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Old 03-26-2003, 12:20 PM   #1
Opie
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Lightbulb Dyno numbers from this morning...whatcha think?

Well, I got the car dyno'd this morning on my dealer's (Mastro Subaru, Tampa, Florida) new DynaPack dyno! Here's the details on my normally aspirated 2.5L RS:

Test Conditions:
Temperature : 82.3 Degrees Fahrenheit
Relative Humidity : 52.2%
Barometer : 30.1
Altitude : C'mon its Florida +/- Sea-level

Fuel Used : 87 Octane Citgo Pump Gas

Cars Power Modifications:
Cobb Intake w/PRM Filter
Borla Gen. 4 Headers
Random Technology High Flow Catalytic Converter
SPT / Brospeed Exhaust w/Mid-Pipe
GFB Lightened Pulley Set

Results:
Peak Wheel Horsepower (Power Corrected HP SAE): 139.5 HP @ 5669 RPM
Peak Torque : 141.0 ft. lb @ 3800 RPM

Pull #1 : 137.2 HP @ 5321 RPM
Pull #2 : 137.3 HP @ 5322 RPM
Pull #3 : 138.6 HP @ 5364 RPM
Pull #4 : 139.5 HP @ 5669 RPM

Estimated Crank Horsepower : 188.3 HP @ 5669 RPM

I'm Pretty pleased with the results, further tuning will include some type of engine management and the use of higher octane fuels. My car showed that peak HP was maintained for about 300 - 500 RPM consistently across all 4 runs. It seems that I should be shifting between 5300 & 5600 RPM to get full use of all the power being made, past that the HP starts to drop off.

I think I'll put the RS on a diet next...lightweight hood, bumper beams...etc. Won't increase my HP...but it will make the HP I've got more effective!

The rest of you that have dyno'd your RS tell me what you think, repectable? I hope to get the graphs scanned today so I can post them.
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Last edited by Opie; 03-26-2003 at 06:12 PM.
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Old 03-26-2003, 12:33 PM   #2
JohnP555
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Hey man, nice information

I have been wanting to put my car on a dyno for a while. Interesting to see that those modifications look to gain about 20-25 hp from stock. Sounds about right. What would be real interesting would be if you tested each part individually to find what had the most gains....but that is way to much work, lol.

I like your thinking as far as the lightweight parts. The lighter you make your car the more efficient it is plus the better it will handle. Go for it.
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Old 03-26-2003, 02:22 PM   #3
Keiho
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Yup, my car did about that on a dynojet in fwd mode. Can't compare the two yea, but at least they're similar.
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Old 03-26-2003, 02:43 PM   #4
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sweet looks good....

my car is (will be in two weeks) set up very similar to yours.......thats very very good news!!! THANKS

spt
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Old 03-26-2003, 03:28 PM   #5
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Quote:
Originally posted by spt_impreza
sweet looks good....

my car is (will be in two weeks) set up very similar to yours.......thats very very good news!!! THANKS

spt

Same here, I also have the ProECM, but only a PDM (stage 2) intake and no high-flow cat.

But still, im guessing about 185 at the crank which isnt too bad.
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Old 03-26-2003, 06:08 PM   #6
Opie
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Here's the graph:
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Old 03-26-2003, 07:56 PM   #7
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Where'd you get the GFB Lightened Pulley Set? How much did it run ya? Also, could you tell much power difference from it?

Thanks,
Scott

PS- Nice numbers, I'm shooting for something around there...
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Old 03-27-2003, 08:33 AM   #8
Opie
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Lightbulb

I got the GFB Pulley Set from Mastro Subaru. I got the set intended for the WRX, it doesn't come with the Power Steering pulley but fits fine. I didn't want any loss of "feel" in the steering so I got the 2 pulley set (Crank & Alternator). It was less than $200 including the belts. If you want the 3 pulley set ((Crank, Alternator & Power Steering) they can get that too.

