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The Terminator
Engine/Tuning
Belt slip and/or something else? Help!
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<blockquote data-quote="sushistrip" data-source="post: 12355623" data-attributes="member: 140961"><p>2003 cobra, 23k miles, </p><p>jlt cai, magnaflow catback, upr o/r x pipe, sctba2600 maf sensor, 2.81 s/c pulley, 2 aftermarket idlers stock size, bigger belt. </p><p></p><p>Before the xpipe and before I installed a spec stage 2+ clutch and steel flywheel (never. again. shop recommend steel for whatever reason, should of done more research) she dynoed at 438whp/478whtq at 14 psi. </p><p></p><p>Just took it back for a retune and she layed down a whopping 414/451....wait, WHAT?!</p><p></p><p>Rather than write a book about the numbers, here are some pics:</p><p></p><p>[ATTACH=full]386870[/ATTACH]</p><p>[ATTACH=full]386871[/ATTACH]</p><p>[ATTACH=full]386872[/ATTACH]</p><p></p><p>Shop said they were having trouble with belt slip and tire spinning so they had to tie it down quite a bit, which is understandable since it was fairly cold out. This run is making more boost than when I had it first tuned, yet less power? And looking at the psi it's clear that the belt slip was fixed that run. So why am I making such low numbers?!</p><p></p><p>I also need to note that the car does feel STRONGER than before, which is odd considering the numbers it made. It feels even more torqy and faster at certain speeds. I did notice some belt slip while going up a slight hill in third gear on the highway, I'm thinking this is because of the extra load from going up a hill because I did a few more runs on level ground and no slip. The shop also mentioned something about there was no air correction since the temperature outside was perfect. Also it has a steel flywheel, not aluminum. And it has the boost bypass mod, which the shop checked to make sure the actuator was working and its working perfectly. I honestly think the numbers are because of wheel spin but how then how the hell do these 700 and 800 whp cars throw down the numbers they do?!</p></blockquote><p></p>
[QUOTE="sushistrip, post: 12355623, member: 140961"] 2003 cobra, 23k miles, jlt cai, magnaflow catback, upr o/r x pipe, sctba2600 maf sensor, 2.81 s/c pulley, 2 aftermarket idlers stock size, bigger belt. Before the xpipe and before I installed a spec stage 2+ clutch and steel flywheel (never. again. shop recommend steel for whatever reason, should of done more research) she dynoed at 438whp/478whtq at 14 psi. Just took it back for a retune and she layed down a whopping 414/451....wait, WHAT?! Rather than write a book about the numbers, here are some pics: [ATTACH=full]386870[/ATTACH] [ATTACH=full]386871[/ATTACH] [ATTACH=full]386872[/ATTACH] Shop said they were having trouble with belt slip and tire spinning so they had to tie it down quite a bit, which is understandable since it was fairly cold out. This run is making more boost than when I had it first tuned, yet less power? And looking at the psi it's clear that the belt slip was fixed that run. So why am I making such low numbers?! I also need to note that the car does feel STRONGER than before, which is odd considering the numbers it made. It feels even more torqy and faster at certain speeds. I did notice some belt slip while going up a slight hill in third gear on the highway, I'm thinking this is because of the extra load from going up a hill because I did a few more runs on level ground and no slip. The shop also mentioned something about there was no air correction since the temperature outside was perfect. Also it has a steel flywheel, not aluminum. And it has the boost bypass mod, which the shop checked to make sure the actuator was working and its working perfectly. I honestly think the numbers are because of wheel spin but how then how the hell do these 700 and 800 whp cars throw down the numbers they do?! [/QUOTE]
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Belt slip and/or something else? Help!
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