Going beyond 7k RPM: A Thread

[Porter]

Like many of you, I'm interested in exploring what options exist for raising the rev limit (safely) once my warranty is done.

At minimum, this involves a reflash of the factory engine management or a replacement of the ECM. Both are available, with replacement ECMs from JUBU Performance (Syvecs) on sale now, and MWR (ECUmaster) coming later this year, among others. Reflashes are currently in development from BOE Fabrications as well as a range of other tuning shops. So there will be technical methods to achieve remapping appropriate to this objective.


From what I've read, the limiting physical factor in increasing engine RPM significantly on the 2GR-FE (as supplied by Lotus) is apparently the valvetrain, specifically the valve springs. There are several options on the market to replace these, in varying degrees of increased performance over the stock valvetrain.

Mild: Jubu Performance valve springs for 2GR-FE - 30% harder, good to 7700rpm on otherwise stock valvetrain.​

​

Moderate: MWR valve springs for 2GR-FE - 50% harder, good to 7700+ with high lift. Needs additional retainers and advice from MWR. Claimed good for 8000rpm with titanium valves and other supporting parts. These also seem to be sold by Komo-Tec under their own brand, but those are the same product for 2x the price.​

​

Wild: Supertech kit by Frankenstein Motorworks - Good to claimed 8300rpm with standard lift cam. Includes retainers and caps.​

​

Unknown: Supertech dual valve springs - unknown specs, part number SPRK-EC3025D-2GR. Very high end product, may be very high performance. No longer in Supertech catalog, but exists in fulfillment warehousing. Needs investigation with Supertech to determine complete spec.​

Hope this helps to open up the topic for discussion. I'm interested to see what others discover, attempt, and achieve.

 

[NoFear99]

6800 is clearly not enough.
With a flash we should be good for at least 7200. ( 7500 would be a sweetspot. )

 

[K_Squared]

Just the Jubu springs with a 7500 redline and soft limiter with a 460 tune would be insane. I don't need it, but it would be insane. I can't imagine what this car would sound like going all the way to 8K RPM.

 

[R35_J]

Like many of you, I'm interested in exploring what options exist for raising the rev limit (safely) once my warranty is done.

At minimum, this involves a reflash of the factory engine management or a replacement of the ECM. Both are currently available, with replacement ECMs (Syvecs) from JUBU Performance and others. Reflashes are currently available or in development from Olympic Motorsports, BOE Fabrications, etc. So there will be technical methods to achieve remapping appropriate to this objective.


From what I've read, the limiting physical factor in increasing engine RPM significantly on the 2GR-FE (as supplied by Lotus) is apparently the valvetrain, specifically the valve springs. There are several options on the market to replace these, in varying degrees of increased performance over the stock valvetrain.

Mild: Jubu Performance valve springs for 2GR-FE - 30% harder, good to 7700rpm on otherwise stock valvetrain.​

​

Moderate: MWR valve springs for 2GR-FE - 50% harder, good to 7700+ with high lift. Needs additional retainers and advice from MWR. Claimed good for 8000rpm with titanium valves and other supporting parts. These also seem to be sold by Komo-Tec under their own brand, but those are the same product for 2x the price.​

​

Wild: Supertech kit by Frankenstein Motorworks - Good to claimed 8300rpm with standard lift cam. Includes retainers and caps.​

​

Unknown: Supertech dual valve springs - unknown specs, part number SPRK-EC3025D-2GR. Very high end product, may be very high performance. No longer in Supertech catalog, but exists in fulfillment warehousing. Needs investigation with Supertech to determine complete spec.​

Hope this helps to open up the topic for discussion. I'm interested to see what others discover, attempt, and achieve.

Just a fair warning about Olympic Motorsports. I live in South Florida and have been screwed over by then years ago. There are tons of horror stories on the forums and FB groups if you search their name. They also just recently totalled a customer's car:


Luiggi, the owner, is known crook and hack.

 

[Porter]

Thanks @R35_J , I've removed the reference until we learn more.

 

[R35_J]

I'm definitely excited to hear more about this. The thought of revving this engine to 7700rpm sounds absolutely amazing.

 

[Hapkin]

Syvecs is expensive but nice plug and play option to 7200 which should be fine since Evora GT/430 went there.

 

[Porter]

Syvecs is expensive but nice plug and play option to 7200 which should be fine since Evora GT/430 went there.

Nice in principle for a million different reasons, but I have many questions about what happens when a US state emissions inspection station plugs into the OBD2 port.

Also, a standalone ECU is a radical departure in running state from a factory tune. Many of us aren't attempting to take on that expense and long term ownership complexity, we just want a factory state of tune that revs higher, with minimal additional considerations. That's a fair thing to want.

 

[GlobalPilot777]

Im following this topic

 

[Dragoon]

 

[jubbalandcars]

I'll be keeping an eye out for updates. Eager to get above 7K RPM. 6800 is a tease

 

[drjazzsk]

i wonder if the rev limit will change if a S or R variant comes out? sure hope so!

 

[VL3X]

i wonder if the rev limit will change if a S or R variant comes out? sure hope so!

As I said in a different thread back in 2022...

They can but didn't "due to emissions," or so we're told. They're just keeping the V6 redline at 6800 for now until a future GT or sportier version comes out and then they'll simply bump the redline to ~7200 and claim it has more power.

The Evora GT redlines at 7k in Tour and 7200 in Sport. Same exact powertrain.

 

[FlyNavy01]

 

[Rupes]

The Evora GT redlines at 7k in Tour and 7200 in Sport. Same exact powertrain.

Seems like this would potentially be a good way to still pass emissions testing on the Emira if the touring redline is still 6800 and sport opened up to 7k+.

 

[Nico]

I drive the JUBU 460 with a rev limit @ 7200 ; it's perfect because on the stock the max output is too close from the rev limiter ; with the kit it feels very natural to witch the gear without need to check the dash.

here a video on track ; and seriously the music become a must have. (still with the OEM Muffler)

 

[GlobalPilot777]

I drive the JUBU 460 with a rev limit @ 7200 ; it's perfect because on the stock the max output is too close from the rev limiter ; with the kit it feels very natural to witch the gear without need to check the dash.

here a video on track ; and seriously the music become a must have. (still with the OEM Muffler)

Sounds amazing. Btw do you have the autoblip fuction aswel? De downshifts are super sharp and consistent..

 

[Racer X]

Is the new redline reflected on the dash, or does it still show a lower 6,800 limit?

 

[Nico]

Sounds amazing. Btw do you have the autoblip fuction aswel? De downshifts are super sharp and consistent..

Hello, no autoblip ; manual and I try to do my best with my feet as we call it in french Talon/Pointe

 

[Nico]

Is the new redline reflected on the dash, or does it still show a lower 6,800 limit?

Yes JUBU manage it so the red line on the dash is also 7,2.