Dyno chart help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sean350z · 12-30-2006, 11:38 AM

My setup:

S15 SR20det SpecR 15psi
Stock MAF, Injectors, Manifolds
NGK BK 7s (gapped 30)
FMIC
Walboro
SAFC

The dyno

Blue - No SAFC settings A/F Ratio high point = 15.6 @ 4300
Green - SAFC settings (see below)

Throttle - 10% Low (no settings on points) 50% High (settings below)

2800 - +2
3400 - +3
4000 - +6
4600 - +7
5200 - +7
5800 - +7
6400 - +7
7000 - +7
7600 - +8

Questions - When we tried to increase fuel at 4000 rpm past a certain point the engine would hiccup. Is this because of the stock MAF? Also are these A/Fs not very accurate b/c of they used a tailpipe sniffer? I'm very very impressed with the highest torque values even at 3700 rpm

but everything seems to fall off around 5800 rpm. Why the hell would the SAFC settings make me loose 20hp and around 10ft/lbs?

Thanks

12-30-2006, 11:38 AM	#1
sean350z Zilvia Addict Join Date: Nov 2005 Location: Downingtown, PA Posts: 890 Trader Rating: (5) Rides Gallery: sean350z Feedback Score: 5 reviews	Dyno chart help My setup: S15 SR20det SpecR 15psi Stock MAF, Injectors, Manifolds NGK BK 7s (gapped 30) FMIC Walboro SAFC The dyno Blue - No SAFC settings A/F Ratio high point = 15.6 @ 4300 Green - SAFC settings (see below) Throttle - 10% Low (no settings on points) 50% High (settings below) 2800 - +2 3400 - +3 4000 - +6 4600 - +7 5200 - +7 5800 - +7 6400 - +7 7000 - +7 7600 - +8 Questions - When we tried to increase fuel at 4000 rpm past a certain point the engine would hiccup. Is this because of the stock MAF? Also are these A/Fs not very accurate b/c of they used a tailpipe sniffer? I'm very very impressed with the highest torque values even at 3700 rpm but everything seems to fall off around 5800 rpm. Why the hell would the SAFC settings make me loose 20hp and around 10ft/lbs? Thanks __________________