Rb20 Boost Spiking Kinugawa Td06 Hybrid Performance Manifold

[Tommyd32gtst]

So i got my car back together about two weeks ago, A r32 gtst rb20, got one these hybrid performance manifolds and a kinugawa td-06 20g 8cm with a genuine tial 38mm wastegate, had to weld up about 5 holes in the collector and get both flanges machined due to serious warpage which cost me around $150 trade pricing, heat wrapped it all and fitted up ok.. put a 1 bar spring in the gate and took it for a drive waste gate didnt open until 17psi and kept creeping up past 23psi before i backed off. pulled gate off and changed to 7psi spring took for a drive gate opened at 10psi then creeped slowly up to 15 then flew round to 23 at high revs, so then i thought my gate might be faulty. so i pulled another tial 38mm gate off my mates fj20 and fitted still the same trouble. I am running 6mm id reference line from inlet manifold, It would seem the manifold doesnt have the ability to control boost pressure,

Is any else running the same setup with good results? not sure what else to do

[Kane_R32]

Where is the gate getting pressure from? What gauge are you using and where is it seeing its boost source from?

What exhaust do you have?

[Tommyd32gtst]

There's two ports in the inlet manifold on the cabin side of the throttle body, and the guage port is on the cabin side of the inlet manifold, I know it's not controlling bOost because the gate is on a screamer pipe Which Opens and then still gains up to 15 psi

[Tommyd32gtst]

Exhaust is home made 3 inch from turbo to cannon no muffler no cat

[scotty nm35]

38mm gate is pretty small, I would have thought a 45mm would have been a better size, especially if the wastegate feeds off the manifold at a weird angle. Have you got any pictures?

[Tommyd32gtst]

The waste gate piping is 38 mm, I was led to believe

The 38 mm gate was good if you wanted to run high boost levels, I want to run around 17-20 psi but want it to stay at that ha, would a 45mm gate be any good if it's 38mm piping? pics of the gate pipe out the manifold?

[slippylotion]

I contacted Tial about using either the 38 or 44 gate for my SR running 18-20psi on a tdo6sl2-20g T3 and they said the 38 was perfect but it needs priority on the manifold. I assume your rb20 would be nearly the same requirements.

Bang a pic up of the wastegate location on te manifold. I bet it also has a length of pipe moving the gate too far away from the manifold rather than keeping it short.

[Tommyd32gtst]

Yes it does have a length of pipe and "reverse" angle flow from the manifold but no1 else said they were bad for boost control I will sort a pic

[slippylotion]

There's your problem then.

[GTScotT]

your the first to report control issues with those manifolds, a few ppl have them now. many of the big name manifolds have LONG gate tubes also, so i dont think thats the issue.

now you said you put the 38mm gate on your mates FJ20 and it still had the same problem, is that right? if thats the case have you tried putting your mates gate on your manifold?

i mean if u put the same gate on a mates car and it still had a problem dont you think something is up with the gate? seems logical.

[slippylotion]

Na he said he fitted his mates gate to his manifold and still the same problem.

[Tommyd32gtst]

I took another tial 38mm wastegate that works perfect on my mates fj20 on a home made manfold with a 4mm internal reference line from the inlet manifold after the trottle body and fitted to my car and I still had boost control issues thus ruling out a faulty/fake wastegate

[slippylotion]

Hang on your mate take the pressure source from the plenum side of the throttle body? Should only see pressure to the gate not vacuum as well.

[GTScotT]

ah ok.

try move your reference feed to just after the turbo or even the comp housing.

if that doesnt change anything then id start looking at the manifold.

[Tommyd32gtst]

It works fine on my mates fj after the throttle body but I will give anything a try

[Roy]

Loads of people have problems with manifolds where they have to weld their own wastegate at the collector, even 6boost etc have the problem. The best bet is to shorten the length of pipe between the collector and the gate as much as possible.

If you weld it like below you should be well positioned to have good boost control

[scotty nm35]

Nice clean setup there, good wastegate flow. Get some boost pressure on the top of that gate next Roy... What springs are you running?

[Tommyd32gtst]

Yes I think everyone is a bit jealous of Roys 32, i stole his cooler to intake pipe design for mine and whipped one up,

[Roy]

Nice clean setup there, good wastegate flow. Get some boost pressure on the top of that gate next Roy... What springs are you running?

Why is that? I dont run a boost controller so you only need to connect the boost pressure source to the bottom of the gate. Std prings whatever they are.... i just run a very crude bleed setup whilst I play with power and different turbos, fuels and tunes

And Tommyd32gtst, my thing is a pretty basic setup...have had the car for 13 years so had enough goes at getting it right and my god it is still way to rough for my liking in areas.

[34GeeTeeTee]

My gate is off a 6boost in similar position.... Isn't it smaller boost bigger gate? Bigger boost smaller gate? I may have it backwards but I chose a 44mm for 20psi.... Edumacate me