I have recently acquired a 1990 SW20 with a rev 2 engine swapped in. I notice the speedo is 10kph too low, but even when compensating for that something seems a little out with the tacho. I'm not one to live in the high rev range (in fact I like the low end power I'm getting currently), I'm more curious about the setup. Watching videos of stock MR2s acceleration I notice they happily continue to rev up to 7000 but mine seems to "run out of breath" up around 5000 rpm. It will get to 5k and then just hover there slowly climbing as I ring it's neck wondering what's happening. I pushed it one time to over 6000 and something cut out (spark maybe?) so I haven't been there ever since because I don't want to damage anything. Dudeman might be able to enlighten me as I believe he put in a new intercooler and it also has some sort of piggy back ECU setup. Just curious as always, I'm hoping to learn as much as I can about it and maybe dabble in tuning. Being an IT guy I'm told by mechanics I should be able to pick up learning modern engines.

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

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?

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.

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.

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.

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.

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.

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.

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