Go Back  HomemadeTurbo - DIY Turbo Forum > Homemadeturbo > Engine Management
Anyone else have problems with Percision 780 injectors? >

Anyone else have problems with Percision 780 injectors?

Engine Management eCtune , Crome , AFC , FMU , Zdyne , Hondata , EMS , TE , Uberdata Anything to control your fuel, spark needs!

Anyone else have problems with Percision 780 injectors?

Old 11-19-2005, 11:21 AM
  #1  
1.0 BAR
Thread Starter
 
Join Date: Jul 2004
Posts: 296
Default Anyone else have problems with Percision 780 injectors?

I had my car tuned the other day and when he put the basemap for 780 injectors the car was ungodly lean. so then we put a 450 basemap on and it ran fine. The injectors are brand new Percision 780's and i verafied with Percision that they are the correct ones with the partnumber stamped on them. I am runnign these on a boosted h22a in a 90 accord so there is a resistor box. I am running Crome but the same thing happens with Uberdata. Even though they are brand new they wont refund my money so im stuck with them. Anyone have any ideas?
MyVtec8yourV8 is offline  
Old 11-19-2005, 11:28 AM
  #2  
3.0 BAR
 
Join Date: Jan 2004
Posts: 5,934
Default Re: Anyone else have problems with Percision 780 injectors?

exchange them
Ravage70 is offline  
Old 11-19-2005, 01:17 PM
  #3  
0.0 BAR
 
Join Date: Mar 2004
Posts: 0
Default Re: Anyone else have problems with Percision 780 injectors?

sounds like they are 450's to me.
SpankedYA! is offline  
Old 11-19-2005, 01:31 PM
  #4  
1.5 BAR
 
Join Date: Mar 2004
Posts: 938
Default Re: Anyone else have problems with Percision 780 injectors?

does it run lean in boost, what is your fuel pressure set at.
98ctr is offline  
Old 11-19-2005, 08:24 PM
  #5  
1.0 BAR
 
Join Date: Apr 2003
Posts: 467
Default Re: Anyone else have problems with Percision 780 injectors?

Like he said whats your fuel pressure? If its too low then it will run lean on a standard basemap made for that size injector. Its called a basemap for a reason. With big injectors like that a basemap is never anywhere close to having the right amount of fuel. Get it tuned.
sohc_mshue is offline  
Old 11-20-2005, 12:45 AM
  #6  
3.0 BAR
 
Join Date: Jan 2004
Posts: 5,934
Default Re: Anyone else have problems with Percision 780 injectors?

Originally Posted by CSaddict
sounds like they are 450's to me.
hahaha i bet your right
Ravage70 is offline  
Old 11-20-2005, 07:47 PM
  #7  
1.0 BAR
Thread Starter
 
Join Date: Jul 2004
Posts: 296
Default Re: Anyone else have problems with Percision 780 injectors?

Originally Posted by sohc_mshue
Like he said whats your fuel pressure? If its too low then it will run lean on a standard basemap made for that size injector. Its called a basemap for a reason. With big injectors like that a basemap is never anywhere close to having the right amount of fuel. Get it tuned.
I called Percision and
A. they wont exchange them.
B. they ARE 780's ( i read them the part numbers to verafy)
C. i was having it tuned and the tuner said he has had problems with Percision 780's before and he just put RC 750's in and it totaly cured the problem.
D. it is a stock fuel pump of a 90 accord(i know its to small BUT 1 problem at a time.) See what happened is with the 780 base map the idle fuel value was at a genaric starting point of lets say 17 but at idle it was SO lean that he had to put the values to 230 or more.but once the values were at the 230ish it idled fine. if it there was not enough fuel pressure it wouldnt richen up by raising the values. and with a 450 fuel map the values set at the genaric 17 idled it fine.. Im lost and dont know what to do.
MyVtec8yourV8 is offline  
Old 11-20-2005, 11:01 PM
  #8  
1.5 BAR
 
Join Date: Dec 2002
Posts: 1,008
Default Re: Anyone else have problems with Percision 780 injectors?

larger inj have more mass to them and require more pulse at idle than you'd think. every large inj car i've tuned needed more than i thought to idle well. just tune it...heep adding fuel at idle, and then continue to tune as normal.
scttydb411 is offline  
Old 11-21-2005, 07:18 AM
  #9  
3.0 BAR
 
Join Date: Apr 2003
Posts: 11,059
Default Re: Anyone else have problems with Percision 780 injectors?

i know the guy that 'attempted' to tune this car, he is more than competant enough and has tuned a few 1000cc injectors cars that i know of with no problems. the problem doesn't lay in the tune or tuner, but i'm pretty sure it's the injector's. i've had problems with other injectors as well (delphi, siemens/deka, venom, etc.). the only injectors i have never had a problem with and set of, are rc's and dsm's. get some new injectors jeff, quit trying to polish a turd
projekteg is offline  
Old 11-21-2005, 05:40 PM
  #10  
1.0 BAR
Thread Starter
 
Join Date: Jul 2004
Posts: 296
Default Re: Anyone else have problems with Percision 780 injectors?

Originally Posted by projekteg
i know the guy that 'attempted' to tune this car, he is more than competant enough and has tuned a few 1000cc injectors cars that i know of with no problems. the problem doesn't lay in the tune or tuner, but i'm pretty sure it's the injector's. i've had problems with other injectors as well (delphi, siemens/deka, venom, etc.). the only injectors i have never had a problem with and set of, are rc's and dsm's. get some new injectors jeff, quit trying to polish a turd
Kevin im not polishing a turd here. im trying to see if any one else has had the same problem and knows how to different;y wire the injectors to the resistor box or some crazy ----. See the thing is im stuck with a god damn $350 set of injectors and people are just saying get another set of $350 injectors to fix the problem. i dont have the cash to waste. im trying to find out if there is some thing i can do other than buy new ones.. sell them people say.. who will buy a set of injectors that dont work in my car but they MIGHT work in your car?
MyVtec8yourV8 is offline  

Thread Tools
Search this Thread
Quick Reply: Anyone else have problems with Percision 780 injectors?


Contact Us - Sitemap - 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.