OBX ITB's..... Help.

[simon-says]

I'll make this short and sweet.

I have idleing problems with these ITB's.
2500rpm's fully closed.

Megasquirt 3
9A block
X-Flow head
11.5:1 comp.
278 cam
1mm oversized valves
JE FSR pistons
Any help would be appreciated. Thanks.

[SirSpectre]

You'd get a better response in the SEM, ITB/ Carb forum. BUT Yes. You will have idle problems with ITBs. Its just the way it is. ITBs are SSSSSUUUUPPPPPERRRR hard to get to idle well.

Which tuning method are you using? Alpha-N or MAP? At any rate, try running it a little rich at idle. Warm it up and see if it gets better when not cold.

[Hurt]

278 cam? Do you mean 288? Or 298?
ITB's are a PITA to tune. I'd look into your software if you can. Maybe have an expert take a look, maybe they can fix it?

[simon-says]

You'd get a better response in the SEM, ITB/ Carb forum. BUT Yes. You will have idle problems with ITBs. Its just the way it is. ITBs are SSSSSUUUUPPPPPERRRR hard to get to idle well.

Which tuning method are you using? Alpha-N or MAP? At any rate, try running it a little rich at idle. Warm it up and see if it gets better when not cold.

I'm running the MS3X full seq. I am running the blend ITB setting. Today I went back and re did the tb settings and got it to idle a little lower.(1350rpms from 2700rpms). I am running it a little more richer to help it from getting soo hot so quickly.
Thanks for the reply.

278 cam? Do you mean 288? Or 298?
ITB's are a PITA to tune. I'd look into your software if you can. Maybe have an expert take a look, maybe they can fix it?

Yes the cam is a TT276* sorry had to remember. The software is definitely the next move.
Thanks for your reply as well.

[Hurt]

I'm running the MS3X full seq. I am running the blend ITB setting. Today I went back and re did the tb settings and got it to idle a little lower.(1350rpms from 2700rpms). I am running it a little more richer to help it from getting soo hot so quickly.
Thanks for the reply.

Yes the cam is a TT276* sorry had to remember. The software is definitely the next move.
Thanks for your reply as well.

If this car isn't driven daily, go with a 288* or even a 298*. You won't regret it!

No problem, I'm always willing to put my $0.02 in!

[spitfire1]

lower it!!!!!

[simon-says]

Okay so,

I have done about 3hrs. of research and a friend has also helped out. And we came up with this.


DOW CORNING MOLYKOTE 321.



This is used by FORD and Mitsubishi on their throttle bodies. They say to never clean them! If you do clean them, then you need to reapply this stuff to the butterfly/bore. Let it dry and crack open the butterfly, adjust your idle stop screw. Enjoy your low idle setting.

I will install the manifold in the morning along with the new phenolic spacer. (helps keep the fuel rail cool) I bet with the stop screw out all the way, it wont start. Screw in the stop screw until it idles.

:beer

[spitfire1]

did you lower it, cause you should

[The Green]

mine leaked everywhere.. everywhere..

removed the butterflies and welded everyhole shut, using 1 big TB