RTEK 1.8, 4 x 750cc injectors, Apexi Neo MAXED - STILL LEAN UNDER WOT
05-03-12, 10:50 PM
#1
RTEK 1.8, 4 x 750cc injectors, Apexi Neo MAXED - STILL LEAN UNDER WOT
So... I'm running an RTEK 1.8, 4 x 750cc injectors and my Neo MAXED, but, still lean over 50% throttle. (By lean I mean 13:1 AFRs at WOT)
It will hold mid-11s AFR up until than...
What you guys think? Time for larger secondary injectors?
Could it be that I'm using a stock s5 turbo?
For engine / exhaust info please see my signature below.
Thanks for your help guys,
-Chris
It will hold mid-11s AFR up until than...
What you guys think? Time for larger secondary injectors?
Could it be that I'm using a stock s5 turbo?
For engine / exhaust info please see my signature below.
Thanks for your help guys,
-Chris
05-04-12, 12:17 AM
#3
FC3S
Join Date: Sep 2006
Location: I come from a land downunder
Posts: 745
Likes: 0
Received 0 Likes
on
0 Posts
If your running the stock turbo there is no way that you could be maxing 4 750cc injectors. It simply can't flow that much air (unless of course its a hi flow)
05-04-12, 01:31 AM
#6
Rotary Enthusiast
iTrader: (2)
Join Date: May 2005
Location: E-L Netherlands
Posts: 1,165
Likes: 0
Received 0 Likes
on
0 Posts
I ran stock turbo, 14psi with 550/750 and did NOT max out the injectors so no way in hell that is the issue.
first thing that comes to mind is loss of fuel pressure, could be caused by:
Bad fuelpump
Clogged fuel filter
Something wrong with the FPR
I had a clogged filter once, as soon as boost got over 8psi it could not flow enough and would run very lean
first thing that comes to mind is loss of fuel pressure, could be caused by:
Bad fuelpump
Clogged fuel filter
Something wrong with the FPR
I had a clogged filter once, as soon as boost got over 8psi it could not flow enough and would run very lean
Trending Topics
05-04-12, 01:49 AM
#8
Rotary Enthusiast
iTrader: (2)
Join Date: May 2005
Location: E-L Netherlands
Posts: 1,165
Likes: 0
Received 0 Likes
on
0 Posts
Pretty much any filter will do, as long as the connections have the same diameter, i believe somewhere around 8mm
I ran stock before this one, and would prefer it.
but i had these issues 1 day before a race so i had to go to a local parts store and had to pick just a random filter with the right connections.
Flows more then enough for my 400hp.
Filter is the cheapest and fastest option to test, and if thats not it, a new filter never hurt anyone! (Some people forget they should be changed every few years!)
I ran stock before this one, and would prefer it.
but i had these issues 1 day before a race so i had to go to a local parts store and had to pick just a random filter with the right connections.
Flows more then enough for my 400hp.
Filter is the cheapest and fastest option to test, and if thats not it, a new filter never hurt anyone! (Some people forget they should be changed every few years!)
05-04-12, 02:28 AM
#11
Rotary Enthusiast
iTrader: (2)
Join Date: May 2005
Location: E-L Netherlands
Posts: 1,165
Likes: 0
Received 0 Likes
on
0 Posts
This is not the right filter..
Flow is enough, but it is stated as "Up to 15psi pressure", so that would mean that this is a filter for carb'ed engines, not fuel injected
Flow is enough, but it is stated as "Up to 15psi pressure", so that would mean that this is a filter for carb'ed engines, not fuel injected
05-04-12, 02:37 AM
#12
Rotary Enthusiast
iTrader: (2)
Join Date: May 2005
Location: E-L Netherlands
Posts: 1,165
Likes: 0
Received 0 Likes
on
0 Posts
Also, if you look at the applications list, it shows that this is for carburettor only
http://m.summitracing.com/parts/sum-g1507/application/
http://m.summitracing.com/parts/sum-g1507/application/
05-04-12, 08:38 AM
#14
Yes.. Fuel injection hose.. The filter is BEFORE my fuel pump and therefor has NO pressure going through it.
I don't see how this could be an issue... Grrr
Guess i could try removing it and istalling stock Turbo2 filter AFTER pump ??
