Boosting Problem

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mr299ron
Posts: 276
Joined: Sat Sep 19, 2015 9:32 pm

Boosting Problem

Post by mr299ron »

Some of you might be aware of the threads I created a little while ago about over boosting after fitting a 3" DP. A lot of you seemed to suggest it was the wastegate getting stuck on the DP, so that's what I took with me when going to JDModified.

The car has been there since yesterday, and when I called up they said that the wastegate catching wasn't the issue, but rather that the line from the actuator to the VSV was blocked off improperly with blue tac (oops) and that this could be causing your overboost. As fitting an MBC didn't bring the boost below 18-20 I just removed it, but left the actuator to the VSV disconnected as having it all connected as normal with the dp was what I had before and what caused 20psi boost. With it disconnected and no VSV I would always hit 15psi, which is fine, but I want a proper non-bodged setup.

Could something have been blocked that I wasn't aware of that caused high boost after fitting a DP? I messed with blocking the actuator to the vsv as I thought this is what was needed to do when fitting an MBC.

Surely, taking the blue tac out of this line "around the back of the actuator to the solenoid" and fitting an MBC wouldn't solve the issue?

I'm just a bit confused and worried I'm going to get a huge bill as it doesn't make too much sense.

Just to summarise a bit:

- Boosting to 20psi after 3" dp fitted with vsv connected (everything normal)

- disconnected actuator to vsv and connected mbc. still over boosting. (go figure)

- removed MBC and left vsv to actuator disconnected which reduced boost to a maximum of 15psi.

- garage thinks this is what was causing an overboost.

Just a little confused and hope someone can set me straight.

FYI the car is still there.

Thanks in advance
jimGTS
Posts: 14024
Joined: Tue Dec 14, 2004 1:40 pm
Location: North Kent

Re: Boosting Problem

Post by jimGTS »

am i correct in saying you was the one to place blue tac???

](*,)

you NEED to block (seal from pressured air) the tvsv line, both at the tvsv, and at the actuator if installing a boost controller.


why on earth blue tac is anywhere near your car just boggles the mind.
mr299ron
Posts: 276
Joined: Sat Sep 19, 2015 9:32 pm

Re: Boosting Problem

Post by mr299ron »

Has worked previously, but yes, I was being a bit of an inpatient prat. But we all live and learn.

It was more of a temporary thing as I was experimenting with the setup. The boost controller isn't installed and the car is hitting 15psi. But the VSV and the actuator are blocked off still (sort of).
mr299ron
Posts: 276
Joined: Sat Sep 19, 2015 9:32 pm

Re: Boosting Problem

Post by mr299ron »

Issue sorted.

The wastegate wasn't catching on the downpipe, I think the previous owner also tried bodging it to get more power, failed (as cat was blocking airflow before removing), then put it back to normal. I then added to that fail, and James at JDModified sorted it, plumbed in an MBC and now it's perfect.

I rarely see any posts about JDModified and I have to say they are a great bunch of guys. Highly recommend them!

Feel like a retard (nothing unusual), but you learn and it's sorted :)
shinny
Posts: 2345
Joined: Mon Nov 27, 2006 4:59 pm
Location: Reading, UK

Re: Boosting Problem

Post by shinny »

Opps - I got distracted (you know, by my day job) while replying here. Glad it's sorted though.

mr299ron wrote:I rarely see any posts about JDModified and I have to say they are a great bunch of guys. Highly recommend them!


My experience of JD Modified is the exact opposite.

The last time I got my car back from there it very quickly became apparent the mechanic who worked on my car didn't know how to connect a boost controller to a standard actuator, causing the car to hit fuel cut at 4000rpm, despite James assuring me he'd personally test driven the car and everything was fine. (He clearly hadn't bothered using full throttle)

Maybe their standards have bucked up since then, cos I found a long list of issues with their work a couple of years ago.
mr299ron
Posts: 276
Joined: Sat Sep 19, 2015 9:32 pm

Re: Boosting Problem

Post by mr299ron »

Fuel cut is what 12/13 psi on the rev 1 and 2s? You'd never need to remove/adjust fuel cut unless you were raising boost, so from my pov here I feel as though that's your fault? I'm sure it wasn't, but that's just what it looks like.

