Holley Sniper

David C · #1 (**permalink**) 26-09-23, 04:34 PM

I think I'm in danger of over thinking it here. The important thing is that you have a much improved system that is working well for a reasonable outlay.

With any luck a few more of us will get EFI fitted and be able to report back and fine tune what is required for those who follow.

Thanks again for sharing !

Green411 · #2 (**permalink**) 26-09-23, 07:22 PM

Well over thinking is better than no thinking, which is the hole I sometimes fall into!

Green411 · #3 (**permalink**) 27-09-23, 04:37 PM

I just had a look at some forums, including Holley's 'Sniper efi' forum. The administrator and senior members (ie the ones who know the most I reckon) generally seem to think that a dual plane intake is fine with a Sniper. My own experience supports that.
I'm no expert, and I'm a VERY long way from knowing a zillionth of what a professional mechanic/engineer knows, but I firmly belive that a successful Sniper installation needs to be in a car with properly matched engine parts on an engine in reasonably good fettle with a good battery and charging system. It won't fix basic errors in matching cam and heads, for instance. Then just follow Holley's comprehensive instructions, particularly about electrical connections, and you should be ok.

Green411 · #4 (**permalink**) 07-10-23, 10:15 AM

Howdy y'all. Hope this update is of interest.
On a recent 140 mile round trip on single-carriageway A & B roads, 18-20*c, not exceeding 65 mph, mostly at 50-60mph, but several roundabouts and junctions to accelerate away from (gently, letting the torque do the work), driving on the gently side of normally (with no hyper-miling tricks) and measuring from a hot start I got 19 mpg. From a 383! Driveability absolutely perfect.

David C · #5 (**permalink**) 07-10-23, 10:18 AM

Brilliant! Thank you for the update.

Thor · #6 (**permalink**) 09-10-23, 07:47 AM

That does seem like a good MPG figure. Thank you for this information. I'm hoping to get a Sniper onto my 409, and also a gearbox with lock-up torque converter. With the smaller engine I would hope to be into the 20s on MPG.

Green411 · #7 (**permalink**) 10-10-23, 04:34 PM

At first it did seem too good to be true, but I double-checked my sums and actually erred on the side of caution!
Thor, I'm sure that with a smaller engine, o/d transmission and a lock-up tc you'll beat me easily - assuming your engine is in stock/mild state of tune. On a 40 mile drive at 60-70mph, hot start, I once got 31mpg from my o/d auto '95 Corvette, which had a diff ratio of c.3.00:1 and did 2200rpm at 80mph.