Author Topic: New FD Owner Gloucestershire  (Read 443 times)

Offline neil_jdmr

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Re: New FD Owner Gloucestershire
« Reply #60 on: October 29, 2017, 06:14:53 PM »
What's your current boost pattern.
Standard sequential, standard engine, Oem body, 1.2bar, WI

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Offline Doz_FD3S

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Re: New FD Owner Gloucestershire
« Reply #61 on: October 29, 2017, 06:18:44 PM »
I'll try and get the vid up to demonstrate but basically it sits at 0.4 bar now regardless of rpm. I can lift off and tip in to sometimes get primary but when that happens it spikes up to over 0.8 so I feather it to try and maintain 0.7 ish but once it goes past 5k it fades off and feels hesitant with it. Almost like a rev limmiter but way softer. Fuel cut?

I need to compress the video to get it up here but it explains it alot easier.

When I first got the car primary boost was good but now since changing vac lines and replacing faulty parts it seems worse!

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Offline Doz_FD3S

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Re: New FD Owner Gloucestershire
« Reply #62 on: October 29, 2017, 06:24:24 PM »
https://youtu.be/qFdFgnKxew8

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Offline boosted

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Re: New FD Owner Gloucestershire
« Reply #63 on: October 29, 2017, 07:28:17 PM »
Defo not fuel cut...it comes in hard on overboost so rules that out...
With all the stuff youve change...not sure what to suggest...
If it aint boost control...
Dieing fuel pump clog fuel filter...blocked cat...if still in...
But the way it dies and recovers does seem like boost leak tome...have you checked the hard pipe outlet on 2nd turbo rear 2 bolt flange?


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Offline Doz_FD3S

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Re: New FD Owner Gloucestershire
« Reply #64 on: October 29, 2017, 07:44:14 PM »
Hmm yeah it's an odd one. Although the times in that video where it's making around 0.4 bar, I'm not just holding back at that, it's all it'll give! Then lift off, tip back in and I  (sometimes) get more boost again.

It still has the cat in. I was going to change the fuel filter as part of a service anyway.

I just don't understand why before changing the valve block I got atleast primary boost repeatably and now I more often than not get the 0.4 bar.

Valve block is new genuine mazda and I tested all the solenoids.

I checked all the turbo outlets as part of having it all apart.

Also checked the ecu that's deffo stock. Tempted to get the multimeter out and check all the wiring to the solenoids etc is good.

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Offline boosted

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Re: New FD Owner Gloucestershire
« Reply #65 on: October 29, 2017, 07:53:49 PM »
Yes some pinout testing from ecu to solenoids ...you got powerprobe? You can test continuity of wires easily with it...
So checking solenoids for actually air flow as well as continuity?.all check valves in the right way...you may have introduced a fault with all the work youve done...it happens ive done it....
At 0.4 bar never gonna see 2nd come online so thats where to restart.
Bloody frustrating for you.
I suspect youve googled and have all the rx7club info from the states to follow?


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Offline Doz_FD3S

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Re: New FD Owner Gloucestershire
« Reply #66 on: October 29, 2017, 08:04:03 PM »
Yeah been through all the info online. Tested all solenoids with a power probe and checked flow. Didn't check the flow for the ones in the valve block so could re-visit that. Triple checked that the one way valves where the right way round.

Only iffy one that's yet to be changed is the fuel purge valve. Can't see How this would give a boost issue though as it's failed closed and there's a one way valve between it and the intake.

I can't hear a boost leak but worth testing all the intercooler too. I've replaced all the silicone joiner hoses and clams as I didn't like the blue ones that where on there.

Checking all the loom for continuity back to the ecu is worthwhile for piece of mind. Can't rule anything out with a 21yr old car I suppose.




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Offline boosted

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Re: New FD Owner Gloucestershire
« Reply #67 on: October 29, 2017, 08:04:57 PM »
I still think boost leak though...have u taken all the couplers off the car and manipulted them only needs a tiny tear and the boost will open the hole bigger n bigger. Y pipe and top n bottom ic connector. Cheap enough just to get new silicone ones.

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Re: New FD Owner Gloucestershire
« Reply #68 on: October 29, 2017, 08:22:29 PM »
My couplers are triple ply and all my clamps are genuine jubilees..done up real tight...no ebay jobbies got from Merlin motorsport.

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Offline neil_jdmr

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Re: New FD Owner Gloucestershire
« Reply #69 on: October 29, 2017, 08:54:05 PM »
From your video a lot of the low boost is transition related. What i mean is once in primary boost and following transiting at 4.5k upwards then obviously your in seq operation. To allow the system to return back to just primary you must be below 3k rpm. This is the equalizing pressure in the charge control circuit. Tbh unless your dead set on keeping a standard car more than a fun car to drive i would think about a ecu and binning the cat.  Your in the south so rotary experts are all pretty close to you and if your happy you have exhausted all leak possibilities then that would be my best advice. Initially i struggled for a year with my boost trailing off and a specialist fixed it in 20 mins. After a pfc mapped with just the cat removed i gained 70hp and the cat ran faultless at 0.9 bar to redline.

If you had primary boost and now you don't then something you have bought/fitted doesnt work.  This sadly happens far too often with older performance cars
Standard sequential, standard engine, Oem body, 1.2bar, WI

Twins retired. KKK K27 1.25bar courtesy of Jason and Stu

Offline jdesousa

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Re: New FD Owner Gloucestershire
« Reply #70 on: October 29, 2017, 10:46:28 PM »
I think you covered it already but mine did the same after a turbo rebuild and turned out to be missing pils. Thought I'd mention it.

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Offline Doz_FD3S

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Re: New FD Owner Gloucestershire
« Reply #71 on: November 02, 2017, 06:01:47 PM »
Cheers guys, ideally I do want to keep it standard really. To the point that once this is sorted I'm going to try find a stock steering wheel and front lip. Not a fan of the carbon fibre stuff personally.

Hear what your saying but I don't want to let it defeat me. I don't use it every day and it won't get used much If at all in the winter so there's no rush. I'll make sure I'm happy I've exhausted everything I can check and test myself. If this comes to no success then I'll give hayward rotary or someone a call. They're not too far from me.

I'm trying to get hold of a smoke tester to check for boost leaks. I'll double check the actuators etc again, agree it's totally plausible for replaced parts to be at fault. I'm also going to check the loom from solenoids back to ecu plug. Generally just making sure I've deffo exhausted all of my capability.

As suggested above the 1996+ boost system differs in a few ways from earlier cars so I don't have boost pills.

I'll keep you all posted with further developments!

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