who says that? and are they just saying it, or do they actually have logs to back it up?

 

Just browse this thread I think people have proof, but I think they have strokers/ported heads.

 

Your results look almost identical to mine with the 2.0 engine.... looking good!

Keith

 

I agree with Keith. Looks good to me. Just to see side by side the difference in spool, here is a fourth gear pull of my car with the 2.3 and yours with the 2.0. I set the cursor at the same place you reached full boost (around 19.2psi). It comes out to a little over 600rpm sooner spool up.

 

My spool up is pretty close to yours, Always.

 

thanks for the feedback. Smoggy your car spools pretty quick.

I actually think I could hit 9psi sooner if the boost was set higher. Between 3500 - 4000RPM the car goes from 8.5psi to 16psi (7.5psi difference) yet from 4000-4500RPM the boost only slowly increased to 19psi (about a 3psi difference).

If only I could find a way to keep the WG shut longer...

 

Just for the heck of it I went back and looked at some AEM data logs from when I was running my 03 EVO with the stock turbo (9.8 exhaust housing) and compared them to data logs of my 05 with the GT 35R (.63 A/R exhaust housing) and then plotted the boost pressure VS RPM for each at 100 RPM increments in an Exel file with the following results.

Keith

 

Funny, it looks kinda like a hp/tq graph. Good info Keith.

 

I am willing to add other peoples data to my chat like the DSMmotorsports chart, but mine is for 3rd gear instead of 2nd.

To me 2nd gear doesn't give enough load for good data, and most people are not willing to do a 4th gear pull from 2000 RPM to redline on the street..... so I have to say a 3rd gear chart is our best option. Also, I will only use "on the street" data since dyno's don't load an engine the same way as actual driving the car does.

Anyone wanting their data added to the chart please post up

Keith

PS: Smog, do you have good data on a pull from 2000 RPM up to redline in 3rd gear on the street (not a dyno) that I can add?

 

Yes. I'll post it up now.

 

Can you use the spreadsheet and measure the area under the two curves? I would like to see how much of a difference there really is. Thanks....

 

Here is a third gear pull from 2000 rpms on the street.

2000 0
2200 0
2400 .6
2600 1.2
2800 1.8
3000 2.7
3200 3.7
3400 5
3600 6.8
3800 9.3
4000 12.7
4200 16.3
4300 18.5
4400 20
4600 20.7
4800 20.3
5000 20.5
5200 20.6
5400 20.9
5600 20.9
5800 20.7
6000 20.6
6200 20.9
6400 21.1
6600 21.1
6800 21.3
7000 21.1
7200 21.2
7300 21.1

 

Here is the new chart. I had to "interpolate" data points where your provided data had gaps since most of it was in 200 RPM increments, but it came out really good. As anyone with eyes can now see, the GT-35R on a 2.0 spools up right around 1000 RPM's after the stock turbo does on a 2.0 liter and the GT-35R on a 2.3 liter setup splits the difference, 500 RPM slower than the stock turbo and 500 RPM faster spoolup than the GT-35R on a 2.0 engine.

Keith

 

Pretty cool Keith. Good info. That data comes from my Zeitronix ZT2 log.

 

Depends is your a stroker or not. I could of sworn my car starts pulling like hell at 3300rpm.