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

Wykydtron · 12-30-2006, 11:54 AM

I know this is kinda stupid to bring up, but is the MAF in/out sensor settings configured correctly?

Wouldn't 15psi be pushing it for a stock turbo? Just a lil bit?

Whats your timing set at?

This is kinda kewl, thanks for posting.

sean350z · 12-30-2006, 12:05 PM

Yea the SAFC is set correctly to S15 MAF in S15 MAF out. I think the max efficiency is around a bar maybe a little higher. I can't complain at almost 17 hp/psi but just wondering about the A/F ratio and SAFC settings. Almost 15.5 A/F at 4300 rpms scares me. Timing is almost at 15 BTDC.

sean350z · 12-30-2006, 12:10 PM

Just for kicks here's 7psi low boost

Blue - With SAFC
Red - Completely stock

sean350z · 12-30-2006, 01:59 PM

The damn thing hiccuped again today on a 3rd gear WOT pull around 4500-5000 rpm at 15psi. I think I need a Z32 MAF.

smelly240 · 12-30-2006, 03:39 PM

get a wideband and a z32 maf

i've had a dyno tell me i was at 14:1 pouring black smoke... maybe the filter is bad or something???

punxva · 12-30-2006, 06:35 PM

yea grab a n62 aka a z32 maf and retune for it with a wideband, because they might not have the wideband calibrated correctly or the numbers are different because of airflow from actually being on the road, that happened to me while tuning my ka-t setup

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 __________________

12-30-2006, 11:54 AM	#2
Wykydtron Zilvia Addict Join Date: Oct 2006 Location: Skykomish, WA Posts: 909 Trader Rating: (0) Feedback Score: 0 reviews	I know this is kinda stupid to bring up, but is the MAF in/out sensor settings configured correctly? Wouldn't 15psi be pushing it for a stock turbo? Just a lil bit? Whats your timing set at? This is kinda kewl, thanks for posting. __________________ @schassis.eddi

12-30-2006, 12:05 PM	#3
sean350z Zilvia Addict Join Date: Nov 2005 Location: Downingtown, PA Posts: 890 Trader Rating: (5) Rides Gallery: sean350z Feedback Score: 5 reviews	Yea the SAFC is set correctly to S15 MAF in S15 MAF out. I think the max efficiency is around a bar maybe a little higher. I can't complain at almost 17 hp/psi but just wondering about the A/F ratio and SAFC settings. Almost 15.5 A/F at 4300 rpms scares me. Timing is almost at 15 BTDC. __________________

12-30-2006, 12:10 PM	#4
sean350z Zilvia Addict Join Date: Nov 2005 Location: Downingtown, PA Posts: 890 Trader Rating: (5) Rides Gallery: sean350z Feedback Score: 5 reviews	Just for kicks here's 7psi low boost Blue - With SAFC Red - Completely stock __________________

12-30-2006, 01:59 PM	#5
sean350z Zilvia Addict Join Date: Nov 2005 Location: Downingtown, PA Posts: 890 Trader Rating: (5) Rides Gallery: sean350z Feedback Score: 5 reviews	The damn thing hiccuped again today on a 3rd gear WOT pull around 4500-5000 rpm at 15psi. I think I need a Z32 MAF. __________________

12-30-2006, 03:39 PM	#6
smelly240 Nissanaholic! Join Date: Oct 2006 Location: Philaburbia Age: 47 Posts: 2,137 Trader Rating: (4) Feedback Score: 4 reviews	get a wideband and a z32 maf i've had a dyno tell me i was at 14:1 pouring black smoke... maybe the filter is bad or something???