Last edited by Opie; 03-27-2003 at 08:38 AM.
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Old 03-27-2003, 09:27 AM   #9
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Quote:
Originally posted by Opie
I got the GFB Pulley Set from Mastro Subaru. I got the set intended for the WRX, it doesn't come with the Power Steering pulley but fits fine. I didn't want any loss of "feel" in the steering so I got the 2 pulley set (Crank & Alternator). It was less than $200 including the belts. If you want the 3 pulley set ((Crank, Alternator & Power Steering) they can get that too.
I was under the impression the 2 pulley set was for the new age... I'll try to find my dyno chart... It was like 131whp and 138-9 ft/lb... All I had at the time was Cobb intake and ProECM...
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Old 03-27-2003, 10:10 AM   #10
Opie
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Quote:
Originally posted by DanzBorin
I was under the impression the 2 pulley set was for the new age... I'll try to find my dyno chart... It was like 131whp and 138-9 ft/lb... All I had at the time was Cobb intake and ProECM...
It is, but the 2 pulleys are the same as the ones included in the 3 pulley kit, it's just missing the PS pulley. Apparently the PS pulley on the new age cars is pressed (not bolted) on, so swapping it is not real easy. I didn't want any loss of PS performance that "could" have happened with the lighter pulley in the 3-pulley kit.
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Old 03-27-2003, 10:34 AM   #11
Kevin Thomas
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Default Nice!

Nice dyno runs!

Wish there was an air/fuel ratio graph to look at as well.

What I'm wondering is how did you get rid of that hp/torque loss between 4000-4500rpm that is notorious on Subarus? As a matter of fact, you managed to turn the hp/torque drop to a gain and then it drops back to 'normal' right around 4500. Even my XT6s hp/torque curve is like that.

Do you have any idea what mod(s) got rid of that dreaded hp/torque 'dip' that's usually between 4000-4500rpm? I've read in other threads about it but forgot what they were. Thanks!
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Old 03-27-2003, 11:53 AM   #12
Opie
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Quote:
Kevin Thomas - Nice dyno runs!
Thanks!

Next runs will have the A/F ratio included. I would've had it done yesterday but they didn't have the "bungs" to screw the sensor into yet.

I have no idea which particular mod (or combo of mods) helped the usual loss around 4K RPM. I remember when the car was stock it did have the hesitation around 4K but I couldn't pinpoint when it went away. The car has over 67,000 miles on it and has the SOA ECU reflash that Subaru issued the recall for last year. I've run 87 octane almost exclusively, I put a tank of 93/93 in every 20 - 25 fill ups.

I run the NGK V-Power plugs that are recomended in the owners manual, Mobil1 10W30 oil, Purolator Fuel Filters, Amsoil GL-5 Gear Lube and Dexcool Coolant.

Otherwise it's just like it came from the factory. Engine internals: stock, Injectors and fuel delivery: stock, throttle body: stock.

Here's a link to all my mods: http://home.earthlink.net/~opiewho1/RS.htm

I've never 1/4 mile'd the car but at SCCA ProSolo events I would regularly pull 1.9 to 2.1 60 ft. times that people tell me are pretty fast. Who knows, maybe I just got a car built on a Wednesday!

Even the tech that dyno'd the car said it was an unusually strong motor , Who knows?

Wish I could offer some more help.
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Old 03-27-2003, 06:27 PM   #13
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Default Re: Nice!

Quote:
Originally posted by Kevin Thomas
What I'm wondering is how did you get rid of that hp/torque loss between 4000-4500rpm that is notorious on Subarus
How can you tell that he didn't have a torque loss? I don't think that graph shows torque. The left side of the graph says Power Correction Ratio, and the numbers are all 1.0xx. They only showed that ratio and the HP. It would be nice to see a graph of the torque, though...
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Old 03-27-2003, 08:16 PM   #14
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Default Re: Re: Nice!

Quote:
Originally posted by BugBomb


How can you tell that he didn't have a torque loss? I don't think that graph shows torque. The left side of the graph says Power Correction Ratio, and the numbers are all 1.0xx. They only showed that ratio and the HP. It would be nice to see a graph of the torque, though...

