Spool Comparisons

[JOMARO]

I want to see what spool will be like with the 6764 t4 .81 A/R and open SteedSpeed.


Sent from my iPhone using Tapatalk

+ 1

[NOTORIOUS VR]

My results...

2.9L M52 @ 8.8:1 CR
S52 Cams - Ported head stock valve size
94 Pump fuel
AR Fab V1 Twinscoll T4
GT4094R w/ 0.9x housing
12 psi spring in both gates - no boost control only bottom of the gates are connected to turbo, both gates dumped to atm.
3" Turbo back to Vibrant Ultra Quiet + Vibrant Black 3" to dual out
Stock ZF w/ 2.93 LSD
255/35/18 rear tires

WOT @ 2100-5000 in 4th gear on the street

0 psi @ 2100
2.46 psi @ 2500
4 psi @ 2800
5.22 psi @ 3000
6.67 psi @ 3200
8.7 psi @ 3400
11.16 psi @ 3600
12.6 pis @ 3800
holds 12.6-12.8 till about 4500 RPM where boost creeps to about 13.3-13.7 psi



you can DL the .csv of this 4th gear pull here: http://schnell-engineering.com/SK/4th-gear-spool.csv

[Matutino]

Very similar spool to may set up.

[pbonsalb]

From a bigger turbo on a smaller engine.

[NOTORIOUS VR]

I have zero doubt that once I add boost control my spool will increase (lower RPM) by a LARGE margin.

FWIW, my setup at this boost level made 507 whp @ 13.5 psi, in 4th on a Dynojet.

[Matutino]

From a bigger turbo on a smaller engine.

Yes but remember I have a bigger wheel than a regular gt35, bigger exhaust housing and bigger cams than him, also a different manifold.
I wish I had another turbo laying around to swap it, it could very well be a turbo issue although so far all garrets tested have had very similar results

[Butters Stoch]

Yes but remember I have a bigger wheel than a regular gt35, bigger exhaust housing and bigger cams than him, also a different manifold.
I wish I had another turbo laying around to swap it, it could very well be a turbo issue although so far all garrets tested have had very similar results

If I was you, seeing what others have got out of this Steed Speed I'd be switching turbos. Or all that work for nothing.
It was the whole point of installing it, spool a big turbo like a little turbo with minimum peak HP loss.
If everything else is correct 100% and it just comes down to your turbo being better on paper then real life, make the change. I can't believe how quick mine is spooling. When I'm cruising at 65 the turbo is screaming to be unleashed.
Your results could be had with a spa and an extra grand in your pocket. Make dam sure its the turbo , then get rid of it.
I'm stupid happy with the gains I have seen from a tubular 666 to the twin scroll. Way way way better than I expected as for spool. The creep is another thing. But if your running a 3" exhaust , you won't fight that.

[pbonsalb]

Yes but remember I have a bigger wheel than a regular gt35, bigger exhaust housing and bigger cams than him, also a different manifold.
I wish I had another turbo laying around to swap it, it could very well be a turbo issue although so far all garrets tested have had very similar results

You have a bigger compressor wheel, but it is still smaller than a GT4094R wheel. Your turbine wheel is much smaller than a GT4094R turbine wheel. Your 1.06 housing is larger than his 0.95 housing, so that is a distinction not in your favor, but probably the only one. Your mild schrick cams provide as good low end as S52 cams according to most testing and there is one test from years ago showing they actually help spool. I think the TS Steedspeed would spool a turbo better than the probably higher flowing tubular TS AR V1, but don't know that for sure.

I think either something is wrong with your setup or the turbo is not a good choice, but without examining and driving your car, I could not say which. With all your logging ability, you might be able to determine setup issues by comparing to the results of others with similar logging systems.

[Butters Stoch]

Are we sure a 35r 1.06 is bigger than a 4094 .95 ?
AR is area ratio of the turbine with a bunch of other math that I have no interest in doing.
But for giggles 50% of 100 is more than 60% of 75. Although 60% is bigger than 50% when only looking at the XX%.

[Matutino]

If I was you, seeing what others have got out of this Steed Speed I'd be switching turbos. Or all that work for nothing.
It was the whole point of installing it, spool a big turbo like a little turbo with minimum peak HP loss.
If everything else is correct 100% and it just comes down to your turbo being better on paper then real life, make the change. I can't believe how quick mine is spooling. When I'm cruising at 65 the turbo is screaming to be unleashed.
Your results could be had with a spa and an extra grand in your pocket. Make dam sure its the turbo , then get rid of it.
I'm stupid happy with the gains I have seen from a tubular 666 to the twin scroll. Way way way better than I expected as for spool. The creep is another thing. But if your running a 3" exhaust , you won't fight that.

So far I have done boost leak, timing check and wa not able to find anything.
I'm going to do another compression test and leak down after swapping cams with stock cams this weekend.
Other than that I'm not sure what else to check, any pointers?

