just wondering when i am going to be maxing the stock injectors out... the stocks are 550 right? so i guess the question is, when am i supposed to upgrade?

Thanks
Ben

 

close, they are 525cc, you can take more advantage of the stock injectors, by using a 255lph fuel pump.

Talal.

 

id upgrade when you pass about 300 whp, but I guess once you get cams etc.... depends I guess

-shahul

 

If you plan on upgrading your turbo, upgrade your injectors. Stock injectors should be good <350whp. Using Jeff Hill from Turbotrix as an example, he made 351whp with 315 ft lbs of trq with the stock front mount and stock injectors.

 

i heared they are 85% tapped stock, id upgrade sooner than 350whp

-shahul

 

I have not heard that personally, so I can't really comment on that, but the guys at Turbotrix say that the stock injectors are fine for 'mild modding'. All I can really say about our injectors are that i'll be upgrading mine just as a safety percaution before I upgrade my turbo.

 

i think i'm just going to go with the fuel pump and also get an air fuel ratio gauge... With the gauge i should be able to tell when i'm going to need to upgrade right?

Thanks for all of your help!!

Ben

 

be careful what AFR gauge you get..some are worth it, others are collasal wastes of money

 

which one would you recomend??

Ben

 

One of the wibeband sensors like these:
http://www.urdusa.com/Merchant2/merc...gory_Code=PERF

http://www.widebandcommander.com/productinfo.htm

http://www.turboxs.com/txstuner.htm

http://www.innovatemotorsports.com/index.html
I have the last one and it works great for tuning fuel.

 

isn't there a gauge that can read air to fuel ratio??? ex. a gauge made by defi, hks, greddy.... etc.... that can fit in a gauge pod..

Thanks
Ben

another thought... i've seen just the cable for the wideband (i think). do you think that i could hook that up to a regular air/fuel gauge from one of the brands above?

 

you're thinking of a narrowband?

 

The stock EVO injectors are 560 cc actually.

We have made 361 whp and 303 ft lbs. The car ran a 12.09 at 115 mph on 94 octane like this.

The stock injectors with a pump upgrade should be able to make over 400 whp in the car with the correct tuning.

David Buschur
www.buschurracing.com

 

Crap !!! and I just ordered some 660s and a pump.
I put in cams so I thought it was a wise precaution.
But I don't believe I'm going to get near 400whp.

 

What's the duty cycle and fuel pressure at this power level though? I'm afraid of the wear and tear on the injectors and fuel pump if this comes from high duty cycles and high fuel pressure. Throw some numbers at us David. My right foot rests on the firewall daily