fuel pumps
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
Datalog to tell what the car is doing under WOT. Depending on boost level, you may need to be at 11.8-12.2 AFR. Additionally, the car can be running lean without showing a drop in FP.
Data removes all guessing.
Data removes all guessing.
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
Very true but it isn't fixed by buying a new weldon fuel pump or ZR-1 twin pump and dual lines as was suggested earlier. It is fixed by tuning the PE vs RPM fuel tables in the computer to get the car at the proper fuel ratio. Only a wideband will tell real story.
Last edited by 93VettePilot; May 7, 2011 at 12:55 PM.
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
My fuel gauge is inop and this was on my list of things to replace as I was told the sending unit was bad. So, I figured do it right while it's apart. You state the ZR-1 has a 2 pump assembly. Will that fit my stock 1988 coupe? How much more volume than stock are we talking about? (I'm considering a 383 build soon and wouldn't want to re-replace it). As far as the sending unit, will said ZR-1 pump assembly work with a replacement stock sending unit? (I know nothing about the electric stuff etc).
Also, I have a hesitation in the current motor when not in WOT. (not a miss just a kind of not putting out the right amount of push, but almost a miss). I have eliminated about all of the fuel and most of the electric possibilities and was thinking maybe I got an injector going bad. I Was wondering what kind of injectors could be used to replace the stock ones with? I was wanting to upgrade and have more fuel on demand. what would be the highest poundage injector to go with (without overkill) if I was going to be doing the 383 thing soon (500ish hp and porting)? I know I will need more fuel availability. Again, I was not wanting to re-replace them later but I am wanting to fix the hesitation and upgrade to more fuel availability and reliability without changing to a carburetor or something.
Thanks in advance Obi Wan
Perry
Also, I have a hesitation in the current motor when not in WOT. (not a miss just a kind of not putting out the right amount of push, but almost a miss). I have eliminated about all of the fuel and most of the electric possibilities and was thinking maybe I got an injector going bad. I Was wondering what kind of injectors could be used to replace the stock ones with? I was wanting to upgrade and have more fuel on demand. what would be the highest poundage injector to go with (without overkill) if I was going to be doing the 383 thing soon (500ish hp and porting)? I know I will need more fuel availability. Again, I was not wanting to re-replace them later but I am wanting to fix the hesitation and upgrade to more fuel availability and reliability without changing to a carburetor or something.
Thanks in advance Obi Wan
Perry
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
My 357 w/52mm and intake work burns nice
on 26lb/hr B-IIIs @ 50psi.I guess 32 would fit a 383 as long as there was some more CFM made available, knowing there is some latitude on the pressure so it can be dialed down a bit if needed.. I wish I'd gone a bit bigger and just run less pressure...oh well.
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
32lb ? I'd have a 52mm T-body & adjustable regulator to go with those...
My 357 w/52mm and intake work burns nice on 26lb/hr B-IIIs @ 50psi.
I guess 32 would fit a 383 as long as there was some more CFM made available, knowing there is some latitude on the pressure so it can be dialed down a bit if needed.. I wish I'd gone a bit bigger and just run less pressure...oh well.
My 357 w/52mm and intake work burns nice
on 26lb/hr B-IIIs @ 50psi.I guess 32 would fit a 383 as long as there was some more CFM made available, knowing there is some latitude on the pressure so it can be dialed down a bit if needed.. I wish I'd gone a bit bigger and just run less pressure...oh well.
