Rebuild of Indy Fiero #163 Super Duty 4 (Page 24/29)
mender JAN 06, 10:33 AM
Interesting read and nice car, sorry to see how much trouble you've had with the engine and fueling. I have a race shop about an hour north of you and I road race an '87 GT. I worked at Guyon Racing in Calgary when we built Art McKenzie's rally Fiero with the SD4 engines back in the late '80s and early '90s and still have an SD mechanical fuel injection system set up for alcohol. I do a fair bit of EFI work including tuning and am surprised that you've had trouble finding good tuners in Calgary. I built a 2.0 engine for a sports racer with a race cam that idles at 1000 rpm and makes 200 hp at 7500 rpm that runs the SDS system (local company), very easy to tune and designed for engines like yours that are closer to race than street. I've tuned FAST and AEM Infinity systems for race-cammed engines, wasn't all that pleased with their tech support and ended up doing things my way to make their systems work, and although very capable both systems are quite a bit more complex and harder to tune than the SDS. I usually end up doing the driveability tuning after the engine/car gets off the dyno, seems most tuners just want to do the WOT stuff.

Looks like you're on the right track with the MPFI but the 48 lb injectors are a little big if you're going with that size unless you're planning to boost it, which isn't likely with the 10.5:1 compression ratio. WIth the previous 160 hp reading at the wheels with the auto you're probably in the 220 hp range at the crank, so I'd suggest around the 32 lb range, still enough to supply 260 hp but easier to meter at low rpm and loads. I also do show quality custom headers so if you're still having sealing issues and would like a header with a better flange, cleaner welding and proper sized secondary tubing, let me know and we'll talk Fiero.

[This message has been edited by mender (edited 01-06-2017).]

fierosound JAN 21, 05:29 PM

quote
Originally posted by mender:

Looks like you're on the right track with the MPFI but the 48 lb injectors are a little big if you're going with that size unless you're planning to boost it, which isn't likely with the 10.5:1 compression ratio. WIth the previous 160 hp reading at the wheels with the auto you're probably in the 220 hp range at the crank, so I'd suggest around the 32 lb range, still enough to supply 260 hp but easier to meter at low rpm and loads. I also do show quality custom headers so if you're still having sealing issues and would like a header with a better flange, cleaner welding and proper sized secondary tubing, let me know and we'll talk Fiero.




Thanks. I talked a bit with you about your car at last spring's Didsbury show.

If you don't have a V8 Mustang, Camaro, Corvette or a Ricer - there's no tuners here.
I certainly don't know anyone local using TunerPro RT which is the only way to program the setup I have.
The 48# rating is at 58psi. I'll be running 42psi.

I have to get this installed and see where I stand.

[This message has been edited by fierosound (edited 01-21-2017).]

Stubby79 JAN 23, 11:37 AM
nice work on that intake!
mender JAN 25, 10:23 AM

quote
Originally posted by fierosound:


Thanks. I talked a bit with you about your car at last spring's Didsbury show.

If you don't have a V8 Mustang, Camaro, Corvette or a Ricer - there's no tuners here.
I certainly don't know anyone local using TunerPro RT which is the only way to program the setup I have.
The 48# rating is at 58psi. I'll be running 42psi.

I have to get this installed and see where I stand.



That still puts the rating at about 41 lbs, enough to support over 300 hp. Not the end of the world but everything's easier when the numbers are closer.

Have you checked with Toma at Dynomotive?
Lilchief JUN 16, 05:22 PM
Tony. Any luck with the new intake ?

------------------

85 GT 3.4
14.9 @ 90 1.9 60' Old TH125/3.06
Unknown New 4T60/3.42

Lilchief JUN 16, 08:08 PM
mender, sent you a p m

------------------

85 GT 3.4
14.9 @ 90 1.9 60' Old TH125/3.06
Unknown New 4T60/3.42

fierosound JUL 10, 06:29 PM

quote
Originally posted by Lilchief:

Tony. Any luck with the new intake ?




Not on the car yet - but I've been working on it.

Have to get ends of fuel rail bored/tapped for ORB (O-Ring Boss) fuel fittings.
Then bead blast and powder coat intake, adapter/spacer, alt/dogbone mount and throttle bracket.

The Edelbrock manifold was intended for mechanical fuel injection nozzles of that time.
This arrangement could not possibly fit without the new compact Bosch EV14 EFI injectors available today.



[This message has been edited by fierosound (edited 09-02-2023).]

fierosound JUL 11, 12:14 PM

quote
Originally posted by mender:

... I worked at Guyon Racing in Calgary when we built Art McKenzie's rally Fiero with the SD4 engines back in the late '80s and early '90s and still have an SD mechanical fuel injection system set up for alcohol.




mender: you have a PM...

A video clip of Art McKenzie's SD4 car...

[This message has been edited by fierosound (edited 07-11-2017).]

fierosound JUL 26, 09:09 AM
Finally started installation of the Multi-port EFI system I put together.
I have to modify my wiring harness and install new connectors while on the engine.



Here's the 2-bbl and 4-bbl manifolds together to show how huge the open plenum is on the 4-bbl intake.



Just a quick test fit to see how it looks in the engine bay. :-)

[This message has been edited by fierosound (edited 11-12-2019).]

KurtAKX JUL 27, 10:25 PM
curious to see how you make that last bend with the throttle cable- re-using the bellcrank from previous iteration?