Notices
Series I Trouble Shooting This is the place to learn more about or discuss any issues you're having with your RX-8

Loss of power at exactly 7.5k RPMS

Old 09-04-2015, 09:47 PM
  #1  
Registered
Thread Starter
iTrader: (1)
 
DVerdeyen's Avatar
 
Join Date: Sep 2013
Location: Indiana
Posts: 200
Received 0 Likes on 0 Posts
Loss of power at exactly 7.5k RPMS

As the title states..
So I had issues with my idle, which I recently finally fixed. Solution? New plugs, wires, BHR Ignition, AEM Intake + new MAF. Finally got the car to stop slowly dipping under 700 rpms which would cause the car to shake pretty hard.

So now that it idles correctly, go figure something else. I took the car on a spirited drive the other day and notice then when WOT the car would climb strong until exactly 7500RPMS hesitate for a second, then continue fairly strong.. maybe not 100% its hard to tell.

I do currently have a slight exhaust leak between my header and catless midpipe which I tried fixing with a new crush gasket but apparently need 2. So I have another in the mail, not sure if this could be a cause.

Current status:
81500 Miles
Passed compression test
P0420 for running catless, only CEL
Stock flash, also cleared VRAM
Cleaned new MAF just incase
Rechecked plug tightness, wires, and BHR ground.

Regardless of gear, I just find it strange it happens at EXACTLY 7.5k. Any input to possible causes or any additional info I could provide?
DVerdeyen is offline  
Old 09-06-2015, 07:52 PM
  #2  
Registered
Thread Starter
iTrader: (1)
 
DVerdeyen's Avatar
 
Join Date: Sep 2013
Location: Indiana
Posts: 200
Received 0 Likes on 0 Posts
No ideas? ��
DVerdeyen is offline  
Old 09-06-2015, 10:17 PM
  #3  
40th anniversary Edition
 
gwilliams6's Avatar
 
Join Date: May 2008
Location: Grapevine, Texas
Posts: 2,777
Received 65 Likes on 58 Posts
Generating Power at Full Throttle
• Ignition Coils
• Spark Plugs
• Spark Plug Wires
• Engine Compression
• E-Shaft Sensor (ESS)
• Air Filter
• Intake Valving
• Throttle Body
• Mass Air Flow Sensor (MAF)
• Fuel Pump
• Fuel Injectors
• Catalytic Converter (Cat)

Keeping the Engine at a Cruise

• Ignition Coils
• Spark Plugs
• Spark Plug Wires
• Engine Compression
• E-Shaft Sensor (ESS)
• Intake Valving
• Throttle Body
• Mass Air Flow Sensor (MAF)
• Fuel Pump
• Fuel Injectors
• Front O2 sensor
• Catalytic Converter (Cat)
gwilliams6 is offline  
Old 09-06-2015, 10:26 PM
  #4  
Registered
iTrader: (4)
 
Join Date: Aug 2014
Location: Dallas TX
Posts: 678
Received 23 Likes on 19 Posts
The VDI opens at 7250. I wonder if yours is malfunctioning, which screws up the air intake velocity?
BigBadChris is offline  
Old 09-11-2015, 09:07 AM
  #5  
Water Foul
 
Steve Dallas's Avatar
 
Join Date: May 2013
Location: Republic of Texas
Posts: 2,324
Received 170 Likes on 138 Posts
Originally Posted by BigBadChris View Post
The VDI opens at 7250. I wonder if yours is malfunctioning, which screws up the air intake velocity?
That's the first thing that came to my mind as well. And, the tach on the dash reads high compared to the OBDII data in my car, so he could actually be losing power at 7250 instead of 7500.
Steve Dallas is offline  
Old 09-13-2015, 10:55 AM
  #6  
Registered
Thread Starter
iTrader: (1)
 
DVerdeyen's Avatar
 
Join Date: Sep 2013
Location: Indiana
Posts: 200
Received 0 Likes on 0 Posts
Besides the little part that we can push to verify it moves smoothly, any other way to test it?? I did have a p0309 code for a while. which went away when I replaced the rear coils. One was toast. Now running the BHR ign.
DVerdeyen is offline  
Old 09-13-2015, 11:19 AM
  #7  
Time for boost...
iTrader: (24)
 
RX8Soldier's Avatar
 
Join Date: Jun 2010
Location: Canada
Posts: 5,413
Likes: 0
Received 13 Likes on 12 Posts
Loss of power at exactly 7.5k RPMS

There is a thread detailing how to remove and test. Unfortunately I can't post it from the mobile site. Copy this below and post it in a Google search:
Site:rx8club.com remove vdi ssv video
RX8Soldier is online now  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Azki23
New Member Forum
12
06-27-2018 03:48 PM
Carbon8
RX-8's For Sale/Wanted
41
04-04-2016 04:05 PM
Cookingislife1226
New Member Forum
4
03-20-2016 09:51 AM
gwailo
New Member Forum
26
03-05-2016 09:51 AM
GARCIAC951
Series I Tech Garage
8
09-10-2015 07:17 PM


Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Loss of power at exactly 7.5k RPMS


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 Amazon.com and affiliated sites.