TobiasRX

I am putting a few mods on my car this winter.

dp, catback,highflowcat,airfilters and a AEM ECU.

I've been wondering if i need a boost controller for this?

The ECU should probably be able to increase fuel to compensate for eventual boostspikes, especially when the 4500 transition comes on but i'm not really sure.

what do u think?

Mahjik

iTrader: (1)

Boost spikes are the result of increased airflow, not leaning out. However, you can use a valve type boost controller if you need it. You really won't know until you put everything on the car and try it out.

I doubt you'll see spikes that high, if at all. The highflow cat will help maintain boost levels easier with the added backpressure.

Just hook it up and see what happens. Every car is different.

jdhuegel1

You shouldn't see spikes with a hi-flo cat on there. The ECU should be perfectly able to provide fuel...

You could always go Non-seq too..

*EDIT* Damn... beat me to it...

TobiasRX

Yes, i thought so myself actually, a friend of mine scared me alittle when he said i had to get a boost controller but i didnt really believe him. I'm new to turbo so i'm learning new stuff all the time.

While we are at it i have a few questions about the pettit hiflow.

what A/F ratios can it handle? and is the insides ceramic?

Mahjik

iTrader: (1)

That's not entirely true. I've seen mods such as just a catback, downpipe and DIY open air intake cause boost spikes. It's usually the intake mods that cause the spikes from what I've seen. But, as you said, the ECU should be able to handle delivering the proper fuel (provided it's tuned correctly).



However, it's MUCH easier to control spikes than creep. With a high-flo cat, you'll avoid creep thus making any other boost control fairly simple.

As far as the Pettit high-flo, sorry, I don't have any info aside from what's here in the forum (in which case most people have reported the cat failing after 6 or so months).

Mahjik

iTrader: (1)

BTW, you can email Pettit and ask them about their products:

Email Us: info@pettitracing.net
(Due to the high volume of email please limit your response to 50 words or less. Thank you for your cooperation.)

neevosh

The ECU does compensate for boost spikes at transition. The fuel cut is set higher around transition for this very reason.

Bucrx7

Doesn't the AEM EMS control boost also?

Nathan Kwok

You should be able to use the AEM ECU to control boost as well as a PFC, but it is a new product so no one is really using it yet. The AEM does give you control over wastegate values though, so you can just adjust the duty cycles to keep boost at 10psi or whatever you want and tune it for that.

Nathan Kwok

oops

TobiasRX

I will see how it goes witht the boost when it's tuned.

I bought the pettit for only $235, so if it only holds out 6months it's really no big deal since i can always weld on a new cat.

jdhuegel1

Yeah... You're right. I often answer with experiences from my car... I have a few friends with stock cats that spike... (forgot about them)

Thanks for the fix!