PeakBoost

i've been getting a ton of inquiries on the response and recovery of our new BBTO4R.
so i decided to take our EVO out and datalog some spool times and boost recovery between shifts. stock '05 EVO8 with a PeakBoost kit and hYdra EMS 2.5.

the turbo is our newest creation, using the TO4R compressor wheel, mated to a .63 a/r, stg3, t3 turbine and a dual stainless steel ballbearing cartridge. thats a mouthfull
the compressor flow is 75lbs/min, whereas the GT35R is 61lbs/min. this equates to more power per lb of boost, with a very similar spool and more supportable power.

3rd gear:
AFR RPM TPS BOOST(psi)

11.2/4500/101.2/11.2
11.4/4600/101.6/12.5
11.2/4700/101.6/14.4
11.4/4800/101.6/16.2
11.2/4900/101.6/18.4
11.1/5050/101.2/20.3


full boost @ 5000rpms! however, 11lbs has with this turbo feels like 15lbs with the GT35R, due to the greater air volume. the car starts to really feel like its moving @ 4500

beyond the intial quick spool for a such a big turbo (66.5mm inducer), the best part is the recovery time between shifts.

3rd gear to 4th gear shift:

RPM TPS BOOST(psi)

6050/101.2/22.2
6300/101.2/23.4
6500/101.2/24.3
6700/101.2/24.6
6950/101.2/25.3
7150/101.2/25.6
7350/99.2/25.6
7300/9.6/6.9
6550/82.0/7.8
5300/101.2/14.0
5500/101.2/18.4
5700/101.2/21.5

notice, the TPS, i even lifted fully between shifts and still maintained boost pressure off the throttle due to the shaft speed. once the next gear was engaged, 14psi starting, and within 400rpms right back to full boost!


i thought you guys might find this interesting, let me know what you think.


Ken Peak

ValleySyder

is it a t3 turbine housing or t4 ? so basically this turbo is a t67 ball bearing ?

Turbocivic94

To me it looks like T3

Good responsive turbo

PeakBoost

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ValleySyder &raquo;</TD></TR><TR><TD CLASS="quote">is it a t3 turbine housing or t4 ? so basically this turbo is a t67 ball bearing ?</TD></TR></TABLE>

yeah, its a .63 a/r stg3 t3 turbine

no more falling on your face in the next gear...

non-VTEC

hmmmmm........sounds nice........whats the cost of the BBT3/TO4R?

lucidvtec

cost of this turbo

would this do good
on a fully built 2.0gsr 9.5:1

i'm looking for a quick spool but don't wanna lose the top end