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Chim55117
10-18-2009, 01:44 PM
I've recently decided to bump my injectors from FIC 650's to PTE 850's, and was wondering if I "need" an FPR to regulate the additional fuel, as the current tune is compensated for the 650's. I have DSMLink as well.

I really want to know if I want to go to MAP to retune the car, if they can just adjust the fuel via DSMLink, and everything will be fine, or if I need an FPR for the increase in fuel and an adjustment in my DSMLink tune.

Thanks in advance for your advice.

- Stephen

http://photos-g.ak.fbcdn.net/hphotos-ak-snc1/hs257.snc1/10435_298219640606_685700606_9167056_2588729_n.jpg

http://photos-e.ak.fbcdn.net/hphotos-ak-snc1/hs257.snc1/10435_301378865606_685700606_9203439_3295535_n.jpg

http://photos-g.ak.fbcdn.net/hphotos-ak-snc1/hs257.snc1/10435_304080435606_685700606_9248964_6540074_n.jpg
viridionplague
10-18-2009, 02:01 PM
an aftermarket FPR is not needed for bigger injectors, it is needed if you get a larger fuel pump, bigger than 190, to prevent the fuel pump from over running the stock fpr.

so all you need to do is adjust your injector deadtime, and global fuel in dsmlink to run the larger injectors
Chim55117
10-18-2009, 02:09 PM
Alright! Thanks!

I think my Supra pump is less than 190LPH. I hope...
viridionplague
10-18-2009, 06:34 PM
i think the supra pump is over 190 but under 255, and it seems that for the 255 the AFR is recommended, but i think you should be fine with the supra pump
blackrosenova400
10-18-2009, 06:57 PM
Actually if you look here at the flow chart, the supra pump flows more than the Walbro 255 (GSS341).
Chim55117
10-18-2009, 08:33 PM
AFR would be recommended then?
blackrosenova400
10-19-2009, 02:04 AM
Yes you must get one or you will run very rich.
jrohner
10-19-2009, 03:43 AM
Adjust the global & deadtimes, and go!
C3L1CA
10-19-2009, 01:17 PM
Keep the stock one.
blackrosenova400
10-19-2009, 03:07 PM
How can you tell him to keep the stock one?

The correct way to do it is to install a fuel pressure gauge, install the pump and watch fuel pressure at idle. If its too high the regulator has been overrun and will need an aftermarket regulator. Adjusting the global will set the tune correct at low loads until the injectors are opening enough fuel to the engine where flow is reduced and the regulator can finally keep up. when that happens, you are now running lean because the global is backed off. You can tune it out but it is just masking the problem.



Keep the stock one.