Hey fellas i just got a PFS PMS unit in my car and I cant seem to get back to the 10-8-10 boost pattern i had before putting it on. Its now something like 7-5-7 (plus or minus 1 psi) no matter what setting its on. (low 10psi ,med 12psi ,high 14psi) At idle it seems like less exhaust is coming out of the tail pipe so i may have a clogged cat, but that could just be in my head. I have good vacuum around -17 so i dont think i have a leak. If it isnt a clogged cat what else could it be?

Anyway if in fact the cat is clogged is there any reason for me not to get a midpipe?
i dont have to worry about emissions, my airpump is disconnected, and as i said before i have an ecu to compensate for the extra boost. Another plus is a midpipe is cheaper than another high flow cat. Thank you for the help and input.
-stephen

 

What happens when you take the PMS back out? Back to 10-8-10?

A midpipe might cause boost creep to a level uncontrollable by the PMS (wastegate full open and boost continues to climb).

I'd be awfully careful with 14psi and a stock fuel system. Actually, I wouldn't do it.

 

what should the "high" setting be on with the stock fuel system? i havnt boosted above 7 since i got it so nothing has been overworked, so i should fix the problem before it becomes one. ill disconnect the PMS in a few minutes after i eat lunch and let you guys know what happens. If anybody has any suggestions in the meantime, please let me know.
-stephen

EDIT: relevant mods are
apex power intake
downpipe
exhaust
high flow cat
autometer boost gauge which reads the same as the PMS boost gauge.

 

i know its a pain but take that sucker out and see if its normal again

The highest I would run on the stock fuel system is 13 if you have just had the injectors cleaned. If you are unsure of the shape then maybe do 12

Also, theres been a lot of argument if you need a fuel pump to run more than 10psi. Some people say it is maxed out at 12psi other say the injectors will max out before the pump. I've never had a wideband or been on a dyno so I have no idea. So of course to be safe I got a supra pump before going above 10psi.

-Snook

 

I have run at 12 with the EFI PMS and a stock fuel system. I keep it at 10 normally, as I still have the stock intercooler. Once (if) I finish my IC installation, I'll run 12 on freshly cleaned injectors.

 

so basically 10 psi low, 11psi mid, 12 psi high? i still need to pull that damn thing out, ill give you guys an update when i do.
-stephen

 

I go 8,10,12, but that's your call.

I know there's a lot of criticism of the EFI PMS, but it works quite well for me. I'd prefer the non-stock injector control and resolution the PFS offers. Then I could run 1600 secondarys/bigger fuel pump/my future IC and up the boost a bit.

 

yeah with the stock intercooler 12psi is the MAX and I mean max because 10psi is really the max you should do.

I never took this seriously until one day when I put my boost gauge onto the y pipe to see how much boost was lost when it goes through the intercooler. My boost gauge was reading near 14 but the engine was getting only near 12.

be safe good luck

 

I want to second what johnchabin said about running with a midpipe. The PFS PMS works well with the stock sequential system with a cat BUT I think every complaint about it results from adding a midpipe. You get a lot of boost at transition.

By the way, I run 12 lbs on the street with pump gas and as high as 16-17 on race gas. My maps were done on the dyno by Peter Farrell and Ray Wilson & that is not the same as what comes built-in on the PMS.

You need to see if you can get the three base maps from Farrell. Unless you bought it new, there is no telling what a previous owener might have done.

 

I wouldnt run 13psi with stock fuel. Quick question about the PMS though. I have been researching and I CANNOT run 1300cc sec. injectors, correct? But I could run 850cc primaries and then have enough fuel for 13psi?

 

I may be testing out the 850cc primarys & 1300cc secondarys with the PMS. The ratio is about the same as 550:850.

Unless you want to test it first...

 

I'd talk to Wade before upgrading injectors on the PMS.

 

I changed my mind...I wouldn't change injector size, but what you're saying about the ratio, sounds crazy enough that it just might work.

 

I got this ratio idea off Wade's site...

It makes sense to me that it could work.

 

if you decide to test this I would love to hear the results/experiences

keep the board posted

 

What revision of the PMS did you installl? If it has a selection for the number of turbos under menu 900 then it is the latter version and it's boost control is very good. If you are seeing low boost set the max boost to the desired target and set vent learn to Y and take it out somewhere you can run the 3rd gear boost test at WOT and the PMS will adjust its vent table up to the target boost level. I am running a DP, HF Cat and a cat back and the PMS is controling boost to 12lb on both trubos. Without the PMS it was spiking to fuel cut every time I went WOT. In case it makes any difference I have the new RZ ('99) twin turbos on this car.

 

I have to pull the UIM to investigate my emissions problem. I'm planning on sending the injectors in for cleaning & flow testing, at which time I will consider the 850cc:1300cc upgrade (along with other fuel system upgrades).

Problem is if it doesn't work, I will have to buy a PFS to get it running. More $$$ and even worse, more time that I don't have... I'll keep you posted.

 

Buy a PFC, right?

I pretty much decided I wouldn't upgrade fuel until I bought a PFC...but then I'd be getting into the grey area of new clutch, better brakes, upgraded twins, etc...basically a new can of worms.

DAYEM, I need to stop reading this forum and getting idea's from you people....YOU GUYS ARE INSANE!!!!!

 

NOONE at all has tried the 850:1300?

Does Wade even post on the forum?

 

SWILSON you have a PM.

 

Wolfie - I didn't get the PM.
If you want to contact me directly my email changed. It is now stevewilson@maximus.com

 

I see from his sig that Immanuelrx runs the 850:1300 ratio with the PFS Purple...