thebubbadog

Can you do a port lets say a Bridge Port on an 2004 mazda rx-8 with out getting it tuned? or am i going to have to get it tuned for it to run?

I'm sure getting to tuned will add more power but do i NEED it tuned

9krpmrx8

iTrader: (46)

A Bridgeport is a waste of money but yes you would need a tune. Anytime you change the VE of the engine you should tune it.

9krpmrx8

iTrader: (46)

Yeah I mean the differences with a tune and without it on a street ported renny are negligible IMO so I would agree that you don't have to do a custom tune but to build one and then not get it tuned seemed pointless to me. I don't think the porting on my engine for example added any power versus had I just left the ports alone but I am boosted. But I left that up to Rob and I am happy with the results.

But, I have seen ported Renesis engines that did not idle all that well and so a slight bump in the idle speed had to be made to make it "normal". That is not really tuning but still some slight changes and some MAF scaling helps.

A Bridgeport runs like dog **** on a stock tune.

reddozen

iTrader: (1)

Idle and low end need to be tuned. I was running like 22:1 AFR before we started tuning.

thebubbadog

So i can get it ported but i would get big benefits for getting it tuned but its not a necessary. I'm also just going to go with a street port and forget the bridgeport. So then maybe it wouldn't be that big of a deal running it with out a tune. I like doing things my self so i'm probably going to buy this to do it https://www.mazdatrix.com/8racing.htm item number '49-22203' Street Port Template. I'm just trying to avoid dropping a lot of money on a tune for my car but i would still like to get it ported

9krpmrx8

iTrader: (46)

It makes no sense, there is only room for screwing up. If you are not going to spend the money to get a tune then forget about porting it.

9krpmrx8

iTrader: (46)

Yeah, I just don't think porting should be done by someone that is worried about the cost of a $200.00 tune. If he wants to experiment that is cool, but it doesn't seem like he can afford to do that.

Brettus

iTrader: (2)

Something else must have been going on !
Mine ran fine without any adjustments to the tune . Idle is less stable , but apart from that you wouldn't know it was there .
Same with the full length bridge on my first bridge engine.
Another full Bridgeport I tuned for a guy ran just fine before I touched it as well . He just wanted me to make it pulse ...lol

Wouldn't recommend a bridgeport on a turbo renesis to anyone BTW . It does nothing for power and makes spoolup worse.

reddozen

iTrader: (1)

No clue Brettus, but you're probably right. That was years and 80k miles ago. Renesis is coming out this summer anyway.

thebubbadog

If i can get a tune for $200.00 then that's no problem i just know nothing about tuning and i thought it was a lot more expensive. I live in NC and there's not a lot of tuning shops where i live so i guess i would have to take my car to Atalanta to get it tuned but even then i still don't know where to go to get it tuned for so cheep

200.mph

iTrader: (9)

i cant find the thread of the member whos "builder" bridgeported his renny with a drill press and stacked the motor on a 5 gallon bucket on the garage floor. any of you guys remember it?

9krpmrx8

iTrader: (46)

yeah it's the same guy who was revving it to 10k (had MM remove the limit) and said it was fine and then of course it failed and then later he rebuilt it and installed a PT 6266 (or something) and then disappeared. He claimed his builder built 400WHP 4 port autos, lol.

he was on the FB groups for a while too, he is so full of ****. he said it was fast because it would beat his Lexus GS,

Jedi54

iTrader: (7)

^^^ahhhhh, the good 'ol days.

04Green

iTrader: (1)

Just seeing this...

Answer, especially on an 04/05, is yes, get tuned. A ported engine will flow more air. There is a setting called Max Load that can get in the way. if you flow more air than Max Load expects, it figures the MAF is bad and will cap air flow data at that load point. This results in the engine leaning because more air is actually flowing. The worst spot is 6K to 6.5K RPM.

TeamRX8

iTrader: (25)

What you need is common sense and/or education because I'm sure you have ansolutely no clue other than a fantasy dream that can't be replicated in reality. Bridgeporting a Renesis is the same as taking a $6000 cash loan, digging a hole in the ground, putting the cash in the hole, pouring gasoline over the cash, and lighting it on fire.

There's a reason people talk anout how great their ported Renesis engine feels, but you never see anything to specifically back it up other than "zomg feelz" and the marketing schlock by the entity trying to sell it to you. Most of the ported Renesis engines I've seen make less or same power than a properly built non-ported engine and their durability is often reduced.

Best advice I can give is don't be thebubbadufus any more than you already have been by considering the idea ... just asking about it as you did here only proves how little you understand about the subject.

comebackqid

iTrader: (13)

What did they announce?

Dan Marcelino

I think you would be better off tuning your non ported engine rather than porting it and not tuning it.. I’ve had mine CNC ported and it ran a bit better with a stock tune, but once I tuned it, holy ****, feels like I have a turbo between 7000-9500

TeamRX8

iTrader: (25)

^^ the heart, deceptive above all, and exceedingly wicked; who can know it?


you’re deceived by perception, the reality is you got nothing meaningful output power wise.

Again, no such modification has ever been proven in real world reality to match or exceed a properly tuned and running stock port engine by more than a few measly hp, but generally the same or less.

Dan Marcelino

Well now I’m really confused.. lol, more flow = more power typically right? More air, more power.. right?

There was a significant increase after the porting.. it wasn’t a “maybe” placebo type thing.. it was very clear. Though, after tuning there were even more substantial increases in acceleration and torque. Very apparent. I have friends with tuned stock 8’s.. and though our configurations are different, I pull away pretty easily.

Brettus

iTrader: (2)

This is the problem here : no - one EVER does a comparison between a good stock engine and their ported engine . It's always "porting made such a difference" after the rebuild of a tired worn out engine. Of course it would ...so would a stock rebuild! It's the same story we used to hear over and over after people replaced dodgy oem coils with new aftermarket ones.

Dan Marcelino

See, that’s a GREAT point!! Could be what I’m feeling/seeing, but I still don’t understand why wouldn’t other intake and exhaust ports make more power?

i would love to see a proper apples to apples comparison! 👍🏼👍🏼

furansu

So much this!!!

A healthy, stock Renesis feels slow (no torque), but they accelerate quite well despite how they feel. Adding fuel to the fire, the vendors offering special porting always claim great numbers but don't show evidence of them.

I see little benefit to tuning a stock Renesis unless you really want to pump up the OMP, that's why I don't bother tuning them (yet), too few people actually building these cars, and when they do, they usually go with Haltech or Adaptronic, because they have a 13B-RE/REW going in with the turbo.

Brettus

iTrader: (2)

I've seen lots that were running richer than the wideband will measure .....those 8's really do benefit from a tune! Lots of others are just fine as is . Best thing to do is get a scan tool and check your AFRs . Anything in the 12-13 range (for the entire rev range) under wot is good.

furansu

That reminds me I need to run my AEM WB into the midpipe (de-cat) and check the factory WB for consistency/accuracy. The ND wideband was very accurate to the AEM, but it was also a new car versus the RX-8 I'm testing with, that is creeping on 100,000mi on the sensors (4,000 miles on the engine).

RotaryMachineRx

iTrader: (1)

My experience between AEM WB and the stock narrow band is about .3 afr difference at most with the stock narrow band typically reading slightly richer. Of course that's highly modified and not stock tune though. AEM is mounted about 18" further down the system in my BHR midpipe with the stock sensor in my downpipe.