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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 03-09-2005, 01:33 PM   #1
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Disapointing Dyno run today

I decided to do a baseline dyno run before I start to instal my MP Performance products and the results were not great!!! Torque was acceptable but hp was terrible.

Max Power: 134.4 @ 5250 RPM
Max Torque: 172.3 @3250 RPM

We did three runs and they were all identical. I figured I might at least get 150 hp if not more considering I have the Viggen intercooler, Viggen muffler, and the 3" intake mod with a K&N.
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Old 03-09-2005, 01:35 PM   #2
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wow that is kind of dissapointing..i wonder what happened for the results to be so low?
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Old 03-09-2005, 02:06 PM   #3
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WHAT!!!!!!!


There is a huge issue there. If this is your 1999 9-3 you should not be getting 134 HP!!! What car is this? And what is your complete mods list? Something has to be wrong here...
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Old 03-09-2005, 02:10 PM   #4
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It's a 185hp T5 9-3 manual, i test drove it before he bought it...it felt pretty good when i drove it, something must have gone wrong on the dyno...
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Old 03-09-2005, 02:14 PM   #5
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wow, that seems low. Put in some fresh plugs, clean the filter, and maybe see if you can scan for codes that might give you some insight.
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Old 03-09-2005, 02:15 PM   #6
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Yes this was my '99 9-3, so I need to figure out what is happening. The guy doing the dyno runs said I would boost to 15 psi but as soon as the RPMs start to climb my boost would drop below 10. He was very surprised as well as he use to drive a '91 9000 turbo and he felt my car should have higher numbers.

The list of mods to date are:
Viggen intercooler (about to be replaced with an MP Performance intercooler)
Viggen muffler stock exhaust (soon to be replaced with a MP Performance downpipe and exhaust)
3" intake mod with K&N ( to be replaced with a MP Performance intake)
MBC
Complete Viggen interior (just installed, and I like it a lot!!!)
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Old 03-09-2005, 02:17 PM   #7
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I was gonna say, since it s t5 your mods should be helping you GAIN power, not lose.

maybe the MBC needs adjusting or is not working right? if you have it set too high, is it possible that you're boosting TOO much for the stock software and your wastegate is opening at around 15psi to vent some boost? Because isn't that the fuel cut for stock SW, right around 15 PSI?

I really don't know if this is possible, just throwing out some ideas?
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Old 03-09-2005, 02:21 PM   #8
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My car did the same thing last summer, I put down like 164hp and 201 ft lbs, boost fell off sharp for me too.
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Old 03-09-2005, 02:28 PM   #9
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My car did the same thing last summer, I put down like 164hp and 201 ft lbs, boost fell off sharp for me too.
So did you figure out what caused the boost to fall off sharply?

As for my plugs and filter, they are all new this fall. And as Spray mentioned the car feels like it is driving well, I did have a CEL recently that was tracked back to what my mechanic calls a "lazy O2 sensor" but since the cose was cleared it has no re-occured. As for the MBC it will be gone as soon as I do the ECU upgrade, I believe the MBC can affect boost at higher RPMs and that is the trade off of liberating the boost in 1st and 2nd.
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Old 03-09-2005, 02:46 PM   #10
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Nope, I thought it had something to do with either the heat, or my manual boost controller....
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can be prone to failure due to increased localized stresses in the hole penetrations
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Old 03-09-2005, 04:35 PM   #11
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I'd bet it's the boost controller as well. Did you install the MBC because you were having trouble maintaining boost without it or did you put it in to give you more power? Also might not be a bad idea to check all hoses to make sure they are not leaking or cracked.
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Old 03-09-2005, 04:39 PM   #12
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If I have time I will go back and try again without the MBC, and we will see if there is any difference. As for hose, etc, they all seem to be in good condition.

Thanks
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Old 03-09-2005, 04:40 PM   #13
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Yea definately check them hoses mang.

Leaks in vacc lines and really affect performance.

Once I get home, I plan to replace all of my lines.
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Old 03-09-2005, 04:50 PM   #14
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I bet it was the MBC, or possibly my wastegate settings, I have no leaks.
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Old 03-09-2005, 04:59 PM   #15
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what's your base boost set at? it should be set around 1/2 max boost on a stock ECU. typiclly this is around 6-7 PSI.
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Old 03-09-2005, 05:03 PM   #16
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Quote:
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what's your base boost set at? it should be set around 1/2 max boost on a stock ECU. typiclly this is around 6-7 PSI.
according to my boost guage (aftermarket, not factory) I boost to 15 psi and then drop to below 10 psi. So you are saying this is normal with the stock ECU?
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Old 03-09-2005, 05:57 PM   #17
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no, what I am saying is that the waste gate actuator when the ECU is not acting on should be set around 1/2 your max boost with a stock ECU. that is, if your waste gate is set around 6.5 PSI, you should max out at 13ish. You can un plug the solenoid to check this on C-900's, I'm not so sure if this is the same for NG 900's. I know on TCS equipped 9000 models you can touch the brake lightly and floor it in 3rd gear and check the base boost. probably similar on NG's

I realize what I typed may be hard to understand... I tried to put it simply
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Old 03-09-2005, 06:19 PM   #18
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I tried to figure out the 9000 way, but don't think I got it to work..
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Quote:
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can be prone to failure due to increased localized stresses in the hole penetrations
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Old 03-09-2005, 06:53 PM   #19
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you think it might be possible that you had some realy shitty gas in the tank? that might hinder slightly but probably not the full problem
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Old 03-09-2005, 07:11 PM   #20
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I doubt it, out of all the cars at the dyno day, I think I was the only one packing a mbc.

Another car did experience the same boost drop off too. Maybe Gavin?
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