I've searched and found one answer, one forum member claimed that his friend's FD went from 230 to 300 WHP, he/she didn't specify what mods were on the FD, only that the boost went from 10 to 13 psi. I was skeptical of the claim.

However, I put one in my car (streetport, DP, RB Cat-back) last week and was surprised by how much stronger the car felt. It seems like the Pettit ECU increased the boost to go along with the fuel and timing changes. Does the Pettit ECU command a higher boost?

Anyways, back to the main question, how much HP did I gain?

Thanks for the replies.

 

with your mods and 13 psi, i guess you would be around 300-310whp... get a midpipe... makes a great difference.

Max

 

The Pettit ECU will not give you more power. It will allow you to run higher boost at safe air/fuel ratio's. Running higher boost will mean higher HP. If you had 13 psi before installing it, and 13 psi afterward, you will not have increased your HP.

 

That's what I thought, except that the car feels stronger after I put the ECU in. I don't think it's expectation bias since I wasn't expecting much, I only put the ECU in so I can add an intake and SMIC in the future.

Perhaps the timing changes in the Pettit ECU is more in tune with the streetport vs the stock ECU? I did call Pettit Racing and the guy I spoke to said that their ECU will support a streetport.

 

Any ECU will support a street port if you don't boost very high.

 

Agreed.

But why does replacing the stock ECU with the Pettit ECU make the car feel stronger?

Is the Pettit ECU allowing more boost? Timing changes?

I haven't upped the boost, I don't have a boost controller so I couldn't anyway.

BTW, thanks for the MP suggestion WanKeL FD, but I need to keep my cat, we have to go through emissions testing every other year.

 

Truthfully I think the change is in your head. Unless you are running more boost now than before.

I put in my Pettit ECU back when my car only had DP, CP, K&N and didn't feel a difference til I put my MP back on and uped the boost.

Wait, 1 difference: I could now launch flames due to the richness.

 

I agree 100%

 

This is something I am thinking about doing myself. Can the Petit ECU with the stock fuel system handel having a midpipe with the other stated mods?

Im worried that the stock injector duty cycles will have to be set at 100%, to atempt to keep the car from leaning out. If this is the case, I would only be asking for trubble on a cold night. Maybe there is someone with a bit more knowledge on this subject.

 

My mods are in my sig. I've been running between 12-14lbs of boost, no boost controller, with the pill in the wastegate line. It's still rich as hell, shooting flames, etc.

I may take the pill out when I go home since it's cooler than the last time I drove it.

 

Do you have a stright MP or a resonator MP? Because I was wondering If you could still get the flames with a resonated MP.

 

I have a hi-flow cat and can get flames between WOT shifts so I would say yes.

 

i dont see how it would have increased your boost. i dont know im just asking wouldent your car run rich if it had a comp tuned for 13 lbs and you only used 10? then you would lose power? im asking?

 

The Pettit ECU will allow up to 12 to 12.5 max on pump gas and the stock fuel system. You can get by at 14 to 14.5 max psi on racing fuel and stock fuel system, but they recomend a fuel pump upgrade for 14.5 to 14.75 on racing fuel.

 

Dang, you people are a pessimistic bunch. Alright, I will bow to your greater knowledge, experience, and (more importantly) data points and recalibrate my head to no gains with the Pettit ECU.

The car still feels damn good though.

 

If you were to swap out the stock one for the Pettit (all things being the same) you really wouldn't notice a difference till you installed the Mods it's tuned to work with. This thing really comes alive with the mid pipe.

 

Who did you get this information from? I have been under the impression that the "unlimited" ECUs are able to handle 14psi with the STOCK fuel system on pump gas.

 

I think you'll find the only difference between the "unlimited" and the other ECU is that the fuel cut and rev limiter are gone in the "Unlimited" as I'm led to believe there identical in all other respects. They still only recomend 12 to 12.5psi. on pump gas and 14 to 14.5 psi. on racing fuel but suggest a fuel pump upgrade for 14 and above psi. Not saying it can't be done, just not recomended. It's been awhile since I've been to there web site so things may have changed.

 

I think CantGoStraight is right.

I called Pettit before buying the ECU (I didn't buy it from them however), and the guy I spoke to said that it was tuned for 93 octane gas. When I told him that I could only get 92 in my area, he replied that I should keep boost below 13 psi.

As I recall, he also recommended that I should not go above 13 psi unless I had race gas.