[bobsaab]

I am a MY 2000 Aero at MapTun Stage 4+. My tuner, after I asked, said no FPR necessary.

However - a couple of times on various threads it has been mentioned that this is recommended at the 300 HP level.

Guidance/comments gentlemen please.

 

[xxxxxxxxxxxxxxxxxFinn]

I am a MY 2000 Aero at MapTun Stage 4+. My tuner, after I asked, said no FPR necessary.

However - a couple of times on various threads it has been mentioned that this is recommended at the 300 HP level.

Guidance/comments gentlemen please.

Bob, both Chris and I run with the higher FPR and we are both a little under 300bhp, I think there is one tuner that recommends the higher FPR whilst the others dont mention it. I have been experimenting with both FPR's over the last few months. I first questioned the FPR after a dyno result that I had that was maybe just a tiny bit lean at WOT. I spent some time with the Abbott tuner and we couldnt get any really conclusive results to prove that there was an advantage to using it. However my experience is as follows. Using the higher rated FPR does lead to a little carbon build up whilst cruising around town, but this clears the first time that you put your foot down. My feeling is that strangley I appear to get a slightly better mpg when using the uprated one I have no idea why. Also the car does seem a little quicker on the throttle at over 5000 revs, I guess the car isnt struggling at all to get the fuel in. I know I have no proof but its just a butt on seat feeling. The other major advantage is that you arnt going to lean out, particularly at WOT in higher summer temps.

Consiquently I cant really recommend either way to its advantage or disadvantage, gut reaction is that it certainly doesnt do any harm ! Surfice to say I feel happier with the higher rated one and should I ever feel the need to try and squeeze any more power out of my little engine then the FPR wont be a problem.

 

[Chris 9-5]

Nordic certainly require it:

T7 3.5 Bar Fuel Pressure Regulator

http://www.genuinesaab.com/catalog/images/fuelregulator.jpg?osCsid=c95e4ce6215772b33927eedfee01405d3.5 Bar Fuel Pressure Regulator Can only be used with corresponding modified software. The extra fuel pressure allows for better spray patterns and power at high output levels. Will not affect daily fuel mileage. Only for use with special Nordic software.

 

[bobsaab]

Nordic certainly require it:

Yes I saw that which was why I was questioning Maptun not requiring one.

Would installing one require a remap of my software? If so, the $100 item just became a tad more expensive....

 

[ricot83]

u can get a spare one for free, or even used and crush it like here http://www.lehigh.edu/~cak7/Upgrades/Stage3/ViggenTurbo.html

i am going to crush one of my spare ones 0.1 inches, to make about 3.5bar

correction .0851 inches is the correct amount to crush it. to make it 3.5bar

 

[Chris 9-5]

Erm............................crush it


Is that the technical term?

 

[ricot83]

u take a sokcet that is about the diameter of the inside of the regulator, and u put it in a vice very carefully tightening... not so hard. Just a better alternative to spending $100 on something u can make... if u hadn't noticed i make most of my own stuff, anything within my own power that is. it has saved me over $2000 in parts thus far.

 

[Chris 9-5]

Make me a Lambourghini please :cheesy:

 

[Chris 9-5]

To my knowledge none of the other main tuners suggest an uprated FPR, however none of them sell a lot of Stage 4 and above I guess, we copied Nordic's example when we mirrored their FMIC and open air filter set up

 

[ricot83]

Chris i think uprated your fpr was a smart idea even though the tuner didnt suggest it themselvees, sometimes u must make desicions based on others. such as nordic suggesting that fpr.

 

[bobsaab]

Well, crushed or new - software remap required?

 

[Kermit]

Seeing as your running Maptun software Bob, i suspect an e:mail to Maptun wouldn't go amiss. I suspect they will say not needed, but best confirming this.

 

[Chris 9-5]

Sorry Bob, back to the point ;oops:

I emailled Speedparts and told them my new hardware spec as I have their stage 4 and they thought that the map would adapt nicely on its own, so didnt want to sell me anything further in terms of mapping.

The differnece with the FMIC, FPR and open air filter is dramatic without any software re map in my case.

Nordic however plan to exploit this even more hence their suggestion that their ECU wiill produce almost 300 bhp and 420 Nm

 

[ricot83]

Chris further illustrates a point of mine :cheesy: :lol:

 

[Raven18940]

Nordic however plan to exploit this even more hence their suggestion that their ECU wiill produce almost 300 bhp and 420 Nm

300 hp through a saab autobox, you're brave.

I'm interested in seeing how my stock aero would behave with an uprated FPR. Would the T7 actually adapt to something like that?

 

[ricot83]

Eric formerly from MP PERFORMANCE said Frank STromvqist (sp?) told him there is a 25% range of fuel change built into the Ecu prgram, so it essentially should not ruin anything since the car decides how much fuel it will dump regardless, the 3.5bar just raises its limit as to how much the max fuel is.

 

[Chris 9-5]

300 hp through a saab autobox, you're brave.

Ah with this in mind Nordic have detuned the ECU from 340 bhp to 297

Plus I wanna see how fast Wessy can do an auto to manual conversion when I melt it :cheesy:

Regarding T7 if the amount of fuel required is regulated anyway I cant see that an uprated FPR can hurt, surely T7 would just adapt the injector timing accordingly ................. but then again, if a stock aero needed it, saab would have fitted it I guess

 

[ricot83]

o ya in regard to the auto box blowing up.. i also have one just for the record HP will not blow a tranny torque will.

 

[bobsaab]

Sounds like dropping one in won't hurt but I will choose the cautious route and email MapTun for their take on this - and wait the usual 4-5 weeks for a reply...

I'll post it when I get it - thanks gents and now back into your cells you heathens...

 

[Vigge]

o ya in regard to the auto box blowing up.. i also have one just for the record HP will not blow a tranny torque will.

Its not the bhp that will kill your tranny, more like the torque "behind" a certain bhp, which of course is dependant on RPM
.
For instance, if we want to play it safe with the autobox, limit torque to 350Nm (260lb-ft) and you "can" have the following bhp
rpm/torque/bhp

2500 260 123.7623762
3000 260 148.5148515
3500 260 173.2673267
4000 260 198.019802
4500 260 222.7722772
5000 260 247.5247525
5500 260 272.2772277
6000 260 297.029703
6500 260 321.7821782
7000 260 346.5346535

​

​

​

raise the limit to 400Nm (295lb-ft) you will see
2500 295 140.4226961
3000 295 168.5072353
3500 295 196.5917746
4000 295 224.6763138
4500 295 252.760853
5000 295 280.8453922
5500 295 308.9299315
6000 295 337.0144707
6500 295 365.0990099
7000 295 393.1835491

in the end it a guestion of RPM how much bhp can safely be moved trough the autobox.

my 0.02