po_snake

How much compressor flow is needed to reach 350whp? Here is a good link that has the compressor maps for the GTX3071R and the GT3076R Turbo Tech: Compressor and Turbine Map Details

WTBRotary!

iTrader: (6)

IMO giving a mileage suggestion of how long it will last doesn't do much. Im sure you can make 50-60K on 10psi if you never go WOT, and I'm sure you can make it last 5-10K miles with constant WOT. I would never go turbo unless I could reliably wind it out like NA. If I'm constantly worrying about it going Boom when I'm WOT under boost its not worth the worry.

It's great all the enthusiasm we have but I don't understand why people are continuing to boost the Renesis when its not designed for it. That exhaust port produces a lot of heat already, not to mention how hot it gets with boost. Doesn't make sense to go turbo on a Renesis unless your pockets are loaded and even then its not smart.

hoss -05

iTrader: (4)

^------ Once again I find myself disagreeing with you. There have been plenty of people that have lasted a long time boosted. Also plenty of cars that are none turbo from factory can take tons of boost. I think my engine should last longer than some may guess but only time will tell.

9krpmrx8

iTrader: (46)

My estimates are based on my driving style. And I hit WOT several times a day (especially in this weather, I am like a giddy teenager). I don't really worry about blowing an engine because I know it is going to happen sooner or later. And I highly doubt anyone who owns a a turbo RX-8 babies it when driving. Oh an it's kind of hard to get to 10psi driving like a puss.

WTBRotary!

iTrader: (6)

^^^ "Plenty of cars" being none that are rotary powered, and more specifically, not a Renesis.

Im glad you all took the plunge, but realize y'all are the Guinea pigs. Its great y'all boosted the Renesis, how long is it going to last at WOT? Whoopdee-do if y'all can turn it on and go on the highway with a few boost pulls. Get it on the track and lets see how long it will last. It needs to be able to take a beating for it to be worth the $$$ IMO. Obviously I know pure track use is different than street use but it needs to be able to take several 20 minute sessions without going Boom.

9krpmrx8

iTrader: (46)

Oh and as for why, well that comes down to a personal decision. Most of my non rotary loving car buddies don't understand why I even **** with an RX-8 at all, they just think it's silly to dump that amount of cash into a ticking time bomb when I could have a really fast Camaro, NSX, Mustang, Vette, etc.

But those same friends never understood why I dumped over 30k into my Civic and CRX either. I just like what I like I guess.

I think it's kind of weird that you don't understand why someone would spend money boosting a Renesis when you just paid $8,000.00+ for a rebuilt NA race engine.

yomomspimp06

wtbrotary,

your argument can be refuted by proper planning/setup/tuning.

yomomspimp06

whoa 8k+ on a rebuild....damn

9krpmrx8

iTrader: (46)

Who cares about the track? You don't track your car and neither do I. And plenty of people run boosted RX-8's on the track and plenty of NA track guys have been thru several engines as well. If you track your car, **** will fail. What fails and how often depends on many factors.

J8635621

iTrader: (10)

My mom is gonna buy me a new engine so I don't even care

WTBRotary!

iTrader: (6)

It wasn't $8K+

It's one thing to keep buying rebuilds to blow with boost, and it's another thing to buy a properly built rebuild by a guy who has been in the game for 40+ years. This engine is supposed to be the first and last engine I will need for this 8, might as well pay for the peace of mind that it's built perfectly...

The amount of money I spent was for the last engine I should need. I know y'all have spent over what I have for multiple engines + turbo accessories

I haven't been able to track it since it's been dead for over a year. I spent all that time saving up money for a new engine. Being a college student leaves me with virtually no funds, hence why my car has been dead for so long. Once this engine goes in I will be at the track...

Brettus

iTrader: (2)

There are a couple of big weaknesses with the Renesis under boost .

The stock apex seals WILL break quite easily under boost if there is any detonation .

The Exhaust ports will wear out under sustained boost if EGTs are not contained (IE track use)

There are other issues within the engine that occur but to date I have never seen these result in an engine failure.

If you manage to really wind it up (10psi +) there are a couple of other issues that will arise :

The front iron dowel hole is prone to cracking (high loads and a detonation)

The housings will flex and eventually cause water seal failure possibly other failure modes as well.


It has been a long road to get to where we are now with reliable tuning being possibly the biggest hurdle that had to be overcome before we could even start to push these engines.

To date we have been finding out the weaknesses and trying different remedies to overcome them .
It is only in recent times however that we are seeing lots of 'built for FI' engines out there so reliability is getting better and better .

pdxhak

iTrader: (2)

Reliability and longevity is relative to each owner and their wallet

9krpmrx8

iTrader: (46)

Should being the key word. Only time will tell if you made a great decision or not. Your engines longevity will depend a lot on you.

I have only paid for one engine and it was just under $4,000.00. That said, I probably have 10-13k in the current engine and turbo setup (not including bling and optional items) but that was with two pretty expensive **** ups on my part to the tune of $2,000.00 (having AMR and then Turdblown "upgrade" my turbo).

I also did a lot of stuff *** backwards and a large bit of money was wasted no doubt. But you live and learn and now I am able to use my experience to save a local, Hector Castillo a bunch of money on his Greddy turbo build.

But every day I drive her, I realize it was all worth it. Where I go next is to be determined but if my car stay the way it is, I will be more than pleased. Daily driven with 20k and counting.....

pdxhak

iTrader: (2)

Adding up how much you spent on mods will only lead to depression. Do not do it. Anytime I think about the money I take a drive on a few back roads to make the bad thoughts go away. WOT + boost = rotary bliss

9krpmrx8

iTrader: (46)

Exactly. I try not to think about what I have spent on/for my RX-8 in total. But I have not had a car payment in years so it balances out in my book.

pdxhak

iTrader: (2)

My 8 is paid off as well. I put less than 5k miles per year now that I take the train to work. Boosted toy's FTW

golde4u

when I was shopping for my 8 I also was looking at a c4s. the Porsche was almost 3x as much, but a boosted 8 gave the same power. the real problem was the Porsche's have a rear main seal problem, that equals 10k + for a used engine! If you want to equal the performance and feel of a boosted 8 with proper brake and suspension mods you will pay allot of money for it period. The maintenance alone on a high end car will break you. Oil changes on my Audi and Mercedes are $150, the brakes are $1500. Porsche is worse, and has no scheduled maintenance under $1500. Get the picture?

Posted From RX8Club.com Android App

ShellDude

iTrader: (12)

all this talk with zero results angers the rotary gods

TeamRX8

iTrader: (25)

doing nothing us better than F'ing up

Brettus

iTrader: (2)

Debatable .......................

TeamRX8

iTrader: (25)

only if you ignored the obvious