CaliDrifter

iTrader: (1)

Thanks for the great write up, very well written. Curious to know your thoughts on the 3071R vs the stock Greddy turbo. I am not trying to bash but there is quite a price difference between the two. Would you say that it is necessary if you have the Greddy kit?

I recently purchased a Greddy kit, but haven't installed it yet. I'm getting other parts together(cold air upgrade, spark plugs, wideband, gauges, etc) so I can install everything at once. I've also been thinking about upgrading to a 3071R but not sure at this point if I should.

Any advice is appreciated

thekrieger

damn i want to go FI...if only i had the money...and it didnt void my extended warrenty

icey?

nice... bet you never had a problem in writing essays in english class lol

swoope

iTrader: (5)

nice write jason..

beers

tajabaho1

mysql + no turbo = fail.......I hate this thread, bye

mysql

You're going to have to try a lot harder if you call that bashing!

The 3071R is quite different from the mitsu turbo greddy kit ships with.

The greddy turbo is undersized, isn't water cooled, and uses oil to both lubricate and cool the journal bearings. The way the kit is shipped allows the oil pressure of the engine to push into the turbo. This causes premature wear on the journal bearings. This leaves us with an interesting dilemma. If you do nothing, the bearings will die. If you install an oil restrictor, the bearings get less oil and even though it's the proper amount of lubrication specified for the unit, the bearings also seem to die from lack of cooling. I had the restrictor and the turbo died within 12k miles. As the bearings wear, oil escapes and the car starts smoking like it's a fog machine at stop lights. It is also prone to having random surges where the turbo spools up more quickly than it usually does, causing it to feel inconsistent. This isn't a big deal, but it is present, so I thought I'd mention it.

By comparison, the 3071R is a custom turbo Jeff put together, it's not an off the shelf unit. So it has custom trims/wheels/etc designed for the RX-8. It's water cooled, and has real ball bearings. The turbo is physically bigger than the greddy, but it's size is deceiving. In a nutshell, it's basically a hybrid unit with T3 sizing but T4 sized flow. It has similar spool time to the GReddy, I have been able to get 12 psi at 2,800 rpm with a boost controller. Lag is non existent. Flow is consistent. There are no issues that I'm aware of.

It is the fastest spooling turbo that is also capable of pushing 400 whp. Given that most people are interested in the 300-380 whp range, and that going outside of that means much more expense, and much more risk, I maintain it's the perfect choice for the car.


So the upgrade from the greddy unit to the 3071R gives you the following:

- Higher flow, so you get lower charge temps (and thus less chance of detonation)
- Higher flow, so you get more power at the same PSI
- Consistent flow rates, so no surprises, and it's easier to handle.
- Real ball bearings, so you don't have to uninstall your turbo and manifold every year and pay to have the turbo rebuilt.
- Largest turbo that can fit in the manifold area. So you don't need to worry about upgrading it again later.

I'm likely forgetting some other important stuff, but I have to get ready for work

mysql

btw, I don't want to come across as a fanboy of the 3071R. I am being honest. If my car was totaled and had nothing recoverable and I wanted to go turbo again, I would not have any better options than the 3071R. Just like I would also pick the AccessPort if price was no limit and I could pick anything in the world for fuel management.

Having tried 4 different systems, it's also the best we have.

XDEEDUBBX

nice thread...you reminded me of how slow my car really is..the other day the wifey and I were following each other. She was in the FX35 and I was in my 8...We were trying to hop onto the freeway and I lost...wow the 8 is so slow... =(

elysium19

iTrader: (1)

I'm also curious.....anyone? Some sort of engine housing reinforcement?

playdoh43

can we see the latest graphs? peak whp numbers are great, but its the area under the curve that matters. I want to see what changes the FI kit has on the stock curve.

mysql

That's what this thread is for:

https://www.rx8club.com/showthread.php?t=132628

The only complaint I have with the graph is that some of the info listed there is beyond what the typical user will get. For example, most people get 270 whp / 210 torque from the greddy turbo. But it's a choice between showing what the max we've seen from each kit, or going with a random "medium" number that we can't quantify.

Also remember the kits are showing different PSI - so it's not an apples to apples comparison. Not that PSI can be directly compared since flow rates differ, and not every kit has been pushed to the limits.

What I'm getting at is that it's a guide, not an end-all-be-all chart.

Brettus

iTrader: (2)

how come your manifold cracked - could it be from the heavier turbo you put on it ?

mysql

Likely just a weakness of the metal when it was cast, exposed by extreme exhaust temps from the rotary engine. It's not a cheap part either. It's a $600-700 cast iron manifold.

By repairing the manifold (Clanton welding), then getting it ceramic coated (AllAmerica), the metal will not be under conditions as extreme.

Mazurfer

Nice write-ups Jason................thanks!

danielk015

iTrader: (1)

When did you first put on this turbo in terms of mileage, and how many miles did you drive on it? man i want one bad LOL

mysql

I had the greddy turbo kit installed when my vehicle had 32,000 miles.

The 3071R upgrade has been on the vehicle for ~2,000 miles.

I have ~52,000 miles on my car now.

MazdaManiac

iTrader: (3)

The manifold doesn't support the full weight of the turbo (though it is only a few ounces heavier than the Mitsu turbo the lit comes with).

mysql

size comparison, and my handy dandy chart (the run was done before i configured the boost controller, but every point on that torque graph is higher than what a stock rx-8 is capable of hitting)

swoope

iTrader: (5)

or you wife is fast!

beers

XDEEDUBBX

probably =( LOL