If you're going to pull magazine numbers to compare the heavier, Renesis powered RX-8 to a TII, why not use the same magazine - Car and Driver tested their '04 RX-8 at 5.9s to 60, 14.6@96mph in the 1/4 - which lays a bitch slapping on a stock TII. Maybe Edmonds had a green engine, or gentler/less skilled test driver, or both. But a stock RX-8 to a stock TII, the 8 is noticeably faster - in real life, its been my observation, and on paper. Which suggests that a Rene in a FC chassis should be significantly faster than even S5 TII's, given a NA FC should come in about 250-300lbs under the 8's weight. The Rene is only a 98lb weakling compared to the current 'Stang, 350/370Z, and so on, not to 20 year old 7s. Sure, a TII can make loads more power with mods - so can a Renesis, so that's neither here nor there, although modding the Rene probably is harder/more expensive.


http://www.caranddriver.com/reviews/...ormance_page_2

The real question here still is whether the OP has got the various port actuators and so on working, since it's likely the Rene won't breath well at high rpms without. I don't think that's been answered yet, unless I missed it going back through the thread.

 

sweet ride mate.. didnt know you could drop a Renesis in an FC
isnt that the rx8 engine?

 

Nick_d_TII, have you driven a bone stock all cats and full stock intake turbo2? i drove a modded one first.. and later on drove a bone stock one, it's pathetic, my 88 N/a was faster with just intake and exhaust!( drag times backing this claim) the stock turboII is not a fast car.

James_H, can you settle this by getting your car dyno'd? or at least take it to the drag strip?

 

I'm not the one who wrote a renesis powered FC would 'run circles around a Stock TII all day', and clearly, I disagree.

I'm saying it's close. Rx8 maybe a little faster and a Rene in a FC might be a little faster yet, but to say it would 'Run Circles' is BS.

I REALLY just wanted to know what the OP thought of the engine and his take on how the Rene effected his FC's performance, but some others here feel the need to 'chime' in and act like they know everything and make claims w/o any credible links or information to back it up (rx7racerca, thanks for link and comment)

Have fun!

 

As much as this can all be argued about performance, I would put a Rene in an FC if I thought it was at all possible. That would be a awsome daily driver. I am very curious about if all the ports in this car are working.

Video of it driving please!!!!

 

I wonder how it turned into a debate on what's faster... a Turbo II or RX8.

I know for sure a Renesis FC would blow the doors off of a Turbo II FC (S5 even). I'm sure the RX-8 would've been more tuner-friendly if they ditched the longer frame/weight/useless features/ rear seats.

 

Seriously! Put the Rene in the Miata chassis, improve the styling, add a low boost turbo and you have the RX7 of tomorrow.

 

its been done already.


a stock renesis engine will produce more usable power all day than a t2 will.

 

then a stock T2 will you mean

 

I thought this was someone's build thread but I guess it turned into a more important debate of what everyone thinks about a couple different engines Can a mod remove all the crap so we can continue with the build that I wanted to see?

 

^^^^^
agreed

 

yeah everyone shut the **** up already and let the guy enjoy some props for doing something that nobody here has really done and well documented yet.

Kit looks fine, for what the wing is it looks alright, if one had to choose such a wing. Just really need to do something with those signals. I also understand your suspension issue as you need to daily drive it. I guarantee your car looks leaps and bounds better than most peeps cars on this board and you have a very unique swap.

Yes that car will run circles around a stock t2, if the ports actuate fine. Per the amount of effort and ease of modifying a t2, a simply modded t2 would probably spank that car, but that Rene car will weigh less and more to the core of what an rx7 should be about. Lightweight, rotary, quick.

Great swap, good build.

AND please for the love of God post some technical info such as how you are doing your ports and everything else.

 

Nice conversion James. I must admit I haven't seen your car around up to now. I am just up the A3 near Waterlooville.

 

well I say wait for the guy to post specs/numbers/info/etc so everyone has something to base their theories on. we don't know how the engines aux systems work yet (i.e. the ports being wired open,not working properly,how they have it wired,etc). everyone is just firing randomly into the dark thinking it works EXACTLY the same way in the FC as it does in the rx8. Easy solution is to have the OP bring it to a dyno or, more likely, a drag track and calculate his best trap times.

EDIT: missed the last page! James, contact the mod for this section and ask them to clean the thread up for you. this is getting really ridiculous.

PEOPLE, imo if you want to have an engine discussion like this then start a thread or do it through pms.

