Doing 550s and MAF. Tuning question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sr20tom · 01-08-2006, 07:58 PM

I just installed my AEM uego and got the chip soddered in for the apex 550's and a z32 that i have but i soddered the chip in first and it has a setting for stock injectors and stock maf but higher boost. Now when i run on 7psi, the uego reads 11.5 steady and it runs beutifully. Now when i bump the boost upto 15psi, the gauge goes past the 11, into mid and high tens. When i punch it on the highway, the car bogs and shoots out flames. A boost leak and a vaccum is not the problem because with that the car bogs at 7 psi too. Now the car runs on low boost like a dream. I am doing the 550's and the Z32 maf tomorrow. What should SRs be tuned to?? I tuned the B series to 12.5, but have no clue where the SR likes to be. I am about to pull the chip out and see where the stock settings are and street tune the 550s to the map.

Nismo180 · 01-09-2006, 01:29 PM

Let me see if I got this straigt, you put a 550s and Z32 burnt chip in your ECU, and with the stock MAF and injectors it's running crappy and your confused by this? Put the Z32 and 550s on there then see how it runs. 11.5:1 is safe, it's not extreme and it's not really conservative. getting into the 12:1 and 12.5:1 area is really starting to create hotter combustion events and on a street tune is definatly not worth it. At least not without a standalone, a wideband, and a very knowledgable watchful eye.

01-08-2006, 07:58 PM	#1
sr20tom Leaky Injector Join Date: Dec 2004 Location: Queens Posts: 147 Trader Rating: (0) Feedback Score: 0 reviews	Doing 550s and MAF. Tuning question I just installed my AEM uego and got the chip soddered in for the apex 550's and a z32 that i have but i soddered the chip in first and it has a setting for stock injectors and stock maf but higher boost. Now when i run on 7psi, the uego reads 11.5 steady and it runs beutifully. Now when i bump the boost upto 15psi, the gauge goes past the 11, into mid and high tens. When i punch it on the highway, the car bogs and shoots out flames. A boost leak and a vaccum is not the problem because with that the car bogs at 7 psi too. Now the car runs on low boost like a dream. I am doing the 550's and the Z32 maf tomorrow. What should SRs be tuned to?? I tuned the B series to 12.5, but have no clue where the SR likes to be. I am about to pull the chip out and see where the stock settings are and street tune the 550s to the map. __________________ 91 SRtweezy powered sil-80

01-09-2006, 01:29 PM	#2
Nismo180 Leaky Injector Join Date: Jan 2005 Location: Bonney Lake, WA Posts: 105 Trader Rating: (0) Feedback Score: 0 reviews	Let me see if I got this straigt, you put a 550s and Z32 burnt chip in your ECU, and with the stock MAF and injectors it's running crappy and your confused by this? Put the Z32 and 550s on there then see how it runs. 11.5:1 is safe, it's not extreme and it's not really conservative. getting into the 12:1 and 12.5:1 area is really starting to create hotter combustion events and on a street tune is definatly not worth it. At least not without a standalone, a wideband, and a very knowledgable watchful eye.