max boost for tdo5h

[xjokux]

I just finished my vr4 conversion and wondering what's the max boost for it since i'm all new to this now

It's a stock j-spec vr4 import motor.

stock j-spec dual ecu
stock dump pipe and manifold
450cc injectors
dual cyclone inlet
2.5" exahaust


thanks
johno

 

[GSRSOL]

which Td05 is it?

 

[xjokux]

im not too sure lol It came off 89-90 vr4 if that helps?

I thought i took a pic of the code number on the turbo but couldn't find it

 

[brisvr4]

If it is the stock 14b then I would stick to a max of 15psi.
Even that would be pushing it.

 

[Liberoz]

on a 14b unless it was chipped with supporting mods!
I wouldn't be pushing anything past 15 thats for sure.

 

[xjokux]

atm its going at 10ish psi

i guess i'll leave it at that till i get bigger turbo, i'll have a look at the code tomorrow to found what it is.
any suggestion bigger turbo?

what are the differences between 16g and 20g? and would i have to do supporting mods as well?

 

[brisvr4]

Yes, you will need supporting mods or a new motor!
I would convert the ecu to a single board and chip it. That way you should be able to at least log it and keep an eye on things.
I would then upgrade the injectors and fuel pump followed by the fuel pressure reg and exhaust etc etc etc, the list goes on forever!

 

[Liberoz]

That's when you need another job when the bug bites just to keep you rides Modding fix satisfied

 

[xjokux]

Yes, you will need supporting mods or a new motor!
I would convert the ecu to a single board and chip it. That way you should be able to at least log it and keep an eye on things.
I would then upgrade the injectors and fuel pump followed by the fuel pressure reg and exhaust etc etc etc, the list goes on forever!

I've got a whinebro pump and sard regulator so far, next will be a 3" exhaust

 

[xjokux]

I'm having problem increasing the boost. I can only adjust between 1-7psi. The lower I go better response at after 3k as to higher starts boosting at 4k.

I ended up putting the stock controller because it gives me 8psi with a gradually boost after 3.5k

 

[iluszn]

Stock 14b should be giving you full boost at 3500rpm.. 1 or 10psi.. You have a restriction somewhere..

 

[xjokux]

any idea what it could be?

 

[brisvr4]

I would say it is one of a few things.
1. Boost leak
2. Cracked manifold or exhaust housing.
3. Stuffed manifold to turbo gasket.

My 14b used to actually hit full boost closer to 3200.

 

[xjokux]

I just had a 3" exhaust put on today. Problem solved!

 

[CLuTZ]

How come you have an adjustible FPR? what was wrong with the stock one?

 

[mattrat]

hmm, i have a 2 1/4 exhaust on my ggsr off a 2.5 inch front pipe with a small 16g and i make about 13 psi spiked to around 14/15 in 3rd gear at about 3-3.5k rpm.. and my exhaust is a restriction, it couldnt ahve just been your zorst, 2.5 inch is decent enough isnt it..

 

[brisvr4]

Clogged cat?

 

[xjokux]

How come you have an adjustible FPR? what was wrong with the stock one?

it was running rich with whine bro pump. well i was told to get one due to it will run rich.

 

[xjokux]

well.. when i did the conversion, my existing exhaust wouldn't fit. I had to modify it, I really didn't have much piping around besides a stock cb lancer exhaust Hacked up few pieces just to join from cat to dump pipe.

I think that pipe was like 1.75 for a stock cb exhaust. Now with a 2.5" then 3" mandrel to the back.

 

[xjokux]

Clogged cat?

I also believe my was clogged or too small. Cause more than a few times, the exhaust would be red as if I had red neons underneath