kahren

efi is ALWYAS better then carb, go with some nice intake manifold, dont forget a stadnalone and of course a nice exhaust.

is there a reason u are doing a bridge? there are many things to consider when goign with bridge.

idle will waste noticebly more gas due to teh fact that u have to run it richer because of overlap and the idle speed. this btw DOES affect gas milage a lot

the car shakes on idle, donno if some people like that. some bolts also coudl come undone to to this fact.

low end is not as good as with stock/streetport and unless you are doign a half bridge with a "special" intake manifold you cant really improve this, launching the car is harder from start while daily driving.

doesnt cruise very well, low air inlet velocity at low revs make teh car a bit shaky to drive.

also you will prolly want to build the motor to take some revs since the power band will move up higher this means more money into teh engine.

these are most of the important ones i can think of off of top of my head.



also if you dont proerly do a bridge then you will not be gettign as much power out of it as you should. i consider bridges to be over 250 at wheels.



witha proper streetport you should be gettign over 210 at wheels.

smiley-se

I was just seeing what you guys thought of the bridge I knew where many draw backs to the bridge so I think I'll stick to the street then. Unfornatly I'm a poor college student and the rebuild is going to put a huge dent in my buget so stand alone is out of the question but maybe I could do an s4 or 5 intake, ecu, engine harness swap. I have the 680s for the secondarys along with the 460s that would be more than enough fuel but can the gsl-se fuel pump, pump that much fuel or will I have to up grade. Just so it's clear this is what I'm thinking after taking in everything you guys have said. Big street port and s5 ecu intake swap with the 680 injectors. Would that be better than carb or would the mukuni side draft be better. One more thing my buddy has a hks f-con piggy back he says it's for a s4 turbo would it work for and s4 or s5 ecu. thanks

kahren

get a used AFC on ebay,the hks one is not so good to work with

4 of the 460 injecotrs will get you about 210 at wheels or so, but not on a stock ecu

i dont think, the ecu doesnt let teh injectors get up to teh hihg duty cycles even with the AFC.





the FC intake will not just bolt up there is slight modifications u can do to fit it. with a street port u want to use s4 intake manifold it will net more power. if stock port motor then use the s5 as the power band will be better. who is portignteh motor, i found it useless to port the aux port, since the runner length is so small the it doesnt allow for flow even with increased port timing and better flow. though if you remove teh sleeve and port the aux then it coudl net more power. basicly if u are palnnign on using the stock sleeves then dont port the aux.



most power from portign the NA comes from the primary port porting and exhaust, since there is not much to work with on teh secondary port and the aux. just FYI.

smiley-se

So what your saying is the s4 intake works better on ported motors and the s5 works better on stock motors. If this is correct what is the modification I most do to get the s4 intake to fit. When I redid my intake the only big differance I saw was that there was a hole that led to the bac I think. I have a block off plate there now I forget what it's called. Also do you have the template for the 210 at the wheels street port. Does any one have any templates I can print off.

kahren

i remmber someone postign it here if memory serves right, you shoudl eb able to find out how to mount the s4 intake on the gsl-se. or you can always take the LIM gasket from both engines and see the diffrences.

you wont get "210" at wheels with the s4 intake, it simply wont flow enouf.

you will need to go with somethign like the racing beat intake and TWM throttle bodies. which would then mean you have to go with a standlaone, unless you want to rig up the afm and a bunch of other stuff onto the new manifold setup.



i am currently working on a prototy manifold for the NA that would make you spend much less money and great results.

smiley-se

Then what about the side draft mukuni it will flow more it won't be fuel injected. If do end up doing the s4 intake swap will the gsl-se fuel pump supply enough fuel for 200hp same with mukuni will it be able to supply enough fuel.

kahren

not sure about gsl se fuel pump , maybe first gen guys can answer that.

but if u go mikuni then all this is out of quastins, u just dont get as much adjustability with teh carb that you do with the fuel injection.

smiley-se

All right so stay fuel injection, what do you guys think about the atkins rebuild kits or are there better brands out there.

ryosuke_fc

I used an Atkins Rotary rebuild kit on my engine last. I was pleased with it. It came with everything I needed. They're nice people there as well. Always willing to answer any questions I had. I would probably get the parts from the local Mazda dealership now, but that's just because I get a really good discount there. I would still recommend Atkins to others.

kahren

atkins is good for NA , i am talkign about apex seals, the prices are decent

if you have intentions of turboing hte car later get some other apex seals.

i havent had great luck with their apex seals for turbo applications.