Wats the max HP people can push out of a 6 port n/a 13b? i kno u cant do much with a 6 port compared to a 4 port. but im curious as to how far u can push a 6 port so with out boosting it wat are the highest numbers u have heard of out of a n/a 6 port?

 

Actually, 6 ports will produce better power than 4 ports when NA.
As for power, you can get 160-165 to the wheels with a good street port. Put on a fuel controller and get it tuned and you are looking at 10-15 more than that. With a full standalone and a good tune you are looking at 180-190 to the wheels, and you can theoretically get even more than that with a really good port job and some luck.
All of this is assuming a fresh rebuild, straight-through exhaust, a cone filter with CAI, and s5 intake.

 

well thats great because im lookin to push 200 hp and ill be happy with that. just a street port bigger injectors and its out of a s5 so i already have the manifold and maybye a cold air intake. and i already have a Racing Beat full exhaust so i should be pushin 200 to the motor.. if im lucky

 

DO NOT use bigger injectors. That will hurt your performance even more. Even with a large streetport you can see gains by leaning out the fuel up top, and thats with the stock injectors. Once you get it ported, just break it in a drive it for a while. After a while you can get an S-AFC or similar and have someone who knows what they are doing tune it for you. That should get you your 200 at the flywheel.
I estimate mine had around 160 to the wheels and it was a ton of fun.

 

Don't mean to threadjack, but quick question. Sideways7 you seem to know a lot about N/As because I always notice you somewhwere in the million "how do I make my N/A faster threads" I was wondering if (already aked in another thread no answer and searched) you or anybody else knows how much power an N/As auto transmission can tolerate for daily use. I already have a RB header, bonez highflow cat, and corksport catback. I have plans for a CAI once it gets warmer outside and possibly an SAFC II. With these mods and a mild street port, do you think the stock auto transmission would be able to withstand the added power for daily use?

Dont mean to thread jack, thanks for any help

 

Bridgeport the 6th port irons

That is easy to make big hp

 

[QUOTE=That] "the stock auto transmission"

not bein a dick but u need to changed to 5speed. no auto rx7 is worth the time.

 

I honestly don't know how much the auto tranny can handle, but you should be fine with what you mentioned. You aren't going to have a huge boost in torque over stock, and torque is what kills trannys.

 

My first suggestion would be to swap out the tranny if you're going for more power, but so you know, Robbert from Rotaryshack had a turbo'd auto first gen, that I think he was in the 180 hp range if not more. I believe that it was also a T2 carbed bolted to it, with stock turbo.

 

so i shouldent put bigger injectors? the guy who is rebuilding my motor says that i can get good power with some 700 or 800 cc injectors to make up for all the air being adding to the motor.. in other words if i dont upgrade the injectors wouldent it run pretty lean?

 

stock n/a run VERY RICH.. so with the bridgeport u will still have plenty of fuel

Now I may be wrong but this is just "what I heard" if u go with the racing beat TURE dual exhaust that u can get up to 50hp's off just the exhaust when accompanied by a good intake...

again this is what I heard.. if it is not true someone please tell me so I know

 

Please do not jump on the 6 port auxiliary bridgeport bandwagon!

 

An auto transmission 'can' take more power than a manual transmission because the torque converter will act as a cushion in slipping - ceteris paribus. I believe Aaron has been putting out 225hp and not broken his NA manual transmission.

Torque converters (especially from the 80s) don't lend themselves to working great at high rpm though, which would be what any porting would help you go through.

 

I would say the FC auto is one of the weaker auto's I've ever seen. I would say hp numbers wise..... probably less than stock. Most of them die prematurely on stock, daily driven cars. And its typically not the torque converter that dies...the clutch plates, bands, etc.. all wear out WAY before anything else does. I've seen a couple auto's die in this way FAR before the stock engine does.

