MADDSLOW

iTrader: (11)

Hey everyone, I've read a lot on common problems with an FD, and one of the leaders in the category is air/fuel ratio. After converting my turbos into a non-sequential mode, I'm very dissatisfied, as they don't BEGIN to spool until about 4500 rpms. My plan was to sacrifice low-end power for the mid power I was supposed to be getting around 3500, and now it just feels like all I did was remove the smaller turbo. So my plan was to free up the flow of the intake/exhaust and hopefully reduce the spooling time by adding a downpipe/midpipe and a foam intake( I already have an exhaust). Do you think the Walbro 255 HP will provide enough fuel to compensate for the extra flow of air SAFELY? And do you think my plan will help the spool at all? Thanks everyone for your input! ~Anthony

Mahjik

iTrader: (1)

The FD runs on a MAP system. So, it only knows absolute boost readings, not CFM.

So, if you are pushing more CFM at the same boost level, the ECU is not going to auto-compensate and add more fuel (hence programmable ECU's). So, adding a fuel pump isn't going do enough for you at the lower boost levels.

Having said that, *if* you can keep the boost level at 10 PSI; the stock ECU has enough fuel to support bolt-on mods and keep things safe. The tricky part can come into play when trying to keep the boost at 10 PSI.

MADDSLOW

iTrader: (11)

After converting the turbos, my max boost is around 8 psi, but when they first kick in at 4500 it spikes up to 12 momentarily, then immediately backs down. What would your suggestion be in this case, and would the pump be unneccesary?

Mahjik

iTrader: (1)

Your max boost is limited right now because you probably just don't have the flow to keep it higher. On a relatively stock car, the boost will trail off to 8 PSI as it approaches redline.

I fuel pump upgrade is a good idea once you start boosting about 12 PSI or above. There have been several recent tests showing the fuel pump having some issues at the higher boost levels. However, if you are just maintaining stock 10 PSI, an aftermarket fuel pump would just a mod "just to mod".

My suggestion:

Since you went non-seq, you are killing yourself without a free flowing air path (intake and exhaust). I would do this:

* Get an Electronic boost controller to control any spiking you might see
* Install the downpipe and catback but leave off the midpipe off for a bit
* Intake is up to you. There are modifications to the stock air box to pull in more air, or you can go aftermarket.

That should make a pretty big difference and keep you pretty safe for a while.

MADDSLOW

iTrader: (11)

Hmmm well I'll definitely go with the HKS RS intake and a downpipe, but isn't another common problem with the FD clogged cats? Maybe my research is wrong but I read a lot of people have this problem. Thanks for the last post that was very useful info.

Mahjik

iTrader: (1)

If you were having a cat problem, you wouldn't be seeing 8 PSI at redline.

Yes, clogged cats are always an issue but it doesn't sound like you have it (yet).

MADDSLOW

iTrader: (11)

Yeah I guess I'm getting ahead of myself and not worrying about the problems at hand, but I'm very uneducated in these cars and need help with EVERY question, so I'm always juggling ideas of what to do next in mods and how safe it will be. Thanks for taking the time. ~Anthony

Improved FD

midpipe and light weight flywheel are pretty much mandatory for non-sequential...but the midpipe will require plenty of fuel and good boost control

dgeesaman

iTrader: (7)

...and a ported wastegate.

Dave

Improved FD

oops...yeah, that too

mono4lamar

iTrader: (32)

anthony get some parts and drive over to my shop immediately!

MADDSLOW

iTrader: (11)

hey lantz didn't you say you were selling a flywheel?

mono4lamar

iTrader: (32)

lol sold it! its on a boat to greece as we speak! lol i told you to jump on it... call my cell or pm me i have connections on these forums for whatever you need! are we doin that bar this weekend?

MADDSLOW

iTrader: (11)

next week is actually better for me I'm all filled up for this weekend, you should have come over to this side of the river we were out til like noon.