Drivetrain Problems with big bore TB
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5th Gear
Joined: May 2005
Posts: 836
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From: Los Angeles
Problems with big bore TB
I have a MCS with basic mods and JCW injectors. Ever since I installed a 62 mm TB back in 2005 the car runs very lean at high rpms. From 6,000 to redline the AFR jumps from abut 11.0 to 12.5-12.7. The fuel pump seems fine. Any ideas??? Thanks.
4th Gear
Joined: Nov 2006
Posts: 499
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From: Baton Rouge, LA
What size pulley/pulley combos are you running?
My first thought would be that you're running a faster than 15% pulley setup...the air demanded by the setup is now finally not being limited by your TB, and your injectors are unable to keep up.
My best guess.
- Matt
My first thought would be that you're running a faster than 15% pulley setup...the air demanded by the setup is now finally not being limited by your TB, and your injectors are unable to keep up.
My best guess.
- Matt
Last edited by verveAbsolut; Nov 30, 2007 at 09:33 AM.
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5th Gear
Joined: May 2005
Posts: 836
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From: Los Angeles
15% SC, No crank pulley and JCW 380 injecotrs
6th Gear
Joined: Aug 2005
Posts: 1,335
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From: Tucson, AZ
Are those post-cat AFRs or pre-cat? If it is pre-cat that isn't too bad, but still would be better to run under 12. Hmmmm. Have you tried switching back to the stock TB to see if the problem persists?
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