As the title says, I'm about to install a Pettit ECU, tuned for CB,DP, MP, cold air box and 15lbs of boost. My FD doesn't have the midpipe, but will have everything else. I am installing an a/f gauge tomorrow, just to provide some info as to how my car reacts.

With the ECU being tuned for a midpipe and me not having one, is it safe to run that kind of boost? Will I run rich because of it? Thanks for any help

......Ya Joel, it's finally going in!!

 

yes you will run rich...i've ran a m2 stage with with only a downpipe and exhaust for a lil while and it was fine. I think it means up to 15 pounds of boost it programmed for...should you run that?...I wouldn't..you'll need a boost controller either way. The ecu alone doesn't set the boost level

 

I have the home depot boost controller. I was thinking of trying 13 or 14 first, then see what happens....

 

I got the Pettit ECU. It does run very rich but it works great I have not had any problems with it yet.

 

a/f ratio gauge is usless, youll kill your engine if you try to use that as anything more then a light show. get on a dyno with a wideband as soon as you can and see where you really stand.

 

the a/f gauge will at least give me some insight as to how the car is taking the ecu. Better than going blind

 

You'll basically be "going blind" with both, because an a/f gauge won't be able to give you true readings; a wideband is the only way you'll be able to see exactly where your engine is running.

With a stock airbox and stock cat, you'll be working your turbos pretty hard to get 15 lbs. of boost (other than the transition spike), shortening their life considerably. Not to mention the chances you'll be taking with your fuel delivery using the stock fuel system....

 

Upgrade the fuel pump, its a cheap easy way to assure your stock pump dont blow the motor. Keep the boost at a max of 14psi. Most will tell you not to exceed that number. At 14psi. though, your car is perfectly safe to drive. If you try for 15psi your intake temps start going up real quick. Stay with 14psi. Im sure that alone will have you shitting in your pants coming from a stock car.

 

I also plan to do the cold air mod on my airbox, that should help a bit....

When I searched for info on the fuel system, it said for the most part that the stock system is fine if I do not change anything such as injector size or adjusting the pressure... so now this is untrue???? FAK you guys... make up your mind!

Oh ya... I will be more than impressed going from 10lbs to 14lbs? How much gain in 1/4 mile?

 

maybe go from trapping 100 to 110+mph. The launch is a different story

 

on second thought maybe not that extreme

 

I would suggest you do some more research before you nonchalantly start increasing boost. The stock fuel system is fine up until the point that you start maxing out the fuel injector duty cycles (which is generally accepted to be around 15 psi, but that is not cast in stone for all FDs-- each car is different). Simply adding a larger capacity fuel pump without doing anything else is just a security blanket IMO.

I would also suggest that you research the terms "turbo efficiency", "intake temps", and "melted turbo shafts" before you start running all around town boosting the stock twins to 14-15 psi with the stock IC.

There is no way to say "how much gain in 1/4 mile", because it all depends on your motor's condition and most of all, the driver....

 

FYI, adding a fuel pump will not increase your fuel pressure (unless there is a problem). There is a Fuel Pressure Regulator that adjust the fuel pressure (and stock is 1:1). The only way adding a fuel pump will increase the fuel pressure is if the FPR is getting overloaded (and it should be upgraded at that point).

 

 

Ok first, I am not "nonchalantly" boosting my car, hence the questions I do ask...

Second why would I need to change my fuel pump for extra security if I still would max out my injectors? There seems to be some debate about duty cyles and the importance of them compared to the a/f ratio(The link to the site is down. Mahjik knows the site). And I do know that a pump will not increase pressure. Now maybe Kento knows too.

As for 1/4 mile increase, you can give a guesstimite... Pretend your dragging a car consistently all day then you decide to change your timing and you gain some ET. I'm not asking what my car will run in the 1/4, but rather how much gain from stock. Driver, track, altitude and engine aren't different

I do appreciate your guys' help too by the way. Try to sound a little nicer Kento..... you come across a little grouchy.