Jetting Suggestions for Raby T4 in San Diego, Ca

STU - maybe put in a call to Kevin 'SOC Coolryde' at Mendeola Performance Suspensions in San Diego (619)710-4946!

those look about right.

my mains are 130, but i have a 2056 t4

thanks mango & jim...car runs good as is, but because I just received the engine manual from the previous owner and was looking through the spec sheet, I thought I would email Jake and hear his thoughts too...just looking to have some fine tuning done to the engine 

You look good, Stu. 

How does it run? You could run a little richer (57-60 idles, 155-60 mains) but if the car is smooth with quick throttle response and running cool there's no reason to change anything.

Thanks Terry!

Car runs strong, great throttle response (via SyncLink  - glad you like yours).

2 things - Car starts without issue and once warm will idle around 1,000 rpm. After driving car and coming to stop light, car idle will stay at 1,600 to 1,700 rpm. And once car has been driven, if it sits for a short amount of time (15 to 30 min), upon restart the car seems to cough & pop some until you start down the road then it seems to settle down again. No heat issues either - car runs very cool. Thoughts?

Dan, I'm glad you got some responses to your question regarding proper jetting.  As mentioned above by , I'd suggest you buy (4) 57 or 58 idle jets and some 155 main jets and try them.  If the engine  stumbles  a bit under 3,000 RPM's, then return to your original 55's.    If the engine stumbles when accelerating above 3,400 then return to your original main jets.

 If as you explained, the idle is high after driving the car, get out of your car with the idle 'high' and check to see if there is any binding in the throttle mechanism.   You can grab one or both of the pulleys and twist them to the closed position.  If they move then you have binding.   If not then it's something else.

Thanks for the tips Larry!! 

Stu,

My gas pedal hangs up on the first 1/2" of play. That's why I installed a spring at the pedal. Take a look at the photo in my thread about the SyncLink.

You'd be smart to go straight to the source---Jake Raby. He can tell you what elevation he set up the carbs for and what jet adjustments might work given the elevation at your location.

You are going to love that engine! 

Get a wideband O2 sensor and monitor for a while, then make changes as needed. Best money I ever spent on my car.

Dan,

The jettig you have is not far off. I will say I've heard and seen first hand the Empi carbs acting up like your saying it does. I would throw the empis up for sale and invest in a good set of Webers. The jetting the come with stock should be pretty much nuts on for a cali car with the size engine.

Thanks Kevin!

If I can't get them dialed in I may have to go that route!

According to Jake, he's ''perfected'' a way to make the IMPI's work properly.  'Supposidly' he's re-worked the innards and says they work as well or better than  Italian or Spanish Webers.     Personally, I wouldn't spend the money for new carburetors.

Thanks Larry !! No, I wouldn't change the carbs unless it was the last resort. The engine only has 1,600 miles on it (700 when I got it) and it pulls very strong  I'm sure I'll be able to get the higher than average idle issue and occasional pop worked out. After all...you're not too far away from me !!! 

Dan,

Did you try the spring on the gas pedal yet?

Hey Terry...meant to send this before, but it looks as though I also have the spring installed!!!

@Larry...

Before any optimization can occur a wideband O2 meter must be employed to verify enrichment. California oxygenated fuel is much different that the tuning that we specified for that engine. It was originally employed in the mid-west.

If it runs fine and stays cool I wouldn't touch it.

I would find a shop with a rolling dyno who works on VW's and have them set it up, best money I ever spent. If you do not know of any shops close to you ask on this website ,   http://ultimateaircooled.com/s...hinesforum/index.php  , the guys are very helpful . Mike McCarthy