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Hey guys. I'm terribly sorry if this is the wrong section, but I had a question about using a turbo on the 8 that I can't seem to find clarification on in the FAQs or anywhere in the forum (yes I've tried the search function and google).
At some point in a thread I was browsing about turbos, it was mentioned that "if you think you'll be getting up to the stock 8-9k rpms, you're delusional."
What's the deal there? Is this true? Is it just not safe to take your engine up that high with the turbo pressure even dialed in low?
Use small words, please, because this is really my first foray into car modification. (And this is the first car that I've owned with more than 200hp).
Edit: To clarify, I'm not planning this as my first mod. Just want to get to understand it better before I make any other changes.
Last edited by hamberglar; Oct 4, 2013 at 06:22 PM.
The turbo is a compressor with a narrower operating range than the engine is capable of. Technology is improving with the times, but without a variable vane turbo like the Porsches have you are either trading lag for top end, or trading top end boost for a faster spool.
The turbo is a compressor with a narrower operating range than the engine is capable of. Technology is improving with the times, but without a variable vane turbo like the Porsches have you are either trading lag for top end, or trading top end boost for a faster spool.
(Just trying to understand since I'm new at this)
What you're saying is that my revs will still make it up to the 8.5k (or whatever), but the turbo is either not going to spool up until the higher revs, or it's going to spool relatively quickly but not be effective at the higher revs?
Think of it as a straw vs a garden hose. A straw makes fast moving air with just a breath but wont flow as much as a hose. However, the hose won't allow air to move very fast with just a breath.
Think of it as a straw vs a garden hose. A straw makes fast moving air with just a breath but wont flow as much as a hose. However, the hose won't allow air to move very fast with just a breath.
at myanmar techinican said that after installation of turbo on rx8 the rotary engine will dead. Why this is happen? how can we avoid from damaging engine after installation of turbo on rx8? One thing left they install universal turbo
Any major power adder will reduce the longevity of any engine. How a turbo affects the longevity of your engine depends on many, many things. Your technician is not qualified to install any turbo if he is considering a universal kit. And in the future, read before posting randomly in an unrelated thread.
Not sure if this the right thread for this question but I am wondering what a used turbo kit goes for, for the rx8. I have taken mine off and am looking to sell the thing and would like to know how much is a reasonable price to ask. if anyone knows or could point me in the right direction thatd be cool.
If it is a basic Greddy kit without upgrades or fixes I would about $1500.00, $2,000.00 tops. Assuming the manifold has no cracks and the turbo is rebuildable.
2. What additional items will you need? A Diverter Valve is recommended on a MAF setup like ours, and a recirculated blow off valve will do, but you will need to purchase the recirculation hose fitting separately in most cases, and the Greddy compressor inlet pipe will need to have a fitting welded to it to accommodate the recirculation hose. An Electronic Boost Controller, a proper cold air intake (see mine), Cobb Accessport and Access Tuner Race software, Adaptronic Select PNP ECU, or the Mazdaedit software and Tactrix 2.0 Flash tool. High temp silicone (with a thermal sleeve over it) turbo oil drain hose with a proper hose fitting and a proper male fitting welded to the stock oil pan. A quality aftermarket Wideband O2 solution, boost gauge, fuel pressure gauge, quality heat shielding material for the passenger side firewall/trans tunnel opening, and all new quality fasteners for mounting the Turbo, compressor inlet/outlet pipes, the manifold, and the downpipe.
3. What additional items are nice to have? Additional gauges or means of viewing critical engine data live, a proper oil pressure regulator for the turbo oil feed, upgraded BHR ignition kit (or make your own if you dare), oil filter adapter plate with 1/8” NPT ports for gauge sending units and turbo oil supply, Racing Beat air pump block off plate (means deleting your air pump and likely not legal depending where you live), upgraded fuel pump/assembly, high quality silicone pipe couplers, quality T-bolt clamps, and quality vacuum hose (not just any silicone or rubber hose, vacuum hose)
5. What software and hardware do you need to use to load/tune maps? Cobb Accessport and Cobb Access Tuner Race software, Adaptronic Select PNP ECU with laptop, or Mazdaedit Software and Tactrix 2.0 flash tool.
