Raising The Redline On The Z

THE BULL · 06-17-2021, 01:37 PM

It's a hit or miss and this is a topic you don't want any misses.
Raising a the redline and tuning for it will move your power band and leave your low/mid range a bit bland.

Then ask yourself where in that rev-range will you see yourself and you can come up with a better answer. Tons of things at play here.

A balanced crank/rods with an ATI and great oil pump clearances should last quite a bit but it's all determined on driver/abuse/tune.

Whoever plans on this should have coolers, damper, tune and should open their filters.

Rev should be determined on Rod/stroke ratio + mods + tune. Even then it's not a guarantee.

It appears the VHR has a 1.72 ratio (if math is right)
For better comparision:
Honda K24s have a 1.54 ratio and with a type S pump they are usually revved to 8k
While it's younger brother the K20 has a 1.62 ratio and these are take to 9k every day.
The odd child would be the F20c with a ratio of 1.81 and these are production engines with a standard 9k rev limit.

I understand that how some may feel about Hondas however these high revvers can provide great info at that ratio as long as everything else holds 8k should be feasible.

Hotrodz · 06-17-2021, 04:07 PM

Quote:

Originally Posted by THE BULL

It's a hit or miss and this is a topic you don't want any misses.

Raising a the redline and tuning for it will move your power band and leave your low/mid range a bit bland.

Then ask yourself where in that rev-range will you see yourself and you can come up with a better answer. Tons of things at play here.

A balanced crank/rods with an ATI and great oil pump clearances should last quite a bit but it's all determined on driver/abuse/tune.

Whoever plans on this should have coolers, damper, tune and should open their filters.

Rev should be determined on Rod/stroke ratio + mods + tune. Even then it's not a guarantee.

It appears the VHR has a 1.72 ratio (if math is right)

For better comparision:

Honda K24s have a 1.54 ratio and with a type S pump they are usually revved to 8k

While it's younger brother the K20 has a 1.62 ratio and these are take to 9k every day.

The odd child would be the F20c with a ratio of 1.81 and these are production engines with a standard 9k rev limit.

I understand that how some may feel about Hondas however these high revvers can provide great info at that ratio as long as everything else holds 8k should be feasible.

If you want a rev high vq engine talk Jim Wolf. Valkyrie Autosport runs one that is stroked with a HR head and rev to 9k. Sasha runs one in his hybrid 350. They are bada$$ motors. Valkyrie got five year of race use and they pretty much only do endurance racing.

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06-17-2021, 01:37 PM	#1 (permalink)
THE BULL Base Member Join Date: Apr 2021 Location: Florida Posts: 216 Drives: G37S Rep Power: 26850	It's a hit or miss and this is a topic you don't want any misses. Raising a the redline and tuning for it will move your power band and leave your low/mid range a bit bland. Then ask yourself where in that rev-range will you see yourself and you can come up with a better answer. Tons of things at play here. A balanced crank/rods with an ATI and great oil pump clearances should last quite a bit but it's all determined on driver/abuse/tune. Whoever plans on this should have coolers, damper, tune and should open their filters. Rev should be determined on Rod/stroke ratio + mods + tune. Even then it's not a guarantee. It appears the VHR has a 1.72 ratio (if math is right) For better comparision: Honda K24s have a 1.54 ratio and with a type S pump they are usually revved to 8k While it's younger brother the K20 has a 1.62 ratio and these are take to 9k every day. The odd child would be the F20c with a ratio of 1.81 and these are production engines with a standard 9k rev limit. I understand that how some may feel about Hondas however these high revvers can provide great info at that ratio as long as everything else holds 8k should be feasible.