5 GT Turbo Low Boost (TD04L modified)

[itzik]

Hi,

i have a TDO4L (from a WRX) in my GT, i am not able to raise the boost pressure more than a 0.5bar, i did a boost test leak and only found a leak from the accelerator pump on the carburator (i ordered a Webcon kit), could this be the reason?

thank you,

 

[Brigsy]

The acc pump always leaks boost, you do not need that pipe on so block it off. Your problem is possibly actuator related, try a bleed off on the actuator line to see if you can get more boost pressure

 

[Adey]

Have the same turbo in my garage. Always wondered what it would be like on the 5....

 

[itzik]

Hi Brigsy,
I have tried disconnecting the pipe to the Wastgate actuator and set it on fully closed just for a test, it didn't solve the problem, maybe the turbo is to big? It's relatively small turbo...

 

[andybond]

A TD04L is from a Subaru , correct ?

If it is , I think its far , far too big for the little c1j. Going to take space and beyond revs to get it moving

 

[itzik]

A TD04L is from a Subaru , correct ?

If it is , I think its far , far too big for the little c1j. Going to take space and beyond revs to get it moving

I thought so, i guess i should find hybrid t25.

Thank you,

 

[andybond]

You could run a larger t28 but as long as the hot side in no bigger really that a .63, I would even look for a .55 if you could.

@Brigsy what turbo do you run ?

 

[Adey]

td04 is a small one off a scooby, will do 280bhp at a big push, works well on the 1.6 mx5s too till about 250, its comparable to a t28, infact i think the t28 are bigger than it though i could be wrong. Id check the wastegate isnt fooked, if its adjustable tighten it up before condemning it

 

[itzik]

td04 is a small one off a scooby, will do 280bhp at a big push, works well on the 1.6 mx5s too till about 250, its comparable to a t28, infact i think the t28 are bigger than it though i could be wrong. Id check the wastegate isnt fooked, if its adjustable tighten it up before condemning it

I tried to tighten it all the way, it seams like the c1j can't get it to work, i get a 0.5bar in 5000 rpm.

 

[DaveL485]

I tried to tighten it all the way, it seams like the c1j can't get it to work, i get a 0.5bar in 5000 rpm.

What exhaust housing is it? Could be too big?

 

[itzik]

What exhaust housing is it? Could be too big?

Actually it's a big exhaust housing 3' down pipe connected to a stock exhaust, with a middle and back muffler, maybe the exhaust gases are too restricted? It's a 3' going down to 2.25' and under the car 2'.

 

[Adey]

the title says modified, is that mean you have a hybrid tdo4?

 

[itzik]

Sorry,
I meant the car is modified, the turbo is not modified, it's the same as on the subaru WRX.

 

[Brigsy]

Try wiring the wastegate shut solid to see if it makes boost to rule out the actuator. The original actuator will no doubt be very weak. Mine is a gt2560r .64 and i make loads of boost so this should work ok

 

[itzik]

Try wiring the wastegate shut solid to see if it makes boost to rule out the actuator. The original actuator will no doubt be very weak. Mine is a gt2560r .64 and i make loads of boost so this should work ok

I replaced my blow off valve and i wired my wastegate shut solid, it helped a bit now i am getting 0.65 bar in 4500 rpm, still low with a lot of lag, the accelerator pump on the carb is leaking, could this be the reason?

 

[Brigsy]

Block the pipe off to the acc pump, you do not need it. Have you got an afr gauge hooked up??

 

[itzik]

Block the pipe off to the acc pump, you do not need it. Have you got an afr gauge hooked up??

Hi, no just an egt gauge.

Will try it thank you.

 

[DaveL485]

Sounds like the turbine housing AR is too low for the engine.

 

[Brigsy]

What are the specs for this turbo ? Trim etc ?

 

[itzik]

I need to check, i only know it's a standard tdo4l-13g from a subaru wrx.