SR20DE+T Silvia leaves me STUMPED on the Dyno..

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Jimmy Oakes
PMB 169
61 N. Plains Industrial Rd.
Wallingford, CT 06492

[jimshort]

19:45 Jimmy's fatherly concern for Ant is what makes Jimmy such a stand up man. The little things I notice bout each of you lmao. All amazing people stay safe out there and warm.

[leeshah]

Boost wastegate in exhaust housing to encourage the gases to go through the gate rather than straight through the turbine 👍

[tspans]

Had the same issue on my sr20det, I was hitting 15+ on a 6lbs internal gate. Ported the wastegate hole but that only kept it down 1-2 psi. Swapping to external gate was the only thing that fixed my issue. But if you got a bigger turbo exhaust housing laying around the shop that might help also before going external. SR IS GOOD!

[leonrixon]

Check to make sure the actual physical flapper on the gate is moving when open. Then you can rule out the turbo being the issue, plenty of people here in Aus have turbo na sr’s and have no issues with the stock ignition. But also doesn’t mean that yours is good! Just do smart coils and make sure the flapper is opening.

[midnightmenace]

I will say step by step diagnosis with a great explanation of each consideration is absolutely going to help so manny backyard bandits iron out their builds and I love to see it!

[ItsJoshN]

I love these videos/builds. Its probably boring to some but its a great experience to follow along and learn and read the comments and see everyone working together to figure out the issue.

[ashaik]

Anyone buy yugioh cards from jimmy shops and they come with random merch? I think it’s pretty cool

[baltazardT]

Here's the thing with high compression engines and small frame turbos. The higher compression forces so much air through the exhaust manifold that the simple internal wastegate with its small dimensions cannot keep up no matter what. If you notice all of the big bad ass cars that are high compression running small or medium turbos have multiple external waste Gates on the system in the highest flowing areas of their exhaust manifolds. Some even have to go to the extreme of putting a wastegate on each exhaust runner just to manage their boost when they're compression is high. The trick for running a high compression engine with a turbo is to use a larger turbo, the larger turbo will negate the low end torque that destroys the engines and will stop the boost spiking as it will allow the boost to come in later in the RPM more controllable.

[NoClassic]

I wonder if the flapper is getting stuck or is loose on the arm? Is the initial downpipe elbow at all restricting the gate flow? Also not a bad idea to replace the distributor cap and rotor.

[NicoSchrauwen]

Thanks for showing this Jimbo, actually learned a lot about turbos today.

[logan]

This is a similar issue that happens with turbo ii rx7’s. When you increase boost, you need to port the exhaust manifold so that the internal wastegate can operate more efficiently. This will eliminate the boost creep. Not sure if it’s the same with sr20 manifolds as well but it’s worth a look

[Broyourenglishisgood]

Jimmy got Brian back with the 2 step 😂 Donnie almost dying from Brian’s 2step from his mk2 is still my favorite Clip of all time

[mjc]

If you attach the ramps to the dyno with a hinge you can mount scissor jacks to the ramps to make it easier to level the cars. If you get the type with the bolt head you can just run them up and down with an impact.

[Trevor]

My first engine was a s14 sr20de in a s13. Awesome seeing what these things can do. I was never very confident in it so I swapped to det.

[nickbrooks]

The lever that connect to the flap is broken so it’s staying closed the whole time. Hence building all the boost no matter what position you try.
Hope that helps and keep up the good works guys. Killer videos!!! A cool obs Chevy regular cab short box build with a turbo LS would be sick to see and something a little different you can put your twist on.

[Garage]

According to some sources I can find, the rods and pistons are actually the same. The head combustion chamber is what makes the compression ratio different. The bottom end can generally handle quite a bit, but obviously you have to avoid knock.

[DaltonBalkwill]

Brian looking stylish today with those glasses 🤘🏻😂

[TalkTime]

I always put the wastegate on the exhaust housing, 44-60mm gates never had boost creep like this, but yes higher compression is def enough on a 4cylinder, they want to breathe so you got to give them bugger manifolds downpipes etc for them not to want to boost creep

[closewatermelon]

Plot twist, What Jimmy thinks is open is actually closed

[chrisdines]

Has the wastegate seized shut and the lever broken off so it moves ? That’s the only thing I can think of