Alot of people have asked to see dyno charts of my results with the Piper Rally cams I picked up from Mark at Quantum (http://www.quantum-racing.com/). There was no AWD dyno in my corner of the world when I first bought and started modding my Evo, so I picked up a G-Tech Pro Comp and used that to collect baselines and compare upgrades.

The chart has data for four different runs:
Main Run - Stock Evo
Comp Run 3 - Vishnu XEDE, reflashed ECU with XEDE Flash, and standard 3" turbo back exhaust with a "stock" 93 octaine stage 1 map
Comp Run 1 - Above, plus Piper Rally cams, Ferrea valve springs and retainers, Vishnu cam gears, Walbro 255 fuel pump and a K&N Typhoon intake
Comp Run 2 - Same as run 1

The quick summary is:
Stock - 212 HP / 211 Torque
Vishnu Stage 1 - 248 HP / 240 Torque
Vishnu Stage 1 + Piper Cams - 276 HP / 255 Torque (G-Tech) or 286 HP / 266 Torque (Uncorrected Mustang dyno)

Important notes: While runs 1 and 2 show some good gains, they aren't completely accurate. The car was "missing" off and on when I did them and furter testing has shown my head gasket is on the way out. Guess I shouldn't have skipped the head studs...

When the car was running right the bottom end torque felt much better than it does right now. Run 1 hints at better torque, but you can see where the car is falling off; when running right the car definitly had more low-end kick. The HP curve in run 2 looks OK, but again, the car was missing and felt noticeably slower than it did when running right.

The second pic is from some tuning I did earlier on a Mustang dyno (when the car was running right) that shows peak HP at 6000 rpms, and a fat torque peak from 3700 to 6000 rpms. The numbers from the Mustang are uncorrected with 4th gear pulls. The first (lower) pull is with my cams set to 0/0; the second (higher) is with my cams set to +1 exhaust / -3 Intake. The late start on the second run was me not mashing the gas right away.

So why did I post plots with a dying head gasket? Because if I need to take the head off anyway, I'm hoping to have the head ported and larger valves installed. (now all I need is a vendor who's looking independent for before and after plots of their ported head. ) So how did I kill the head gasket? The two hard track days I spent road racing probably did most of the damage. Sorry I didn't get a plot of the cams when the car was running right.

Here's the pics:

 

Very interesting. You're vishnu stage 1 results are very close to my current Works modified car. (see mods in sig.)

What gear are you doing your Gtech runs in?

I have a Gtech pro comp too. despite what some people say about these things on the boards, my results have been pretty darn consistent. Your numbers with the Gtech vs the Mustang dyno are particularly interesting. If you were to do the correction for aerodynamic drag, the numbers between the two would be almost identical!

 

thanks for posting your results, now it would be nice to compare with some hks cams
to see what gains can be achieve through the entire power band.

 

How do you have the timing set on the Piper cams? +2/-2? What exactly?

 

The Stage 1 runs were really "stage sub 1" in Vishnu speak. My car didn't have the cam gears in at the time. The cam gears are supposed to be good for another 10+ whp.

Aonther thing worth comparing is our "stock" figures. When I first ran my baselines my G-Tech had the car weight programed at 3200 lbs. I was in a hury and didn't factor in my weight plus a tank of gas. Since then I've had to repeat that mistake every time I want to compare my mods to "stock". When I add in the extra weight the plots raise by 10 to 15 whp.

The runs were all made in 3rd gear. I have access to private road for limited testing, but it's a good hour away from where I live. That does add alot of consistancy to my runs, but also makes doing them inconvienient.

I'd really be interested in that too. One thing to keep in mind is that my numbers for the Pipers are low. The numbers from the uncorrected Mustang are probably pretty close to what the Pipers should have been on the G-Tech. Guess I should have listened to all the good advise about ARP head studs.

The cams are currently set to +1 exhaust / -3 intake. There is still a 4 degree seperation, but I have my power band shifted up slightly. Decreasing the overlap really helped idle and low speed driveability. It also increased both HP and torque on the dyno.

 

Thnx erioshi, I was waiting for this. However seeing as how your car is not quite running right with the headgasket problem I would really love to see how it comes out after you fix her. You are right about the red torque plot showing what the torque potential could be. STI like torque perhaps.

 

the higher lift in theory and most likely in practice will make more midrange torque due to quicker accleration curves......but sti like curves?.....no -_- There is no replacement for displacement.

 

Displacement comes from bore vs stroke right? Two motors with equal displacement may not have equal curves due to one being under square and one being over square. Also how boost comes on and how the engine flows will determine these curves. While, yes, there is indeed no replacement for displacement, you can replicate the power curves. Perhaps not exactly, but close

 

a bit of misunderstanding from my part, I was thinking in terms of equally modified vehicles, not to modify an evo to achieve the torque of a stock sti.

 

You are right, an STI with the same mods vs an EVO will make a very different curve, the engines aren't even layd out in the same configuration.

I'll take a 2.0 stroker inline 4 over a big bore 2.5 Boxer anyday, just my opinion

Sorry for the

 

Realistically, I'm sure the car had another 10+ whp and probably 25+ torque when it was running right.

<bench racing>
If you look at Comp Run 2 it shows 276 whp. If you add the "missing" 10 whp (sorry - bad pun, couldn't resist) to that you get the 286 that the Mustang showed when the car was running correctly. Based on that you could transpose the torque numbers and curve from the Mustang back onto the G-Tech.
</bench racing>

I know it's not "hard numbers" but I probably won't have the chance to run any more pulls with a fixed stock head. I've already talked with a couple of vendors about having mine ported.

 

I thought you had the head ported with larger valves and the whole quantum package?

 

nope - those numbers are on a stock head with stock valves. I just did the cams, valve springs, gears, and fuel pump (and tuning) as part of my cam upgrade.

 

Damn nice. Time to start playing with the Gtech. I bought it last month and it's still in the box. I wanted to do runs like you did, but AL was in town and i couldn't wait. Just threw all the parts on and got tuned right away.

 

Which Piper cams are you running? There are several choices for our Evos...the racing cams having a 12mm lift! Also, how's your idle and low end drivability?