porting ?

Any form of normally aspirated power mods.
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porting ?

Post by Gumball89 » Fri Nov 14, 2014 6:35 am

So whos done whst when it comes to porting ect ?
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Re: porting ?

Post by AdamGaltress » Fri Nov 14, 2014 8:08 am

Ports are ground out to make them larger, thus letting more air in and out of the engine for more power
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Re: porting ?

Post by kopite72 » Fri Nov 14, 2014 9:22 am

alot of guys have had ports done on the rebuilds,mostly street ports i assume?I dont know of anyone who's had a bridge port done on an 8 tho im sure there must be someone on here who's had it done.Gives that awesome " brap brap " that sounds ultra cool.Heard it up close and in the flesh on a 7 but never on an 8
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Re: porting ?

Post by AdamGaltress » Fri Nov 14, 2014 9:49 am

I've been told that it's incredibly hard to bridge an RX8 engine, I believe it's because of the proximity of cooling jackets, I think there's a half bridge and I might have read somewhere that a full bridge is being developed still
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Re: porting ?

Post by Will66 » Fri Nov 14, 2014 12:01 pm

Bridge ports on an 8 don't really brap like they do on an older rotary, also they don't tend to last a long time for some reason, probably related to side seals although I am not certain. The "brap" noise comes comes from a lot of overlap between intake and exhaust port timing which is very hard to achieve on a Renesis.
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Re: porting ?

Post by Phil Bate » Fri Nov 14, 2014 12:32 pm

:whathesaid: You need peripheral ports for brappage
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Re: porting ?

Post by Bulldog » Fri Nov 14, 2014 12:40 pm

I am going to try again with a bridged renny. After three failed attempts I think the time is right to have another go. big pete has got a half bridged engine that works well.
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Re: porting ?

Post by V8 Power » Fri Nov 14, 2014 5:55 pm

I have just had my Rex back from Haywards with a rebuild including a street and bridge port.
The bridge port is only on the tertiary port.

Still running in but even with a 4k Rev limit there is still much more urge low down from the street port. The bridge doesn't come into play until 7k so will have to wate and see.

So far so good lovely and smooth!
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Re: porting ?

Post by kopite72 » Fri Nov 14, 2014 6:02 pm

sweet,amy chance of getting a vid up on here? whats she like when idiling? much difference to a stock 8?
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Re: porting ?

Post by DanBass » Fri Nov 14, 2014 6:13 pm

The tertiary ports are closed till 7k so likely not.
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Re: porting ?

Post by kopite72 » Fri Nov 14, 2014 6:26 pm

Fair enough Dan just thought there might have been an inkling of brappage but appearantly not
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Re: porting ?

Post by V8 Power » Fri Nov 14, 2014 6:37 pm

No brappage and tick over is as normal.
Carl Hayward reckons this type of porting is the best solution in that you get low down and high end gains. No compromises. He knows as he has tried full bridge and just about every other combination.

Will vid once run in.
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Re: porting ?

Post by kopite72 » Fri Nov 14, 2014 6:39 pm

must feel great to drive knowing you have so much more power than a stock 8 on tap
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Re: porting ?

Post by Will66 » Fri Nov 14, 2014 6:53 pm

Take out the MAF screens and let it idle, it sounds like an old school bridgeport then. It also messes up your idle and your LTFT goes all over the place. It's not a great idea.
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Re: porting ?

Post by Soul » Fri Nov 14, 2014 7:21 pm

V8 Power wrote:I have just had my Rex back from Haywards with a rebuild including a street and bridge port.
The bridge port is only on the tertiary port.

Still running in but even with a 4k Rev limit there is still much more urge low down from the street port. The bridge doesn't come into play until 7k so will have to wate and see.

So far so good lovely and smooth!
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Re: porting ?

Post by V8 Power » Fri Nov 14, 2014 7:44 pm

Haven't got a clue how much extra power and no claims were made.
Once it is next on track I will have some idea how much improvement has been made.

For the little extra cost must be worth doing if having a rebuild.

Had a new clutch and lightened flywheel fitted at the same time.
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Re: porting ?

