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My GTR swapped Escort headache (need the experts)

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    My GTR swapped Escort headache (need the experts)

    Just to give a little history before I start the questions so people know what I’m working with.

    I have a GTR engine swapped into an escort. I had the engine running stock with stock GTR ECU, injectors, VAF everything seamed fine. One day I was getting low oil pressure like 5-7psi at idle. I pulled the engine apart and saw that cyl #3 rod bearing was toast. So I put new bearings in the bottom end and sent the head out to get rebuilt (I figured might as well since I have it all apart). Got all the pieces back and assembled the engine. It ran for about 500 miles and I noticed a grinding/ticking noise from the head. I pulled the valve cover and saw that the exhaust cam lobs and journals were all torn up. I took it into the shop that did the head work and we came to the conclusion of oil contamination. So at this point the BP26 head was garbage and the cams were garbage and piston skirts and bore were scored up. I had a BP05 head lying around and bought some CS adjustable cam gears, and also rebuild the entire engine again.

    This is how it sits now
    -BP05 head
    -BP05 cams with adjustable cam gears setting lobe centers the same as GTR cams. Only difference now is more lift and 3deg more duration on exhaust cam
    -+.020 Wiseco 8.5-8.8 pistons
    -Eagle rods
    -ARP head studs and main studs
    -stock VJ23 turbo
    -3" DP and 3" full exhaust only one magnaflow muffler at tailpipe
    -large Ebay FMIC
    -HKS SSQV set up as bypass rather than atmospheric dump
    -stock GTR injectors with resister packs
    -stock GTR VAF
    -stock GTR ECU


    Now the stock GTR ecu is the part I’m having trouble/question about. With this build for some reason without changing anything on the tune I am running about 20-22 psi boost pressure and AFRs mid 10:1 to low 11:1 WOT the car is pulling nicely engine seams smooth but I question how safe this is on the stock tune.

    So my thoughts with the longer exhaust duration and lift, slightly higher compression pistons (from 8.2 to 8.5/8.8), a non restrictive 3" exhaust, and less restrictive BP05 head is why I’m getting more boost but why isn’t the stock GTR EBC opening the wastegate more to compensate? Is the port on the wastegate not big enough to bypass that much pressure?

    I wanted to run as close to stock GTR as possible to keep this reliable and streetable, and avoid tuing headache but it’s obviously not turning out that way. This has been a rollercoaster ride for like 5 years.

    So what are your thoughts to why it’s running so much boost, so rich, and is it safe? (Is there anyway to dial boost down with the stock GTR controllers?) And should I just give up on the stock ECU and go megasquirt?

    : Experts chime in:

    #2
    I wouldn't worry about it the stock ecu runs rich in boost. turn up the boost if you don't like running that rich. I would guess the vaf is maxing out and when that happens the injectors are running at Max duty cycle. What octane of fuel are you running? If your running 93 octane I wouldn't worry about running high boost.
    Last edited by Boosted Escort; 09-04-2013, 03:42 PM.
    bp swapped escort lx, gtr ecu, gtr intake manifold, A code VAF, rx7 460cc injectors, ky clutch, holset hy35 turbo on 8lbs, 38mm tial wastegate, ramhorn manifold, full 3 inch ss exhaust, walbro 255 fuel pump

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