the reason you need a tune to boost over 23 psi is because 1. you can go into over boost protection (happened all the time in my old porsche until i chipped it... feels like you blew up the engine when it kicks in... hahaha) 2. from what i understand (still new with the ECUflash tool) you are out of the stock load ranges and it will shift to a safer mode, thus limiting the power gains. flashing it can fix that.

 

great explanation KevinD.

I thought that you'd need to retune after fuel pump but now I understand you really dont need it.

Thanks for clearing that up.

 

Yeah I checked both Buschur and Ams require fuel pump upgrades before any tune is done...now i'm confused. Both sides make sence.

 

Well, both may be correct. You may not technically need the fuel pump to get flashed, but maybe Al and AMS have had enough problems with failing pumps after a flash that they decided to require the pump beforehand. I guess if your power went up with a flash and you had a less than stellar pump to start with, the dealer would get blamed for the problems associated with the faulty pump. Just a guess

 

you do need a pump for a flash.. I had my car retuned the other day and my stock fp is maxed out.. Up top im running out of fuel.. Will be installing a Walboro today and doing a retune

 

But do you need a flash for a pump. That is the question

 

Both are correct. Adding a fuel pump too early will do nothing for you, good or bad (see KevinD's explanation--all the extra fuel just gets returned to the tank). But not having it in soon enough can cause fuel starvation at high RPM's/boost/fuel demand. The can start to occur as soon as you change the boost profile (running higher peak boost, or especially running higher boost to redline). Having the pump in place at the time of the tune lets the tuner adjust boost, AFR and timing without fear of fuel starvation.

You do not need a flash for a fuel pump. But a fuel pump in place before the flash can allow the tuner to give you a more aggressive tune.

 

I cocur on the pump issue, the regulator on the rail is there for that reason.

I don't understand not tuning after upgrading FMIC. At very least you will see a drop in boost due to the larger (presumably, if "upgradded") interior volume.
Why wouldn't A/Fs change? With the huge variance of aftermarket ICs on the market can you generally state that you don't need to re-tune after adding an IC.

 

sorry but kevin D PWN3D the thread.

 

What KevinD says is true, but why do so many people who put a Walbro's in after a Flash run really rich then? Why does every single tuner out there tell you that you will lose a few horsepower when upgrading your fuel pump after a Flash?

Later

 

i would love to have a tuner chime in here and explain because i was under the impression that you needed a re-tune after a fuel pump also.

 

http://www.dynoflash.com/indttm.htm




Look at the 9th bullet... Dynoflash says you need a reflash after fuel pump install

 

i'm not going to bash al, but i can tell you straight up he is wrong. have him post here and explain his point. then i will tell him why he is wrong... i've done it in the past

 

On Evom.net? If so do you have the link?

 

Thanks everyone, but can I add an upgraded intercooler without reflash or adding a upgraded fuel pump? Currently my flash is awsome without upgraded fuel pump. Will simply adding an performance intercooler change the entire current flash/fuel maps requiring me to get a reflash and or upgraded fuel pump??