revsteve

iTrader: (6)

Current Mods:

DP, CB

Future Plans:

High-Flow Cat, IC, CAI

I have a line on a pettit unlimited. What would my boost levels be w/ all mods (on stock seq twins)? Pettit unlimited is good to 13psi, and w/ just DP & CB I am boosting at 12.

Should I look to go Power FC or some other ECU?

Also, in theory, does getting some kind of ECU eliminate the need for a boost controller w/ my current mods? If its safe up to 13 PSI (and I hit 11/12), that kind of eliminates the need for boost control yes?

I literally know NOTHING about ECU's so please assume so when replying.

Thanks

Steve

Rxmfn7

iTrader: (4)

I am one selling a Pettit unlimited, but my response here is not trying to make a sale. The "best" ECU choice would be the PowerFC hands down. Basically you will never have to buy another ECU , no matter what mods you plan on doing. Plan on going single? No problem just get teh PFC retuned and youre good to go. The only real isse ( if you want to call it that) with the PFC is that for it to perform optimally, it is only as good as the person tuning it. Youre going to have to spend ~$650+ on the PFC alone, and then a few more hundred to have it professionally tuned. And if you cant find a good tuner in your local area, you will need to drive somewhere or have one flown in. This is the reason I went with the Pettit ECU originally. Cheap price to find a used one ($400 or less), and it is completely pre-tuned and good for about anything you throw at it on stock twins and up to 13psi). I was running 12 sec 1/4s and trapping ~112mph with a slipping clutch on this thing, and I just loved it. Plus the resale value pretty much never drops. You can run it for a few years and then sell it for just as much as you paid for it. Dont take my word for it though, do a thorough search and you will pull up a ton of info and opinions of different ECUs.

And if you are hitting 12psi without a controller, that is nothing but creep. You really shouldnt be getting any creep with just a DP and a catback though, do you have an intake or any other mods? If not your WG may not be operating properly.

revsteve

iTrader: (6)

Hey Lenny -

Thanks for the response. No other mods. Stock airbox & IC. Silicon hoses are the only other thing I have done to the engine bay other than upgrading the rad & AST.

Creeping to 12 still blows the motor though (at least in theory). I have considered re-adding a CAI setup or just doing AdamC's poor mans airbox mod.

I should probably have the whole setup checked out anyway, but I am trying to avoid the redundancy between the Boost Controller & the ECU if there is any.

Sounds like I need them both. If thats the case, I really only want to limit the boost to 10psi so as not to blow the motor.

Rxmfn7

iTrader: (4)

There is no correlation between the ECU and the boost. Boost is restricted (controlled) in our stock system in 2 major ways. One, the spring tension in the wastegate, and two, is the boost control solenoid. With no means of boost control (including stock solenoid), the lowest boost you will see is 7psi, which is the pressure the stock wastegate opens at. With a boost controller, you can limit boost down to this level, but no lower. Boost controllers cannot lower boost past wastegate spring pressure, only raise it, and control the speed that it opens. You really should have no problem staying with the stock 10psi with your only 2 mods, if you do, I would look into a problem with the wastegate, or put a different gauge on it for verification. It is not uncommon for boost gauges to be 1-3 psi off, especially a cheap or old model.

BMike

You might be able to get the boost back down where you want it by removing the restrictor pills in the wastegate lines. Do a search on it if you want to learn more. The PFC is nice because it can use the stock solenoids to regulate boost pressure up to about 14 psi, and as was said you'll never need to replace it if you decide to do more to the car.