Low 408 stroker numbers on the dyno...ideas?
05-25-2018, 04:40 PM
#22
Something is off, does it feel lazy? If so it may need more timing.
I put together a 406 stroker for a buddy a few years back. It had similar heads and cam to you, but your heads and exhaust are a little better. Through a 4L60 and a 12 bolt it did 497 to the tires. It had a 102 on it as well. Trying to remember but I think that was also a SS3600 car.
I put together a 406 stroker for a buddy a few years back. It had similar heads and cam to you, but your heads and exhaust are a little better. Through a 4L60 and a 12 bolt it did 497 to the tires. It had a 102 on it as well. Trying to remember but I think that was also a SS3600 car.
Last edited by 00pooterSS; 05-25-2018 at 04:46 PM.
05-25-2018, 04:51 PM
#24
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Hp is definitely low but the TQ is way down. That’s 5.7 TQ
yes the heads are small but TQ shouldn’t be down like that
AFR is lean. Do you know what the max timing is? What fuel are you running?
yes the heads are small but TQ shouldn’t be down like that
AFR is lean. Do you know what the max timing is? What fuel are you running?
05-25-2018, 04:53 PM
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Something is off, does it feel lazy? If so it may need more timing.
I put together a 406 stroker for a buddy a few years back. It had similar heads and cam to you, but your heads and exhaust are a little better. Through a 4L60 and a 12 bolt it did 497 to the tires. It had a 102 on it as well. Trying to remember but I think that was also a SS3600 car.
I put together a 406 stroker for a buddy a few years back. It had similar heads and cam to you, but your heads and exhaust are a little better. Through a 4L60 and a 12 bolt it did 497 to the tires. It had a 102 on it as well. Trying to remember but I think that was also a SS3600 car.
05-25-2018, 05:03 PM
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05-25-2018, 05:24 PM
#28
Compression is too low for that size camshaft, your dynamic compression is probably too low. Stroker motors are designed to make fat torque, not high rpm HP. Headers are too small.. Run 1 7/8 headers, get another 1 - 1.5 points in compression and youll be better off. I personally think that cam is too big period, you dont need a monster cam with good high flow / high velocity heads to make power. I would change the camshaft with less duration and keep the lift at whatever the heads peak flow is at. Just my two cents..
05-25-2018, 08:16 PM
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05-30-2018, 04:26 PM
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no reason for it not to make 475+ like it sets on a dynojet with it not having any issues. with 27* in it and peaking @ 6150 neither of those 2 is the issue,unless it's got false knock and killing timing. i made almost 540 rw in a 408 with 1 3/4 headers so headers not the problem.hopefully you can get it figured out.
05-30-2018, 08:03 PM
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Originally Posted by big hammer
Hp is definitely low but the TQ is way down. That’s 5.7 TQ
yes the heads are small but TQ shouldn’t be down like that
AFR is lean. Do you know what the max timing is? What fuel are you running?
yes the heads are small but TQ shouldn’t be down like that
AFR is lean. Do you know what the max timing is? What fuel are you running?
Def look at that AFR. If its properly tuned it could be indicating the fuel pump is failing.
Also, maybe just start the car from cold and check the headers for a cold primary - ie dead cylinder.
05-31-2018, 09:46 PM
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running on 7?
05-31-2018, 10:27 PM
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Just for the record guys...my tuner and builder both say the issue is torque converter. Want me to swap to a circle d, triple disc. I don't know... I do know the car only makes good power when you get in it hard ,still isn't impressive.
06-01-2018, 12:12 AM
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Originally Posted by Keith Wade
running on 7?
Torque converter is a possibility as well, but I deal so little with autos I can not give good advice on that point.
06-01-2018, 06:38 AM
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I think it is possible. Where your torque is x 8 / 7 puts you around 480 ft lbs which would be about right. Likely all your misfire stuff is turned off as per typical cam tuning.
Torque converter is a possibility as well, but I deal so little with autos I can not give good advice on that point.
Torque converter is a possibility as well, but I deal so little with autos I can not give good advice on that point.
06-01-2018, 09:03 AM
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[QUOTE=Darth_V8r;19906543]I think it is possible. Where your torque is x 8 / 7 puts you around 480 ft lbs which would be about right. Likely all your misfire stuff is turned off as per typical cam tuning.
Torque converter is a possibility as well, but I deal so little with autos I can not give good advice on that point.[/QUOTE
Found one plug wire with nice hole burned in it, one with a big crack in it and another with top of boot melted. It's running on all 8, I 'll drive it as soon as pavement dries up.
Torque converter is a possibility as well, but I deal so little with autos I can not give good advice on that point.[/QUOTE
Found one plug wire with nice hole burned in it, one with a big crack in it and another with top of boot melted. It's running on all 8, I 'll drive it as soon as pavement dries up.