Question on FPR on 86.5
11-22-2012, 01:04 AM
#18
Three Wheelin'
I have every Porken part that Ken makes... My MAF was fine before and still is... You dont HAVE to rebuild or replace it, but the S4 FPR is a must. There are some other things you MAY do like the torque rings (between the gaps / rubber boots on the intake plenums), different plugs with a .040 gap, X Pipe, etc... Ken's website talks about the different items. Good luck with the upgrade... YOU WILL ABSOLUTELY LOVE THE CHIP SET!!!
11-23-2012, 02:51 PM
#19
Racer
Thread Starter
Ok, educate me. If the stock FPR and injectors are 36psi. Why do we want to go to 24 pound injectors?
Just trying to learn. this is my first time with a project of this magnitude. Thanks
Just trying to learn. this is my first time with a project of this magnitude. Thanks
11-23-2012, 03:18 PM
#20
Rennlist Member
You've started your expedition going down the wrong path.
Educate yourself on the 85-86.5 car standard setup.
Realize that three of the most knowledgeable guys are Porken, Mr.Merlin and Mike Frye on this model.
Reverse what you can from other selling sites and start over.
Search for Hilton's thread on injectors.
Educate yourself on the 85-86.5 car standard setup.
Realize that three of the most knowledgeable guys are Porken, Mr.Merlin and Mike Frye on this model.
Reverse what you can from other selling sites and start over.
Search for Hilton's thread on injectors.
11-23-2012, 03:20 PM
#21
Inventor
Rennlist Member
Rennlist Member
Injectors are usually rated for their flow rate at 3 bar (43.5 psi).
24# injectors @ 3 bar, are stock for '85-'86 ('80-'84, too).
They are combined with a 2.5 bar (36 psi) regulator, however.
'87-up use 19# injectors with a 3.8 bar (55 psi) regulator.
Higher pressure with smaller injectors was likely picked for better fuel atomization for lower emissions.
Both stock combinations work well at part throttle (for emissions), but are nearly maxed out at high rpm.
24# injectors @ 3 bar, are stock for '85-'86 ('80-'84, too).
They are combined with a 2.5 bar (36 psi) regulator, however.
'87-up use 19# injectors with a 3.8 bar (55 psi) regulator.
Higher pressure with smaller injectors was likely picked for better fuel atomization for lower emissions.
Both stock combinations work well at part throttle (for emissions), but are nearly maxed out at high rpm.
11-23-2012, 04:31 PM
#22
Racer
Thread Starter
Thanks Ken. Landseer, I realize these guys are very sharp on this stuff. That's why the question was asked.
I hope it didn't come off as questioning anyone's knowledge. I'm trying to make as few mistakes as possible. But I've already made a few and I'm sure I'll make more.
So Ken, I already have the '87 FPR. Should I go with the 24# injectors and the new FPR, or stay with the stock FPR until I decide to do the chip upgrade?
I hope it didn't come off as questioning anyone's knowledge. I'm trying to make as few mistakes as possible. But I've already made a few and I'm sure I'll make more.
So Ken, I already have the '87 FPR. Should I go with the 24# injectors and the new FPR, or stay with the stock FPR until I decide to do the chip upgrade?
11-27-2012, 08:14 PM
#23
Racer
Thread Starter
Ok., returned the 19# injectors today. 24#ers should ship next week. As it looks like it's likely to be next spring by the time I get this up and running, I may end up re-chipping it. Still have a long way to go. I still need to figure out how to do the TB with the engine out of the car. Oh, and the vibration damper is on backwards. Plus need to do front crank seal while I'm at it. And the list goes on. 
Good thing I'm having fun.
Good thing I'm having fun.
