the narrowband you saw on ebay won't work) Air/Fuel gauge, this is a must for tuning
2- spark plugs (i REALLY like the Autolite 103's, especially in the beginning while tuning. They are UBER cheap, and work well, easy to gap also)
.....that's it, for the long list i'd add:
3- oil temp OR pressure gauge (dont' see the need for both, and no your stock gauge doesn't do anything. this is only to see problems sooner, nothing else)
4- boost controller (DO NOT ADJUST BOOST!!) A boost controller will aid in how the boost comes on and levels off, feels much better. i suggest a manual controller in the engine bay that you CAN'T touch while driving)

.....There are other things, but they are not turbo related, they are performance related. (things like limited slips, clutch/fly, better rubber). you DO NOT need a turbo timer if you have any common sense, you can, but you are just spending money.





This is all the basic info on the setups that i could think of. For the most part, an 8psi intercooled kit on a STOCK 6i MTX in the 225whp range, the ATX (6psi) at just over 200whp. Power will be increased with an exhaust, which most have anyhow, but it's not needed to enjoy boosting.

notes for the ATX guys:

'03-'05 6i's with the 4spd have an off the shelf option to upgrade both their valvebodies and torque converter from Lentechautomatics.com, or whole tranny if you'd like. The valvbodies help out an amazing amount, and allow for a bit more boost if you want, the converter allows for a higher stall speed which is nice if you powerbrake often (the strip) and they can also remove the lock-up setup which can be a bitch when having fun on highway cruising.

'05+ 5spd ATX's have faster/tighter shifting out of the box, so that is a nice start. If valvebodies are something you want (as they can be improved quite a bit), Levelten.com has experience with them, though you need to remove yours and send it to them for the work.

Both models- please take a minute to understand how your ATX works, and then understand why i say you should always let your foot off the gas between WOT shifts. It is not something that will brake the tranny in one time, but please understand it's not recommended as the boost is still being applied while the tranny is trying to shift. Also, for the same reason, if you are cruising on the hwy while the converter is in lockup, DO NOT just slam it to the floor, it's not good for it either, a quick blip or downshift will safe a lot of trouble.


Now, i know of roughly 6 turbo'd 6i's that are (or have been) daily drivable, there are currently 4 on this forum actively i believe (as of 6/09). I would imagine all would attest that it's a friggin blast to drive, and the smile doesn't leave your face! The car is still pretty light at just over 3k, so the addition of 80-90WHP (about 60%) makes a huge difference in feel. But keep in mind that it costs roughly $5k on the low side for the setup, which is anywhere from 25-50% of what the car is worth, premium gas is required now, and it's hard to go back to stock if you think it's temporary. In the 4 years i've been turbo'd and talking to people about it, i've found that if your plan is more than 6 months (it's more like 3-4) out, then you won't get it. If you have 90% of the money in hand and are serious, go for it, but if not, there's not need for a billion questions that don't go anywhere, please just read what's on here already and enjoy the dream (it's cheaper!)

This link will always show you all the current topics for turbo's on the 6i's:

Turbo threads


here's a few vids that have been around forever, but if you are new you might like them.













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So I picked up the cx racing turbo kit and wanted to know for the exhaust the downpipe is 2.5 i was thinking of buying the magnaflow cat back but it is only 2.25 , would this be fine or do I have to get a custom exhaust set up and if so would you make it 3.0 just in case I decided to upgrade the manifold and down pipe or stick with the 2.5
from the down pipe is has a 2.5 opening here is some pictures
cxracing.com: 02-08 Turbo Intercooler kit Mazda6 2.3L Bolt on TD05-H
once i get all the pieces i will do just that , cant wait till i get it all installed
so cx racing cant come up with the turbo kit i ordered so I am back to square one . I am pretty sure that a mazdaspeed 6 manifold would fit but how about the downpipe
okay good to go i am thinking of going towards cpe , or if anybody can recomend another option
so if i wanted to take the cheap route for now to see how this project works out . I was thinking on getting the ebay downpipe and manifold I know it might not be top quality but dont want to spend 1500 to test things out. I am not sure if catted or catless will be the way to go . I live in florida so i dont have emissions to go threw . Maybe in the future i can bay a high flow cat and weld it on but wanted to get some info. I was looking at these so far they seem to look good but let me know what you think

Exhaust Racing Downpipe Down Pipe for Mazda 05-07 Mazdaspeed 6 MS6 Turbo 2.3L 06 | eBay

04 05 06 MAZDA3 2.0L 2.3L CAST TURBO MANIFOLD MAZDA 3 | eBay

here is a kit with the turbo
03 04 05-09 MAZDA 3 2.3L MZR T3/T4 TURBO MANIFOLD KIT | eBay
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