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I have 8:1 compression so Im eager to see what 25 psi yields too! ps - my car is for sale, AND UNTUNED Jim :"The Pacemaker", or "The Peacekeeper" or "The International Color of Black"... just kidding, Z1... onto the post... ;)
:Recall my post on 12/22 about my Sport 500 build:
:[ http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=1440659 ]
:
:Car:
:Black 1994TT 5-speed with 80k, built by Z Car Garage, tuned with the help of Seb and Greg Dupree, parts from CZP
:Previous numbers: 300RWHP and 315RWTQ at 16psi, yet it clicked through the 1320' at 110mph. My G-tech runs were right around 112mph.
:Only changes were the turbos and dual-POP
:Modifications:
:Sport 500 Turbos
:JWT dual POP, ECU, and Genie Turbo Exhaust
:3" Custom ZCG Divorced Stainless Steel Downpipes
:S-AFC2 Air/Fuel Controller
:Profec B Boost Controller
:Stock: Bottom end, Manifold, Cams
:4th gear dyno pulls
:2 hours of dyno, 13 total pulls on this first go-around:
:Dyno start time: 10:30am, 69.2F, RH=48%
:Low boost (12psi)/base timing: Baseline run
:367RWHP peak
:356RWTQ peak @ ~3750RPM
:AFR very rich above 4000RPM
:
:With some clean-up, and a solid 11.5AFR:
:375RWHP peak
:357RWTQ peak @ ~3800RPM
:
:Low boost before and after fuel management before richening up the AFR to move from 11.9:1 to 11.5:1:
:
:This is fuel program 1 used on the S-AFC2, and is used for commuting to track events on 91 octane or general running around. Now for the 100 octane tune:
:Current conditions: 74F, RH=38%
:High boost (24psi)/base timing: Baseline run
:466RWHP peak
:506RWTQ peak @ ~4700RPM
:
:High AFR -> Backoff on the boost and begin tuning with fuel and timing. A few runs later, my Z mammothed this curve:
:22psi boost
:489RWHP peak
:525RWTQ peak @ ~4750RPM
:
:Comparison:
:Hi-boost baseline, RED (24psi - no tune) and tuned, BLUE (22psi):
:
:Hi-boost, but a little richer for 12.0:1 AFR:
:
:
:And to answer the question of exhaust cutouts making power or not (keep in mind I have no catalytic converters):
:Open exhaust (cutouts open):
:
:I ran a conservative 16ish psi at the Laguna Seca event I drove a few weeks ago with only 2 degrees of timing advance. I don't have a curve for this, but I presume it's somewhere around a conservative 400RWHP based on the surrounding numbers and conditions we were able to obtain data on.
:Preliminary G-tech numbers increased from ~112mph trap speed to 125(!)mph trap speed. This is not a drag car, but I like to have the numbers for comparison purposes.
:Thanks for reading,
:SS
 
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18:08:08 01/03/05
