What lb/min are you flowing on pump & bigger turbos

[tstkl]

now I know why they say big turbos aren't happy at lower boost levels. A gt-12 flowing the same amount as a small 16g with only a 3 psi difference. That could only happen at lower psi levels.

Im still on the 14b, and I don't have dsmlink, so I dunno what my lbs/min are, but my best guess would be 5-7 lbs/min

 

[Mike1992]

Im still on the 14b, and I don't have dsmlink, so I dunno what my lbs/min are, but my best guess would be 5-7 lbs/min

I logged my 14b at 35lb/min at 21 psi, so you never know and ran a best of 13.2 on it.

 

[tstkl]

I logged my 14b at 35lb/min at 21 psi, so you never know and ran a best of 13.2 on it.

I was exadurating, I dailyed my car at 21 psi until the wastegate desided to start screwing with me and I saw as high as 28 psi. I love when people try and say the 14b can't hold high boost, because their car didn't. On stock cams, you will have a hard time outflowing the 14b. Its a magical turbo, but I think we all know that. Once I build my block/head I'll probably weld the wastegate shut just for the hell of it until I get a larger turbo.

Either way, I like how close these numbers in this thread are. 35 lbs/min for the 14b, 39lbs/min for the e316g, 44lbs/min for the fiddy, I think we should say our spool times too. I know my 14b hits 10psi by 3100 and creeps from there. (straight line from the throttle body to the wastegate). I think I hit like 23 psi by 5600, but thats with the wastegate open, so those are pure boost creep numbers.

 

[jabinya]

How do you calculate my lbs/min?

 

[nanokpsi]

Either way, I like how close these numbers in this thread are. 35 lbs/min for the 14b, 39lbs/min for the e316g, 44lbs/min for the fiddy

The rest of the engine set up and volumetric efficiency will have a much greater impact on engine flow than the compressor will. The only time the compressr will have an impact on the results is if it is being maxed out. People with near identical set ups should have prety close fow numbers even with wildy different sized compressors, but different climates and tuning devices and air metering differences are probably causing some errors.

 

[UMR98GSX]

36 lbs/min @ 18psi, PTE 3255E, stock 7 bolt, 91 octane

 

[andymoraitis]

I'm guessing around 44-45 lbs/min on a 50 trim running 11:1 with low timing at 28 psi on 93 and octane booster. Full spool is by 4400. Other mods in my profile.

I'm sure the large sidemount is holding me back.

 

[Syndicate13]

40 lbs min, Green, 2G head, FP1 cams and an Evo3 intake manifold at 18psi. Full spool at 3796 RPM verified by DSMlink. If I ever get motivated I'll crank up the boost and turn on the alcohol, unless the car sells first.

 

[CanadianTSi]

but different climates and tuning devices and air metering differences are probably causing some errors.

Deffinitly Agree on that one.

 

[90blacktsiawd]

Full spool is by 4400. Other mods in my profile.

Isn't that kind of late for full boost with your set up?

 

[andymoraitis]

Isn't that kind of late for full boost with your set up?

Yup, it certainly is. I've tried running very lean AFR's at the onset of boost to make more heat, checked the cam timing and boost leak tested the snot out of this thing but it still wants to spool 28 by 4400. I saw a minor improvement by lowering the fuel pressure from 43 to 40 psi, but at those boost levels on 650's I don't want to drive IDC's into the stratosphere. I may try a little test at 1G base fuel pressure just to see what it does. If it improves dramatically, I'll pick up a set of 850's and run it at lower pressure.

What I've noticed about the Garrett 50 is that it seems to take a little while to hit 10 psi, but after that it shoots up like a rocket. I have a close friend with a G50 and his pretty much does the same thing. The only things I can think of is that the cams really aren't the right ones for my application and that I need to pick up a set of adjustables so that I can advance the intake and retard the exhaust.

Interestingly enough the 2.0 saw 24 psi on a Big 16G (stock cams) at 3600 and then at 3800 with the cams. When I switched to the stroker, I thought I would see a definite improvement but spool remained the same. Compression's very good at 175-175-175-180 so I can't pin it on that. Other than tweaking the cams, I'm pretty much SOL on how to improve it. Don't get me wrong, it's a freight train when it hits, but I'd like it to come on much sooner. There are people out there with 2.0's who spool this thing faster than I do.

My apologies to the OP for getting off topic.

 

[mitsuclipsegsx]

What should mine be at? I have pte BB 50 trim

 

[90blacktsiawd]

I hit 21-22 psi by 4k right now on my BB 50 trim. Thats with comp 200 cams, stock 6 bolt motor and missing 1 stud on the exhaust manifold to the head.

Andy i didn't realize that lowering the fuel pressure could decrease the spool time. I do understand that leaning it out at the on set of boost may help. Can you please explain why the fuel pressure effects it like that? I didnt check your mod list again so what cams are you running? Also are you sur ethat 850's would flow enough if set at 37.5 base pressure for that sort of boost? I currently almost max out my 750's at 43-44 base pressure with meth/water injection. But i don't feel that it should be requiring quite that much fuel.

