Track Warrior 850 WOT jetting

[Duh]

The car is a 437 BBO, 4300#, 5000 stall, 430gr, T350, usaly runs 11.5's @115+ in 1800 DA with my 950 HP.

I now have a Track Warrior 850 (seems to be an updated 1000HP) out of the box it ran lean WOT, lost some et and MPH. I changed the emulsion to 26,X,X,26,X, 25MAB, 6.5fpv, 88f, 97r. The car runs about 12.8afr at WOT now. Just seems like alot of jet. I'll test it this weekend.

[jmarkaudio]

What type of hood, and how much clearance above the carb?

[Duh]

It's tight. Stock flat hood. I have a Moroso 14x3 air filter. It sits about 1/4" away from the hood that I trimmed the supports out of. Measuring the filter opening to lid it's 2.5".

[Duh]

I thought about that gestion. Yesterday before I put the slicks on and loaded up I took out the .5 carb spacer and put my 3.5" tall filter in. On the street it was worth a a solid .2 AFR. Today at the track high gear was 13.5 AFR. The car ran in the 11.4's at about 1800 DA. I'm still thinking it's alot of jet. Possibility that the venturi a bit too big causing velocity to drop off?

[RFSPHPbb]

13.5 is lean for WOT operation. why don't you put two sizes bigger jets all around and see if it fattens up a little. Cheap and easy.

[Duh]

Oops, being a little lexiadys lol
It was 12.5, sorry about that.

[RFSPHPbb]

>>>> lexiadys lol

is that like my drain bamage?

[Duh]

I resemble that remark.

[BradH]

Any updates to this post? I'm curious how the subject carb's tune is coming along.

FWIW, as far as "it seems like a lot of jet", if the 1.56" venturi is paired w/ so-so down-leg boosters, it may simply require that much. I don't know if Holley even uses stepped boosters in the 850 Track Warrior. I do know their 134-302SA replacement main body that looks like the same part used in this carb doesn't come with stepped boosters when purchased separately.

[Duh]

It's definitely the standard Holley down leg stepped booster. I thought the 850 would be very similar to the old 1000HP. I had no issues with the 1000.


The week after I went to a TT. I brought the 850, my pieced together 950HP and a 750 Brawler. I based line the car with the 850, 1.54/11.49/116.
Next was the 950. I put a few passes on to jet it final 74/82, ran three back to back 1.54/11.45/116.3. Right at the end I put the 750 on box stock with only change being 37 shooters. It ran pig rich on top 11.53/115.1. the big surprise was 1.524 60 ft. In the end I put the 950 back on. Since it runs rich at idle and part I put the adjustable 850 metering blocks on. It runs really well like that. I have not been able to get back to the track yet.