Rev 2 3S-GTE reving

Re: Rev 2 3S-GTE reving (mr2y)

Sat, 12 Dec 2015 21:31:26 GMT

TonyMR2
What I have been told is there is two speedo gear wheels (one for the 180 cluster and one for the 240 cluster).

I don't think that's right. It'll be the same speed cable for both speedos because the ECU reads the speed from the sensor in the speedo. The 240 cluster will just have a stronger spring for the needle.

Re: Rev 2 3S-GTE reving (kojab)

Sat, 12 Dec 2015 20:19:25 GMT

That was a good fix. Catching up to me now. lol

Re: Rev 2 3S-GTE reving (mr2y)

Sat, 12 Dec 2015 18:16:50 GMT

I just replaced both 10uF electrolytic capacitors in the tacho with Jaycar ones (63 volt 105 deg C) and I can rev it to 7400 without hitting the limiter. Idles at 900 now... might be a touch high but that's better than being 1400 too low.

Edit: mines a 1990 GT model BTW, Japanese import.

Re: Rev 2 3S-GTE reving (SL loon)

Sat, 12 Dec 2015 16:12:00 GMT

I am new to MR2s only buying my first one 4-5 months ago. I have recently bought a 1992 JDM Rev2 GT & also have a 1991 NA which I think is also a Rev2 & neither of them seem to want to rev past 6000rpm. the 91 NA gets a bit noisey past 5000-5500rpm & revs slowly ,the 92 turbo is quieter over 5000rpm & will rev to 6000 but power starts to drop off by then anyway,due I believe to a combination of the CT26 turbo & exhaust being too restrictive.

Re: Rev 2 3S-GTE reving (mr2y)

Tue, 08 Dec 2015 09:46:21 GMT

I'll try replacing the capacitors for the tacho in the cluster. Seems like a common thing with the MR2s.

Re: Rev 2 3S-GTE reving (kojab)

Tue, 08 Dec 2015 08:40:09 GMT

just_ace
What will they rev too? Or what would rpm would peak power be at?

Anecdotely the ct20b happliy flows over what the cams/ecu allow. My gt4 would rev cleanly to redline, but i wasnt running 21lbs which i think is a bit much for the std gen3 and 20b.

Just my opinions tho.

I don't know what the redline is on GT4. I have tuned this ST205 to 7800 rpm and it pulls hard to this in 1st and 2nd gears. Will do more tuning at MTC where I can see whats happening in the higher gears. Not sure but does the CT20B come standard on the ST205 engine? Could the cams be different than what the 3SGTE SW20's have?

I know I am pushing it with regards the tune, especially at 21lbs. I am always looking for signs of knock on my logs. It seems very happy so far.
I have tuned thousands of EFI engines but never a 3SGTE. Its a great engine.

Apologies for hijacking your thread mr2y

Re: Rev 2 3S-GTE reving (mr2y)

Mon, 07 Dec 2015 20:45:07 GMT

I've uploaded the video of it doing a 2nd gear pull 40-100 (remember it's 10kmh higher than what it reads too, so I'm hitting like 120 in 2nd gear). I think you can see a problem in the video. To me it seems the tachometer is reading way too low and it's possibly hitting the rev limiter at "6000". Any thoughts?

https://www.youtube.com/watch?v=ss4yLnLRTpc

Edit: oh for the record I'm a guy, the car is named Emma

Re: Rev 2 3S-GTE reving (mr2y)

Mon, 07 Dec 2015 17:02:14 GMT

Definitely not speedo or gearing, I have ruled that out. I was confused because it appears to have a completely different torque curve to factory, and the top of my 3rd gear was coinciding with the bottom of the stock 3rd gear. Just different locations of torque in the rev range as far as I can tell, but I'm wondering if there is a problem still.

MaXim
Could be worth going once over the fuel system. I once had an S13 that did not like revving past 5k at all until I changed the fuel filter.

Good point I'll take a look.

TonyMR2
Puff or revs relates to flow of your set up and tuning, everyone's will be different depending on mods.

It's either tuned for much lower RPM torque (if that's possible) or it's got some fuel or spark issues in higher RPM.

Edit:

just_ace
What will they rev too?

Just my opinion based on the youtube video, it appears to have usable power up to 7000, whereas mine does not feel usable at all, just makes noise.

Re: Rev 2 3S-GTE reving (Guest)

Mon, 07 Dec 2015 16:22:07 GMT

My speedo is out 10kms per hour and reset the needle for 100kms per hour based on GPS. What I have been told is there is two speedo gear wheels (one for the 180 cluster and one for the 240 cluster). If your gearbox has the wrong speedo gear to cluster they will be out. Haven't done a swap to see if it's true, but that's what I have been told.
Puff or revs relates to flow of your set up and tuning, everyone's will be different depending on mods.

Re: Rev 2 3S-GTE reving (mr2y)

Mon, 07 Dec 2015 16:11:43 GMT

Ok I MAY be a peanut head and got my gears confused. The stock one in the video is also doing 100kph at 5250 RPM in 3rd gear. That seems to match mine, but my problem is the higher revs. It just doesn't rev over 5000 like this one. I'll take a new video because the one I had was not from a standing start.

Re: Rev 2 3S-GTE reving (just_ace)

Mon, 07 Dec 2015 15:54:16 GMT

What will they rev too? Or what would rpm would peak power be at?

Anecdotely the ct20b happliy flows over what the cams/ecu allow. My gt4 would rev cleanly to redline, but i wasnt running 21lbs which i think is a bit much for the std gen3 and 20b.

Just my opinions tho.

Re: Rev 2 3S-GTE reving (MaXim)

Mon, 07 Dec 2015 15:45:28 GMT

Could be worth going once over the fuel system. I once had an S13 that did not like revving past 5k at all until I changed the fuel filter.

Re: Rev 2 3S-GTE reving (mr2y)

Mon, 07 Dec 2015 15:41:22 GMT

Can anyone confirm the rev 2 accelerates nothing like this:

Exhibit A fully stock: https://www.youtube.com/watch?v=BII5j1XbBcA

I will post up exhibit B once I take a decent video of it, but my rev 2 is absolutely nothing like that.

Edit: I found a video of mine, and it does 100kph in second gear at 5250 RPM, whereas this one doesn't even do 100kph in 2nd.

Re: Rev 2 3S-GTE reving (kojab)

Mon, 07 Dec 2015 14:10:32 GMT

just_ace
5500rpm is what a stock gen2 turbo motor tends to run out of puff at. Combination of turbo and cams.

What engine speed would you expect a standard ST205 gen3 with a CT20B turbo and tuned to 21lb boost rev to?

Re: Rev 2 3S-GTE reving (just_ace)

Mon, 07 Dec 2015 13:07:18 GMT

5500rpm is what a stock gen2 turbo motor tends to run out of puff at. Combination of turbo and cams.