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58mm throttle body

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Old Aug 9, 2020 | 12:26 PM
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Default 58mm throttle body
Did a 107tc build last fall with 10.25 comp.570-2 cycle rama cam run good.I used the stock throttle body,Found a screaming eagle 58mm throttle body and Arlen Ness a/c on ebay thought i would try it.Made big difference throttle is quicker and seat of the paints it seems to run a lot better.Thought from what i had read it might be to much but seems just right.
 
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Old Aug 11, 2020 | 12:37 PM
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Are your cylinder heads stock? Did you retune the bike?
 
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Old Aug 11, 2020 | 01:33 PM
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Heads are ported and polished and i haven't retuned it no issues runs good.
 
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Old Aug 11, 2020 | 02:21 PM
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Originally Posted by Steve Helton 2
Heads are ported and polished and i haven't retuned it no issues runs good.
I'm sure you'd benefit even more from a proper tune. I'm pretty sure anytime you change the airflow (in or out) you want to revisit your tuning.
 
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Old Aug 11, 2020 | 03:47 PM
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I would say so may get it retuned.Also i forgot the heads also have bigger valves and stronger valve springs.I bought my kit from Keith Dunn of Dunn performance.
 
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Old Aug 12, 2020 | 10:29 AM
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Originally Posted by Steve Helton 2
I would say so may get it retuned.Also i forgot the heads also have bigger valves and stronger valve springs.I bought my kit from Keith Dunn of Dunn performance.
I don't really know my *** from my elbow, but I am pretty sure that increasing throttle body size usually goes hand and hand with head work. I would need one of the pros to chime in on that (djl, maxheadlfow, prodrag, hillside)
 
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Old Aug 12, 2020 | 11:46 AM
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A throttle body change is reason enough for a tune. Can't tell from the OP's previous if the motor has ever been tuned.
 
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Old Aug 12, 2020 | 02:12 PM
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Originally Posted by djl
A throttle body change is reason enough for a tune. Can't tell from the OP's previous if the motor has ever been tuned.
Yes it was tuned a new tune is in the future.
 
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Old Aug 13, 2020 | 06:07 AM
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a bigger t body would warrant a tune.what size are the runners on the SE t body?
 
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Old Aug 13, 2020 | 07:11 AM
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Originally Posted by prodrag1320
a bigger t body would warrant a tune.what size are the runners on the SE t body?
I 'm not sure the size of the runners.
 
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