I've been looking at a HSR in the for sale section. My car was a 305 tbi. I removed the ecm and installed a carb for quickest and easiest. I'm thinking of going back to efi. What are some suggestions from some who have done this. I don't have a bunch of money to spend. I've looked at the HSR with the commander 950 but that would push $2500 dollars or $3000 by the time I get every thing lined out. I would like the driveability of efi and the better mpg. Just lookin for some direction.


my mods:
ZZ4 short block
Bullet Racing cam duration at .05, intake 225, exhaust 233, Lobe separation 110, gross lift intake .541, exhaust .526.
Edelbrock air gap rpm vortec intake.
Vortec heads.
Hooker super comp LT headers.
Holley avenger 770

 

How much work you want to put into it is gonna be the deciding factor. Your cheapest route that your gonna build good power on is gonna be: HSR + Rails with used speed density harness, SD ecu, 30" injectors, TPI distributor, 52mm throttle body, ostrich programmer + software.
You could probably cut corners a bit here but I wouldn't.
This should cost around $1600-$1700 is my guess.

Or just go the other route and get your brand spanking new HSR. I have never programmed the commander 950 system but im willing to bet its more user friendly than having to learn the stock tpi ecu.

All that is assuming you have a efi fuel pump still.

 

If the TBI harness is still there just repin it to a '730 spec. It took me under 2 hours to do mine when I had a '91 firechicken.

I'd try the new edelbrock intake over the HSR. Probably a better performer.

The cam might be a pain to get dialed in. How much vac do you have at idle? around 10hg?

-- Joe

 

ECU and harness were stripped out. I guess I could get a tpi harness and reinstall. Looks like I need to take my time and collect my parts as I go. What are the advantages/disadvantages to the HSR versus the single plain vortec intake. I'm not sure of my vac

 

You prob know this the Holley SR has to be Vortec specific.

The single plane needs a neck(see Edelbrock new part) or a TB on top with cold air ducting. I thnk the Holley SR will mate with stock air cleaner ducting and appears more like stock.

 

I was just interested in the performance differences of both intakes. Would there be a reason not to use the single plane versus the SR?

 

Single plane can support more HP(higher RPMS) but at a sacrifce of TQ.

Holley SR supports serious HP as well and may have more TQ lower in RPM band.

Holley SR appears more stock.

Holley I believe requires a small cap dist.

Holley will cost less $$$ as you may need a neck to allow use of TBI TB.

I prefer the look of traditional manifold but that is just me!