Post by Flameshades » Fri Nov 14, 2014 8:11 pm

the difference you are seeing i would think is from the LWFW, makes the car pick up lots better,

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Re: porting ?

Post by Bulldog » Fri Nov 14, 2014 8:11 pm

I love the light flywheel mod .. like its my second fav mod
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Re: porting ?

Post by AdamGaltress » Fri Nov 14, 2014 8:15 pm

What's the first?
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Re: porting ?

Post by Bulldog » Fri Nov 14, 2014 8:19 pm

HKS Legamax - its the only non negotiable mod for me :)
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Re: porting ?

Post by GreySilver Beast » Fri Nov 14, 2014 10:41 pm

So has RX-8 Auto's ever been Ported :?: and if so what sort of power increase would you expect :?:
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Re: porting ?

Post by Will66 » Fri Nov 14, 2014 10:47 pm

You'd get the same as the manual would. Aston's ported 4 port dynoed above stock without a tune for it to benefit from further. I think he's planning to get power figures from it before making with the turbo. However he runs a higher rev limit than stock which you wouldn't be able to do with an Auto as the transmission's pump and torque converter wouldn't cope and you'd kill the transmission very quickly.
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Re: porting ?

Post by GreySilver Beast » Fri Nov 14, 2014 10:49 pm

Thanks Will =D>

Exploring all sorts of idea's at the moment :P
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Re: porting ?

Post by Pitbull » Sat Nov 15, 2014 5:21 pm

Just wanted to say. Had the same mods and rebuild as V8 power @ Haywards earlier this year. All run in nicely, tho yet to track it. Had street and bridge port, lighter flywheel, clutch, coils, racing manifold.
Bottom end much better, top 2.5k amazing difference. Breathes easier, like its on menthol Tunes. Pickup all thru the rev range just feels smoother, and much more responsive. Now i love it even more.
Tried a comparison with others on a local meet, we were 3-up and a full tank and boot, and i had to keep lifting off up hill, when everybody opened up on a nice stretch of road allowed.
Personally always fancied supercharging, but im really happy with the improvements that Carl and the crew @ Haywards Rotary, have made.


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Re: porting ?

Post by cib24 » Sun Nov 16, 2014 7:27 pm

V8 Power wrote:I have just had my Rex back from Haywards with a rebuild including a street and bridge port.
The bridge port is only on the tertiary port.

Still running in but even with a 4k Rev limit there is still much more urge low down from the street port. The bridge doesn't come into play until 7k so will have to wate and see.

So far so good lovely and smooth!
I have this exact porting done on my motor built by Hayward Rotary. I have about 4,600 miles on the rebuild and have tracked it three times since September. The ports have been enlarged beyond the Racing Beat template that is typical for most other street ports and the tertiary port is bridged to provide stronger top end pull. The car doesn't brap and sounds and drives like a stock Renesis, but it has a much stronger mid range and top end when putting the pedal to the floor. There have also been no compromises in drive-ability or mpg, even with my lightened flywheel. The engine seems to get stronger with miles and if you read the post I made on the RX-8 Discussion board the other day, you will see how much quicker it appears to be compared to non-ported RX-8's out on the track:

http://www.rx8ownersclub.co.uk/forum/vi ... =6&t=61684

The final performance mod I'm waiting on is the Racing Beat cat-back since Carl has told me that I am holding back the top end by keeping the stock cat-back exhaust on the car (not my fault that it is taking forever to get a Racing Beat shipped over here). I'm not sure how much additional power my car is making compared to a stock Renesis but what I do know is that at Oulton Park on Wednesday I was able to keep up with a modified Honda S2000 which on average makes an additional 20-30 whp more on a dyno than a stock Renesis and is 300 lbs lighter than the RX-8.

I remember seeing V8 Power's car at Hayward Rotary when I was there at the end of October for my MOT. He has built a pretty serious race car with absolutely no interior and what seemed to be plexiglass windows. I'm sure the weight savings he has made compared to my full fat car will ensure his car is quicker than mine out on track. All V8 Power needs to do now is order all of the carbon door, boot, hood, etc. parts to get even more weight out!
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