Are you referring to the possibility of a slipping belt?

 

DR, a couple questions regarding the “fuzzy pic” AFPR on post 438.

1. What is the part number for it on you web site (can’t find it)?
2. What is the difference between that one and a very old Bosch High Performance AFPR (Bosch 0.280.160.215) that I currently have installed on the car that I am going to boost?

 

>DR, a couple questions regarding the “fuzzy pic” AFPR on post 438.

>1. What is the part number for it on you web site (can’t find it)?

Here is the direct link for your 86.5 (as noted earlier, the photo is still of the old style)

https://www.928gt.com/ps-400-31-adju...tor-80-87.aspx

>2. What is the difference between that one and a very old Bosch High Performance AFPR (Bosch 0.280.160.215) that I currently have installed on the car that I am going to boost?

The old version is a stock Bosch regulator that is cut and modified to be adjustable. Tony has reported it didn't seem to work as well on boost as he would like (Tony, did I get that right?) . I have never tested the old version with a boosted application so I have no direct experience.

The new (current) version is made from the ground up to be an adjustable regulator and is a very nice billet aluminum part and seems to work great on boosted and non-boosted applications.

BTW, the only difference between the early and late version (80-87 & 88-up) is the early version has a "barbed" fitting for the "return port"(the one on the bottom) since that year range uses a hose w/clamp connetion and the late version has a threaded fitting only that fits the factory threaded fitting hose.

 

Just look under Part Type>Engine>Injection. The picture is wrong (as Dave mentioned), but they're 3 down.

Oops, Dave beat me to it.

 

Mike, my existing pulley is 2 3/8". I don't see a lot of room to go smaller and still fit on the shaft. How small do they go? How much smaller would the diameter have to be to increase the boost another pound or two?

 

Matt, just to clarify. On a SC with 8lbs boost and #30 injectors. Using the 85-86 fpr I understand that it produces 30lbs with vacuum and about 36lbs with no vacuum but will produce 44 lbs when 8lbs boost is applied?

In Tony’s earlier post he suggests that with this setup I would need 64lbs pressure to achieve the proper A/F ratio.

 

Hey pass that over here too...

I took a little time to catch up on this thread.... it really has legs....

Hi Mike thanks for your PM about electric fans.. i will let you know how it goes....

DR...

I Really like your AFPR... looks sweet... but that throttle body is sick... it make me want you kit even more... looking forward to see some of the installs... January or February will be the timeframe?

Your dyno chart shows a very flat AF ratio... how quickly does the fuel pressure react to manifold pressure. Seems very promising... On my 86.0 stock ECU... is the lack of a flappy valve an advantage... it is a little more simple right?

Merry Christams / Happy Holidays...

LO

 

Lo,

>I took a little time to catch up on this thread.... it really has legs....

I bet that did take a while!


>DR...
>I Really like your AFPR... looks sweet... but that throttle body is sick... it make me want you kit even >more... looking forward to see some of the installs...

ME TOO!! :-)

> January or February will be the timeframe?

Correct.

>Your dyno chart shows a very flat AF ratio... how quickly does the fuel pressure react to manifold >pressure. Seems very promising...

Seems to react pretty quick, of course you always want it to react quicker and I have some simple tricks up my sleeve if that is necessary.

>On my 86.0 stock ECU... is the lack of a flappy valve an advantage... it is a little more simple right?

Correct, for one thing you will not have that dip around 4000rpms.

>Merry Christams / Happy Holidays...

Same to you and everyone else. I am getting ready to leave to be with family for Chrstmas.. :-)

 

That is getting pretty small.... If you were to get a smaller pulley, you might have to make some modifications to the pulley or the adapter.

I think at some point in time, Andy offered a smaller intercooler and a larger intercooler. I think he dropped the smaller intercooler after a while and only offered 1 size. Do you recall if you have the larger intercooler?

Also, what octane do you use?

 

Also, for anyone curious about the "30#" injectors, I believe the bosch number is "0-280-150-945". Just poking around online, that appears to be a 30# injector by bosch standards.

 

Hi Mike,
I think the ones Daryl has are Ford Motorsport M-9593-B302 which are rated 30# at 43.5psi. As far as I know these are the ones Andy recommended for his kit.

Best wishes for Chrostmas to everyone !

 

Yup. I just checked a set of summit racing FMS red-top 30# injectors (same part number you mentioned) and the bosch number is what I posted - just in case anyone was curious.

 

Bill,
How is your car doing with the bypass valve modification? I was just experimenting with a car and I noticed that while sitting idle... the manifold sees atmospheric pressure BEFORE the pre-SC inlet. You re-routed your vac-line to the valve actuator from the manifold to a spot on the throttle-body - right?

If I get a chance, i'm going to run a vac line into the cabin and have 2 boost gauges to monitor what both (pre-SC and post-SC) vac locations are doing.

 

Mike:

I drove the car to work all week after the change to a throttle body vacuum source for the bypass valve. The car seems fine, flies as fast as ever when I get on it, and, as I reported, the idle is coincidentally much smoother.

I noticed the valve closes long before atmospheric. It closes with just soft, partial throttle. Hence I don't know that the difference you are seeing between the manifold and throttle body vacuum would affect it.

Also, the 25" Hg vacuum I reported earlier must have been something I saw when decelerating to a stop. All I have seen since is 18-20 sitting at idle, and 25 only when decelerating and using engine braking.

 

Yes, that is what you should see. Do you have a remote fuel pressure gauge or some sort of data logging?

I don't know what pressure you'll need. I wonder if that 64psi is at 100% or a lower duty cycle.