I went out and did a few pulls this afternoon to get some turbo spool-up data. It was 80 degress out and I was on 91 octane, running just under 21 psi and 10.8:1 AFR. I logged when I reached 20psi as a fair representation full spool up for pump gas applications. FYI, I have re-installed my Xede piggyback ecu recently.

Here is 5th gear:



Here is 4th gear:



Here is 3rd gear:



Here is 2nd gear:


I must say that the Zeitronix Zt2 is somewhat of a heartbreaker in terms of bragging about spool up. I still have my Omori gauge hooked up as well and it shows spool to be somewhat quicker. In any event, this is very close to being REAL accurate data about 35R + 2.3 street spool up. Thanks again to Alfred at Tuning Technologies for the great tune.

Your thoughts and comments?

 

looks money to me man.

 

I am sure that you have already done this, but can you give your driving impressions?

 

I'll tell you one impression: Although I picked 20psi for this thread, once its over 15psi, the car pulls really hard and is making tons of power.

 

I learned that first hand as well. Even at 10 psi this thing starts pullin pretty hard. I think thats where people get misinformed with big turbos. Too many people believe 20 psi is 20 psi. You need to actually drive a car with a big turbo in it to really understand how it feels compared to a small turbo. It pulls harder sooner(in terms of PSI) so when your at 20 psi on the stocker it feels like 15 psi on a 35r.

 

^^^Precisley...thats why I am going to do the BB T67 without question!

 

which is why turbo lag is overrated

 

I still think the GT35R on a 2.0 is a little big for everyday driving, but the 2.3L definitely seems to make it 100% usable. Without any doubt when I get some money I will do the 2.3/35R combo... looks like gold.

 

i get the same issue here with the zt2. even though i know i am spooling up at ~2900 rpm, the software shows full spool up around 3200 rpm. i dont know why that is..

 

It's because you ARE reaching full spool at 3200 rpm. Looking at a boost gauge and your tach is not a good way to judge because as soon as you get beyond 10 psi they both move far too fast to judge accurately.

-Paul

 

It looks to me that spool up is only like 200 rpm sooner than on a 2.0 ltr.

So in conclusion, Soon2BEvo, how can you say it's to big? Most people can't tell the difference between 2-3 hundred in spool up anyway, esspecially not at those power and boost levels.

I am beginning to think the 2.3 is overrated in the spool conversation, though for torque it is well worth it.

 

smoggy, can you post at what RPM you went WOT for each gear...

 

Looks like a nice safe conservative 91 pump gas tune.

 

200rpm? I dont know about that. Maybe you can show me logs of GT35R fully spooled on a 2.0 @ 4500rpm. Most dyno's Ive seen show spool to be near 5000rpm which to me is unacceptable.

Doug@Topspeed had this dyno comparison. The midrange torque on the stroker just obliterates the 2.0. Not even on this but look at the 50trim guys running stokers.

Most 50trims make 475-500whp with 415-435tq. The 2 stokers I saw had torque of 480 and 490. That is incredibly significant and will make driving around a lot more fun.

 

Also, I think a whole lot of emphasis is put on the RPM a turbo spools up at but how many people actually floor their GT35R cars at 3500rpm and wait for it to spool? Id like to see how fast the turbos react when you nail the gas at 4500 or 5000. I think the stroker would really start to shine there.