 

[andymoraitis]

They're Comp 200's and we installed them straight up. Basically dropping the fuel pressure leans the motor out from a volume standpoint and generates more heat. The extra heat should then spool the turbo faster. It's basically doing what lean A/F's would do but with fuel volume. I'm about to go take a test run and see what it does.

Let me add the caveat that it's important to be able to read knock in real time with a test like this since the deprivation of fuel in the upper RPM's may not be too friendly to the internals (that was for the new members who might read this - not you!)

 

[90blacktsiawd]

My cams are installed straight up too. Now couldn't you get the same effect by leaning out the low end? It doesn't list anything to really "tune" with in your profile. Well, not anything you can adjust on the fly i should say.

Having something to monitor knock in real time is very important once you start modding your car. Through DSMLink i have my check engine light set to go off at about 9 counts (3 degrees of timing pulled). But of course the stock boost gauge is now a knock gauge so even if i dont hit that high of a count i still know when it's knocking.

 

[andymoraitis]

My chip is VERY custom when it comes to A/F and timing settings so all I do is tune with fuel pressure, boost, octane and knock (I use the stock boost gauge as well).

As an FYI, dropping the base pressure down to 38 did nothing for spool and gave me 5 counts of knock from 5500 and up where the timing peaks at 12 degrees. I'll either do something with the cams or leave it like it is and just live with it. It's still fast, but having more boost sooner would be a definite plus. I need to back down the boost anyway and take the MBC off since the clutch simply won't handle what I'm asking it to do. It's fine at 25 psi, but 28 takes it over the edge. Since the external is set up for 25 psi with no MBC, I'll leave it at that. So let me revise my earlier stats:

Around 42 lbs/min on 93 pump

 

[GILZTSIAWD]

61.9 lbs/min at 30.3 psi on stock cams, slightly ported head, about 70 degrees out on an scm6152e

 

[fulanititoo8198]

61.9 lbs/min at 30.3 psi on stock cams, slightly ported head, about 70 degrees out on an scm6152e

I'm assuming thats race gas? If so what do you do on pump? glad to see someone flowing some serious air with the same turbo

 

[Reese92tsi]

61.9 lbs/min at 30.3 psi on stock cams, slightly ported head, about 70 degrees out on an scm6152e

Wow, that thing must feel like a freight train. That time and trap in your profile wasn't at 60+lb/min was it?

 

[nanokpsi]

61.9 lbs/min at 30.3 psi on stock cams, slightly ported head, about 70 degrees out on an scm6152e

Let me guess.....MAFT.

Thats easily around 550whp, which I know for a fact isn't happeneing with a scm/stock cam car. Sorry.

 

[fulanititoo8198]

Let me guess.....MAFT.

Thats easily around 550whp, which I know for a fact isn't happeneing with a scm/stock cam car. Sorry.

What do you mean "let me guess maft" are they not accurate?

 

[nanokpsi]

The MAFT's tend to inflate the airlfow signal a good amount. Using it for tuning and then trying to reverse engineer the airflow factors in an even greater margin of error.

I had a 6152e as well. I flowed around 40lb/min in cold weather with my hks cams/2g head @ 22psi or so 28 psi was only showing about 45lb/min (c16) but it was in the upper 90s in the dyno room.

 

[90AWDTalon]

How do you calculate my lbs/min?

Log grams per rev, multiply by rpm to get grams per minute, then multiply by .00221 to convert from grams to lbs.

 

[90AWDTalon]

47+lb/min on an HX35 on pump gas.

I say 47+ becuase I hit this at 25psi, and when I run 30psi I still run the same max number, I however hit 47lb/min at a lower rpm at 30psi than I do at 25psi. I think something is keeping my maf from reading higher than 47, I haven't figured it out yet.

 

[90blacktsiawd]

My chip is VERY custom when it comes to A/F and timing settings so all I do is tune with fuel pressure, boost, octane and knock (I use the stock boost gauge as well).

As an FYI, dropping the base pressure down to 38 did nothing for spool and gave me 5 counts of knock from 5500 and up where the timing peaks at 12 degrees. I'll either do something with the cams or leave it like it is and just live with it. It's still fast, but having more boost sooner would be a definite plus. I need to back down the boost anyway and take the MBC off since the clutch simply won't handle what I'm asking it to do. It's fine at 25 psi, but 28 takes it over the edge. Since the external is set up for 25 psi with no MBC, I'll leave it at that. So let me revise my earlier stats:

Around 42 lbs/min on 93 pump

I'm not doubting you dont have it tuned well but wouldn't it be good to have something to tweak the settings with?


fulanititoo8198 the maft isn't always "that" inaccurate. There will always be a few things that dont transfer over exactically when it makes it's calculations to convert the signal so the ecu can read it. But for those of us not using it to tune and use it stictly as a mas it's not going to be that inaccurate. Especially not when you can dail it in with DSMLink and a map sensor or wbo2.