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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 08-01-2007, 02:50 PM   #1
Nick Taliaferro
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Fuel pump... ;)

This was at moderate power, 250ish at the wheels but breaking up on the big end.. Think we found why. Boost press (ManP) biases fuel pressure (labeled Oil P) You can see that the fuel pressure is fine till the load comes on.



Good thing we keep the upgrade Walbro pumps on hand. This one was apparently original at 130K. I didn't get any pictures of that.. Little busy.

The real interesting part is that the A/F ratio was good. Just too much calculated opening and a misfire.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 08-01-2007, 03:01 PM   #2
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All this cool research.....
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Old 08-01-2007, 08:40 PM   #3
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What turbo is on that Saab? 20 psi at 5000 rpms seems late for boost. What was the power level with the new pump?
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Old 08-02-2007, 05:36 AM   #4
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The power was around 311 on that run. (92f ambient) We are no where near the limit of the turbo just working up to full boost as time permits. It is optimized for on out in the rev range.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 08-02-2007, 05:47 AM   #5
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Very interesting graph! Made me a bit paranoid... Since my daily driver is getting to 95kmi on the OD....

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Originally Posted by GenuineSaab View Post
Good thing we keep the upgrade Walbro pumps on hand.
How much do these upgraded pumps cost? Are they overkill for a stock car?
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Old 08-02-2007, 07:41 AM   #6
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Very interesting graph! Made me a bit paranoid... Since my daily driver is getting to 95kmi on the OD....



How much do these upgraded pumps cost? Are they overkill for a stock car?

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Old 08-02-2007, 10:16 AM   #7
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If he's referring to a 255 then there are 2 types which can be had on the internet pretty cheap. Only he and others can tell you how to mount it though.
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Old 08-02-2007, 12:20 PM   #8
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Upgraded forge wastegate actuators too? too many cool toys down in springfield...
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Old 08-02-2007, 12:53 PM   #9
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The Bosch motorsport pump is a better choice than the walbro, will keep the flow even with high fuel pressures. This will not play a role if the turbo is std, but will eventually turn into a problem when the car is run with a much bigger turbo.
http://www.jayracing.com/images/Bosc...lbro_255HP.JPG
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Old 08-02-2007, 01:56 PM   #10
 
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The Bosch motorsport pump is a better choice than the walbro, will keep the flow even with high fuel pressures. This will not play a role if the turbo is std, but will eventually turn into a problem when the car is run with a much bigger turbo.
http://www.jayracing.com/images/Bosc...lbro_255HP.JPG
+1...

Only thing I'd add is that the 255 is fine as an OEM replacement, and can handle moderate mods pretty easily. It also fits into the tank carrier assembly without modification, which will save some dough. For most applications, it should be fine.

But any application that requires significantly more fuel flow at the high end should probably go with the Bosch Motorsports "044"
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Old 08-03-2007, 07:56 AM   #11
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Where can you find the bosh unit?
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Old 08-03-2007, 08:04 AM   #12
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Where can you find the bosh unit?
Ditto on that one!
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Old 08-03-2007, 09:19 AM   #13
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You have to watch out there are lots of counterfeit pumps out there.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 08-03-2007, 09:19 AM   #14
 
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It's pretty available and known mostly by the "044" suffix. That's the last three digits in the part number. It's also used by Porsche in some applications (the 993/996 I think...)

EDIT: Ditto on the counterfeit pump advice....I bought mine from a place in Miami about three years ago, but there were a couple of online vendors selling them about $40 cheaper than anyone else, even with shipping from Singapore.... There were a couple of great posts on an Aussie enthusiasts forum warning people to watch out for fakes.

Last edited by mike saunders; 08-03-2007 at 09:22 AM.
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Old 08-03-2007, 09:40 AM   #15
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Quote:
Originally Posted by mike saunders View Post
It's pretty available and known mostly by the "044" suffix. That's the last three digits in the part number. It's also used by Porsche in some applications (the 993/996 I think...)

EDIT: Ditto on the counterfeit pump advice....I bought mine from a place in Miami about three years ago, but there were a couple of online vendors selling them about $40 cheaper than anyone else, even with shipping from Singapore.... There were a couple of great posts on an Aussie enthusiasts forum warning people to watch out for fakes.
What identifiers can you use to verify a legit one..?
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Old 08-03-2007, 09:45 AM   #16
 
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Honestly, the best prevention I can think of is buying it from a trusted seller.....
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