Raising rev limit - LotusTalk

vyuen · 02-17-2009, 06:05 PM

Does anyone have any experience with an elevated rev limit? What's the easiest way to raise the rev limit on our cars?

ZAMMY1 · 02-17-2009, 06:15 PM

yeah, the consensus is to take along a dustpan and brush when you do it.
read the technical threads, they will be of great use.
blower seems to be the way.
V-F and turbophil are most interesting.
read carefully any post by charliex. it'll be fact.
good luck, sam

turbophil · 02-17-2009, 06:18 PM

Quote:

Originally Posted by ZAMMY1

yeah, the consensus is to take along a dustpan and brush when you do it.
read the technical threads, they will be of great use.
blower seems to be the way.
V-F and turbophil are most interesting.
read carefully any post by charliex. it'll be fact.
good luck, sam

hehe, spot on with the dustpan...

OP- You should be looking to find ways to lower the rev limiter...

Cheers,

Phil

charliex · 02-17-2009, 06:26 PM

I've raised the limit a few 100 on a couple of cars, no problems so far, just don't mis-shift when you're near the limit.

cstetter · 02-17-2009, 06:36 PM

Quote:

Originally Posted by charliex

I've raised the limit a few 100 on a couple of cars, no problems so far, just don't mis-shift when you're near the limit.

Without changing any of the valvetrain components? I have heard too many stories about dropped valves with the stock rev limit as it is...

charliex · 02-17-2009, 06:41 PM

yeah i've heard them too.

jmiesse · 02-17-2009, 06:45 PM

Quote:

Originally Posted by vyuen

Does anyone have any experience with an elevated rev limit? What's the easiest way to raise the rev limit on our cars?

bro....

vyuen · 02-17-2009, 09:11 PM

I've got titanium conrods, lightweight valves and upgraded valve springs so I expect it to be able to handle the increased revs with no problem. I'm wondering if there is any advantage to adding a few 100 extra revs and whether there is power drop-off.

vyuen · 02-17-2009, 09:13 PM

Quote:

Originally Posted by charliex

I've raised the limit a few 100 on a couple of cars, no problems so far, just don't mis-shift when you're near the limit.

Charlie X, I'm interested, and my I've got upgraded valvetrain. Can you do one for me as well?

charliex · 02-17-2009, 09:31 PM

Can't see why not, so long as you're ok with the hardware standing up to it.

carlover · 02-17-2009, 10:11 PM

Quote:

Originally Posted by vyuen

I've got titanium conrods, lightweight valves and upgraded valve springs so I expect it to be able to handle the increased revs with no problem. I'm wondering if there is any advantage to adding a few 100 extra revs and whether there is power drop-off.

The only thing I would be wary of is the oil pump. Supposedly it may not maintain structural integrity above 9300 rpm.

Good luck and keep us posted on the result!

turbophil · 02-17-2009, 10:59 PM

oil pump, valves, springs, and pressure plate are all critters that break with higher revs if left in stock form. If the OP has got this stuff renewed with better bits, than have at it. CX is your guy for that...

Not that it matters a whole lot, but why are you interested in raising the revs? I've thought about doing it for a quick and dirty drag strip run. I figure 4th is only good to 112-114ish so being able to rev to 9000 or so would allow trap speeds to 120ish mph... outside of that, I can't think of anything else???

Best,

Phil

shay2nak · 02-18-2009, 09:54 AM

maybe to hit 100 in 3rd

Bavarian Motorist · 02-18-2009, 09:56 AM

Maybe for autocrossing.

kahuna001 · 02-18-2009, 10:38 AM

Put a Honda F20C and call it a day.

You can do 9k all day.

vyuen · 02-18-2009, 04:52 PM

Quote:

Originally Posted by turbophil

oil pump, valves, springs, and pressure plate are all critters that break with higher revs if left in stock form. If the OP has got this stuff renewed with better bits, than have at it. CX is your guy for that...

Not that it matters a whole lot, but why are you interested in raising the revs? I've thought about doing it for a quick and dirty drag strip run. I figure 4th is only good to 112-114ish so being able to rev to 9000 or so would allow trap speeds to 120ish mph... outside of that, I can't think of anything else???

Best,

Phil

I'm looking at various ways to increase the power. It may be easier to boost things up but there are always consequences unless there is a total engineering solution.

rocketep3 · 02-18-2009, 05:21 PM

Quote:

Originally Posted by kahuna001

Put a Honda F20C and call it a day.

You can do 9k all day.

You don't even need the f20. A k20 will do that, and is much easier to put in.

ahofste · 02-19-2009, 03:10 AM

I'm not sure why you would want to increase the rev-limiter. I'm not an expert but I thought power and torque have already peaked once you get close to the current rev-limit.

kahuna001 · 02-19-2009, 03:37 AM

Quote:

Originally Posted by rocketep3

You don't even need the f20. A k20 will do that, and is much easier to put in.

I didn't know that the K20 can do 9k rpm.
http://www.elisetalk.com/forums/imag...s/eyecrazy.gif

dstevens · 02-19-2009, 06:45 AM

A stock K20 is good for 8600 rpm for street, 8300 rpm hard use / racing. Above that the pistons come apart.

A stock F20C has forged piston and rods, and they at fine at 9000 rpm. The only weakness I know is that the stock retainers break on high mileage engines.

02-17-2009, 06:05 PM	#1 (permalink)
vyuen Registered User Join Date: Apr 2007 Posts: 187	Raising rev limit Does anyone have any experience with an elevated rev limit? What's the easiest way to raise the rev limit on our cars?