 

Wow, this debate over what is faster an RX-8 engine or a TII engine in a FC...is about as retarded as James's wing on that car!

Jack the car up and take a picture of the sub frame.

 

^lol@sig. On demand smoke system.

Yes please more engine pics and some more of that "how did you do that?"

 

James, it is cruel and unusual to play coy with the technical details.
So far we know much more about the body- the least interesting and most subjective aspect of the project- than the real meat and potatoes.

I'm particularly intrigued by the stock radiator.
It's rare to see one even in a mostly stock houptie, much less a built/swapped project car.
No judgement implied either way, it just indicates a potentially interesting approach to the rest of the execution.

 

so... any updates or what?

 

He prob doesent know any tech details! REWorx did the conversion

 

a debate on what engine would be better isnt entirely a bad thing. it would be more effective if we had some hard facts to compare. or a test run (take his car and a modded t2, take them out for a stig spin and see what happens) or at least have some one put up some dyno charts. he can say it does 300whp all day but is it true.. lol

im just saying. im new to all this but its soooo much fun watching you vets spit out opinions

 

I was suprised by RG'S states myself?????? The engine with the most power under the curve will always have the power advantage. Gearing is the next thing (and most forgotten). I haven't seen a stock S5 Turbo II dyno but, I wouldn't be suprised that the S5 turbo II engine made more power under the curve till the upper rpm's (when the renesis takes over). We also can't forget the rx8 has a better geared transmission to take advantage of it's power curve.

 

This is only coming from my prefrence and my expereince in dealing with both the NA fc motor and the Renesis motor. I deal with both at my job ( Mazda Tech at a local dealership) and to be dead honest with you. The renesis is a much more simple engine to work with then with the million issues that the old 13b's carry. Personally i'd swap powerplants on that basic fact alone.

The renesis is bound to be lighter due to the changes in intake design dropping at least 30 pounds from the engine.

The updated ignition system makes for a much easier car to diagnose. I normally see small failures lead to bigger failures such as a dead coil or fouled out sparkplugs. Also the cost of those ignition coils from the dealer are about 100 dollars. ( Get a discount of course. lol)

Vacuum lines. I won't go there. I believe the renesis has about 4 vacuum lines and three solenoids that work the intake runners.

The signifigantly improved oil lubrication systems of the later rx-8's (2009- 2010) seem to nearly zero out any flooding issues. I have not seen one 09 or 2010 in for anything more than oil changes.

The higher redline and increased power. Enough said. Yes, a TII may have more potential at the beginning, but I just don't want to deal with a turbo rotary.

Keep in mind, i'm not hating on the rx-7's by anymeans. I miss the old stylings of cars like the SA,FB, FC and FD and kind of annoyed how car companies are appealing less to overall style and more towards aerodynamics and fuel economy.

Once again this was all my opinion based on several facts that I have experince in. I haven't dealt much with Turbo 2's but I know enough to know I wouldn't want the headache. I'm sure the cost of swapping a renesis into my Fc would probably be pretty high, though I still think i'd be very happy with it once it was all said and done.

 

I don't see how even a single one of you can act surprised at that statement at all unless you believe the TII to somehow be superior to what it was or the RX-8 to be less than what it is. Both are most likely true. Neither are absolute rockets.

Your quote nails the powerband question perfectly. A stock TII engine will definitely make more power than a Renesis up to a certain point. However if that point is below the usable rpm range that you'll be in for maximum acceleration, what good is it? Clearly the Renesis would be at a higher power level within the usable powerband. Yes the RX-8 does have an extra gear. However it is so close ratio that having an extra one is practically worthless. If a Renesis were in an RX-7 using the same gearing, the Renesis engine still makes more power higher up where you'll be shifting. That means it will be faster. Power under the curve is what matters but within the usable powerband. Just because engine A makes more power than engine B below 3000 rpm doesn't mean anything if the rpm range you are going to be in starts at 5000.

 

LOLtarygod.

Just because an engine doesn't make more power, it can be faster, because the power is above 5000rpm or is it because an engine makes less power it can be faster because the power is below 3000rpm. OR is it faster because, it has an engine that has more power is faster because it's faster?

Figure that **** out...

Where 'o' Where is the OP of this thread? This BS shall be declared dead; until the OP posts specs, in regards to the performance of his rx.

 

Personally i'd to see how they made a speedo work in that car along with Power steering if he is intending to run it.