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Feb 5, 2024 | 10:59 AM

#21

Nylonpunk

Junior Member

Joined: Jan 2024

Posts: 5

Likes: 1

From: NJ

Quote:

Originally Posted by 1983turbojaguarxj6

It could be a number of things, what’s your air/fuel ratio? Are the turbo’s sized correctly? Being twin turbo, it should be efficient and spool pretty quick.

Forgot to answer my AFR is 11.5 at idle and 11.75 at cruise. Somewhere between at WOT

Feb 5, 2024 | 11:01 AM

#22

Nylonpunk

Junior Member

Joined: Jan 2024

Posts: 5

Likes: 1

From: NJ

Quote:

Originally Posted by LT1 jaguar

The installation of Nylonpunk will need more carb attention (modification) and fuel/air tuning than an engine with fuel injection.

Dave

Well noted.

I think I need a pro now. Anyone have any good ones in Northeast NJ?

LMK, Thank you for your replys!

Feb 6, 2024 | 04:19 AM

#23

LT1 jaguar

Veteran Member

Joined: Dec 2018

Posts: 1,893

Likes: 1,384

From: Wasilla,Alaska

Here is a useful article from Holley on tuning and function of the power valve. Your A/F is way to rich at idle and highway cruise and you should check your vacuum at idle and cruise. How much did you drill out the restrictor holes behind the power valve? An 850 DP is a pretty big carb for a street SBC even with turbo's. You mention your A/F ratio is about the same at WOT as at idle/cruise. 11.5 is good for WOT, but never for idle or light throttle cruise, find out why its running rich and from where.

https://www.holley.com/blog/post/how...ey_carburetor/

Dave