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IPD Turbo Cam = Lower boost AFR?

maxitoman007

maxitoman007

Member
Joined
Feb 15, 2017
Location
Calgary, Alberta, Canada
I currently have an EBay T3/T4 turbo pushing ~25psi on my 87 Volvo 740 turbo. I have also installed browntops for added fuel, but even after ?tuning? full lean using the MAF adjustment screw, I am still in 10s up top based on my wideband. I recently purchased an IPD Turbo cam and I?m wondering if it could help with my rich AFR issue under boost. Could retarding the timing to move the power band up help even more (I do have an adjustable cam gear installed)?

Anybody have any experience with this?
 
Maybe you aren't burning the fuel up top? What plug gap are you running? Have you done anything to have a bit more spark energy? It will be rich if you can't burn what is getting sprayed in there. 25psi should have something upgraded to light that fire.
 
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dl242gt said:
Maybe you aren't burning the fuel up top? What plug gap are you running? Have you done anything to have a bit more spark energy? It will be rich if you can't burn what is getting sprayed in there. 25psi should have something upgraded to light that fire.
Click to expand...

Just purchased an MSD-6a so hopefully that helps!
 
Is the wideband placed far enough back in the down pipe and calibrated well?

Atleast its rich and not lean, and you pay attention to your wide-band
<a href="https://ibb.co/HHJ9dx0"><img src="https://i.ibb.co/HHJ9dx0/20200104-224609.jpg" alt="20200104-224609" border="0"></a>
 
Dubious it’s so rich at 25psi and browntops, but it’s been a decade since I’ve seen a 530 and Tcam
 
James M said:
Is the wideband placed far enough back in the down pipe and calibrated well?

Atleast its rich and not lean, and you pay attention to your wide-band
<a href="https://ibb.co/HHJ9dx0"><img src="https://i.ibb.co/HHJ9dx0/20200104-224609.jpg" alt="20200104-224609" border="0"></a>
Click to expand...

To the best of my knowledge it is calibrated correctly. Reads around 14.4 at idle.
 
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