Rev 2 3S-GTE reving

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.

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?

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.

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.

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.

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
 
 

 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.
 

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