I picked up a JWT 530BB twin turbo kit for my G35 and I'd like to convert the internal wastegate setup on the stock turbos to externals with 40mm Synapse Engineering synchronic units. Was wondering if anyone has done something like this before and what would be required

thanks in advance guys

 

yes it can be done. you'd have to remove the wg actuator and weld the flapper door shut and then create a hole on the manifold before the turbo to tap in to and weld a flange on for an external wastegate.

however, i propose a new question; why do you feel its necessary?

 

Also you might want to consider a different wastegate, those Synapse wastegates are huge though they look pretty cool.

 

These turbos have some creep / instability due to restrictive internal wastegates and the fact they are a bit undersized for the VQ. External WG's will resolve much of that.

 

Thanks I was hoping someone would be able to explain my reason for this in a technical way we could all understand without me sounding like an idiot

 

thanks for the heads up. I guess I'll have to see if its gonna fit. I really wanna use this instead of any of the others out there based on the features and quality of it

 

how different can wastegates be based on features? I mean, boost=specific level=open

I'm not seeing them being that much different. So many people are tried and true with the way smaller TiAl wastegates it would be easier to do that if you have trouble fitting a huge wastegate in the tiny amount of space we have under the car.

i def. would use external wastegates though. Good decision.

 

The synapse wastegate allows you to adjust the preload

 

boost controller is so much easier to adjust than lifting a car, climbing under it and trying to estimate how much preload you need then doing that process over and over until it's set right.

Plus it's 100$ more than a tial. I'd rather just get the tial with an easy to adjust electronic boost controller.

 

easy to set the preload while its on the lift prior to getting it tuned. Once its set I won't be tempted to play with it and grenade my motor using an EBC like so many others have done in the past. I'd rather set it and forget it

 

How do you know it will be set to the correct psi on the first try? It's annoying to have to climb under the car during a dyno session to change something with the wastegate if it's not set at the proper pressure.

 

You might try porting the stock WG's in the housings... pretty common mod on old stock turbo cars running increased boost (Subaru, Mitsu etc). Obviously don't make the opening bigger than the flapper but if the creep is minor you might be able to keep them internally gated.

 

this is a great idea! I never thought of this (since i deal with all externally gated systems) but my room mate has an internal gate and we were going to convert it. I'll try this first.

where the F is that "thanks" button on here cause you deserve some thanks for this!

 

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Thanks

I do porting on heads so i'll do it with similar chambfer that i use for heads to help transition flow and reduce turbulance.

 

not even gonna bother tampering with the turbos at this point. I'll run the kit the way it is or sell it. I'd rather have the twin turbo kit Sasha is developing and just buy one brand new from him when its ready this winter with the biggest pair of turbos I can shoehorn into the bottom of the car and be done with it. Build the motor to handle it and just enjoy whatever power I get out of it that way