301t Won't idle

[Cliff Ruggles]

The long thin tubes are secondary air, the outer tubes are POE.

Fuel level in the bowl has an impact on how much fuel is metered with any particular fuel pressure and fuel inlet seat diameter......Cliff

[canadian nascar]

Hi Cliff,

I know which tubes you mean, so I will drill out the tip .036-.040. correct. to change the a/f at wot.?

thanks again Kevin

[Cliff Ruggles]

Opening them up will have a minor effect on full throtte A/F, as it adds more emulsion air to the incoming fuel.....Cliff

[canadian nascar]

Hi Guys,

trying to launch from a stand still.

my car has a 2500 stall but is at 0 boost vacumm at 2100rpm foot braking and wot, i can hold the car to 2500rpm. at 2500 i have 3-4 lbs of boost but it will run on the primaries untill 3000 rpm then the secondaries come on but my 0-60ft is 4secs.

how do i get the secondaries to come in at 2200-2500 rpm?

the secondaries come in hard when they do and rolling at 20mph or higher they come in instantly.

thanks Kevin

[Cliff Ruggles]

Yikes, 4 seconds is really lagging.  Might want to contact some folks who drive and race the turbo 301's.  I have no experience here with them, even though I build Pontiac engines and street drive and race my Ventura with a 455 in it......Cliff

[canadian nascar]

 front choke pull off is 5 seconds to fully release, this is some of the problem. how do i adjust this?

thanks Kevin

[canadian nascar]

I was wondering if all you do is drill out the end that the vacumm line goes on, the larger hole allows more air to return. used as a air flow restrictor?

thanks Kevin

[Cliff Ruggles]

We sell them already modified, really nice units with the straight inlet for easy access to the restriction......Cliff

[canadian nascar]

Hi Cliff,

I am getting closer, I recieved the choke pull off  3 seconds and it helped considerably,i can get to the secondaries during a brake stand now.

my next problem is I have a bad lean bog going to the secondaries, this was not a problem withthe old turbo, I have adj the sec. spring tension all over the place till the flaps wouln't open all the way.

I have read Cliff's book and he filed the sec. flaps to allow the secondary accelerator ports fuel to flow better so I did this and opened the ports up. stock size hole was .059 now .070 and still major lean bog with spring tension not helping. and cleaning all ports with brake clean.

How big can I go with the ports?

also the float is 5/16'' as 1/4'' would flood the carb at idle, should I raise it a little more?

thanks Kevin

[canadian nascar]

Hi,

just read that stock float height is 15/32, is 5/16 too high and causing problems?

thanks Kevin

[canadian nascar]

also forgot to remention inlet seat .135 fuel pressure 7psi

Kevin

[Cliff Ruggles]

You should not experience flooding at any setting, if the float and needle/seat are doing there job?

Raising the float simply raises the fuel level, it wouldn't flood unless the float was hitting the gasket or being held down by something as it tries to raise up to seal off the needle....Cliff

[canadian nascar]

Hi Cliff,

I  will try the 1/4'' float level again.

In the previous post I wrote that i have haveing a terrible time trying to get rid of the lean bog, last year it was so easy. I put JB weld in the holes and am going to redrill the holes according to your book.

took it apart again yesterday and the tubes were a little loose so i pulled them and checked for debris, didn't see any thing, put all back together and tried again. still lean bog tighened up the spring some again, anywhere from 1/2 to 1 1/2 tight and still lean bog with .07 POE hole.
 
Any ideas on how to get rid of it

stock turbo I was able to get rid of it.

later Kevin

[Cliff Ruggles]

Have you tried shortening the primary accl pump shaft slightly?  It may need a bit more fuel from the accl pump.....Cliff

[canadian nascar]

Hi Cliff,

It's been a while, I have no lean bog now in seat dyno, but the wide band shows one, when I go wot, I took a bit more than a 1/16'' off the accl pump.

I have a bit of smoke when I start the car, rich at idle but wideband shows 17-1 afr, idles starts good. Should I go leaner?

The 5 second 60ft was all fixed with going to a higher stall converter, was told by Buick 3.8turbo guys that I should have a 2800 stall but ends up a 2600 10'' converter. I can really lay a strip now, and if I cruise at 30mph and go wot it will start fishtailing.

Lastly the wot is 10-1afr for a moment then goes to 11.5-1afr. Some more fine tuning is needed but storage will be in a couple weeks.

later Kevin