02-17-2009, 06:26 PM	#4 (permalink)
charliex OSX Black hat Join Date: Feb 2005 Location: Las Vegas , NV Posts: 9,935	I've raised the limit a few 100 on a couple of cars, no problems so far, just don't mis-shift when you're near the limit. __________________ Black Exige S - http://goth.am 265 Mule / Elan M100.ECU Tuning, http://www.elisetalk.com/forums/showthread.php?t=39660 West Coast Lotus Meet - Las Vegas - November 6-9 2009 http://www.westcoastlotus.com/

02-17-2009, 06:41 PM	#6 (permalink)
charliex OSX Black hat Join Date: Feb 2005 Location: Las Vegas , NV Posts: 9,935	yeah i've heard them too. __________________ Black Exige S - http://goth.am 265 Mule / Elan M100.ECU Tuning, http://www.elisetalk.com/forums/showthread.php?t=39660 West Coast Lotus Meet - Las Vegas - November 6-9 2009 http://www.westcoastlotus.com/

02-17-2009, 09:31 PM	#10 (permalink)
charliex OSX Black hat Join Date: Feb 2005 Location: Las Vegas , NV Posts: 9,935	Can't see why not, so long as you're ok with the hardware standing up to it. __________________ Black Exige S - http://goth.am 265 Mule / Elan M100.ECU Tuning, http://www.elisetalk.com/forums/showthread.php?t=39660 West Coast Lotus Meet - Las Vegas - November 6-9 2009 http://www.westcoastlotus.com/

02-17-2009, 10:59 PM	#12 (permalink)
turbophil Plug Whisperer Join Date: Dec 2005 Location: Kansas City/ Overland Park Posts: 2,544 Images: 6	oil pump, valves, springs, and pressure plate are all critters that break with higher revs if left in stock form. If the OP has got this stuff renewed with better bits, than have at it. CX is your guy for that... Not that it matters a whole lot, but why are you interested in raising the revs? I've thought about doing it for a quick and dirty drag strip run. I figure 4th is only good to 112-114ish so being able to rev to 9000 or so would allow trap speeds to 120ish mph... outside of that, I can't think of anything else??? Best, Phil __________________ \| '05 GG LSS Elise \| A Track Chariot \| BOE ClamHinge \| BOE TVS SuperCharger 280whp/180wtq \| EFI Standalone Engine Management \| BOE Fuel Surge System \| BOE Lotus Tow Package See my car at BOE Fabrication: www.boefabrication.com *----->Last Updated: 9/25/2009* If something ain't worth doing right, it ain't worth doing... *Whoever thought working on a Lotus is hard, clearly hasn't tried it. Pick up a wrench and get some grease under your nails*

02-17-2009, 06:15 PM	#2 (permalink)
ZAMMY1 ZAMMY Join Date: Jan 2007 Location: washington, pa, (near PGH.) Posts: 1,557	yeah, the consensus is to take along a dustpan and brush when you do it. read the technical threads, they will be of great use. blower seems to be the way. V-F and turbophil are most interesting. read carefully any post by charliex. it'll be fact. good luck, sam

02-17-2009, 09:11 PM	#8 (permalink)
vyuen Registered User Join Date: Apr 2007 Posts: 187	I've got titanium conrods, lightweight valves and upgraded valve springs so I expect it to be able to handle the increased revs with no problem. I'm wondering if there is any advantage to adding a few 100 extra revs and whether there is power drop-off.

02-18-2009, 09:54 AM	#13 (permalink)
shay2nak I <3 chicken, I <3 liver Join Date: Dec 2003 Location: Land of da 1000 Oaks, CA Posts: 15,006	maybe to hit 100 in 3rd __________________ save ~10 lbs gain 1 hp EQ: Y=(190X) / (1984-X) where Y is (HP) and X is (lbs) '07 EXIGE S * MY CAR ** VIDEOS! '08 ACURA TSX 6-speed http://www.makeNYNYagain.com

02-18-2009, 09:56 AM	#14 (permalink)
Bavarian Motorist Live to Drive Join Date: Nov 2006 Location: NYC/Westchester, NY Posts: 10,850	Maybe for autocrossing. __________________ Be an alpha male. Drive a Lotus.

02-18-2009, 10:38 AM	#15 (permalink)
kahuna001 Registered User Join Date: Mar 2008 Location: Union Posts: 52 Images: 2	Put a Honda F20C and call it a day. You can do 9k all day. __________________ 1978 Honda CX500 2003 Honda S2000 with Greddy Turbo. 2005 Lotus Elise # 39 + LETSLA V2 2007 Honda Pilot

02-19-2009, 03:10 AM	#18 (permalink)
ahofste A cloggy in the desert Join Date: Nov 2004 Location: Dubai Posts: 90	I'm not sure why you would want to increase the rev-limiter. I'm not an expert but I thought power and torque have already peaked once you get close to the current rev-limit. __________________ 2007 Chrome Orange Lotus Elise 2003 Starlight Black Lotus Elise 111S (sold)

02-19-2009, 06:45 AM	#20 (permalink)
dstevens 2zz exorcism complete Join Date: Mar 2007 Location: California Posts: 393 Images: 4	A stock K20 is good for 8600 rpm for street, 8300 rpm hard use / racing. Above that the pistons come apart. A stock F20C has forged piston and rods, and they at fine at 9000 rpm. The only weakness I know is that the stock retainers break on high mileage engines. __________________ -2ZZ +K24 +150hp +118tq +7mpg +LSD -30lbs -CoG +F.bias

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