glanza external wastegate questions help please

[gkld]

hey there,

i have a totally stock 1997 glanza v 4efte, it has a pod air filter and aftermarket bov as-well as the boost solenoid bypass which allows me to run 11.6psi boost. it has the standard air track, factory manifold and downpipe with cat and factory exhaust.

im going to throw on a new HDI front mount intercooler kit and i want to put a 38mm wastegate plus screamer pipe to be run from the spring (no electric boost controller) so im going to weld it onto my standard mani and keep the factory downpipe with the cat in it and factory exhaust.
your are probably wondering why the standard exhaust and wastegate with screamer? i want to keep it quiet at low revs and slow driving and keep a sleeper look to it and keep my costs down for now.

my question is:
what happens to the boost solenoid? do i leave it there with the boost solenoid bypass? or do i put it back to normal (when ive got the external on with a 11.6psi spring) or do i remove the boost solenoid?
got any pictures of this if there's anything specific i need to change?

as the car is at the moment it runs 11.6psi (solenoid bypass) with factory actuator so if i chuck a 38mm external(obviously id have to weld the internal w/gate flap shut) with a 11.6psi spring in it will it hold boost at 11.6psi when i floor it or will there be a little bit more boost like 11.8 or 12psi for a few seconds then back down to 11.6psi since im not using a electric boost controller?

heres a link to my facebook page where you can see some pictures of my engine bay as im not familiar with posting pictures on the site.

https://www.facebook.com/profile.php?id=100002431257194

you might have to add me to see my pics sorry

so basically i just need to know any info or experiences or opinions whether using a external wastegate with a 11.6psi spring and NO electric boost controller will cause me to go over 11.6psi when flooring it thus causing fuel cut.

also as an alternative to going external, what if i ported my internal wastegate and welded a screamer pipe onto my factory downpipe and cat? would it be loud?

ive read the threads and gone through tonnes of posts about glanzas and ct9s with externals but cant seem to get a direct answer to my question, hope you guys can help me
any help would be greatly appreciated
cheers

 

[CharmanT]

as the wastegate will help to significantly reduce external is the turbo lag today. For me it is the surest way to maintain a stable boost without boost spikes.
And as the wastegate spring brings different psi there You can do the calculation as it is what you need, without ebc or bcm

 

[gkld]

ok, settled, so if i use a 11.6psi spring i wont get boost spike and i will get stable boost at 11.6psi even if i dont use a electric boost controller.
still,
what happens to the boost solenoid? do i leave it there with the boost solenoid bypass? or do i put it back to normal (when ive got the external on with a 11.6psi spring) or do i remove the boost solenoid?
also
also as an alternative to going external, what if i ported my internal wastegate and welded a screamer pipe onto my factory downpipe and cat? would it be loud?
cheers

 

[CharmanT]

to me that you have to back like she did before, with external wastegate turbo seal the hot side and you have to make a flange to exhaust your manifull to place the external wastegate and boost their spirals define how you will have

 

[gkld]

you are making no sense mate

 

[Texx]

You won't need the stock boost solenoid, you can either loop the hoses or remove it completely.

Using a 0.6 or 0.7 bar spring and a boost controller would work much better than running the ex gate with just a 0.8 bar spring to control maximum boost. You may get a slight boost spike when using just the spring to control boost, however I wouldn't expect boost to spike high enough above 0.8 bar to worry about fuel cut.

 

[weeJohn]

You are going to have problems welding a steel wastegate flange onto the stock cast mani, if it was a mild steel or stainless mani then no bother, but its harder to weld steel to cast. If it does happen then the spring will hold boost the best and stop overboost altogether, you could put a smaller rated spring in and use the boost solenoid to increase your boost level but it would be less accurate than without.

 

[gkld]

You are going to have problems welding a steel wastegate flange onto the stock cast mani, if it was a mild steel or stainless mani then no bother, but its harder to weld steel to cast. If it does happen then the spring will hold boost the best and stop overboost altogether, you could put a smaller rated spring in and use the boost solenoid to increase your boost level but it would be less accurate than without.

thanks for that!!
also as an alternative to going external, whats your opinion if i ported my internal wastegate and welded a screamer pipe onto my factory downpipe and cat? would it be loud? remember im still using the same factory actuator
cheers

 

[Murray]

The factory downpipe is cast to.

 

[gkld]

well if i can find a cast tube or some steam tube pipe it should stick so what do you think? lol

 

[weeJohn]

I think you would be better spending the money on a decent CT9 tubular manifold first, you can get one with an external wastegate flange on it so you can run one when the rest is sorted out. Then look for a decat and wastegate to link it up after if you dont want to do it all at once.

 

[gkld]

I think you would be better spending the money on a decent CT9 tubular manifold first, you can get one with an external wastegate flange on it so you can run one when the rest is sorted out. Then look for a decat and wastegate to link it up after if you dont want to do it all at once.

i want to keep my costs down for now and just want to start off with this simple setup if its possible.

 

[weeJohn]

Its not impossible mate, might just not be worthwhile but.

 

[hardcoreep]

1: It is possible to weld an external wastegate to a cast factory manifold. Its something we do plenty here in Jamaica. However, the stock 4EFTE manifold is restrictive and using it with and external wastegate is a sure way to kill your car. This is because external wastegates are more accurate because they hold a) a larger volume of exhaust energy and b) don't crack open early like other assisted methods of boost control.

2: You will probably not get boost spikes with a external wastegate, you may have reduced turbo performance because it will vent all the exhaust energy used to drive the turbocharger.

 

[gkld]

1: It is possible to weld an external wastegate to a cast factory manifold. Its something we do plenty here in Jamaica. However, the stock 4EFTE manifold is restrictive and using it with and external wastegate is a sure way to kill your car. This is because external wastegates are more accurate because they hold a) a larger volume of exhaust energy and b) don't crack open early like other assisted methods of boost control.

2: You will probably not get boost spikes with a external wastegate, you may have reduced turbo performance because it will vent all the exhaust energy used to drive the turbocharger.

thanks for that!!
yea i know about the restriction in the 3rd runner and so i have bought a whole set of new gaskets because i was going to port the manifold and the internal wastegate anyways. remember im only doing 11.6psi and its for daily use so not much thrashing so it shouldnt crack a piston or anything...
thanks!!

 

[hardcoreep]

The problem is not the restriction of the 3rd runner, but the lack of volume in the manifold. Your stock boost control system is designed top crack open before hitting target boost. Therefore if you're running 10 PSI the car will start to open the wastegate from 5PSI. External wastegates, based on spring tension, don't do this. They crack open at the specific boost level. Therefore your manifold and turbo will start to contain more heat since a higher volume of exhaust gas will be trapped. That overtime at best can just lead to manifold failure (cracking). At worst a dead engine as the EGTs increase, or the excess volume is forced back into the cylinders. In our local experience using an external wastegate on a stock manifold with a CT9 will shorten the turbochargers life. Boost and power response may vary by wastegate brand and size. I'm sorry I don't have a picture of a local manifold right now.

This is a rough sample of an external wastegate on a cast toyota manifold. In this case they normally use the NA manifold since it has a higher internal volume than the stock.