Rebuild of Indy Fiero #163 Super Duty 4 (Page 26/28)
fierosound AUG 03, 09:16 AM
I test drove the Indy today.

Even with the rough tune - it's never run this good!
fierosound AUG 06, 11:22 AM
I am making progress.

I got most of the base parameters in my BIN in pretty good shape.
Got my fuel grams/second figured out. Idles great at 13.5 - 14.0 AFR.
RPM was be too high when engine started hot or cold - fixed that.
Took a long time for RPM to come down to idle from hot or cold start - fixed that.
Engine took too long for RPM to come down to idle from blipping throttle - fixed decay rate.
Other minor changes in base parameters at this point only. Haven't touched any fuel/spark tables yet.

So now the SD4 starts good, idles quite well for 'lumpy' engine and is quite driveable.
I will be driving with TunerPro RT and recording Datalogs to to see what it needs in more detail.

Solved a minor problem I was having with ECM throwing a Code 24 for VSS (Vehicle Speed Sensor).
CEL (Check Engine Light) would come on at about 4800 rpm when accelerating and engine would buck.

Here is what playing back TunerPro DataLog showed ECM was seeing.
I'm accelerating "floored" (See TPS, MAP, and RPM) in 2nd gear +60kph when ECM suddenly thinks I'm at 0 and cuts fuel.

[This message has been edited by fierosound (edited 12-06-2019).]

fierosound AUG 19, 08:48 AM
Just an update...

I finally FOUND the source of the problem causing all the headaches.
An intermittent short of the battery cable near the starter on a heat shield.

On the '84, all the supply wires with fusible links connect there too.
So anytime the short touched, the ECM etc. all lost power for a milli-second.

New cable fixed everything. And it is now well protected.

This engine has NEVER run so well before...
Much, much better than the carburetor or Fast TBI on there before.

[This message has been edited by fierosound (edited 12-06-2019).]

Lilchief SEP 18, 09:46 PM
Glad to here it's running better. Does it seem to have more power ? How about mpg. A sound video would be cool. Any tips on your intake mods for the injectors, like hole sizes and depth if stepped. and angles. Keep up the great craftsmanship, and ingenuity.

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

Blackwater FEB 14, 11:08 AM
I'm brand new here!! First let me say that this is a BEAUTIFUL project!! Very well executed!!

I have a couple of questions. I'm doing research for a project of my own and have already gleaned some great information from this thread. I've read it from beginning to end and it's a great thread!! I'm building an older 153" Chevy II engine and I'm searching for a roller camshaft for my project. I know that the cam bearings and timing gear are the same for both engines and that the crankshafts can be interchanged with a little work. I also know that the very early "Iron Dukes" used the same camshaft and lifters as the 153s.

Here is the first question: Were the lifter bores on the later crossflow Iron Duke and SD blocks different from the earlier castings? Did they change the lifter bore angle or placement?

The second question is for the original poster. Again!! I'm impressed with the level of fit and finish of your project and with your determination to get this working. This is NOT criticism!! I'm just curious!! Have you considered having a little extra material added to the narrow spots on your header flange?? I had to do this to the header on my 153, but it CURED the exhaust leak and gasket damage problems.

Like I said. I'm new here!! I hope I can pick up some much needed information and education here. I'm an experienced mechanic and fabricator, (retired) with fifty years worth of knowledge and training. I owned one of the first Fieros in Nashville, TN, a 4spd LE model. The GTs and such came out later. Maybe I'll build another one someday.

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Never use a minor caliber bullet on a major caliber opponent!!

[This message has been edited by Blackwater (edited 02-14-2018).]

Lilchief FEB 23, 03:29 PM
Tony, sent you an email.
fierosound FEB 24, 03:03 PM
Blackwater -->> Thank you and welcome to PFF
Lilchief -->> email replied to

Chev 153" engine is a similar but different animal.
https://en.wikipedia.org/wi...53_4-cylinder_engine

I do not have any answers to the questions you posed.
But the SD4 Engine Guide has engine blueprints in it.
http://www.fieronews.net/fu...id=21&download_id=87

I used the cam that was in the SD4 engine and
had it reground by Colt Cams here in Canada.
http://www.coltcams.com/

Header seems to be OK right now, so I don't need to take it off.

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My World of Wheels Winners (Click on links below)

3.4L Supercharged 87 GT and Super Duty 4 Indy #163

[This message has been edited by fierosound (edited 02-24-2018).]

Blackwater FEB 26, 07:48 PM
I appreciate the response! I've gained a little more info since that last post! The valve train layout is different between the later crossflow head and the older unit. The valves in the newer head are I E I E E I E I. The older head is E I I E E I I E. The later head COULD be adapted fairly easily, BUT I already have an older head ported, polished, new valves installed with new keepers, springs, retainers, larger stainless valves, guide plates, and professionally assembled.

I talked to Geoff at Colt Cams. If I can find a blank, he'll grind a cam for me!!

Thanks again for all the information you've put together!!
fierosound MAR 25, 05:30 PM

quote
Originally posted by Blackwater:

Thanks again for all the information you've put together!!





Start your own thread about the 153ci engine and move this stuff there so we don't clutter this thread.

[This message has been edited by fierosound (edited 03-25-2018).]

fierosound MAY 15, 05:43 PM
Thank goodness for Pick n Pull!

The last tuning I was doing with TunerPro showed that I needed MORE AIR above 5000rpm.



So I got the Dodge 5.2/5.9 V8 throttle body (OEM by Holley) with it's bigger 2" bores on the right.
It's identical to the V6 TB otherwise, so the only other thing I needed to do was bore the adapter plate to match.



While I was in there, I decided to make the throttle wheel look better too.








I test drove it the other day.
I think this is the perfect combination.
Now it's a matter of fine tuning with TunerPro RT.

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