Um, there are two bars. One is HP (the green one) and the other is torque (the blue one). Since theyre within the same range, they are both on the same graph. The numbers on the side don't only stand for HP, they are just the scale of the graph.
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Old 03-28-2003, 07:52 AM   #15
Opie
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DDman is correct the blue line near the top of the graph is torque. There are actually 4 graph lines on the page, the ones you can see are the peak run. There is also a lighter set of lines that didn't show up in the scan that show the very first run. The first run graph is very similar to the peak graph although it does show a slight "bobble" in HP between 4000 & 4500 RPM, but it's very slight.
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Old 03-28-2003, 08:39 AM   #16
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Default Re: Re: Re: Nice!

Quote:
Originally posted by DDMan
Um, there are two bars. One is HP (the green one) and the other is torque (the blue one). Since theyre within the same range, they are both on the same graph. The numbers on the side don't only stand for HP, they are just the scale of the graph.
I must disagree. Take a closer look at the graph. 3 good reasons that the second line is NOT torque, but it is similar to what the torque curve would look like.

First, HP scale is shown on the right side of the graph, from 77 to 139 HP. It says "Power Correction HP SAE" on that side. The left side of the graph is not numbers that would represent torque. If the torque was selected to be shown on the graph, it would most likely have the same numbers on that side as the HP side. Also, the left side of the graph says Power Correction Ratio. the right side of the graph also has a list of available graphs. Notice that PowCorr (HP), and P/PC (Ratio) are selected to display, but NONE of the torque graphs are selected.

Secondly, If we are to assume that the other line is torque, then it must follow the same numbers as the HP side, correct? That would mean that his torque starts and ends at about 127 lb-ft. correct? That sounds fine and all, except that when you display HP AND Torque on the same graph and use the same lines to represent the same values then the lines MUST cross at 5252 RPM. Anyone that does HP calcs or looks at dyno sheets will see this trend. It's used in the equation, and it shows on the graph every time. In this case, however, the lines cross far before that point.

Thirdly, the line that you assume is torque is definitely the ratio between the power and the corrected power. It's all there on the right side of the graph. The data for Lap4 says the Power is 76.4 and the engine is currently at 2996 RPM. Multiply the Power by the correction ratio (currently displayed on the graph) of 1.03422 and you get the current Power corrected to 79.0 HP. If you try using the displayed graph as torque, and use the HP scale on the right to judge the torque, you can try the conversion equation all you want (HP = Torque*RPM / 5252) but you will never come up with the displayed HP number for any of the RPMs, because the other line is not torque.
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Old 03-28-2003, 01:45 PM   #17
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I don't know if this picture will work, but I plotted the actual torque curve in dark blue using the proper equation. It's an approximation since I only calculated it every 250 RPMs, but it gives you a general idea.
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Old 03-28-2003, 03:31 PM   #18
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I dunno Bugbomb....Coming from the source himself who did the dyno runs.

Maybe he could call up the dyno place and ask.
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Old 03-28-2003, 09:48 PM   #19
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Hi,
Can anyone tell me about how much hp should gain from these mods: short ram intake, torque chip II, and a Mrjosh pulley?
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Old 04-01-2003, 06:54 AM   #20
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i can get RS carbon fiber hoods for $550
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Old 04-05-2003, 01:53 PM   #21
Kevin Thomas
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Quote:
Originally posted by BugBomb


I don't know if this picture will work, but I plotted the actual torque curve in dark blue using the proper equation. It's an approximation since I only calculated it every 250 RPMs, but it gives you a general idea.

Thanks Bugbomb for posting your graph. I just read this thread again today. The the above dyno kind of threw me off. What i found strange is the torque 'curve' on the high side. It's almost flat yet you see the horsepower falling off. If a torque curve stays flat or almost flat, you'd be seeing the hp climbing into the stratosphere all the way off of the graph, not falling at the end like you see. Your blue line makes more sense since the torque curve steeply falling off would explain the hp falling off at the end.

BugBomb,
Do you think you could also plot say a red line that would correspond to the 'light blue' line? I know it's not a typical Impreza torque band but just put up one to see a 'what if' picture.

Last edited by Kevin Thomas; 04-05-2003 at 01:59 PM.
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