Gen 4 w/ Precision 5558 - MR2 Owners Club Message Board
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post #1 of 29 (permalink) Old July 24th, 2014, 19:19 Thread Starter
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Gen 4 w/ Precision 5558

Just thought I'd post this for all Gen 4 owners to see.

Mods:
Gen 4 3SGTE (Installed by Prime Performance)
Intake
Intercooler
3"Downpipe
TCS 85mm exhaust
Walbro 255 fuel pump
EBC @ 16PSI
Precision 5558 turbo with Tial Wastegate

Air/Fuel ratios looked great, only hitting 11.05 while under full throttle @ 16PSI. Full boost by 4500rpm, not sure how this stacks up with other turbos, so if anyone with experience can comment, it would be appreciated. This pull was done on a 93 degree day with 22% humidity. Overall, I am happy with the numbers and the new turbo.

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post #2 of 29 (permalink) Old July 24th, 2014, 19:31
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Looks good. How does it drive? What size turbine housing are you running? Alot depends on your goals for the turbo. Its pretty oversized for the current boost you're running. If you were after 350whp then a smaller faster spooling turbo would be better. If 500whp is your goal then I think you picked the right turbo.

...why not?
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post #3 of 29 (permalink) Old July 24th, 2014, 21:28 Thread Starter
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I bought it for future goals. I wanted something I could pick up a decent amount of power while still on stock fuel and ECU.

Drives very well, I even get better gas mileage because of the slight increase in lag.
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post #4 of 29 (permalink) Old July 25th, 2014, 03:08
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Is your fuel system stock?
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post #5 of 29 (permalink) Old July 25th, 2014, 06:50
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Like said above for a future goal of 500whp+ that is a good turbo and dyno is pretty good.

If on the other hand it would be staying at this power level I was spooling 700rpm faster and making almost the same power with my S252 on a 3rd gen.

Very smooth powerband, must be that 4th gen electronics.

1993 MR2 turbo build TBD....
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I am still alive, just busy with life. Still got the MR2 sitting the in driveway. Someday it will be back on the road. When that will be only God knows. It will be really fast when it is though.
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post #6 of 29 (permalink) Old July 25th, 2014, 07:13 Thread Starter
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Other than fuel pump, fuel system is stock.
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post #7 of 29 (permalink) Old July 25th, 2014, 08:30
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I would go down a pound or two on the boost to give you some injector room.... But it looks good though for pretty much a stock deal.

Angel
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post #8 of 29 (permalink) Old July 25th, 2014, 08:49
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Quote:
Originally Posted by JDM SNUKUMZ View Post
I would go down a pound or two on the boost to give you some injector room.... But it looks good though for pretty much a stock deal.

Angel
Nah, he is fine. I ran my car at that power level for a year without a single issue. Fuel cut kicks in before you can really outpace the fuel system.

1993 MR2 turbo build TBD....
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post #9 of 29 (permalink) Old July 25th, 2014, 09:19 Thread Starter
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I am under the impression 11.5 AFRs is about the extent you want to push it. At 11.05, I feel pretty safe.
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post #10 of 29 (permalink) Old July 25th, 2014, 10:36
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I am under the impression 11.5 AFRs is about the extent you want to push it. At 11.05, I feel pretty safe.
Correct, even up to 12.0 is not bad but I would not want to run it there all the time. You have enough wiggle room that should something happen and you overboost the fuel cut should keep any damage at bay.

1993 MR2 turbo build TBD....
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post #11 of 29 (permalink) Old July 25th, 2014, 11:03 Thread Starter
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Texas, my hose came off the bottom port of my wastegate yesterday and I over boosted into fuel cut. But why? Shouldn't it have only boosted at the wastegate spring pressure?
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post #12 of 29 (permalink) Old July 25th, 2014, 11:06
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Texas, my hose came off the bottom port of my wastegate yesterday and I over boosted into fuel cut. But why? Shouldn't it have only boosted at the wastegate spring pressure?
Without the boost line in place the wastegate will in theory never open. In the real world they are not 100% sealed though so they do open eventually.

1993 MR2 turbo build TBD....
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post #13 of 29 (permalink) Old July 25th, 2014, 11:17
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Originally Posted by Texas_Ace View Post
Without the boost line in place the wastegate will in theory never open. In the real world they are not 100% sealed though so they do open eventually.
They will still open if you surpassed the spring pressure in the wastegate.

But even then I dont trust the fuel cut to always be there though.

Angel
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post #14 of 29 (permalink) Old July 25th, 2014, 11:47 Thread Starter
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That's what I thought, but it didnt. Hit fuel cut.
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post #15 of 29 (permalink) Old July 25th, 2014, 13:46
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Quote:
Originally Posted by JDM SNUKUMZ View Post
They will still open if you surpassed the spring pressure in the wastegate.
l
incorrect. how will it know what boost pressure it is, exhaust gas alone will not push open the wastegate. Thats not how a wastegate works.

boost reference pushes on the diaphragm which compresses the spring, without a boost reference the spring will never compress by exhaust gas pressure alone. therefor the wastegate will stay shut, causing the turbo to boost until boostcut/fuelcut.


Last edited by turbodude; July 25th, 2014 at 13:49.
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post #16 of 29 (permalink) Old July 25th, 2014, 20:49
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If there is a high exhaust manifold pressure, yes, the wastegate can open even without any boost reference hose.

If the srping pressure is pretty low and the turbine housing is tiny (more exhaust pressure), then this case can happen quite easily.

This is why wastegates have a top port. This port is used add pressure to the already installed spring so that the wastegate can fight the exhaust pressure that act against the valve seat. You usually use the top port when you are running high boost pressure and low spring pressure with a small turbo.

Sam
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post #17 of 29 (permalink) Old July 26th, 2014, 02:23
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It can, but unlikely
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post #18 of 29 (permalink) Old July 26th, 2014, 11:39
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I know every time I had a wastegate line come off my boost would spike to fuel cut without fail. Be it the stock 20b or the S252.

1993 MR2 turbo build TBD....
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post #19 of 29 (permalink) Old August 14th, 2014, 05:00
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That's a pretty nice graph.
[email protected] RPM, torque isn't dropping off fast after 6500 RPM, and room to grow.
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post #20 of 29 (permalink) Old August 14th, 2014, 08:29
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Pretty awesome results for simply slapping on a turbo kit. The Gen4 continues to impress.
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