6. What are the different maps available? What do they do and how were they changed from previous versions? You will need to learn how to tune and use the listed hardware and software or you will need to pay someone who is qualified to do it. My opinion is to not waste your time and pay someone to do it right the first time. There are no one size fits all maps.
7. What's a typical install time? Days, Typical install time is around 10-12 hours. It may be possible to do it faster or it may take longer, it all depends on your skill, and proper, prior, planning.
8. What are typical installation labor rates? Typically between $1000.00-$2,000.00. But that is just a wild guess and that price will vary greatly depending on where you are and how crazy you are going with your setup.
9. What else should I know about this kit or turbos in general? I recommend reading as many build threads and Greddy turbo related threads as you can. I also recommend you read this book.
10. What type of turbo does the kit use? An 18G Greddy T618Z GReddy
11. How much boost does it provide? On the waste gate, the standard unmodified Greddy kit boost level is typically between 5-6psi. With an electronic boost controller and a proper tune, 8PSI-10PSI has been done but only up to about 6000RPM (Brettus Edit). With an upgraded turbo, bigger injectors, etc. more boost can be ran and more power made but it depends on the quality of the build and the quality of the tune.
12. Will my gas mileage be effected by the turbo? Yes. Typically since a turbo is a restriction in the exhaust, you will lose a little efficiency. And boost is addicting, mileage will suck.
13. How much HP can be made with the Greddy turbo kit? With a solid engine running properly, on the standard kit with a solid tune, about 250-260WHP (Brettus edit). With an upgraded turbo and other upgrades it will vary depending on many things, but about 300WHP can be expected. Above that has been done but is still uncharted territory with any expectation of even decent reliability.
14. Will adding a turbo affect the long term reliability of the car? Yes it will. If you plan on turbocharging your RX-8 for any extended period of time, then you should plan on paying for an engine rebuild at some point.
15. Do I need to build up the internals of the engine to handle the boost? It is not necessarily needed on a standard Greddy kit. With an upgraded turbo I would say it is recommended if you want some reliability. There are many opinions about engine building and if you ask five different engine builders you will likely get five very different opinions. So if you are looking for an engine to be rebuilt then I suggest educating yourself first and then talk to as many builders as you can before picking one.
16. What octane fuel is recommended with forced induction? The highest available to you at the pump.
17. Can I use a high flow cat or straight pipe with forced induction? Yes you can. But if you choose to run a cat converter, spend the money the first time for a quality cat (HSJ, etc)
18. Will forced induction void my vehicle's factory warranty? YES
19. How fast can a Greddy RX-8 do a 1/4 mile?
It varies but mid to low 13's should be attainable if the car is setup right. This is a buddy who ran a 13.1 @107MPH with a BNR upgraded turbo at 10psi on drag radials but with a less than ideal tuning solution.
Couple of things:
on the stock turbo :
270whp is a stretch . 8-10psi is doable but only up to around 6000rpm
Install time : didn't yours take about 3 years ? heh
Couple of things:
on the stock turbo :
270whp is a stretch . 8-10psi is doable but only up to around 6000rpm
Install time : didn't yours take about 3 years ? heh
Thanks! Edited. And yes installing a kit and finishing it are two different things. Well, for me at least, .
Quick question. Do you have to weld a bung into the Greddy down pipe for the O2 sensor or does it already come with the bung? I know some guys run an O2 up front and then another towards the rear. Is that necessary? Thanks.
The factory primary O2 goes in the Greddy downpipe, there is a bung. You can either remove the factory rear O2 and install your aftermarket wideband O2 in that location (what I did) or have a bung welded into the midpipe for the aftermarket wideband O2.
The factory primary O2 goes in the Greddy downpipe, there is a bung. You can either remove the factory rear O2 and install your aftermarket wideband O2 in that location (what I did) or have a bung welded into the midpipe for the aftermarket wideband O2.
Used greddy turbo street market value
Typical install time is around 10-12 hours. It may be possible to do it faster or it may take longer, it all depends on your skill, and proper, prior, planning.
