2gr standard ecu speed limit?

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Re: 2gr standard ecu speed limit?

Post by gavsdavs »

It's affected by your tyre sizes

The stock 2GR rpm limit is 6250rpm and this is a bit limiting on an E153, but it should get you to ~150ish (depending on your tyre sizes).

I'm a bit surprised you have an E153 in the celica.

What are the tyre sizes of the front wheels ?


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Re: 2gr standard ecu speed limit?

Post by MR2DI4 »

You can get really cheap rpm guages the type used to setup chainsaws so for both 2 and 4 stroke. They have a bit of wire hanging out of them like an aerial you just put close to or run a turn or two around the ht lead.
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Re: 2gr standard ecu speed limit?

Post by MR2DI4 »

jimi wrote: 30/07/21 10:37 That'll why Lotus used it in the Evora and supercharged versions in the Exige and Emira ;)
Sure but Lotus are not going down the local wreckers and pulling out a Camry engine to stick in it are they ?

That's like comparing my stock 3SGTE to a 350hp forged build.

You can make any engine better if you throw enough money at it.

The original engine is built with a certain characteristics to match the application there is no getting away from that.

Pretty sure if you could have got the Nissan GTR V6 into it the 2gr engine would go in the bin. It's all relative.

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Re: 2gr standard ecu speed limit?

Post by Fuppylodders »

Well, I don't need to check the calibration anymore. It wasn't even 7500. Rev gauge shows bang on 8k when it hits limit. I know for a fact thats wrong, so my original question still stands :(
Anyone who has an untouched ecu, feel free to mention what your top speed is in 5th :)

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Re: 2gr standard ecu speed limit?

Post by Fuppylodders »

gavsdavs wrote: 30/07/21 22:30 It's affected by your tyre sizes

The stock 2GR rpm limit is 6250rpm and this is a bit limiting on an E153, but it should get you to ~150ish (depending on your tyre sizes).

I'm a bit surprised you have an E153 in the celica.

What are the tyre sizes of the front wheels ?
225/45/17

The E153 was a last minute swap in for various reasons
Also, thanks, I'd forgotten all about mentioning tyre sizes! That would help :facepalm:
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Re: 2gr standard ecu speed limit?

Post by jimi »

The trouble is you don't know what your rpm actually is, so you you could be hitting the rev limit.
You know your rev counter is indicating 8000, you know that's wrong, but you don't know what your actual rpm is.
That's why I suggested another rpm meter that picking up from a rotating part so you can find out what rpm your engine is actually doing, then you can go from there.
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Re: 2gr standard ecu speed limit?

Post by Fuppylodders »

jimi wrote: 01/08/21 9:30 The trouble is you don't know what your rpm actually is, so you you could be hitting the rev limit.
You know your rev counter is indicating 8000, you know that's wrong, but you don't know what your actual rpm is.
That's why I suggested another rpm meter that picking up from a rotating part so you can find out what rpm your engine is actually doing, then you can go from there.
Oh, I certainly am hitting the rev limit, that's for sure.
But even if I knew my rpm was limiting at the standard 6250, I still don't know if the top speed is what I should be achieving with the size tires/unmodified ecu/e153 gearbox. I've a concern that the 5th gear ratio has been swapped out.

Even if I do find out what mine is at, I still need to know what others are able to do in their unmodified ecu's.
Then I'll know if my gearbox has a standard 5th gear, or if its been swapped and I need to be changing the gearbox over.
I shall still be getting a rpm counter to find out where mine is at.
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Re: 2gr standard ecu speed limit?

Post by peteV6R5 »

2 min google search e153 conversion rpm to speed in mr2 (also s54 for info)
so 6250 2gr around 140mph depending on tyres etc

e153 -@1000 -@2000 -@3000 -@4000 -@5000 -@6000 -@7000
1st 5.0mph 10.0mph 15.0mph 20.0mph 25.0mph 30.0mph 34.9mph
2nd 8.4mph 16.7mph 25.1mph 33.4mph 41.8mph 50.1mph 58.5mph
3rd 12.4mph 24.8mph 37.2mph 49.6mph 62.0mph 74.4mph 86.8mph
4th 17.4mph 34.8mph 52.2mph 69.6mph 87.0mph 104.4mph 121.8mph
5th 21.8mph 43.7mph 65.5mph 87.4mph 109mph 131.1mph 152.9mph

s54 -@1000 -@2000 -@3000 -@4000 -@5000 -@6000 -@6300
1st 5.0mph 10.0mph 15.0mph 20.0mph 25.0mph 30.0mph 31.4mph
2nd 8.4mph 16.7mph 25.1mph 33.5mph 41.8mph 50.2mph 52.7mph
3rd 12.4mph 24.8mph 37.2mph 49.6mph 62.0mph 74.4mph 78.1mph
4th 16.0mph 31.9mph 47.9mph 63.8mph 79.8mph 95.7mph 100.5mph
5th 20.0mph 40.0mph 60.0mph 80.0mph 100mph 120mph 125.9mph
https://www.mr2oc.com/threads/rpm-gear-mph.95797/
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Re: 2gr standard ecu speed limit?

