As mentioned in another thread it\'s rebuild time.....
I\'m considering going for a large Streetport - or should I go half / full bridge?
The car is not used on the road much, though it is a road legal car - and i would like to be able to take it out at weekends.
Is a bridge port going to make it too much of a pain on the road?
Another thing to consider is the choice of turbo - I\'m hopeing that I can get away with running my BNR stage 3 turbos non-sequentially, and stick with my HKS / Racing beat exhaust - which is plenty loud enough for me, and also most track day noise limits.
If a bit of a tip has nuked the turbos then I\'ll go to a GT35R or GT40.
With either option I want the car to have good response, and come on boost nice and early rather than a big peak bhp figure. So what do we think would be the porting to go for?
The rest of the setup is taken care of as far as cooling and fueling is concerned, and clutch is an exedy hyper single plate.
:Thumbs-up
If its for the road then go for a large streetport, its what im going for and I will be running a T88, anything above a large streetport will obviously mean the idle suffers and you lose the power low down.
I would suggest a large streetport so that it give you the extra air and exhaust flow you need and still keep it drivable :)
I run a full bridge and have no problems on the road with it but i would say with the info youve put up to go for a large streetport should be more than sufficient for your needs
Quote from: lee mills;668286I run a full bridge and have no problems on the road with it but i would say with the info youve put up to go for a large streetport should be more than sufficient for your needs
Much brappage :D
Go J Port ;)
after running a half bridge for the last few years there are good arguments for and against. They can behave quite well on the road and if driven with a little practice can be smooth enough but when you put your foot down OMG. The main 2 draw backs are they are thirsty, very thirsty and the noise which can be controlled but isn\'t as easy as you would think.
I would speak to your chosen engine builder as I\'m sure they will be able to get you a test ride in various cars, or go to one of the meets in your area and ask the members there for a ride.
Matt
Another thing to consider is that I would like to keep my HKS downpipe and racing beat exhaust to keep the noise down for trackdays.
Would that be too restrictive for a bridge port?
J-port is out from the research I have been doing. If you would recommend one could you explain why, and what the pitfalls are?
dont go bridge if you keeping the Twins it will outflow the manifold and you will find it hard to maintain a steady boost level as the wastegate would be too small even when its ported.
If you are driving on the road and using it for trackdays (not competition) go for a large streetport. Bridge ported motors take a lot of effort in keeping them quiet enough to be allowed on most circuits.
Dont listen to Kash he is only joking. A J port is an extreme form of Bridge porting where by the seconday hole eyebrow is made very large port goes into the water jacket and devcon is used.
Thanks Mark - you have PM by the way....:Talking1
Also if you keep it with a large street port there is still some plate to actually let the corner seals on :rollin
Suba sent you a PM response, My recommendation is go with large street port.
http://www.mazdarotary.net/porting.htm (http://www.mazdarotary.net/porting.htm)
Mark shut up man you\'re a killjoy
SuBa sounds like a large large streeport is your best bet for what you would like... maybe stretch to a half bridge but not past that
i have a large street port and use it every day mate its fine i wouldnt go bridge unless its tracked just to much effort to stay in the red line on the queens highway lol
Thanks for all the replies - does anyone have an idea of what kind of power increase I could expect from a large streetport, and moving the BNR\'s to non-sequential? I was running 330 at the wheels on stock engine at a bar sequentially.
Bryan at BNR says 400 at the wheels is achieved regularly - which is quite a jump in power!:xconfused
i have a 3" holesaw
Quote from: mx1311;668640i have a 3" holesaw
Will need a tub of Devcon to go with that.
ill cut them with a hand drill too kev ;)
c
Quote from: mx1311;668645ill cut them with a hand drill too kev ;)
c
Just like Tim LOL
Quote from: m1tch;668489Also if you keep it with a large street port there is still some plate to actually let the corner seals on :rollin
You\'re right - if you went with a bridge port, it\'s almost like you\'d have to leave some material for the corner seals to run on, sort of like a bridge... ;)
Quote from: lee mills;668286I run a full bridge and have no problems on the road with it but i would say with the info youve put up to go for a large streetport should be more than sufficient for your needs
hi lee im going for a bridge port soon who done yours and how do you find it spooling your turbo?
Quote from: SiH;668829You\'re right - if you went with a bridge port, it\'s almost like you\'d have to leave some material for the corner seals to run on, sort of like a bridge... ;)
Thats crazy talk, I thought rotaries ran on magic :rollinif you check out Dragon\'s drift car thread it seem you don\'t even need to run rotor housings :rollin
Slightly off topic, what sort of redline can the engine safely run with a large street port?