 

Probably not, and definately not.
First, you will probably need to add a bit of fuel if you bridge it since there is substantially more air being moved.
Second, the 56 HP gain is from a TURBO back on a turbo car. The gain is because it will produce more boost that stock, and thus much more HP.

have a large streetport with a ported exhaust, a cone air filter, and a straight though exhaust. I am running stock injectors with no fuel tuning and it still runs rich. There is no reason to ever run anything above 550's on an NA (excpet a P-Port) and even those are only needed on bridged engines.

Also, to add to what I said about the auto tranny's, they are really crappy and die to no reason anyway, but the added power shouldnt really make much difference on its life. I say plan on saving for a manual swap and keep going until the tranny dies.


To Rotarygod: What is wrong with aux bridging? I'm curious to hear your take on it.

 

The flow characteristics of an auxiliary bridgeport don't really lend themselves well to making power. You will get that loping idle and decreases economy and emissions but you aren't really getting a power increase. There has yet to be a single person that can show one making any more power than even a moderately streetported engine.

I could actually write pages and pages of valid reasons why it's not a good idea as well as guidelines to use such as no true dual exhausts with bridgports but I'm not going to get into it. There will be far too many responses crying because they disagree with facts and it'll turn into a flamefest that will result in no one learning anything and the dumbest advice coming out on top. It happens far too often. I'll save the effort and leave it at that. If you want me to give you some details and facts just PM me. Just please don't jump on the auxiliary bridgeport bandwagon.

 

wait.. so this "motor builder" of yours is telling you you need injectors that are capable of 325WHP on your n/a?

 

to original poster:

• (~25HP not lost?) Do a search on 5th and 6th ports and make sure yours are working, otherwise find another way to open them (air pump or electronic).
• (~7HP gained) Next get a cold air intake. Make sure all air is coming from outside, not from under your hood. Airtight seals are what's most important. Insulation (if any) is secondary.
• (~25HP gained?) Next get a street port.

Don't quote me on the numbers.

Based on my (highly fallible but still ballpark) numbers you'd be at 215bHP or 185wHP.
Next would come an SAFC 2 or a standalone ECU. Though those are less conservative measures.

 

I agree, 700/800cc injectors are insanely overkill.. the stock injectors are probably good for 250hp which is hard enough to get on an NA. I could see going to 550's on your secondaries MAYBE.... but... upgrading your fuel pump and FPR is probably a better idea to get more from the stock injectors. TII fpr and pump is a good swap.

 

You could probably go over 200 with a right port, ITBs and huge exhaust ports, but that's expensive.

Chris Ludwig got 174 out of a Stock port S5 and stock ECU. Don't ask me how it's his secret, but thats what he did (this was on his ITS car) . The extra 26 HP required to reach 200HP would be in porting probably, with some turbo exhaust sleeves and a good port on the exhaust you will gain a quite large amount of power over the stock diffuser bullcrap, I do believe. Thats even with stock intake ports probably.

 

I'd guess anyone could get an S5 to ~170 w/ stock port and ECU, using all the standard upgrades. 174 isn't too much of a stretch. No clue where the other 4HP would come from, though.

 

Are you absolutely 100% sure that a 6 port will produce better power than a 4 port NA?

In stock form, maybe; for everything else, I don't think so. Your HP numbers on a stand alone seems dead on; however I have not seen a NA 6 port engine in the 190hp range

 

170HP at the wheels, on a stock port and stock ecu?

Where? where?

 

Beat me too it.

If you are going to do a bridgeport NA, do it right and do a full bridge or half bridge.

If the car is turbocharged, then the aux bridge will make a huge difference as far as spool goes but you might as well just continue the bridge down and make a proper half bridge...A bridge is a bridge is a bridge as far as characteristics go...

 

325 WHP?!?! who said that!!? thats hard to get out of a turbo car let alone a n/a. no im not lookin to boost or bridge port im just lookin for a couple of easy ponies to add i needed to rebuild it eny way coolant seals went out. its still gunna be my dd so i dont need it too damn loud thats y i have my 85 first gen im goin all out on that one.. so it seams like stock injectors will work fine then ill just upgrade to a intake and ill be happy with wat ever the out come will be.. thanks for your help guys