TQ tuning issue using M1 intake (SB stroker)
#825953
10/10/10 01:24 AM
10/10/10 01:24 AM
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Joined: Jan 2003
Posts: 3,943 Melbourne.....Oz-land
Moparmal
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Melbourne.....Oz-land
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Anyone had problems running a TQ on a M1 SB ?
Specifically, the low speed / idle circuit runs waaaay lean , and no amount jetting up or rod changes has an effect.
Anyone got any solutions so I can keep using this carb?
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.
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Re: TQ tuning issue using M1 intake (SB stroker)
[Re: ScottSmith_Harms]
#825955
10/10/10 03:00 AM
10/10/10 03:00 AM
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Joined: Jan 2003
Posts: 3,943 Melbourne.....Oz-land
Moparmal
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SSH - I just swapped the M1 in - I had a vac guage on it this morning - its reading around 13 at 900 rpm, but it does waiver a little beween 10 and 13. I did the leak test with fluid around the intake flange but it had no effect.... As soon as you blip the throttle, and as the rpms come down, the Vac drops to almost zero and the engine flutters and almost dies. Because its been so badly behaved at low speed, I assumed it was the low speed circuit - (I checked all the carb gaskets and this carb ran 12.6 at the track last weekend on an LD340) Are you saying that the TQ shouldn't be effected by the M1 this badly?
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Re: TQ tuning issue using M1 intake (SB stroker)
[Re: ademon]
#825958
10/10/10 03:50 AM
10/10/10 03:50 AM
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Posts: 3,943 Melbourne.....Oz-land
Moparmal
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ademon - in a round about way you've answered the problem. I needed to know if these SP intakes caused issues with TQs - clearly as your running one on a non stock 360 , this tells me the TQ circuitry can work fine on an M1. Obviously my problem is elsewhere - and I'm thinking SSH is right, and its a Vac leak. I've had TQs a long time - there's no issue with the calibration - except that I knew something was up when I had to go so rich on the primaries and it still showed lean on the AF guage. I just hope this intake is not porous - I bought it off a member here.
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Re: TQ tuning issue using M1 intake (SB stroker)
[Re: ademon]
#825964
10/10/10 04:46 AM
10/10/10 04:46 AM
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Joined: Jan 2003
Posts: 3,943 Melbourne.....Oz-land
Moparmal
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@ ademon - I realised I had a problem when I went to .107th primaries and it showed lean at 16 AF on the AF guage at 2100 rpm in top gear. Please note: Last weekend I ran 12.6 with the LD340 - AF guage read 12.5 at idle, 14-15 at cruise, 12.4 at WOT in 3rd. When you see that the WB AF guage shows pretty accurate readings - I start to worry when I have 16s AF and I'm running .107 primaries with the tree on 5 turns (1996 rods too) !!! The car drives like a pig as well -fluttering off idle and other issues. To run it that rich and still show a lean - ish mixture - there's something not right.
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Re: TQ tuning issue using M1 intake (SB stroker)
[Re: Moparmal]
#825965
10/10/10 11:56 AM
10/10/10 11:56 AM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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It is possible to be rich and show lean if the mix is not being ignited. The sensor reads the oxygen not the fuel and if the mix does not burn it will read that unburned oxygen as a lean condition. I think it would be worthwhile to throw a set of new plugs in, mabey one got fouled out then you started throwing fuel at it to cure the lean condition and wreaked all kinds of havok on it. The single plane intake will give less signal to the carb and require a touch more fuel. I would try putting a piece of wire in the idle air bleed and see if that helps, if it does then you need to shrink the air bleeds. It sounds like your problems are with the idle circuit and since it is not makeing the proper air fuel mix then when you open the throttle there is not enough signal to get the other circuits pulling fuel properly. But again before I changed the carb any more I would check the ign system and throw in some new plugs.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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