Went to the dyno today.
06-06-2008, 11:03 AM
#1
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Went to the dyno today.
So, i went to the dyno today. A little less power than i expected but that just means that there is power left on the table.
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Discuss.
\Discuss.
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2.25" exhaust!
06-06-2008, 11:20 AM
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you let off wayyyy too early. the turbo is spooling slow for a 1.8 and losing torque fast. needs more exhaust.
even if we guess that you lost torque in a linear fashion to redline, you would of had a peak HP of 226. you lost 15 tq from 4700 to 5700. lets say you drop 25 more from 5700 to 7000. thats a total of 170 rwtq at 7000rpm....giving you 226rwhp.
we dont drive mustangs...we drive high reving miatas.
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06-06-2008, 11:28 AM
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yes, dumping fueling and retarding timing as the turbo spools will help...let me look at your timing map. also remember, mustang dynos read fairly low compared to the SAE standard dynojet dyno, unless they corrected for it.
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06-06-2008, 12:16 PM
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ok, that's very odd for a your turbo to run out of efficiency like that. you are running plenty of spark in boost. i gotta blame the exhaust.
but logging at the logs, you can see where the boost starts to rise slowly, then starts making it fast. it's also at the same time you finally retard a lot of spark. dropping from 27° to 20°
I personally start at 10-12° at low boost/rpms and build to 17° at redline. it's safe to add timing as rpms increase.
now take a look at how my turbo spools compared to your.....i have a t3 super 60. so we actually have the same exact compressor wheel, and we have the same exact manifold. now my turbine is actually larger than yours, and if you have a .63 a/r then we have equal a/r. so with your 1.8L you should spool faster than me, but that's not the case.....notice my spark angle....
but logging at the logs, you can see where the boost starts to rise slowly, then starts making it fast. it's also at the same time you finally retard a lot of spark. dropping from 27° to 20°
I personally start at 10-12° at low boost/rpms and build to 17° at redline. it's safe to add timing as rpms increase.
now take a look at how my turbo spools compared to your.....i have a t3 super 60. so we actually have the same exact compressor wheel, and we have the same exact manifold. now my turbine is actually larger than yours, and if you have a .63 a/r then we have equal a/r. so with your 1.8L you should spool faster than me, but that's not the case.....notice my spark angle....
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06-06-2008, 12:41 PM
#20
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not really no. you're holding boost to redline. to me it seems the turbine is choking. since we know that turbo should be good for torque to redline a case of excessive back pressure would be wasting energy pushing exhaust out of the head instead of pushing the pistons down.
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