400 HP Engine Build - Input Needed
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Laughing Gas
Joined: Mar 2021
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I've got 180/30s. I'm sure once I have some parts in front of me to start fitting together my mind will wander less.
CNCFAB
Joined: Apr 2020
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I have run the 180/30 and the 363/68 .91 on both an auto and a zf6, they pair very well together. I would see zero reason to change the housing size
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Laughing Gas
Joined: Mar 2021
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*HEUI seems kind of wasted above 2800 RPM what with shrinking injection window and comparatively slow injection. Lot of people use hybrids to deal with this and focus on big power between 2000-3000... not sure why there's fewer looking for a wider power-band with more torque below 2k?
Cargo Master
Joined: May 2018
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You're probably right. I guess I figured the smaller housing would increase the power-band by lowing peak torque RPM. That's my big goal with this build*. That being said, I have no idea if a gated S300 housing would even clear the RR plenums.
*HEUI seems kind of wasted above 2800 RPM what with shrinking injection window and comparatively slow injection. Lot of people use hybrids to deal with this and focus on big power between 2000-3000... not sure why there's fewer looking for a wider power-band with more torque below 2k?
*HEUI seems kind of wasted above 2800 RPM what with shrinking injection window and comparatively slow injection. Lot of people use hybrids to deal with this and focus on big power between 2000-3000... not sure why there's fewer looking for a wider power-band with more torque below 2k?
Lead Driver
Joined: Jul 2017
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From: WV
Originally Posted by PriusLover
not sure why there's fewer looking for a wider power-band with more torque below 2k?
I agree, especially with the 4R100. Loads of torque between 1500-2500 would be great as it seems mine is always floating in there somewhere. The PMRs are currently one thing keeping me from trying the .83 housing.
FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
Lots of people fear getting a windowed block when adding power at lower RPM. DP Tuner was apparently famous for that which is why they have fallen out of favor. I may be jinxing myself but I have been running a DP Tuner with a somewhat built bottom end (that’s what she said) and I like it a lot.
Edit: @RacinJasonWV beat me to it.
Edit: @RacinJasonWV beat me to it.
Cargo Master
Joined: May 2018
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Forget to reply to your earlier post in this thread, my truck has PMRs with the .83 housing.
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Laughing Gas
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Lead Driver
Joined: Jun 2013
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From: north of Minneapolis, MN
Lots of people fear getting a windowed block when adding power at lower RPM. DP Tuner was apparently famous for that which is why they have fallen out of favor. I may be jinxing myself but I have been running a DP Tuner with a somewhat built bottom end (that’s what she said) and I like it a lot.
Edit: @RacinJasonWV beat me to it.
Edit: @RacinJasonWV beat me to it.
Cargo Master
Joined: May 2018
Posts: 2,442
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IMO as long as boost stays below 30psi @ 2000rpm or 20psi @ 1800rpm you should have nothing to worry about if you have good tuning. Have been running like this for a few years now on a stock bottom end with no concerns. Hitting 30psi between 2000-2100rpm makes for a fantastic towing experience and great powerband. That is A LOT of air getting crammed into the engine.
FTE Chapter Leader
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From: Henderson, NV
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Laughing Gas
Joined: Mar 2021
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The stems all read 0.0001 to 0.0002 over the minimum size clearance, with a tighter distribution than the new melling valves. I was considering bronze valve guides but this tells me that iron guides are the way to go.
Lead Driver
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From: WV
Originally Posted by FordTruckNoob
Edit: @RacinJasonWV beat me to it.
Originally Posted by PriusLover
This is a valid concern. I also get the impression that, for a variety of cultural and historical reasons, the enthusiasts and the market targeting them have other priorities (mostly if you're spending lots of money you're after big peak power).
Yeah I feel like the 4R100 makes the narrow power-band more apparent. Maybe less of an issue with the 6-speed?
Yeah I feel like the 4R100 makes the narrow power-band more apparent. Maybe less of an issue with the 6-speed?
I agree, lots of people just want big HP numbers no matter what. Many others just don’t understand what those bigger parts do to their powerband, or that there’s even such a thing.
Drive-ability will always be more pleasant with a broad torque curve. And in the case of the 7.3, the typical cruising rpm is fairly low with the 4R100. It’s easy to get under the curve unless running the ZF6 or adjusting shift points.
There’s just not enough gears in our trucks. The band between gears tends to stretch beyond the range of good power. Shift up, rpm too low. Shift down, rpm is screaming at you. Stock-ish powerband seems to help this… go figure.
