Fuel injectors/Pressure ? - Page 2 - ZR-1 Net Registry Forums

Ccmano · 09-07-2008

Lee,

I don't think the system was designed to hold pressure for 5 minutes. Assuming the system is dropping pressure, both the in-tank check valve and the fuel pressure regulator valve leaking back can cause that as well as an injector. To eliminate the check valve pinch off the return line at the tank and see if there is a difference.

Low resistance on an injector doesn't mean it is leaking. It's does mean it won't pulse correctly if at all. However I would expect other symptoms like rough idle (if a primary injector) or a high rpm miss (if a secondary).

Other than poor times at the track were there any other symptoms? I think the next course of action would be to take a data scan of the system and see what tells you.

I'm running the Accels from Atlantic Speed and have had no issues. I think you have some more testing to do before you lay out the cash for a set of injectors.

Hans

LGAFF · 09-08-2008

Summit lists 2 injector sets=

Accel
1)150824: 24lb injector

2)150826: 26lb injector

Which set is proper for secondary injectors????? I know Atlanic Sells a set for 150121 that is universal, but is one of the above sets better?

LGAFF
92 ZR1
#234

tccrab · 09-08-2008

Those will probably run too rich. Our systems were designed around 21lb injectors.

TomC
"Crabs"

XfireZ51 · 09-08-2008

Quote:

Originally Posted by tccrab

Those will probably run too rich. Our systems were designed around 21lb injectors.

TomC
"Crabs"

They'll run rich unless you make a change in the calibration.

Even then you may need to tweak the VE tables.

Aurora40 · 09-08-2008

I don't know that Accel rates them at the same pressure as GM does. But I'd think get whatever # rating most people get, as they seem to work with no cal change.

FWIW, mine will hold pressure for 1/2 hour or more. Though yeah the manual doesn't suggest it has to in order to work properly.

You think the injectors are bad vs just one that was defective? I guess it's the same effort to change one as to change 8 though if you think they aren't a good product.

09-07-2008	#11
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,843	Re: Fuel injectors/Pressure ? Lee, I don't think the system was designed to hold pressure for 5 minutes. Assuming the system is dropping pressure, both the in-tank check valve and the fuel pressure regulator valve leaking back can cause that as well as an injector. To eliminate the check valve pinch off the return line at the tank and see if there is a difference. Low resistance on an injector doesn't mean it is leaking. It's does mean it won't pulse correctly if at all. However I would expect other symptoms like rough idle (if a primary injector) or a high rpm miss (if a secondary). Other than poor times at the track were there any other symptoms? I think the next course of action would be to take a data scan of the system and see what tells you. I'm running the Accels from Atlantic Speed and have had no issues. I think you have some more testing to do before you lay out the cash for a set of injectors. Hans

09-08-2008	#12
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: Fuel injectors/Pressure ? Summit lists 2 injector sets= Accel 1)150824: 24lb injector 2)150826: 26lb injector Which set is proper for secondary injectors????? I know Atlanic Sells a set for 150121 that is universal, but is one of the above sets better? LGAFF 92 ZR1 #234

09-08-2008	#13
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,663	Re: Fuel injectors/Pressure ? Those will probably run too rich. Our systems were designed around 21lb injectors. TomC "Crabs"

09-08-2008	#15
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,704	Re: Fuel injectors/Pressure ? I don't know that Accel rates them at the same pressure as GM does. But I'd think get whatever # rating most people get, as they seem to work with no cal change. FWIW, mine will hold pressure for 1/2 hour or more. Though yeah the manual doesn't suggest it has to in order to work properly. You think the injectors are bad vs just one that was defective? I guess it's the same effort to change one as to change 8 though if you think they aren't a good product.