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XT6 Dyno Runs


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5 replies to this topic

#1 Myxalplyx

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Posted 07 February 2004 - 06:53 PM

I did a few dyno runs earlier today on a DynoJet dynanometer. The name of the shop is called Xotic Motorsports in Cochranville, PA. Car dyno'd was a 1989 2.7ltr XT6 FWD. The graphs are in pdf format so you'll need Adobe Acrobat to view it. Haven't had a chance to convert them over to jpeg.

Mods done to car are:
JC Sports intake
2.5" exhaust and 2.5" Cat Converter
Dynomax Ultra Flow SS muffler 2.5"
Unorthodox Racing Pulley *custom*
ProECM PowerChip
4 (8 gauge) ground wires
MSD inline fuel pump
AEM fuel pressure regulator (raised to richen air/fuel ratios during runs)

This is by no means a 'bragging rights' dyno run(s). It's just a point of reference. Runs are SAE corrected.

http://mywebpages.co...ck/XT6Dyno4.pdf
http://mywebpages.co...ck/XT6Dyno5.pdf
http://mywebpages.co...ck/XT6Dyno6.pdf
http://mywebpages.co...ck/XT6Dyno8.pdf

BTW: Here are some older runs I did on a mobile Dynojet at Cecil County Dragway. Differences with these runs are:
1: No aftermarket fuel pressure regulator,
2: Apexi SAFC which ran car lean, improper setup,
3: Still had one of the 2 stock cat converters

http://mywebpages.co...masck/Dyno1.JPG
http://mywebpages.co...masck/Dyno2.JPG
http://mywebpages.co...masck/Dyno3.JPG
http://mywebpages.co...masck/Dyno4.JPG
http://mywebpages.co...masck/Dyno5.JPG

Just some points of reference. Slam away!

#2 JonOfScio

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Posted 07 February 2004 - 07:14 PM

is that at the wheels right?

#3 Myxalplyx

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Posted 07 February 2004 - 07:24 PM

Originally posted by JonOfScio
is that at the wheels right?



Yes!

BTW: All my dyno runs got choppy above 5300rpm despite me adding fuel (My EGT gauges thermocouple is O/S so I couldn't use that as a gauge for anything). Besides a lean condition, what else would cause choppiness in power delivery?

On a side note, after every run, my oil dipstick looked like it wanted to escape out the engine bay (partually out). The PCV valve was changed earlier THIS week with an OEM unit (thanks to u guys) and all of my vacuum hoses (2 crankcase hoses that connect to intake and the xmas tree thingy) was cleaned out at the same time. Maybe my valves or piston rings are worn. I dunno...u are the gurus. :(

#4 subarubrat

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Posted 07 February 2004 - 07:34 PM

I am interested in how your proECM cip is working out. I had allot of problems with the stock ECU in general. It would flake out and give me problems as I reached higher injector duty cycles, so much that I did away with it all together and went with the LINK ECU. The Impreza ECU on the other hand (as you well know) is VERY piggyback friendly, I sure wish the ER27 ECU was. Of course with the LINK any injector that will fit the rail can be used and there are a ton of low impedence ones that fit.

Your fuel dip at 6ish looks mighty familiar. I had that same problem when I was trying to run RRFPR and a AFC to get closer to the 250 cc I figured I needed. I never could get a satisfactory solution that way. The pump was part of the problem to. My current solution is a 255Lph pump and the fuel curve dissapeared.

#5 Subarutex

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Posted 07 February 2004 - 09:38 PM

Looks good.

Numbers are numbers. You can't deny facts. I have a couple of questions.

I've tried to contact proECM to get pricing on an ecu for my RX. They haven't gotten back to me. How much did you pay for the power chip? Is it programmable at all? OH... and how do you get ahold of those guys!

Good job. By anychance did you dyno your wagon then too? Interested to see what the turbo/nitrous would put down in that.

#6 Myxalplyx

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Posted 07 February 2004 - 10:02 PM

Originally posted by Subarutex
Looks good.

Numbers are numbers. You can't deny facts. I have a couple of questions.

I've tried to contact proECM to get pricing on an ecu for my RX. They haven't gotten back to me. How much did you pay for the power chip? Is it programmable at all? OH... and how do you get ahold of those guys!

Good job. By anychance did you dyno your wagon then too? Interested to see what the turbo/nitrous would put down in that.



I contacted Dave at ProECM a while back through the XT6 board. He was selling lightweight pulleys and the chip to the XT6 peeps but no-one was biting. So I went for it. No check engine lights, but I haven't noticed any 1/4 mile gains nor loses in speed or E.T. Everything just stayed the same. ??? I am using 93 octane though. You are supposed to use this so the chip can 'take advantage' of the higher octane. U can run lower octane if you choose however. Still, I haven't noticed or seen any difference in performance or drivabililty.

The wagon is back stock except for an underdrive pulley and a cat back exhaust. Which is good actually since I can dyno it now and compare the difference. The shop has an AWD dyno and with the wideband O2, it only costs $50.00 :eek: I'll be spending a LOT of time at this shop before they catch on and up their prices. I may take the wagon up next week probably Tuesday or Wednesday. I'm expecting (hoping) for hp in the low 90's. :cool:

I noticed that the infamous 'Subaru Dyno Dip' is gone in my new dyno runs vs my old ones between 4000 and 5100rpm. Wonder how the intake affected this. I though it was just by design of the subaru motor since most subarus I've seen has this 'dip' in the powerband at about those points.




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