I am going to go ahead and purchase the Pettit unlimited Ecu. I was wondering how much horspower can these Ecu's compensate for and how they are comparable to the Power FC Commander. Insert your comments

 

You are not really buying a computer, just upgraded pretuned chips (no wire splicing, no tuning afterwards)for more power at a loss/trade off of fuel economy and it takes away the fuel cut but does "not" take away the 3k rpm stumble

 

Suprakiller, i thought u said a few days ago u wanted a powerfc?

 

yeah so more horsepower right? how much horspower have guys been running with Pettit Upgraded Ecu's?

 

well lets put it this way there is a shop thats willing to give me a pettit ecu for cheap, the only problem with the Power fc with commander is that I cant get one for 1100 canadian. And number 2, the power fc is pretty pricy. I just want to know if Pettit ecu's can do the same job as a Power Fc commander can do. I have all my exhaust mods done and all i need to do now is open up my air intake box mod, and then I have all the bolt ons

 

The Apexi ECU will do what Pettit's Chips can do and more. The Pettit upgrade will do it's job up to 14.5lbs of boost, which are the limit on the stock twins anyhow.

If you want to save money, try cutting out the middle man!
http://www.superchips.com/import_a_mazda.html

 

Get the limited Pettit if you have a choice. You only have the fuel for the limited 14.5lbs of boost unless your going to get larger injectors and a separate fuel computer.

Later, Jeff

 

I honestly don't think anything truely rids the car of the 3k hesitation. Different cars experience the problem and some don't and not all of them are running aftermarket ECU's.

As for the power gain of a Pettit ECU, the ECU itself isn't going to give you a lot of power, however, it will allow you to run higher boost levels which will give you more power.

I still remember the day I installed mine, took the car out on the highway and hit 13 PSI for the first time... That was a rush...

As JeffShoots suggested, just get the limited ECU if you have a choice. On stock twins, you shouldn't push them past 14 PSI anyway, and if you upgrade the turbos or go single you'll want something other than a Pettit ECU at that time.

 

The Pettit ECU is not the same as a superchips ECU. Pettit's works much better.

 

with a dp,mp,ex,ic,intake,fuel pump,boost controller and the ECU
360whp and 310 TQ@ 14 psi
i also ran a 13.2@112 mph in the 1/4 on street tires (18s) and 3200 ft of elevation. i had to let off in 1st because of wheel hop and in 2nd because i almost hit the car next to me. and i still managed to get a 2.15 60'

 

...i'd open my Pettit computer and snap a picture of the "SuperChips" and then the receipt from Pettit Racing.

Yes it's possible the Superchips burns in Pettits maps but that doesn't mean Superchips can't acheive the same results.

Unless I get proof that Pettit purchased blank chips from SuperChips and burned them themselves, I have no doubt that it was sent to Superchips. But that would be absolutely ridiculous, I can get blank chips and burn copies at work and they won't have a SuperChips label on them!

But I could be wrong, there could be a difference between Pettit, KnightSports, SuperChips and any other company that does a chip upgrade.

 

The PowerFC does. My car used to have the 3k hesitation and ever since I installed the PowerFC, it hasn't done it... ever, not even once... I barely even remember what it feels like now. Also, I don't know anyone with a PowerFC that still gets the hesitation.

 

Tuned ECUs dont have near the flexiblilty of a FC comander... If you are not planing to make more upgrades in the future be cheap and get the pettit.

 

one more thing, the timming on the pettit ECU is advanced and the car runs really good on race gas.

 

I have been using the Pettit for a few years now...
I get decent runs at the Dragstrip. Allot of other do as
well. Brooks/Anthony... Some well known 3rd gener's
have gotton into the 11's too. I have been close but not quite as fortunate.

Get the Pettit... I haven't heard of any low e.t.'s with other programed ecu's.

The 3000 rpm thing can be a pain. But I always stay away from that rpm for the first 5-6 mins from the car being turned on. After when fully warm you should not
have the hesitation.

jc.

 

I have had the Pettit ECU. I first had the one that was limited. I called Cam and he sent me the chip for the unlimited. I opened the top, popped the chip in and that was it. I ran 11.1's on that ECU and an AIC. I ran a 11.4 with the Pettit ECU alone.

The Pettit ECU is amazing. I ran my car HARD all year long and never had any issues. Why did I go Pettit? I used to live in FT Lauderdale FL, I met Brooks and Tom one day at an event in MOROSO. When I saw how well Brooks car did with the Pettit ECU, I was shocked.

I just copied his system, threw a set of gears in, added an aic for some more boost and low 11's was the result.

Just my 2 cents

Anthony

 

since this is a thread about pettit's ecu i have a question. if i get the ecu now and run an intake, dp, and catback w/o the boost controller what boost would i hit? do i need to get the boost controller if i get the ecu?
nick

 

I have had the pettit stage 1 unit since just after it was availible.With every bolt on and a profec B,stock eng.,turbos,injectors @13-13.5 lbs.boost run low 12s and have never had a problem with the unit.

 

Just because you don't notice it, doesn't mean it's not there. It's probably that much less noticeable.

Also, nobody has actually diagnosed what causes the 3k hesitation. Many people do not experience the problem even with stock ECU's.

There are many theories on what causes it, primary to secondary injector switch, grounding problems, etc... If any of those are true, I don't see how just an ECU is going to completely eliminate either of those.

 

I don't think you have an upgraded intercooler yet as reading from your posts, so I don't think you'll have all the bolt-ons after the air-box mod.

Also I say get the pettit, who's going to tune the PFC for you? That 2 bit place that's selling you the pettit? Doesn't sound like they know too much and it's not worth having a PFC if you don't know anyone nearby that can tune it right.

 

I love my Pettit ECU (two years now, no problems)

it's great for shooting flames at unsuspecting rice

 

Damn... 700 dollars for the limited chip. Good Lord that's expensive. At that price I think that I would just save for a couple more weeks and get the full blown Commander.
Am I wrong?

 

Looks like someone finally has a good lead on the 3k hesitation problem.

https://www.rx7club.com/forum/showth...threadid=91818

If he's right and it is in fact caused by the ecu not switching the fuel pump to high speed mode quickly enough then that could by why I don't feel it... maybe the PowerFC does switch it quickly enough to avoid the problem. ...either that or it's really THAT much less noticeable that I don't feel it at all and I just consider it to not be there.