RBSX wrote:
Pink; thats some good stuff there as well
But T28s are flipin rare
But you right i should rather just go with a bigger turbo,
but the thing is im looking for cheap powerDoes the RB20det have a T28..does anyone know
Not to rare.... I maybe able to source you one... getting myself one in a month or so....
rather get a turbo that can handle the work that you intend to make it do.
and they not so rare - look in the back of a speed and sound and you can get a new T28 from mr turbo for just over 3 grand!!!
The highest boost for a normal T28 jernal bearing turbo is also estimated at 0.9......
Sorry this is incorrect information, because you are pushing you turbo beyond its capability you will cause the shaft to “over-spin” to produce the required boost end of story the slightest stress fracture in the metal could cause the Impeller to explode also you could possibly twist the main shaft forcing the wheels into the housings
This happens to turbos with the non metal exuast wheel for faster spool up, this sort is rarely found in SA, our turbos are mostly fitted with aluminum and light metal exuast wheels...why...we are cheap...and as hopefully most people know....aluminum does not shatter so easily...it bends rather well if it has to but shattering................... 🙄
Ceramic wheels....thats another thing....
Ceramic turbines are a big help in this direction. Unfortunately, their relative fragility limits the maximum boost they can supply
So if you have ceramic wheels in your turbo, which I highly doubt, boosting to high will be bad.....something might shatter, even on normal boost if the shaft bends under load.
This happens to turbos with the non metal exuast wheel for faster spool up, this sort is rarely found in SA, our turbos are mostly fitted with aluminum and light metal exuast wheels...why...we are cheap...and as hopefully most people know....aluminum does not shatter so easily...it bends rather well if it has to but shattering...................
Ceramic wheels....thats another thing....
First off your only taking about the exhaust wheel where as the intake will be exposed to the same force’s when over-spin and this is just a hope and a prayer tactic as any metal will fail catastrophically when exposed to forces exceeding its intended range of operation like when over-spinning also wheels are not examined or X-rayed for stress fractures at every rebuild. Also almost every turbo will over spin if the intended boost is beyond its capabilities made worse by the fact that the CA18DET has a small exhaust housing
The highest boost for a normal T28 jernal bearing turbo is also estimated at 0.9......
Sorry I also need to correct this; it’s all dependent on wheel trim angles and inducer housing sizes also I don’t know where this is coming from based on the fact that as you said yourself you boosted a T25 to 1 bar Also the most IMPORTANT thing about a turbo is flow rate look at the flow maps to determine the operational range
First off your only taking about the exhaust wheel where as the intake will be exposed to the same force’s when over-spin and this is just a hope and a prayer tactic as any metal will fail catastrophically when exposed to forces exceeding its intended range of operation like when over-spinning also wheels are not examined or X-rayed for stress fractures at every rebuild. Also almost every turbo will over spin if the intended boost is beyond its capabilities made worse by the fact that the CA18DET has a small exhaust housing
Exactly....I am only talking about the exhaust wheel, all compressor wheels are made from aluminum, I have never heard of a copressor wheel shattering whithout something hard going through it and causing the shatter, I have seen many bent blades because off bearing falior and bent shafts.
Sorry I also need to correct this; it’s all dependent on wheel trim angles and inducer housing sizes also I don’t know where this is coming from based on the fact that as you said yourself you boosted a T25 to 1 bar Also the most IMPORTANT thing about a turbo is flow rate look at the flow maps to determine the operational range
MR Bunny......Obviously if you use bigger parts the revs will be less causing less stress, are we talking about standard turbos or modded ones..........will the angle slow down the normal wheel sizes rotation by so much that it does not over spin...I think not, if you want 1 bar from a T25 or T28( not a modded turbo)....where the internals are the same by the way....the housings are bigger as well as the compressor wheel, but the exhaust wheel is the same size.....(yes, I confermed this with my own eyes when I built my T25 onto T28 housings) it will still over spin the revelutions it is made for.
As I said, I'd say 0.8 is safe still, I boosted 1 bar....and more by the way, my turbo did not fail but I still don't reccomend it, I reccomended 0.8 as a relieble boost pressure.
Before you quote me let me do it....I like this game 😂
On the stock turbo I would say 0.8 is the maximum you will be able to go reliebly
Looking forward too the next set of quotes 😉
O.....and you quoted me
The highest boost for a normal T28 jernal bearing turbo is also estimated at 0.9......
and asked where I got this from....
I got this from a tuner when he dynad my car with the T28 and from the Turbo place that reconned my turbo because of shaft play due to me boosting 1.4 bar for a while before coming to my senses and guess what, my compressor wheel did not shatter.....
Just to stress....I do not recommend more that 0.8 on a STOCK T25 and not more than 0.9 on a STOCK T28, not because I or a few tuners or the net or turbo shops say so but because that is my opinion....just that....opinion.....get it.