Post by Fuppylodders »

peteV6R5 wrote: 01/08/21 10:29 2 min google search e153 conversion rpm to speed in mr2 (also s54 for info)
so 6250 2gr around 140mph depending on tyres etc

e153 -@1000 -@2000 -@3000 -@4000 -@5000 -@6000 -@7000
1st 5.0mph 10.0mph 15.0mph 20.0mph 25.0mph 30.0mph 34.9mph
2nd 8.4mph 16.7mph 25.1mph 33.4mph 41.8mph 50.1mph 58.5mph
3rd 12.4mph 24.8mph 37.2mph 49.6mph 62.0mph 74.4mph 86.8mph
4th 17.4mph 34.8mph 52.2mph 69.6mph 87.0mph 104.4mph 121.8mph
5th 21.8mph 43.7mph 65.5mph 87.4mph 109mph 131.1mph 152.9mph

s54 -@1000 -@2000 -@3000 -@4000 -@5000 -@6000 -@6300
1st 5.0mph 10.0mph 15.0mph 20.0mph 25.0mph 30.0mph 31.4mph
2nd 8.4mph 16.7mph 25.1mph 33.5mph 41.8mph 50.2mph 52.7mph
3rd 12.4mph 24.8mph 37.2mph 49.6mph 62.0mph 74.4mph 78.1mph
4th 16.0mph 31.9mph 47.9mph 63.8mph 79.8mph 95.7mph 100.5mph
5th 20.0mph 40.0mph 60.0mph 80.0mph 100mph 120mph 125.9mph
https://www.mr2oc.com/threads/rpm-gear-mph.95797/
I wish I knew how you got those numbers...
I typed mine in a calculator, and get this (pretty similar as I previously have gotten in calculators which is part of my cause for concern) :
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Re: 2gr standard ecu speed limit?

Post by Fuppylodders »

I'll add, for the above screen shot, those numbers do seem to be correct (absolutely close enough) with respect to top speeds in gears 1-4, but 5 throws it all up in the air and doesn't match the speed I'm at when I limit out.
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Re: 2gr standard ecu speed limit?

Post by gavsdavs »

Fuppylodders wrote: 01/08/21 10:24 I've a concern that the 5th gear ratio has been swapped out.
You're mixing things up. You can't swap 5th on an E153. You can on an S54, but not on an E153.
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Re: 2gr standard ecu speed limit?

Post by gavsdavs »

FWIW, stock MR2 rear tyre sizes are 225/50/15
or more often seen these days: 245/40/17

I run a 245/40/17 and it's within 1% of GPS speed (but then i no longer use an E153 so it may be irrelevant)

You are running 225/45/17, i'm not sure if that's a smaller rolling circumference to a 225/50/15
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Re: 2gr standard ecu speed limit?

Post by gavsdavs »


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Re: 2gr standard ecu speed limit?

Post by Fuppylodders »

gavsdavs wrote: 03/08/21 21:37 FWIW, stock MR2 rear tyre sizes are 225/50/15
or more often seen these days: 245/40/17

I run a 245/40/17 and it's within 1% of GPS speed (but then i no longer use an E153 so it may be irrelevant)

You are running 225/45/17, i'm not sure if that's a smaller rolling circumference to a 225/50/15
24.97 is the tire diameter of 225/45/17
23.86 is the diameter of 225/50/15
So the 15 sliiiiiightly smaller.

Also, I do believe the e153 5th gear can be swapped out easily. I've been told by a few people already it can (I'm only talking from what I've been told, I don't want to say you're wrong, but what I've been told and shown in a video does lead me to believe it can be done)
Video of an e154f (I know, not an E153 but essentially the same, just with a transfer case on it)
5:11 to 6:55
https://youtu.be/L_X4M8c9kpM
Nothing else needs to be removed. At that point, 5th gear can be swapped out with another. I'd previously had inklings there may be an e53 5th gear in mine, as it matches the ratio to speed to the assumed rev limit of 6250 almost perfectly.
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