Low 408 stroker numbers on the dyno...ideas?
05-25-2018, 12:08 PM
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Low 408 stroker numbers on the dyno...ideas? Ran my new motor last night on the dyno, numbers seemed way low...but maybe we were expecting to much? 6.0 iron block, 4" stroker crank and rods, weisco pistons (10.5:1 compression) , trick flow 225 heads, 236/244 .610 lift on 112 lobe, 102 fast and NW 102 thottle body, 1 3/4 headers in a 98 A4 vette, built 4l65e w/yank 3600, thru 3:73's. Any ideas ? Thanks in advance!
05-25-2018, 12:55 PM
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Ran my new motor last night on the dyno, numbers seemed way low...but maybe we were expecting to much? 6.0 iron block, 4" stroker crank and rods, weisco pistons (10.5:1 compression) , trick flow 225 heads, 236/244 .610 lift on 112 lobe, 102 fast and NW 102 thottle body, 1 3/4 headers in a 98 A4 vette, built 4l65e w/yank 3600, thru 3:73's. Any ideas ? Thanks in advance!
My .02
1. Heads are small, 235s at a minimum for cathedrals on a 408" (kinda like FAST 92 VS 102)
2. Headers are definitely small, should have 1 7/8"
3. Cam could be a little bigger with small heads (ideal for larger cat heads), a little more lift ~.630" ish depending on
rockers & springs.
4. Compression depending on fuel 93 VS 91, could be a tad higher 11.0-11.2:1
All that said the A4 & stall probably at least 20-30 less VS T56 , There is also a +- 10%
Variances between different Types of Dynos, let alone operators & tooners, LOL
AS others will say Dynos are only tools to measure changes, it most likely runs & drives real
well on the street, and should be a lot of fun. Just depends on application,goals & money.
05-25-2018, 12:57 PM
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Unlocked...peaked at 6150...rev was set at 6500. When we started, it would only pull to 6200...mass air ran out. I pulled a thread off here and showed the tuner, he used the info and was able to pull to 6500. 6490 to be exact
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05-25-2018, 01:07 PM
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My .02
1. Heads are small, 235s at a minimum for cathedrals on a 408" (kinda like FAST 92 VS 102)
2. Headers are definitely small, should have 1 7/8"
3. Cam could be a little bigger with small heads (ideal for larger cat heads), a little more lift ~.630" ish depending on
rockers & springs.
4. Compression depending on fuel 93 VS 91, could be a tad higher 11.0-11.2:1
All that said the A4 & stall probably at least 20-30 less VS T56 , There is also a +- 10%
Variances between different Types of Dynos, let alone operators & tooners, LOL
AS others will say Dynos are only tools to measure changes, it most likely runs & drives real
well on the street, and should be a lot of fun. Just depends on application,goals & money.
1. Heads are small, 235s at a minimum for cathedrals on a 408" (kinda like FAST 92 VS 102)
2. Headers are definitely small, should have 1 7/8"
3. Cam could be a little bigger with small heads (ideal for larger cat heads), a little more lift ~.630" ish depending on
rockers & springs.
4. Compression depending on fuel 93 VS 91, could be a tad higher 11.0-11.2:1
All that said the A4 & stall probably at least 20-30 less VS T56 , There is also a +- 10%
Variances between different Types of Dynos, let alone operators & tooners, LOL
AS others will say Dynos are only tools to measure changes, it most likely runs & drives real
well on the street, and should be a lot of fun. Just depends on application,goals & money.
05-25-2018, 02:11 PM
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What type of dyno ?
05-25-2018, 03:00 PM
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Car is ok, it runs good but no 500 hp good. Doesn't push you back or anything. No big stomp power.
05-25-2018, 03:39 PM
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05-25-2018, 03:56 PM
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I do remember the builder used my short travel lifters, didn't seem to concerned. Said he thought they were comps. May not mean anything thou...i m just looking for answers
05-25-2018, 04:24 PM
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05-25-2018, 04:24 PM
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What's your cats, X or Y pipe, etc look like?