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I wonder if the HR being overall wider added the additional volume.
Could the additional volume also from the runner lengths vs the chamber?
Thanks for adding more information. Wish I had this to add to my video when I was making it.
Yea that could be, I haven't really looked into all the differences when I did the comparison. But HR is slightly larger (vol wise) and yes smaller runners in the same package will allow for more water vol. Since those runners are taking up less physical space vs VHR though it wouldn't be a whole lot.
YouTube video? You can always pin a comment with this info
I'm sure someone can do the math (not I) to figure out max resonant frequency given runner and plenum sizes.
From what I saw on my dyno tuning session, there's less of a spike/peak in torque in the midrange than what I've seen for stock VHR37 engines. I'm sure I lost a little top end with the VR35 manifold, but the middle looks smoother. Unfortunately unless you own a tuning shop it is difficult to do before/after mod runs (especially when like me you're 6 hours away from the dyno).
What, 3 years in? Maybe 4 now? No complaints. Car still pulls very strong to redline in any gear I can safely do so.
Edited to add: I've been considering adding a Z1 ported upper VR35 mani (I think I've got a clean spare) and Z1 ported VHR37 lower... not sure if that would cancel out the midrange gains or what. No free lunch with thermodynamics.
I'm sure someone can do the math (not I) to figure out max resonant frequency given runner and plenum sizes.
From what I saw on my dyno tuning session, there's less of a spike/peak in torque in the midrange than what I've seen for stock VHR37 engines. I'm sure I lost a little top end with the VR35 manifold, but the middle looks smoother. Unfortunately unless you own a tuning shop it is difficult to do before/after mod runs (especially when like me you're 6 hours away from the dyno).
What, 3 years in? Maybe 4 now? No complaints. Car still pulls very strong to redline in any gear I can safely do so.
Edited to add: I've been considering adding a Z1 ported upper VR35 mani (I think I've got a clean spare) and Z1 ported VHR37 lower... not sure if that would cancel out the midrange gains or what. No free lunch with thermodynamics.
Do you have any1/4 mile times to show what a difference the intake swap made?
Do you have any1/4 mile times to show what a difference the intake swap made?
Well, no, for the reasons stated above. I have the dyno runs with it already installed (untuned to tuned) and they're on my build thread. Tuning gained about 15HP over the manifold on just the stock tune.
I do not drag race and haven't in 30 years so that information isn't really relevant to what I wanted from the car. I didn't want performance off the line - there's only so much of that you can use before you out-traction your tires, even with a totally stock car. I wanted midrange, so think 30-70 runs which are more typical of spirited surface road driving (and track to be honest).
What I *would* like to see done is a dyno run with and then without traction control - how much HP is it sapping in the name of 'safety'.
Well, no, for the reasons stated above. I have the dyno runs with it already installed (untuned to tuned) and they're on my build thread. Tuning gained about 15HP over the manifold on just the stock tune.
I do not drag race and haven't in 30 years so that information isn't really relevant to what I wanted from the car. I didn't want performance off the line - there's only so much of that you can use before you out-traction your tires, even with a totally stock car. I wanted midrange, so think 30-70 runs which are more typical of spirited surface road driving (and track to be honest).
What I *would* like to see done is a dyno run with and then without traction control - how much HP is it sapping in the name of 'safety'.
Cool I made the swap and noticed the low & midrange difference. I am Untuned. I have exhaust but not installed yet. Will get to that sometime. Would like to see the other mods you have.
Engine mods - home-made 2.75" cold air intake with flow-straighteners in the MAF tubes, VH35 upper manifold, ZSpeed lightweight steel flywheel, FI resonated cats and catback; that's it. Tuned on ECUTek by Z1 at their shop a few years ago with a 93 octane and 87 octane tune (in case I'm in the sticks and can only get crap gas).
When I had the tuning done, I researched bone-stock dyno numbers to figure out drivetrain losses and came up with something like 314 wheel HP = 350ish flywheel HP. There are faster cars on the road but with TC turned off this is as much power as I'd want in a daily.
(mostly said to assuage the fact I can't afford substantially faster LOL)
Engine mods - home-made 2.75" cold air intake with flow-straighteners in the MAF tubes, VH35 upper manifold, ZSpeed lightweight steel flywheel, FI resonated cats and catback; that's it. Tuned on ECUTek by Z1 at their shop a few years ago with a 93 octane and 87 octane tune (in case I'm in the sticks and can only get crap gas).
When I had the tuning done, I researched bone-stock dyno numbers to figure out drivetrain losses and came up with something like 314 wheel HP = 350ish flywheel HP. There are faster cars on the road but with TC turned off this is as much power as I'd want in a daily.
(mostly said to assuage the fact I can't afford substantially faster LOL)
I'm intrigued by the flow straighteners. Going to see if I can find some 3" I can adapt into my setup and use it as part of my intake comparison
