I will be running a monster street port engine, strait pipes, cold air intake, electric fan ect....
My car is a 1986 GXL
How do you know what size injectors you need? I want to maximize the port and intake without blowing my engine.
Can anyone help?

 

I'd say go with 550 secondaries, possibly more. Depends on what you mean by monster. I would get a SAFC, possibly standalone depending on your money supply.

 

550cc secondaries would be more than enough, possibly too much. As far as I know, there isn't much to port on an NA 6 port motor so I question how "monster" it really is. The stock NA injectors will support 200 rwhp and I have yet to hear of a 6 port NA making that much power. If you do get larger injectors, an SAFC and wideband tuning are mandatory as you don't want any overabundance of fuel killing power/gas mileage from your ported motor.

 

The guys at banzairacing.com are porting my engine out, they're also doing a full aftermarket rebuild with teflon parts. I know you cant port the exhaut and there are restrictions with an 86 GXL, but i want to get a standalone and im hoping for 250 RWHP after im done with all my mods.

 

Without knowing his numbers, just threw out the 550 to be safe. I'd say the 460's(?) would do enough, but...

Now that I know you're going to be shooting for 250rwhp, possibly even more than 550's? I'm not too sure what the 550 can handle.

 

Is there a chart somewhere that graphs out HP vs. INJECTOR size? If not someone should make one it would be really helpful.

 

I'm sorry to say that 250 RWHP is not a realistic goal at all. The only way I see an NA making this kind of power is with a 4 port TII block, high compression rotors, a huge streetport or a brideport and a standalone or carbs and around 9K in revs. With the 6 port block 200 rwhp is probably the absolute limit. Those rebuild parts won't get your more pwoer but a fresh motor is always a plus.

 

So your saying that with my new rebuilt engine, cold air intake, weight reduction, stand alone, new fuel ijectors, strait pipes, electric fan, and a shot of NOS along with other mods, that 250HP is not reasonable?

 

You never mentioned nitrous

 

It will be hidden, i like the stock sleeper look, it will be a nice honda killer

 

How do CC's compare to the american fuel injectors rated for gallons per hour? I think im not sure, whats the conversion rate?

 

lbs/hour x 10.5 = cc/min


-Ted

 

Since when can you not port the exhaust?

 

the N/A's have that damn diffuser in the exhaust port opening. Unless you cut that out somehow, you can't port it reasonably. I say have sombody cut it out, because the exhaust is going to be your hp killer in this scenario, or else go with turbo rotor housings and have them port the exhaust on those

 

Yes I know it has a diffuser, but my question still stands... You CAN port the exhaust if you get the diffuser out.

 

This thread reminded me of an interesting thing a rotary builder i know did.
He droped a 13b in an old 70's corolla and somehow made it so the car redlined at 13k rpm. He said the rotary engine has a much higher rev limit than what is commonly known and that it can perform even better if its rev limiter is reset and raised.
I dont have a clue how he did it but i do know that car is a really quick n/a.

 

Upgraded internals, lightweight rotors, matching port, it can be done... RB sells lw rotors and stuff for these kind of applications.

 

He's lying.


-Ted

 

what is the purpose of the diffuser? is it necessary with a standalone and straight pipes?

 

The purpose of the diffuser is to **** you off.

Seriously, though, I have no idea. Maybe to quiet the exhaust a little, something with restricting the exhaust for some stupid reason, I have no idea. All I know is that a lot of n/a guys switch to TII housings or grind those out when doing porting, so what is the real point in them?

 

Oh yeah, the weight reduction is a well known way to increase HP! I cut the roof off my car and I'm putting down like 300 to the wheels yo!

 

Alright if you rev a rotary up to that high of an RPM eccentric shaft flex is going to come into the equation.

 

The real point of them is the quiet the exhaust A LOT! Grinding them out brings out the real "chainsaw in a bee hive" sound from the 13B. If you want to make max peak HP, go ahead and grind out the diffusers, but get ready because you will get some attention.

I'm not saying that removing the diffusers makes the car unstreetable, I am saying that there is a night and day difference in the volume and tone of the exhaust.

 

Not only that, but that electric fan really boosts the HP up too

 

HAHA!! Awesome, my exhaust is already so loud my neighbors hate me, this is going to make em love me so much. I'm in the process right now of a rebuild and port and will be getting those diffusers out and doing a smaller SP to the exhaust port.