mack123

iTrader: (4)

On a stock 88 turbo 2, if a person added the complete racing beat exhaust or equal, that removes cats etc, would I need an upgraded injector size from stock ?

I see that injector size is different on a gxl versus the turbo, with only about a 40hp difference. I see that the total free-flowing exhaust would add maybe 30-40 hp. So Im thinking I may need an upgraded size.

Does anyone have any experience with this situation? any info would be appreciated, also specific brand names of injectors if ugrade is needed.
Im looking at buying injectors within a few days.

I do just regular street driving, no racing,ect.
thanks

RETed

No.

Uh, I don't understand your point...
Are you trying to turbo an NA (i.e. GXL)???


-Ted

gentlejax2

NO- he is comparing the power of the stock TURBO to the power of a full exhaust equipped GXL. I didnt think that was so difficult.

your injectors should be good for at least 200hp according to the FAQ. I read that last night.

RETed

It doesn't matter since an NA is not going to get even close to maxing out it's injector capacity...


-Ted

mack123

iTrader: (4)

Thanks for your replys but I seem to have been misunderstood.

I have an 88 turbo 2, I want to to add the racing beat exhaust or equal, which they claim adds 40 hp. { actually they say 60, I think its less }

RIght now I have stock injectors and stock fuel pump, on my turbo.

Question- would I need upgraded injectors or fuel pump by adding the racing type exhaust set up ?

I made the comparison to a gxl only in reference to the gxl has 40 or so horsepower less than a turbo, and yet it has different injectors, which made me think that new ones for my turbo might be needed.

thanks all

BlaCkPlaGUE

Even if your car did get +40 Hp from those mods (wich it won't) the injectors could still support the application.

They use 550cc on the turbos becuase the duty cycle is reduced with that size @ 200hp. Pretty sure anyways..

Adding the exhaust will net 40-60 more horsepower if you add more boost to the application. You will not see that kind of hp running stock boost.
The S4 turbo is only efficient up to like 10psi I believe, and your going to have to have a ported wastegate with that exhaust setup or your going to be running like 17psi in no time, lean out and pop an apex seal.
Even if you left it at 17psi (your crazy) and had a fuel controller and richened it to its fullest (overloading injector duty cycle for sure) the intake charge would still be WAY to hot and would most certainly detonate.

Ottoman

does the stock TII really creep that badly?

would u need to mod the wastegate flapper? or just smooth and port it's flow?

how about externally dumping it?

I had a similar boost creep problem on my DSM.... best way to eliminate the creep was a bigger O2 housing with an external dump

syklone

You can either port the waste gate up to the max size allowed by the flapper, or have a new flapper welded on and port it even bigger. At least port it. If it still gives you creep problems then get a larger flapper put on. I've never heard of an rx7 with an external dump wastegate setup like you describe.

And no, you don't need new injectors by adding the racing beat exaust. A new Fuel pump and the rewire mod are good, safe, easy and relativly cheap mods that should be done though.

mack123

iTrader: (4)

Ok, this is good info. So, I would not need the larger injector size, yet I would probaly need to have the wastegate ported or it would go up to around 17 psi and most likely throw an apex/internal damage,etc.

hmnn. I need to rethink my purchase or plan on porting.

Mazdatrix and Racing beat ads both say a fuel cut controller is needed with the exhaust, at least. I knew something was up, or they wouldnt be adding that.

thanks all, this is great info and this site is becoming a valuable tool in an ever increasing hobby.

classicauto

iTrader: (3)

a little off topic but.........
id like to see before and after dyno charts with this RB exhaust....
40-60 hp from a hp free-up mod on a 1.3L engine?
thats nearly 50% of the power thats made out of a stock n/a (in bhp)
10-15hp MAYBE

Ottoman

here's what I was talking about:
Rather then the exhaust gas splitting and then recollecting in the exhaust, the "portion" that goes through the wastegate is dumped... best way to kill boost creep, but car becomes loud on boost

syklone

Wow, that would be LOUD. But you wouldn't have nay boost creep, thats for sure...

A'PEXi 7

will using an FCD increase the chance of going lean, because the computer is seeing a lower boost level?

kevlar999

Get an rtek 1.5 chip if you have an s4 t2, thats what i'm doing as i'm gettin fuel cut, i have 2.5 exhaust no cats and a tid mod and i'm getting fuel cut

RETed

NO.


-Ted

NZConvertible

Timing will not be retarded as boost increases, which basically gives the same result as lean mxtures...