Mine is still restricted at 7500rpm and I am semi-dissappointed.
And yes, large street port with a decent sized turbo is lovely both on road and on track.
A rotary engine doesn\'t produce a lot of torque even with a big single, so a Exedy hyper single clutch should do ok for a 400whp car.
Depends on what you regard as not a lot of torque, I produce approx 330lbs of torque at 1.2BAR.
On higher boost even my twin plate was not holding and was slipping with new plates.
But a good single plate (not organic) should be able to hold 400whp, its when you go over 450whp that things get tricky in the clutch department.
I would say 8.5K rpm is safe if all the internals are working correctly
Would the BNR turbos have enough puff to keep pulling at 8,500 rpm when running non-sequential on a large streetport?
It was recommended by the Old Dude who did my porting that I\'d be able to run a limit of just over 8k - that\'s with a reasonably sized \'street\' port.
Quote from: suba;671005Would the BNR turbos have enough puff to keep pulling at 8,500 rpm when running non-sequential on a large streetport?
You should always change up gear just after your power peak curve starts to dip.
When you get it mapped and dynoed then you can see your power curve on the graph , then you can see where you should change gear
So eg if you hit peak power at 7.3K rpm and it holds till 7.9k then starts falling away quite rapidily then you would change up at 8k
Quote from: francovel3;670937hi lee im going for a bridge port soon who done yours and how do you find it spooling your turbo?
Tim @ Rxmotors did mine and was tuned by Jaydee. im getting full boost by 4400 rpm:Thumbsup!
Quote from: lee mills;671082Tim @ Rxmotors did mine and was tuned by Jaydee. im getting full boost by 4400 rpm:Thumbsup!
sounds good lee what turbo you running
T51 kai:mmmm
Quote from: lee mills;671111T51 kai:mmmm
thats and early spool up for a t51 thats good, i need to get my t04z fitted and see what they can make of it. i thought reworx done your car.
No Reworx didnt do it Tim always looks after it the situation with reworx was a sore point which i dont want to go into on the forum
Quote from: lee mills;671116No Reworx didnt do it Tim always looks after it the situation with reworx was a sore point which i dont want to go into on the forum
ok no problem
Whos doing your engine work?
dont no yet got a few in mind and reworxs is one of them but just wanted to know peoples opinions thats all. im gona go for a 1680cc kit aswell
I would of thought Jaydee would be the closest to you?
Quote from: lee mills;671124I would of thought Jaydee would be the closest to you?
ive got 1 month to think about it so ill do the comparing its like compare the market .com at the moment for me....
Its all good fun (apparently):Giggle
Quote from: francovel3;671125ive got 1 month to think about it so ill do the comparing its like compare the market .com at the moment for me....
maybe someone should make
comparetherubild.com :Laugh
Quote from: L18M;671133maybe someone should make
comparetherubild.com :Laugh
yep they should and it should tell you the pros and cons
Quote from: BlitzBoy;670997Depends on what you regard as not a lot of torque, I produce approx 330lbs of torque at 1.2BAR.
On higher boost even my twin plate was not holding and was slipping with new plates.
But a good single plate (not organic) should be able to hold 400whp, its when you go over 450whp that things get tricky in the clutch department.
I would say 8.5K rpm is safe if all the internals are working correctly
Hi, Blitz boy.
When you say slipping, is that on a drag strip or just driving normally? I might need to upgrade my clutch soon just want to make sure that I get something that will get sth that I never have to upgrade again.
8.5k rpm sounds sweet. I could always use 1000 extra rpm. Where is the best place to go for a remap around London, although I am willing to travel for a proper map.
that was on the drag strip full WOT through the gears.
If ya in North London it would be Jaydee
Quote from: Kash_;668349Go J Port ;)
after running a half bridge for the last few years there are good arguments for and against. They can behave quite well on the road and if driven with a little practice can be smooth enough but when you put your foot down OMG. The main 2 draw backs are they are thirsty, very thirsty and the noise which can be controlled but isn\'t as easy as you would think.
I would speak to your chosen engine builder as I\'m sure they will be able to get you a test ride in various cars, or go to one of the meets in your area and ask the members there for a ride.
__________________
Quote from: BlitzBoy;671258that was on the drag strip full WOT through the gears.
If ya in North London it would be Jaydee
what clutch do you recomend for a 400-450hp rx7 blitzboy im looking for one but cant decide?