Hi I have put a evo 7 engine into my evo 6. I have done my best to set it all up to how it was on my old engine... The evo 7 engine has a stock turbo and it did have a ALS system witch I removed. I put my evo 6 inlet manifold on so there's no sensors at all.. when I removed the EGR system I was left with 2 holes in the exhaust manifold witch I plugged with some bolts???? Is that the right thing to do?? cause of how the manifold joins the 2 ports together on each end....???
My car runs like a ***** when I drive slow.. It stars ok an idles ok maybe with a slight miss. When I drive it slow it like starves for fuel with like a flat spot... When I give it some revs an boost it drives like it should.. all good under load..
I don't know what to do. I have changed just about every thing over from my old engine.. No vacuum leaks. The only thing l can think of is the manifold were the ALS was in place.. Any ideas would much appreciated..

 

Two holes in your exhaust manifold or intake manifold

 

The two holes are for the als system... The egr is only active at cruise/idle conditions so it makes sense drive slow would stumble. You can have the egr system turned off via tuning or at least 0 out the cells to make the computer never turn it on. I hope that helps... Also i assume the ports that feed the egr solenoid vacuum are still located on the throttle body? Make sure those are plugged extremely well...

 

Regarding the holes in your exhaust manifold. Those were probably for the ALS. You can plug them with appropriately sized (both length and width) bolts, but I'd recommend using some high temperature anti seize on them so they seal better, and are able to be removed with minimal damage should you ever want ALS.

 

Thanks for the reply.. Im not sure what you mean when you say 0 out the cells?
AS for the egr set up.. I have put my original manifold on, it has no egr parts on it at all, no censors just 1 vacuum line that goes to the fuel tank breather.. 1 for the Fuel reg, 1 for the blow off an 1 for the boost controller an boost gauge. And I'm running the same computer.. I'm not sure why the computer would think the egr is connected.. My car used to run fine before I swapped engines... Another thing I should mention is I was running a GT 35/40 turbo.. all the piping from inter cooler, throttle body etc is still the same size but reduced down at the turbo end for the standard turbo .. could the piping be to big for the standard turbo?? could this cause it to run rough at low revs??? To me it feels like a fuel problem, like its delayed?? The bolts I used for the holes in the manifold are only have the length of the banjo bolts... Is ok? or do the have to be the same length??

 

You should sell that Evo 7 mainfold, and probably change that and the tb out for an 8/9 one.

 

ok. so do you think a turbo from a 8 or 9 is a good upgrade??? with a standard manifold ??? or do I need to get a custom manifold ??? Whats the best option???

 

Lots of posts on here about which turbo to run.

The "best" stock turbo is definitely the Evo 9 turbo though. But I'd solve the problem first...