2.4 6 cylinder has poor flowing heads. Pushrod engine.
Read an article about surge.
https://blog.edgeautosport.com/when-is-a-turbo-too-big
I thought it happens BEFORE the turbo starts putting out boost.(not sure about that even being a newbe)
Sounds like it might happen during the whole rpm range of the turbo operation.
When you use a too big turbo.
In article he was saying there was TOO MUCH air and the engine wouldn't take it. That it had a surge condition he could see
on a MAF reading.
Anybody clear this up?
Do you have a compressor map for the turbo you're looking at? What engine?
You should have no problem with a GT35 on a 2.4L. What A/R housing? Something like a .64 should have pretty nice spool, .86 if you want more top end but it will be laggy.
I don't agree at all with the article. It sound's like either the wastegate was too small or had too soft of a spring. And it looks like they had way too big of an exhaust housing on the turbo. So yeah, it was a bad combination but "more air than the engine could take in" , no.
Surge would be the hotside is spooling up the compressor before the engine can accept the mass flow from the compressor.
Not usually likely with any kind of decently matched turbo.
' have a compressor map for the turbo you're looking at'
It is a Made In China Ebay GT 3528.No.No turbo map.
' What engine?
60's pushrod engine.Don't want to say.Factory base engine type breathing.American.
' no problem with a GT35 on a 2.4L '
Great!
Goal is to put gauges on it and test it.
Little learn by doing.
So it is not a GT35, it is a mystery turbo. Ford 144?
Anyway.
Measure the compressor wheel's major and minor diameters if you can, and count the blades. It's probably close enough to a turbo with an available map that you can work with its map and not be too far off.
Turbos with available maps aren't THAT expensive, though. Journal bearing Precisions start well under a thousand.
' So it is not a GT35, it is a mystery turbo. Ford 144? '
Still a GT 35, GT 3582 Ebay Made In China turbo.Might be one of those Max Speeding Rods ones.
Brand new.
It is the engine that I don't want to say which one it is.
Keeping the question simple.
GT35 on a 2.4 6 cylinder engine.
Been told it is in the ballpark so we are full speed ahead on this.
Lot of Ebay adds say GT35 is for 1.6-3.5 so I guess it should work on 2.4.That's right in the middle of the range.Cool.
I was thinking it was a GT45 which is for 3.0-6.0 liter.Oops!
The turbo could very well be too big. I'm guessing an old American 2.4 6-cylinder could be outflowed bu a small modern 4-cylinder.
Do you know you have a problem or not? Has this been built and you have a surge issue or are you basing this on someone else's experience?
Seems like you need to come back with measurements or this isn't going to go anywhere productive (cue 7 page long thread where nothing gets accomplished, someone gets insulted, and mods have to close it down).
In reply to The Californian :
GT35 is a model name, not a generic size. If'n it's not a Garrett then it's not a GT35. You don't know what you have unless you measure and compare.
There were Chinesium turbos smaller than a GT35 being sold as "GT45" turbos.
' old American 2.4 6-cylinder could be outflowed bu a small modern 4-cylinder. '
I get you.When they say 1.6 to 2.4 they mean a fairly current one.
Good catch.
Then we are back at square one.
When we put it on and run it what should we listen and watch for?
Will it surge?
Anything else that might burn down or destroy our little 2.4(antiquated)?
I can tell that you are a new poster to this page.
Not because of anything other than it is obvious you are worried about posting the exact engine.
This forum is very open and into weird ideas! We have had a person take the regular 1.6 out of a miata to pit in a 3 cylinder to get better fuel mileage. It was one of the most viewed threads.
What I'm saying, is don't be embarrassed or worried that everybody is just gonna say "that's dumb. Put an ls in it!". Cause that ain't gonna happen here.
Actually, you are more likely to find somebody with intimate knowledge of that engine and it's totally possible that they have already turbocharged or supercharged it.
In other words, let us in on the secret! We can help!
' intimate knowledge of that engine and it's totally possible that they have already turbocharged or supercharged it. '
That is what we wanted to avoid really but thank you.
We are going with this Ebay GT3582 is a clone of the Garrett one.
Watched a couple of Youtubes about GT35's and they do suggest taking them apart before running 'em.
The Californian said:
' intimate knowledge of that engine and it's totally possible that they have already turbocharged or supercharged it. '
That is what we wanted to avoid really but thank you.
We are going with this Ebay GT3582 is a clone of the Garrett one.
Watched a couple of Youtubes about GT35's and they do suggest taking them apart before running 'em.
Sorry If that came across as condescending. I just meant that there are a TON of crazy knowledge able people on here that can help!
Why would you want to avoid that?
You have me super curious now! Lol!
If you are saying something could you just say it please?
Ran across a tidbit in a book.
'Increasing speed of compressor DOES NOT increase air flow.It increases pressure.'
We are going to keep that in mind during this little adventure.
This thread is completely pointless thus far.
Yeah.We will will persist anyhow if it is okay with you.
Does anybody have experience putting a turbo on that was too big?
Even if they took it off after a few minutes.
We would like to know a little about what to expect.
It will be a 'pull through' carburetor set up.
Will the compressor just windmill and pass through the air fuel like it is just more plumbing?
If it does make a little boost will it be 'healthy' boost or all choppy or something?
Thanks.
You have an unknown turbo pulling fuel from what I assume is the stock carb not at all set up for what you're going to integrate it with on an engine so special you won't mention what it is. You've not talked about ignition or really anything. You're asking for advice on if it will be "healthy boost or choppy or something".
I think you'll be fine. With your willingness to listen and learn I really have no doubts anymore.
Unless the motor is super rare just put it together. Worst case it's so large it won't spool up. More likely if it's oversized it will spool up just late enough to drive right into your rev limiter, or perhaps into valve float depending on your motor.
Best case it starts making positive pressure early enough that you have 2000rpm of power to play with. If this is the case all you need to worry about is the spark being right and the fuel being correct and you are literally or figuratively off to the races.
HalfDork
Sort of blew by it.
Your response was full of good stuff.
Thank you.
In reply to The Californian :
I think you are replying to Patient Zero, whose status on the board is HalfDork.
In any case, we would love to help, but Patientzero has a very valid point. You've come in here, mentioned a GT35 sized turbo, and some sort of 2.4l six cylinder, then asked if it was a good idea. What's the redline? What kind of control over fuel and timing do you have? What's the max rpm of your engine? V or inline? All valid questions that would help us help you, but you are playing coy and keeping everything hush hush.
That's akin to starting a thread titled "Car won't start", telling us your car has an engine and won't start, and then refusing to provide any further info.
Option 1) Let us help
Option 2) Do what you want.
Either one is fine with me, it might work great and be awesome, or you might miss out on some pertinent info and scatter the block. I don't really care, it's not my money. Just don't half-ass it.
We have an unbelievable resource here, and you aren't using it to your advantage. That's what irritates me.
Peace,
-Recon
The Californian said:
If you are saying something could you just say it please?
Ran across a tidbit in a book.
'Increasing speed of compressor DOES NOT increase air flow.It increases pressure.'
We are going to keep that in mind during this little adventure.
I'm saying:
Give us the details if you want help.
In reply to Recon1342 :
He's said that the fuel setup is a carb upstream of the turbo, so the air/fuel stream will be going through the turbo. That's the extent of the information shared thus far on fueling.