I don't see how this could be an issue... Grrr
Guess i could try removing it and istalling stock Turbo2 filter AFTER pump ??
05-04-12, 10:17 AM
#18
Rotary Enthusiast
iTrader: (2)
Join Date: May 2005
Location: E-L Netherlands
Posts: 1,165
Likes: 0
Received 0 Likes
on
0 Posts
You had me fooled by the fact that you own a FC, as this is the 2nd gen section...
Adding the fact that you own a 1st gen with a totally different fuel setup would have helped in regards to solving the problem..
I think the gravity feed to that pump is insufficient..
You may need an in-tank walbro, with a normal fuel filter to keep up with your fuel demands
Adding the fact that you own a 1st gen with a totally different fuel setup would have helped in regards to solving the problem..
I think the gravity feed to that pump is insufficient..
You may need an in-tank walbro, with a normal fuel filter to keep up with your fuel demands
05-04-12, 10:27 AM
#19
I'm not going to swap gas tanks on a "i think"... The pump is the in-line version and should flow exactly as the in-tank version.
The ONLY advice i've gained here so far is it MAY be my fuel filter and my turbo SHOULDN'T be able to max out 4 x 750cc injectors.... Everyone has read the engine DOES have a large streetport right?
The ONLY advice i've gained here so far is it MAY be my fuel filter and my turbo SHOULDN'T be able to max out 4 x 750cc injectors.... Everyone has read the engine DOES have a large streetport right?
05-04-12, 10:45 AM
#20
^+1 on the fuel filter restriction. Try a fuel flow volume test to see what the system can physically supply. What fuel pressure are you running and how is it regulated?
If that checks out, I'd suspect one of your secondary injectors isn't wired correctly.
As for your setup:
Your injectors flow enough fuel for a stock S5 turbo.
Fuel pump is sufficient.
Streetport doesn't matter. It can't be big enough to affect it this much.
If that checks out, I'd suspect one of your secondary injectors isn't wired correctly.
As for your setup:
Your injectors flow enough fuel for a stock S5 turbo.
Fuel pump is sufficient.
Streetport doesn't matter. It can't be big enough to affect it this much.
05-04-12, 10:54 AM
#21
^+1 on the fuel filter restriction. Try a fuel flow volume test to see what the system can physically supply. What fuel pressure are you running and how is it regulated?
If that checks out, I'd suspect one of your secondary injectors isn't wired correctly.
As for your setup:
Your injectors flow enough fuel for a stock S5 turbo.
Fuel pump is sufficient.
Streetport doesn't matter. It can't be big enough to affect it this much.
If that checks out, I'd suspect one of your secondary injectors isn't wired correctly.
As for your setup:
Your injectors flow enough fuel for a stock S5 turbo.
Fuel pump is sufficient.
Streetport doesn't matter. It can't be big enough to affect it this much.
Ok... I'll try eliminating the canister filter BEFORE the pump and install a stock Turbo2 filter AFTER the pump this afternoon
05-04-12, 05:32 PM
#22
How sure are you that you have 720 injectors?
For got to mention...I'm running rtek 1.8 with 720s,extended street port, stock turbo, and all supporting mods. My car runs RICH!! But on rteks website it states it you don't run 720 with the 1.8 it would lean out and cause engine damage. Which is why I asked if you were sure about your injector size.
For got to mention...I'm running rtek 1.8 with 720s,extended street port, stock turbo, and all supporting mods. My car runs RICH!! But on rteks website it states it you don't run 720 with the 1.8 it would lean out and cause engine damage. Which is why I asked if you were sure about your injector size.
Last edited by 3xBlack Vert-top Mike; 05-04-12 at 05:46 PM.
05-04-12, 05:37 PM
#23
Had them cleaned and cc'ed about a month and a half ago... Lol.. My injectors are awesome.. I watched the test... The RC injectors have a beautiful conical atomization.. Way more atomization than the Injector Dynamics... They just have three large jets of fuel.. Lol
05-04-12, 05:49 PM
#24
Damn...if youre sure you have 720s then I'm not sure what could be wrong. Have you tried calling rtek? You should start were everyone else said...the fuel filter. Lol what pump are you running?
Last edited by 3xBlack Vert-top Mike; 05-04-12 at 05:53 PM.