[RickyB]

Im a little new to this whole tuning thing, what is mbt and mtbt?

MBT - Max Brake Torque (which I don't like because it sounds like a metric for the things that stop the car instead of the thing that makes the car go)

MTBT - Minimum Timing for Best Torque (which you can adjust on a brake dyno by increasing timing at a given engine speed/load point until no more significant torque is produced at that point)

 

[thangcu35]

Well it's me again. This time I'm maxing out the GTX2863r to see how much I can squeeze out. What's interesting is that this setup ppears to spool faster, and the entire powerband seems to shift to the left. Same turbo, manifold, exhaust diameter, cams. The head is port matched on exhaust side only.

20 psi and it falls down to 18.5 near redline. Any boost increase after 15 psi, peak power was slowly increasing and only mid range torque was notably gaining. Looking at the compressor map, 19-20 psi would be the pressure the turbo can effectively push the last bit of CFM in the 60% efficency island. Near redline this turbo was going way out of efficiency. I didn't finish tuning ignition timing in the higher rpms before the dyno ran into some computer issues and had to stop the session.

The car is significantly faster with a fat powerband. The turbo is ridiculously responsive for 20 psi and there is no lag when throttle is stomp after 5k rpm.

 

[turbodude]

Damn 260ft lbs at 4k.

 

[mikealike]

thats aswome...

 

[Devil27]

This is very impressive man!

There is a gt28 MR-S here in Vegas and I have to admit at about 330ish whp in its low boost setting, the car was awesome. Felt faster than a buddy of mines 60-1 mr2. Props on the setup. I had no clue the 2ZZ could achieve these numbers so easy unopened

 

[thangcu35]

Had a little fun at a local dyno day. I started in low boost and hit the high boost button around 4800. Vtak kicked in.

http://www.youtube.com/watch?v=yXv9sOuoLt0

 

[Texas_Ace]

What were the differences in boost? Impressive how fast it responded. Almost 100hp in under 200 rpms.

 

[thangcu35]

11psi low to 20psi. Made a bit more than my first tune, rings seated better I suppose.

 

[Texas_Ace]

Nice, goes to show that it is not boost limited yet if it is still picking up that kind of power per psi and the tune is safe.

 

[turbodude]

that thing must kick.

 

[daddylonglegs]

Man, this really makes me want to get a Spyder and turbo it. I'd probably be happy with less than 250whp on the 1zz with as light as they are.

 

[turbodude]

i really want a mrs with a turbo k20.

 

[Gandalf]

VERY impressive.
How's the tranny situation?

 

[thangcu35]

I installed a Helical LSD, 3.9FD and also upgraded 3rd/4th gear to something beefier. It's holding so far. 4th tops out at 132mph and that works out nicely with what I plan on trapping in the 1/4.

 

[thangcu35]

i really want a mrs with a turbo k20.

Unless we're looking for peaky power 1000+hp, I don't see why the 2zz can't deliver. If we're talking all motor car, I can see why a K24/20 is the better choice.

 

[thangcu35]

Also got beefier exhaust tips on it now

 

[jeffg213]

Just came across this. Love this car. You don't happen to have any video of the exhaust sound do you? I was thinking of using this muffler on a 4th gen 3s and am curious as to how it sounds.

 

[Fool83]

this is pretty sweet.... makes me want to build one.

 

[stickyfingers]

Dude, sick spyder and great job on the build/tuning. You know your stuff!

I wonder what the limitations are on the stock 2zz rods.

 

[supercharged111]

I'd say you've come a ways since the SC14'd MKI.