You have a bigger compressor wheel, but it is still smaller than a GT4094R wheel. Your turbine wheel is much smaller than a GT4094R turbine wheel. Your 1.06 housing is larger than his 0.95 housing, so that is a distinction not in your favor, but probably the only one. Your mild schrick cams provide as good low end as S52 cams according to most testing and there is one test from years ago showing they actually help spool. I think the TS Steedspeed would spool a turbo better than the probably higher flowing tubular TS AR V1, but don't know that for sure.

I think either something is wrong with your setup or the turbo is not a good choice, but without examining and driving your car, I could not say which. With all your logging ability, you might be able to determine setup issues by comparing to the results of others with similar logging systems.

I had s50 cams not s52 although I don't know if there is a difference in between them.
I was under the impression a tubular manifold twin scroll such as AR spool faster than our steed speed.
Looking at the logs I'm limited to the info I can get due to OBDI, so far I can tell I'm running lean but that won't change spool tho.

Are we sure a 35r 1.06 is bigger than a 4094 .95 ?
AR is area ratio of the turbine with a bunch of other math that I have no interest in doing.
But for giggles 50% of 100 is more than 60% of 75. Although 60% is bigger than 50% when only looking at the XX%.

You might be right, would have to do some research on it

[vollosso]

Mat what tune are you running?

Also can you post your turbo specs short hand?


Sent from my iPhone using Tapatalk

[Matutino]

Mat what tune are you running?

Also can you post your turbo specs short hand?


Sent from my iPhone using Tapatalk

Currently running TRM tune, HTZ GT3586R 1.06 housing, Speed Speed twin scroll with modified TRM piping, 8.8:1 freshly built engine with stock size supertech exhaust and intake valves, 3" SS exhaust, 256/264 shrick cams

[chikinhed]

I think that when we are posting our boost vs rpm numbers we need to also specify if the numbers were gathered on the street or on the Dyno and what kind of dyno. Numbers on the street will be much better than on a Dynojet.

[NOTORIOUS VR]

I think that when we are posting our boost vs rpm numbers we need to also specify if the numbers were gathered on the street or on the Dyno and what kind of dyno. Numbers on the street will be much better than on a Dynojet.

Good idea... updated my post to reflect that.

[dburt86]

So far I have done boost leak, timing check and wa not able to find anything.
I'm going to do another compression test and leak down after swapping cams with stock cams this weekend.
Other than that I'm not sure what else to check, any pointers?




I had s50 cams not s52 although I don't know if there is a difference in between them.
I was under the impression a tubular manifold twin scroll such as AR spool faster than our steed speed.
Looking at the logs I'm limited to the info I can get due to OBDI, so far I can tell I'm running lean but that won't change spool tho.



You might be right, would have to do some research on it

what exactly is the problem with ur car?

[Matutino]

Appears per others that it has boost lag, I don't see 10 psi until 3600rpm and full boost until 4K

[dburt86]

Is the car not fun and really slow?

dont get too caught up in what the internet says. I mean I just saw a bunch of dyno graphs in this thread of 60+mm turbos making 5psi at 2500rpm on a dyno that's only load is the weight of the drum.

meaning that going up a hill in 5th gear, it would probably be making 10psi at 1500rpm with that logic.

now if the car is a pig and ur not happy with it, try some stuff to fix it

[pbonsalb]

I agree. If Matt is happy with 10 psi at 3500, no need for 20 psi at 3500. But if I knew I could have 20 psi at 3500 from a turbo that is even high flowing than Matt's turbo, I would want it. Sometimes it is best to ignore what others are doing.

I still question whether it's the turbo that is the issue or whether the car needs sorting.

[Matutino]

Car is a rocket, never felt better, is fast as hell and I'm afraid in 4th gear at WOT as I loose traction every now and then.
I was hopping for a better spool tho, yet no garrett has proven my set up should spool faster, even the gt30 has a slow spool with this same manifold.
Do I want better spool.... yes, the hole point of spending 1k to upgrade my gt35 was to have great spool VS getting a bigger turbo for a couple of hundred more.

[dburt86]

My only suggestion, make sure vanos is working and don't sweat the internet

and send it

[Butters Stoch]

If everyone else is getting bj's don't settle for a hj. Go get that bj for your self. Hell ya paid for it.

[crazyyardie]

If everyone else is getting bj's don't settle for a hj. Go get that bj for your self. Hell ya paid for it.

I need my bj too


Sent from my iPhone using Tapatalk

[spenka]

I need my bj too


Sent from my iPhone using Tapatalk

Mus a yaadie! Lol


Sent from my iPhone using Tapatalk

[crazyyardie]

Mus a yaadie! Lol


Sent from my iPhone using Tapatalk

that turbo spools late like my China gtx35 with my spa t3


Sent from my iPhone using Tapatalk

[spenka]

that turbo spools late like my China gtx35 with my spa t3


Sent from my iPhone using Tapatalk

So yo ago change it? GTX suppose to spool quick right? Wha A/R di China turbo ave?


Sent from my iPhone using Tapatalk