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3 Bar FPR on a 951 Pros and Cons?

ChasR

ChasR

New member
Right, all is fairly well on my Turbo, except one small issue- it was said to be running quite lean at the 944 dyno day. AFAIK I do not really know the spec of this car, bar a few things which include:

It running on enrichment chips
Boosting at around 1 Bar (the dyno chap thought it went to 15PSI at one point although the graphs say it went to 0.95)
Bailey DV30
Wortec exhaust.
It made 283BHP at Surrey Rolling Road

One avenue I was considering was to fit a 3 Bar FPR (AFAIK it currently has a 2.5 Bar FPR). My question to you is whether there are any drawbacks to fitting a 3 Bar FPR to a mildly tuned Turbo, be it come emmisions time, horrific MPG, dodgy idle and other situations. Bar the lean running the car actually behaves quite well :).
 
My advice would be to fit a wideband lambda and AFR gauge along with a KnockLink det alarm. Before you change anything YOU need to REALLY KNOW what is happening and when.

Turbo cars and overfuelling is safe, but the closer to stoich you get, the more paower you make, although you will run hotter and with far less margin for error.

If everything else is working properly then Id probably be considering water & methanol injection. Not particularly expensive and itll probably pay for itself in saved fuel before too long. Water is a lot cheaper and better suited to keeping the charge cool than SUL is...
 
This is the ex. Andrew Sweetenham car isn't it?

I'd have a word with Promax who probably know exactly what's on the car. If the chips are for a 2.5 bar FPF then a 3 bar FPR is a bad idea. Might be easier to just tweak the FQS switch on the ECU (DME) if that will work with the Promax chips.


 
If it's been running properly (which if it used to be Andy's it certainly will have been), and now it's running lean, and you don't know why, changing things at random in the hope that it will run perfectly is *almost* guaranteed to backfire.

You need to get to the heart of what's changed. FPR could be failing, maybe. Or the fuel pump starting to get tired. Or you might have a clogged or weak injector. Or something might be leaking. Or probably other things I haven't thought of.
 
What colour is your current FPR?

Not a foolproof method, but the standard 2.5bar is copper coloured and the 3bar is black.

I'd be surprised if you still have a 2.5bar if your cars already been tweaked.
 
It's on a silver coloured FPR.

Whilst it may have had a 3 Bar FPR on once upon a time bear in mind the car has been through another owner before it came to me :).
 
I thought you was selling Chas'? Changed your mind huh? Or is it because like me, no one wants to buy the bl00dy things!! Never mind, there is a solution, the path that I will probably be embarking on. Chuck a fcuking great wedge of cash at it and turn it into a Ferrari eating, fire breathing MONSTER!!![8D][:mad:][8D].....[;)][:D]........You know it makes sense.
 
I am more towards not selling it now Pete :). At the time the daily I had was giving me far more grief than any car should, so I was going with the 'what is easiest to sell first' approach (as I did with my last 944).

My car ATM is quick enough for me (in the bends at least anyway!). Going quicker as much as I would like to would make me even more fearful of my licence (I do not need a Level 2 kit, do not need...).

FWIW the car on boost had an AFR of 13:1 rising to 14:1 with it running on SUL :).
 

ORIGINAL: ChasR

FWIW the car on boost had an AFR of 13:1 rising to 14:1 with it running on SUL :).
Click to expand...

That is very lean for a 944T on boost Chas [:eek:] If you don't get that sorted you will blow that headgasket before too long [:(]

Ideally you don't want to go higher than 12:1 once full boost has been reached.

Can you post a scan of your AFR log? If you are lean everywhere then it does sound like the previous owner has removed the 3 bar FPR for some reason and replaced it with a standard 2.5 version. Sandy (U63af) has a used 3 bar FPR going cheap if you need it, or they are only £70 delivered from Promax
 
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