What else did you have done? Just that?
shinny
Posts: 2345
Joined: Mon Nov 27, 2006 4:59 pm
Location: Reading, UK

Re: Boosting Problem

Post by shinny »

mr299ron wrote:Fuel cut is what 12/13 psi on the rev 1 and 2s? You'd never need to remove/adjust fuel cut unless you were raising boost, so from my pov here I feel as though that's your fault? I'm sure it wasn't, but that's just what it looks like.

What else did you have done? Just that?


Well I didn't intend this to be a full on rant at JD Modified, but I'm not going to sit back while you try to blame me for their incompetence!! [-(

Um... firstly my car is a rev3. And no, you didn't need to touch the boost cut. They took a turbo that I had preconfigured to run only actuator pressure (so I could hook up the EBC later) and connected it to my boost solenoid in such a way that the wastegate would never open, leading to an uncontrolled rise in boost. I couldn't believe how badly it was done so i made some diagrams at the time...

This is how I presented the turbo:

Image

This is how a boost solenoid would be corrected connected:

Image

And this is how they actually connected it:

Image

There's also the saga of the bodged oil pipes that caused me to miss two track days. Basically when creating me a custom exhaust manifold, they had an alignment issue that meant the oil pipe didn't fit. The technician doing the job decided to cut the solid metal oil return pipe and replace it with unprotected rubber hose. This burnt through (because turbos and exhaust manifolds get very hot, hence why Toyota made it solid metal!) and dumped my oil all over my engine. They replaced this with another rubber hose wrapped in essentially tin foil. This also failed, dumping my oil all over my engine again. I gave the car back to them again and they fitted a third rubber pipe and I simply refused to take the car back from them like that, which led to the turbo swap with the actuator plumbing issue. (James raved about how making manifolds is his thing but the performance of the manifold he made me was very poor - lots of lag and boost instability. I've had a few turbo configurations on the car and using his manifold was easily the worst)

I've also twice had issues with them positioning my charge cooler such that the pressure cap rubbed on the engine cover and undid itself within 100 miles, unloading the charge cooler fluid over my engine. There was also the mysterious case when I discovering my air filter had taken a massive knock and was crumpled immediately after collecting my car from them; given they would have given the filter off for that job, I challenged them. The response came back "oh yeah, the boys noticed that. Didn't they say anything?" and they blamed the location of my intake piping. Funnily enough, I've never had a problem with any other filter I've placed in that location, but I can't say for certain if the filter was damaged when at the garage or not. I just find it suspicious, given the string of other issues I had.

They did manage to do one job without problems. They replaced the flexi in my exhaust without anything failing as a direct result.

I suspect a fair amount of the above was due to one junior technician and it was a couple of years ago so maybe he's moved and standards have improved again. But they made three mistakes on my car that could easily have killed my engine and kept on trying to replace their bodged oil return feed with exactly the same bodge to the point that I had to tell them that if it failed twice, they probably shouldn't do it a third time. (Why on earth they didn't just use some braided hose, I have no idea!) It all left me wondering why I was paying them money to repeatedly make engine-threatening mistakes; I find my own labour more reliable and more cost effective.
mr299ron
Posts: 276
Joined: Sat Sep 19, 2015 9:32 pm

Re: Boosting Problem

Post by mr299ron »

I wasn't blaming you :P

They used to be just a specialist for MR2/Celica engines a while back, so can't think why they would have replaced a metal part for a rubber one several times, unless as you said, the junior technician was on the job.

I can't speak from any previous experiences on whether they've improved, but I was definitely happy with the result, the service, and what they carried out. IMO they're good guys. You just had a bit of an unfortunate event :S

Where have you been going instead then for MR2 stuff? Anywhere you're particularly impressed with?
shinny
Posts: 2345
Joined: Mon Nov 27, 2006 4:59 pm
Location: Reading, UK

Re: Boosting Problem

Post by shinny »

Well indeed... When I moved to the area I was very happy to be moving close to a well known MR2 specialist (they used to be called 3S service center and their username on here still matches that). I gave them the benefit of the doubt on the first one of two issues but the issues kept happening so I now wouldn't let them touch my car with a barge pole.

Some people must like them or they wouldn't stay in business. But for whatever reason I repeatedly got pretty poor quality work from them and given my experience I would never recommend them to anyone. Clearly not every task they do has issues, but even setting aside the smaller issues the success rate seemed to be very low given their supposed status as a specialist. Your mileage may vary.
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