NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   Rotary Engine Building, Porting & Swaps (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/)
-   -   Porting How Much Of A Power Increase? (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/porting-how-much-power-increase-24224/)

FrostRacing 09-07-2003 10:31 AM

I was just wondering how much of a power increase you get from each type of port?

https://www.nopistons.com/forums/pub...1047683621.gif i am having my engine (88 se 13b) rebuit i have 2mm atkins aviation seals with a bridge port how much boost could i run with out blowing my engine if it is tuned right?

jspecracer7 09-07-2003 11:43 AM

how much power? well, your bridgeport will net you tons of power top end, and some loss down low.



How much boost? depends on your fuel system.

RotaryRocket219 09-07-2003 12:38 PM


Originally Posted by FrostRacing' date='Sep 7 2003, 07:31 AM
I was just wondering how much of a power increase you get from each type of port?

https://www.nopistons.com/forums/pub...1047683621.gif i am having my engine (88 se 13b) rebuit i have 2mm atkins aviation seals with a bridge port how much boost could i run with out blowing my engine if it is tuned right?

Is it a n/a 6 port engine? Just curious b/c you said it was a 13B out of a SE...

FrostRacing 09-07-2003 12:55 PM

yes it is a n/a 6 port. so i will have alot of top end how much of a hp difference do you think there is?i am thinking of going with 550's & 1600 255 pump with a af meter and s-afc

as for low end you think it would be a good idea to run nitrous to pull of the line just before the turbo kicks in?

FrostRacing 09-07-2003 12:57 PM

o yea the turbo i am referring to is the t3/t4 i will be adding soon

dr0x 09-07-2003 03:10 PM

I think you need to build the motor and get it tuned with just the turbo before you even mention nitrous..

RotaryRocket219 09-07-2003 04:22 PM


Originally Posted by FrostRacing' date='Sep 7 2003, 09:55 AM
yes it is a n/a 6 port. so i will have alot of top end how much of a hp difference do you think there is?i am thinking of going with 550's & 1600 255 pump with a af meter and s-afc

as for low end you think it would be a good idea to run nitrous to pull of the line just before the turbo kicks in?

Why not save for a EMS? Be alot safer and not that much more than piggyback crap and other things you'll get. Find a used E6k or a Microtech lt8 or something.

FrostRacing 09-07-2003 07:14 PM

yea i think that would be a better idea i just am not all that great with wiring and tuning who would i need to talk to if i get stuck? so while im waiting how much boost could the stock fuel system hold and when i get the ems how well would the internals hold up?

IGY 09-07-2003 07:34 PM


Originally Posted by FrostRacing' date='Sep 8 2003, 02:57 AM
o yea the turbo i am referring to is the t3/t4 i will be adding soon

So you are gonna run 2 of those right? If you plan on running that HONDA turbo on a bridge port, all you are going to accomplish is making a little breep breep noise and a slow car. That turbo is way to small for a rotary much less a bridge.

FrostRacing 09-07-2003 08:09 PM


Originally Posted by IGY' date='Sep 7 2003, 04:34 PM
all you are going to accomplish is making a little breep breep noise and a slow car.

https://www.nopistons.com/forums/pub...1047683785.gif IGY i want to go with the t3/t4 because of the price what would be a nice size turbo for under $600

rx2boy 09-08-2003 11:50 PM

I just got my motor back from maz-sprint in Brisbane, a 13b race bridge port with all the good stuff.211.6 bhp is realy good for a B port so if you want a kick ass motor give them a buzz https://www.nopistons.com/forums/pub...1047683473.gif https://www.nopistons.com/forums/pub...DIR#>/cool.png

IGY 09-09-2003 03:27 AM


Originally Posted by FrostRacing' date='Sep 8 2003, 10:09 AM
https://www.nopistons.com/forums/pub...1047683785.gif IGY i want to go with the t3/t4 because of the price what would be a nice size turbo for under $600

The minimum I would go on the exhaust side on a bridge ported motor would be a P trim wheel with AR 1.00 housing (1.15 is better). CHEAPTURBO.com has a TO4S for $725.

FrostRacing 09-09-2003 07:24 AM

rx2boy i have already found some one to do the porting and and those are some nice numbers what all do you have done? IGY you seem to know your **** i was told that the way my motor is built (just a normal rebuild) i could not run over 12psi i dont know why if i have it tuned correctly. what all comes into play when pushing for high(over 375) hp engine wise?

jspecracer7 09-09-2003 10:01 AM


Originally Posted by FrostRacing' date='Sep 9 2003, 09:24 PM
rx2boy i have already found some one to do the porting and and those are some nice numbers what all do you have done? IGY you seem to know your **** i was told that the way my motor is built (just a normal rebuild) i could not run over 12psi i dont know why if i have it tuned correctly. what all comes into play when pushing for high(over 375) hp engine wise?

How much boost you want to run is related to how much FUEL you have...not necessarily the engine. Of course, tuning and timing are important as well.

IGY 09-09-2003 10:17 AM

TO4S, stock FD motor, 15psi, 550/1680injs, there are people seeing 400rwhp. Good side port, 15psi, TO4S, 460rwhp, I personally tuned this one.

FrostRacing 09-09-2003 10:27 AM

would the se engine handle 400+hp? also what would be a good ems to start out with i am new to tuning dont want to have any serious problems

IGY 09-09-2003 07:28 PM

To tell you the truth, I don't know much about the NA rotaries, the last NA rotary in Japan was in an SA. You can work around the high compression of an NA motor with experienced tunning, lower boost, and water injection. Since you are doing a rebuild, I would shoot for lower compression rotors out of a turbo motor and some turbo rotor housings.

setzep 09-10-2003 10:34 PM

What's the difference between the n/a and the turbo housings becides the sleeves?



I'm with IGY- if you want hp you need AT LEAST two things. The fuel supply and tuning. Once those two are in place the HP will be there if the rest of the system is built right (aka no t3/t4 turbo)


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