MODIFIED HOLLEY ULTRA H/XP "850" 1.58" V 4150 CARB
Apr 3, 2013 It is also more tuneable than an "out of the box" Holley H/XP "850" due to the the addition of replaceable TSRs & lowered IFRs. It will come w/ a detailed build sheet that covers all the components and as-delivered baseline tune settings, so you'll know EXACTLY what you have. From speed-talk.com
FINAL HOLLEY 950HP CARB (80496-1) TUNING SPECS FOR A...
Apr 13, 2023 I've spent the last 6-8 weeks tuning the Holley 950HP (80496-1) on my 502BBC build (details in signature below). Thought I'd share the results to possibly help guide the next pilgrim's plight. From chevelles.com
950 ULTRA XP TUNING ON 500" - FOR A BODIES ONLY MOPAR FORUM
Oct 10, 2019 My advice on how to tune that carburetor on a 500 is, throw the 950 on the shelf and put a 1050 Dominator on it. The 950 only flows 830 CFM. That ain't near 'nuff. From forabodiesonly.com
OUT OF BOX HOLLEY 950 HP ULTRA TUNE? - DON TERRILL’S SPEED-TALK
Oct 26, 2011 I'm considering swapping the metering blocks from my 950 HP to the TMP 1.70 venturi carb and start with the Ultra's tune. Even though the TMP has larger venturi, it does have the more restrictive annular boosters. From speed-talk.com
does anyone have any experiences with the new XP carbs in 850 or 950 CFM on a modded LS motor? I can give you some real world advice that I have learned over the years. A smaller carburetor will give you better throttle response and more torque at a lower RPM. With the smaller carb your car will be more enjoyable to drive and feel faster. From pro-touring.com
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TUNING THE HOLLEY 950 ULTRA XP - RACINGFUELSYSTEMS - TAPATALK
Jun 12, 2020 FWIW, I believe the general opinion is the out-of-the-box tune of the 80805 leaves a lot of room for improvement: - too much emulsion - poor booster signal - intended for a fairly narrow WOT RPM range From tapatalk.com
HOLLEY ULTRA XP 950 ALKY CARB | YELLOW BULLET FORUMS
Dec 6, 2016 Since Holley is having their "Holley Days" sale, I've been considering buying one of their 950 Ultra carbs for a 406 ci bracket car. Anyone have any feedback on them? Venturi size is a little on the large size (1.60") compared to a QF 950, but they both have 1.75" throttle bores. From yellowbullet.com
Aug 8, 2010 They really settle down a 460 SR at cruise. The Hg of the Power Valve and Distributer Vacuum Pod should be approx 1.5 to 2 points below your Manifold Vacuum at Idle. I still find that 15 Hg Manifold Vacuum incredible. If the Distributors Vacuum Pod is rated to High for the Idle Manifold Vacuum the Timing will Haunt at Idle and Cruise. From camaros.net
NEED HELP TUNING HOLLEY 950HP CARB - TEAM CHEVELLE
Dec 12, 2007 I have set up a FAST air/fuel wideband logger so I can tune this thing better...it's two channel with a bung just behind each collector. Engine is fairly mild with one of Harold's Voodoo HR's and the now-famous Morel lifters. From chevelles.com
Mar 13, 2013 I just put this carb on my 540 and have done the basic tuning for the street. It runs very well and feels very strong. I'm now looking at the jets that came with the carb- for a 950, do these jets seem huge? From chevelles.com
Aug 7, 2010 Drop your primary jet to 74 to start, you will need around .006-.008 larger PVCR to make it up for WOT. If you want to tune cruise just go down on the primary jet until you get where you want for cruising, go up on the PVCR's before you … From chevelles.com
CARB RECOMMENDATION: HOLLEY ULTRA XP 950 - FOR B BODIES ONLY …
Jun 4, 2018 Will a Holley Ultra XP 950 be too much carb? I'm putting together a fresh 440, built to make about 500-550 hp, maybe more depending on how good the port job is. Originally wanted to go with FiTech but the budget dictates I save some money here. From forbbodiesonly.com
HOLLEY 950 ULTRA HP CARB - PAGE 6 - DON TERRILL’S SPEED-TALK
Mar 11, 2023 there appear two issues with the Holley 950 Ultra XP. 1. The Venturis are too large with the inlet angle being greater than 30* 2. Number 1 causes the Venturi bottom air flow to churn causing reversion. 3. The down leg booster being 1.60", possibly too large has poor signal 1 & 2 … From speed-talk.com
NTK O2 SENSOR CALIBRATED FOR HOLLEY HP AND DOMINATOR . Fast shipping. Z.L. 02/24/2025 . MAD TOF LASER DISTANCE SENSOR 38" RANGE, FOR ANY BRAND ECU & HOLLEY CANBUS . Awesome company to deal with. Mike Jones . 02/23/2025 . HOLLEY EFI V5 TRACTION CNTRL ACTIVATION . From madracingparts.com
ULTRA XP OR QUICKFUEL CARB? - FOR A BODIES ONLY MOPAR FORUM
Apr 24, 2015 Hi: Looking for a carb for my stroked small block, mech solid cam, single plane intake , and finally get to this 2 options: Holley Ultra XP 950 80805BKX or Quickfuel Race-Q series RQ-950 (with the option to be annular or downleg) Any advice? Thanks in advance. From forabodiesonly.com
HIGH PERFORMANCE DYNO TUNING. - LUCASH RACING ENGINES
Lucash Racing Engines offers high performance Dyno tuning. We can dyno tune most engines and provide you with a computer printout of the results. Dyno tuning will give you all the data you need to perfect your combination. Call for an appointment. From lucashracingengines.com
Sep 16, 2020 The Ultra 950 with a 1.600 venturi has a poor design on the entrance shape to the venturi, it causes turbulence that disrupts flow and booster signal. I have tested three different ones on a flow bench with every booster I could, annulars are best but still doesn't fix it. From yellowbullet.com
NATIONAL SPEED - PERFORMANCE INSTALLATIONS & DYNO TUNING
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950 HOLLEY ULTRA HP NEED HELP TUNING | YELLOW BULLET FORUMS
May 7, 2013 This is an Ultra 950 with a 1.600 venturi, jetting will be around 90 or higher. Booster signal on these are not what I would like, as a result jet needs to be higher. One other I would do is plug the second e-bleed to start. From yellowbullet.com
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