OPINION
😂 😂 😂
😂 😂 😂 😂
My point is and I have gone "Way" off topic with this one (Sorry RBSX and the rest of the club), Is "NO" don’t push the stock turbo past 0,8 and even then your on the envelope of the flow chart just invest in a bigger more efficient turbo you will not regret it as the biggest limiting factor in most cases especially the CA18DET’s case is the turbo.
Sorry Draco, not all T28’s are the same and if you’re happy with the fact that the internals are the same and that the expeller/impeller is the same then fine, I am going to back away from this “e-tug Fight” becuase this is just pathetic
I'm seeing a pattern here, it seems that as soon as an SX owner sells their SX and they become exSX owners, they start correcting current SX owners about their SX'es..... Waaay funny, isnt it 😛 😛 😛
Just kidding Draco, you know what I mean 😛, I've been there!
True.....not all T28's are the same, ballbearing and specialized turbos is not what I spoke about, other makes have also got other sizes and so forth, the standerd Garret T28 and T25 turbos that came out on the cars is what I referred to.
I would just like to make something clear, when I said the internals, I meant the size of the shaft and exhaust wheel with the middle part housing the jernals and "internals", with other words, I took a T28, stripped the exhaust housing and compressor housing and fitted the housings straight onto my T25's middel body, I had already upgraded the compressor wheel to a T28, the exhaust wheel and miidle housing was the same size.
You said it....it's pathetic. That is one thing I agree with you on. 😂
Sorry to everybody that had to endure this.
😂 Ya Sokar.... it seems thats the case hey 😂 I guess it is safe to say we are no experts on all the detailes but we have been there and done that....welll um I guess I could say that, you have a sx again and will be rebuilding it plenty..... again:lol:
RBSX....if you still bothering to read this pathetic stuff, if you decide to use a standard Garret T25 or T28 made in the old days specs and you want to boost 1 bar, at least ask the turbo experts to ad a 360 digree thrust bearing when you rebuild the turbo.....it helps to prolong it's life.
[quote="Draco"][quote]
Exactly....I am only talking about the exhaust wheel, all compressor wheels are made from aluminum, I have never heard of a copressor wheel shattering whithout something hard going through it and causing the shatter, I have seen many bent blades because off bearing falior and bent shafts.
Aluminium? The blades are made of aluminium?Holy shit.The blades are NOT made of aluminium!!!!!
Ok,not trying to be an ass,but i mean really! 😀
The rest is correct. Study the compressor maps of the turbo in question to see it you will be operating it in it`s efficiency range. Boosting the stock T25 to 14 PSI is just stupid. All heat and no gain.
karis
Just some backup for the pathetic comments that I posted, something from GOOGLE....
Compressor wheel breakage also can occur from foreign object material although not as frequently as turbine wheel damage. Sometimes pieces of the air cleaner will break loose and go through the compressor. There also have been instances where hose connections fail and pieces of rubber or wire reinforcing from the hose get into the compressor wheel. Again, carelessness in allowing nuts, bolts, washers, rocks, rags and even screwdrivers to get into the intake systems will cause compressor wheel failures.
from http://zhome.com/ZCMnL/PICS/turboChargerBasics/turboChargerBasics.html
So I used GOOGLE again for this
Modern commercial vehicle turbochargers are subject to very high loads due to the wide range of applications they are used in. In many cases where there are extreme loads, a compressor impeller made of an aluminum alloy determines the service life of the turbocharger. In particular, material fatigue can result from extreme loads, especially when the loads are cyclical loads occurring at low frequencies. This phenomena is also known as low cycle fatigue (LCF).
from http://www.turbos.bwauto.com/products/titaniumCompressorImpellers.aspx
So ya....um I pulled it out of my ass.....Thanks to google for backing up what I sucked out of my thum.
Wheres the flow map Draco.
He said
The rest is correct. Study the compressor maps of the turbo in question to see it you will be operating it in it`s efficiency range. Boosting the stock T25 to 14 PSI is just stupid. All heat and no gain
I don't know what you are carrying on about.....the first quote I made was in response to your earlier remarks on compressor wheels shattering.....
The second quote was in his response saying the wheels are not made of aluminum, the compressor wheel and blades from the standard garret T25 and T28 are made from aluminum unless modded otherwise. Please.... I am not speaking about other turbos made 10 years later or the ones built now.....
I don't have the flow chart....I don't need it to say what I said earlier,I never recommended that the T25 can boost or must boost 14psi reliebly, I did boost that but I do not recommend it as I said before. I recommended 0.8(12 psi) as the most it can relieble...and then I did not say that is right and that is the way it is....that was my opinion.
Come on....what do you not get or understand.....?
Lets smile on this pathetic thread 😂 😂 😂 theres mine 😛
I have no Idea what you talking about ......
....me neither..... 😉 😛
LOL...
Im just getting you worked up because its damn funny to read..
OOOOOOO what a comeback....I know many people falling back on that when they have been proved wrong.... 😂
WHAT THE HECK HAS BEEN going on,,,,,, shit guys dont kill each other here.
Anyway shot for the help
So does anyone know the spec on a Rb20 and 25 DET
Sign in to reply.