gt3076R or GT3082R or GT3571R

[Slippi84]

That is not what you typed although it could have been what you meant. You should learn to communicate better.

Now to address what you meant, your still wrong. You can bearly see 5psi difference on the graph. 10psi or more yes, but 5 psi is too small to clearly show up.



I guess you've never learned to read a dyno sheet either. To see where full boost occured is very easy. If you look at the torque portion of the graph, you can see the point where the graph stops pointing upward at the same rate (a little before 4k) and begins to level off. That is usually the best indication on where full spool up occured.




Your so typical of the kiddie tooners today that are plauging the community. You spread misinformation, get called out on it, and then want to throw insults without ever providing any proof to back up your statements.

By the way, you ever heard of brake boosting?

For blcknspo0ln Yes I know that the average guy isn't makin 500whp on pump with a 50 trim but my recomendation fo 50 trim was more for it's spool characteristics then the 500hp goal cause if you go back he said he wants to have a car that he can rac around corners which I will hope he means road race/autoX.

Anyway Rick@AP you can dance around the facts if you want and try and sound all big and smart but your WRONG! your dyno is for 447whp period not 500. I don't know about you but 53whp is a lot to me. You haven't said what you did this with either. Why don't you stop acting like a newb and fill out your profile or atleast list your mods that you had when you made your dyno run with. I was very clear I was talkin about spool and never once talked about what you where spining your engine at so maybe you shoudl learn to read better. by the way I have a 65lb/min turbo and it's not easy to get 447whp pump and only 20psi out of it so I am real interested which turbo/setup you were using. You show me a ligit mod list and I guraentee I'll put wholes in your story and we'll see who the kiddie tuner is.

Just a side note most turbos that are bigger than a 50 trim like a 60-1 most GT series turbos t67's and such run like dogs below 25psi so I am really curious how your car with such a turbo made power at 20psi.


By the way what the hell does brake boosting have to do with spool up when your in 3rd or 4th gear which is when you usualy check to see what your spool time is. But i'm a kiddie tuner what do I know

 

[suicidal2af]

How about the anti-surge ported S housing? Pros, cons, is it worth an extra $100?

Dan

Ported housings allow some airflow to escape from the compressor. This has two effects:

1) Shifts the surge line on the compressor map to the left, quite noticeably.
2) Slightly lowers the efficiency of the compressor.

That said, the effect it has on efficiency is negligible, and if you can afford to spring the extra cash for the housing, it's worth it, especially on a larger turbo.

 

[shleppy]

From my experience there is no difference in spool time between 25 and 32 psi. With the gt series turbos once you get past 10psi, full spool is instantanious. The boost goes 10psi to 30+psi in 2-3 10ths of a second, watching the boost gauge is like watching the tach when the car is in nuetral-spool is that fast once it gets going.

 

[Slippi84]

Not that it matters because your right it is so short of a time but in 2-3 tenths of a second your car will jump 2-300 rpms when you hit boost. I have a GT series turbo I know.

 

[shleppy]

I saw less then a 200 rpm difference between 25 and 32 psi. In third gear I hit 32psi by 3800, so I don't really see what rpm your hitting full boost at is a big issue. However, a real issue with guessing if your combination is maxed out with these turbos is how much airflow your getting. At 25 psi I'm maxing out my turbo with airflow(53lbs)-the 32psi pull was a accident-my first pull with the mbc screwed almost all the way out just to see where the boost was at. How much airflow were you getting during your 447whp dyno pull Rick? That should tell us if running more boost may get you 500whp on pump, which has been done with a 2.4 and the 3052(read 3076) by fp. It might take water injection, but if he's not maxed out airflow wise, then with more boost and good tuning it should be possible.

 

[Rick@AP]

How much airflow were you getting during your 447whp dyno pull Rick? That should tell us if running more boost may get you 500whp on pump, which has been done with a 2.4 and the 3052(read 3076) by fp. It might take water injection, but if he's not maxed out airflow wise, then with more boost and good tuning it should be possible.

Honestly I have no idea. I don't normally measure for it unless I am using racegas and pushing the turbo. Since that was a pump gas run I know that I had plenty of airflow left as that particular turbo was capable of enough airflow for 600-650hp. When I am tuning on pump I am normally only looking at knock, O2's and EGT's.

I am planning on strapping her to the dyno again this weekend with a few tweeks and a larger turbo (75~80 lb/min) than what was used for the posted dyno. I'll try to remember to document airflow if it is of importance to anyone.

 

[shleppy]

Thanks, I would appreciate it. I'm currently trying to get 500awhp from my combination on 93 and water injection. Good luck with proving the nay-sayers wrong.

 

[Rick@AP]

No dyno results, the guys that run the dyno that I go to decided to take the day off and not tell me, even though I'd reserved the dyno for that day. Trying to rescedule now.

 

[Rick@AP]

Sorry to bring this back from the dead.

I never was able to get my car back on the dyno due to tuning issues but we had a dyno day here and one of our local tuners put a car that they just built on the dyno. The car is an EVO VIII w/GT35r and a fresh built motor (less than 20 mi.)

The car put out 495 hp @ 20-21 psi on straight pump gas (no nitrous, alky injection, etc.) on a very easy pull to 7500rpms. The car could have made more if the pull was taken to 8000rpms but since the engine is fresh the temptation was resisted.

 

[Slippi84]

Sorry to bring this back from the dead.

I never was able to get my car back on the dyno due to tuning issues but we had a dyno day here and one of our local tuners put a car that they just built on the dyno. The car is an EVO VIII w/GT35r and a fresh built motor (less than 20 mi.)

The car put out 495 hp @ 20-21 psi on straight pump gas (no nitrous, alky injection, etc.) on a very easy pull to 7500rpms. The car could have made more if the pull was taken to 8000rpms but since the engine is fresh the temptation was resisted.

Nothing like a good linear power band

 

[CrazyGSX]

hi i have been doing homework on my turbo and i have a GT3571R with out the surg ported shroud. ill see where it gets me. and i want use meth i think

 

[shleppy]

You should be able to make around the same power as a 50trim. I'm just surprised you didn't get the surge ported housing. Even with it I surge from a 3000 rpm roll in third through 5th pretty badly. You just have to remember to always downshift before you stomp on it if your below 3800. Please tell us how the turbo runs for you when you get a chance.

 

[definitiveno]

Tha torque curve gives me a boner

 

[Slippi84]

Tha torque curve gives me a boner

Get off the computer and go find a gf NOW j/k