That looks pretty powerful.

Anybody have a dead Renny iron? I've got an idea!

B

 

Slower than or about equal to stock rx-8. I compared it to the corres78 guy on youtube, they are nearly the exact same acceleration.

 

lots of variables to form a performance comparison--so dont do that--i think he wanted to show that the engine was smooth through the rpm range?
olddragger

 

Yeah... I knew he wanted to do that. But I was kind of expecting the car to be a bit faster than stock. But then again there is barely 1500miles on the engine and had a dead battery before. BTW, Altitude can't affect this car this much can it?

 

To the OP,

Where you able to get any pictures of the porting?

I am interested in seeing just how small the bridge is and how thin the port must be. I was looking at a rotor/housing/plate here and it looks like everything would be tiny in order for the apex seal not to fall in the port.

Thanks in advance.

Chris

 

it's not like any porting is going to give you huge gains that will be that noticeable...especially in a youtube vid

only FI will give you that night and day comparison between stock, but I'm sure you know that

 

Altitude does actually effect the RX8 in a noticeable fashion. I do drives up to Prescott AZ where the elevation varies between 5,500 ft and 6,000 ft depending on where I am at. I normally have to stay very high in the RPM band to keep up with other more powerful cars on the mountain.

I nearly wrecked a few years ago trying to pass someone on a two lane road near Snowbowl outside of Flagstaff. I could have made the pass in Phoenix but with the elevation change I had to have lost between 10 and 30whp easy.

 

rotor scallop beveling can be two-fold issue though, opening the intake port sooner potentially also opens the exhaust port sooner

 

True but my current engine is ported about .1875" earlier opening on the exhaust port and boy does it like it. Remember, I am looking at this from the point of view of FI in which case earlier opening helps spool the turbo faster. It might not be the best for N/A though. I wouldn't mind trading the porting of the exhaust port for the scalloping of the rotor to see if there are significant changes in how the engine delivers power.

Chris

 

Hi

I didnt take pics, but will go to them again and get the one iron that was used for test marking and take pics, will take a while before there again,

on the video clip side, it might look slow, but i didnt show where it was done, i only showed the dash, firstly it was a bit of an uphil and secondly we are very high and not at sea level like most of you guys, we are close to 1800Meter above sea level, we loose approx 20% (according to the dyno guys)just due to that factor, then the ecu have to learn fuel trims all again as it reset all when my battery went, one cell died, it is winter here by us now!

i will do another run from first gear on straight line, but you wont see it so much on low speed, the power only makes differance which can really be seen a lot at higher speeds where needed.

i will try get a standard 8 and drive beside him or we do a "dice" and see

then when i have money again to take it for dyno with or a piggy back type system to fuel more or a 3rd party ecu like microtech for the fuel and ignition (am 100% sure we will get much more as we know it doesnt fuel optimum for power now at high rpm)

It just makes sense that at high rpm we will have to fuel much more than what the standard curves will allow, the ecu wont make it too lean, but other guys here in SA added more fuel (with piggyback system) from std and got more power, from mid to top,

to be honest i actually cant wait to actually do it, (just short on cash at moment)
any sponsors?

Philip

 

Hi

i didnt get pictures but i know that they did do test markings on a spare plate, i will get to them some time and try get the some pics,

i wanted to get while they were busy, and it took long, but when i went again to take, the motor was together already, but i did see the plates when it was done before put toghether,

if not i will trace the standard port and mark it on there as close as possible,

it wasnt that wide (port itself) due to the apex seal, the small piece, but it didnt go anywhere. but on other hand the bridge itself was also very narrow making some more space there as well

 

There is something else i must still do which will also add some power


I must change oil now after the run in, and of coarse going to use Royal Purple again, gearbox and motor needs to be done again, still has normal oil in since rebuild / porting

P

 

I had bad luck,


motor fine, but my Fuel pump went again, i only got approx 10000miles on the last one, and the tank was cleaned out perfectly before we did the change,

dont know if there is a other problem,

we are taking it out in morning and will asses then, we know there is a upgrade pump better than the mazda one, a Walbro which is available in kit for RX8, lots in SA went for them already.
Sounds that the new version 2009 is better,

Will let know by weekend

Philip

 

If you need infos about fuel pumps shoot me a pm, i might possibly be able to help you!

 

2009 fits and works great from what i hear...

 

Go ask Old Dragger about the 2009 Fuel pump, I think he was the one who installed it and loved it!

 

you should point out that it's not Plug & Play, it fits and works with a few modifications

 

To the OP (Philip_SA)

Any updates on those pictures that you were going to try and get of what you saw when your plates where ported?

How is the car driving so far?


Thanks.

Chris

 

http://bdc.cyberosity.com/v/EnginePorting/Renesis/

I need a guinea pig. Chickwafer Dave?

This bridgeport won't compromise the water jacket's square ring land, the side seal, or the apex seal. Overlap induced (using the stock exhaust port) is about ~20* after re-eyeballing it with it occurring from ~20*BBDC to BDC.

B

 

hmmmm - i'm needing some new irons ......

 

Great stuff Brian! I'm game

 

Great, Dave! We'll talk soon.

B

 

my question is how well will this hold up with FI?

 

Given my experience with turbo bridgeport Rx-7's over the past 6 years, I don't think it'll be an issue really. It'll change how it runs; that's for sure. The only concern I have, and it may not have much merit, is the exhaust port design on the Renny. It's only going to go so far.

B

 

Did you look at a bridge on the exhaust? Is it feasible?