Driveability improvement
 

Just wanted to say that new injectors make a heck of a lot of difference in the car's throtle response.I swapped in some Ford #24 SVOs last night (to replace my 60K mile Bosch's) and that coupled with the MSD 6A I installed yesterday, it makes my car pull nice and smooth, kind of like an LS1 https://www.thirdgen.org/messgboard/smile.gif

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92 Z28 L98 350
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Ported stock heads, XR270HR-10 cam, TES headers, Crane AFPR, Flowmaster catback, MSD ignition components.
Best ET 13.3@107 mph
"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)
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How much did you have to bump up the Injector Flow Constant in the eprom to get the mixture right? Also, what fuel pressure did you decide to run them at?

Well I'm runing them at 48psi right now and the "ticking" is minimal. Also I had to go to 27 for the injector constant. It's still a little on the rich side (111-120 BLMs) so I might move it to 28 and see what happens.

You are probably aware of this already, but I found that I ignored the BLMs while idling. I went for what the engine sounded the best and ran the smoothest. I ended up somewhere in the 124 INT territory with a 128 BLM min/max. I think you might find 27.5 range (2% leaning) gets you in the area. But don't become a slave to the 128 INT, especially on the idle.

I did find that with higher fuel pressures, the effect is far greater at the higher kpa area of the VE table than on the lower part of the table. This is because at low kpas, the higher vacuum mitigates a lot of the fuel pressure increases, while higher kpa (lower vacuum) gives you the maximum change to the fuel pressure.

You can get a rough idea about the amount of change necessary by noticing the increase with the vacuum hose on and off on the FPR. The increase is minimal with the vacuum hose on and maximu with the hose off. Basically, you end up "flattening" the VE tables.

It is kind of nice with eprom burning to decide what fuel pressure YOU WANT and tailor the VE tables to match.

[This message has been edited by Glenn91L98GTA (edited January 20, 2001).]

I called tpis for a chip and they b#?hed me out about the ford injectors. They said they have the worst spray pattern of any injector. Sorry! I didn't notice. They work great and are cheap to boot. I run 51psi with their chip. Seems high but it runs best there.

Of course TPIS balled you out...you saved money not buying their stuff. Frankly, inspite of TPIS' fantastic claims (and let's assume that they ARE THE BEST INJECTORS), I doubt that you'd be talking more than a few HP on a basically stock motor and probably 10 HP on a serious motor.

I think there are other ways to spend the money you save on SVO injectors to get those few missing ponies (if any).