Single Turbo Discussion Area for discussing single turbo RX-7's.

Power Lost Due To Retarded Timing?

Old 04-03-2005, 04:27 PM
Junior Member
Thread Starter
Join Date: Dec 2003
Posts: 14

To make a long story short, I wasn't aware until last week that the front hub and pulley are a matched set from the factory. As it turns out, my timing has been about 10* too retarded for the last year or two. I was having all kinds of problems - torque down low didn't seem right, spool took forever (15psi at near 5000 rpm with a .96 undivided p-trim 60-1), and power wasn't where it should have been either (estimated @ 330rwhp at 15psi boost, stock ports). To top it off, around town mileage never got above about 13mpg, and on the freeway i could only manage ~18.5mpg with careful tuning. At the time I thought the leading plugs were firing 13*btdc with a 15* split at full boost (15psi). As it turns out, they were at 3*btdc and 12*ATDC!

So my question is... how much of an effect would the timing have on these things? Is there a significant difference in power between firing at TDC and 10*BTDC?



PS - I zeroed my timing this time around by marking the pulley with an apex seal at the rear trailing plug hole, and then marking it with the seal at the rear leading plug hole. TDC is centered between the two marks.

manolis is offline  
Old 04-03-2005, 04:53 PM
Senior Member
Join Date: May 2002
Location: California
Posts: 22,466

i did that with my 20b, hp went from 220ish to 140ish. yes i have a 20b dyno sheet @12psi and 140rwhp
j9fd3s is offline  
Old 04-04-2005, 12:51 AM
Senior Member
Join Date: Jul 2001
Location: Tulsa, OK
Posts: 3,346

Having your timing too far retarded, and 10 is a lot, would cause the poor gas mileage, very poor throttle responce, horrible power, and also cause your water to run hot.
94touring is offline  
Related Topics
Thread Starter
Last Post
Insert BS here
12-16-2004 11:19 PM
Insert BS here
12-16-2004 10:51 PM
Insert BS here
07-12-2003 01:51 PM
Suspension, Wheels, Brakes, Tires
03-28-2003 05:58 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Search this Thread
Quick Reply: Power Lost Due To Retarded Timing?

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.