Spool data: 15 psi @ xxxx rpm

Where does a built S54 see 15 psi of boost pressure, in 3rd gear:

with a precision 6768

with a precision 7675

with a precision 7175?

I have 4 M3s all of them twin turbo. Two S54 M3s and Two S50 B32 M3s. All twin charged.

Would like to convert one of them into a single turbo but would like to know the spool.

At which rpm do you see 15 psi at 3rd gear?

With twin 68 mm 15 psi @ 6100 rpm, 3200 cc engine
With twin 62 mm 15 psi @ 5600 rpm, 3200 cc engine
With twin 62 mm 15 psi @ 5250 rpm, 3500 cc engine
With twin 57 mm 15 psi @ 4700 rpm, 3500 cc engine

im assuming you mean on tip in? most guys are now running the 6766 not 68

Originally Posted by Twin_Turbo_S54

With twin 68 mm 15 psi @ 6100 rpm, 3200 cc engine
With twin 62 mm 15 psi @ 5600 rpm, 3200 cc engine
With twin 62 mm 15 psi @ 5250 rpm, 3500 cc engine
With twin 57 mm 15 psi @ 4700 rpm, 3500 cc engine

Did u just answer ur own question?

Originally Posted by BDUB328I

Did u just answer ur own question?

He wants single turbo info.

If I had to guess:
- 6466 15psi@ 4200rpm
- 6766 15psi@ 4400rpm
- 6768 15psi@ 4450rpm
- 7168 15psi@ 4500rpm

Give or take a couple hundred rpm on each...just rough guessing based off dyno sheets running 18-20psi on ~8.5-9CR 3.2L on 91octane Fuel

On my 7168 on a 3200cc block (9.5:1), on E85.. I see 200kpa at 4500rpm
I do not have a dyno graph of my car on the 7275.. but I was told it spooled slower.

Originally Posted by Commanderwiggin

He wants single turbo info.

If I had to guess:
- 6466 15psi@ 4200rpm
- 6766 15psi@ 4400rpm
- 6768 15psi@ 4450rpm
- 7168 15psi@ 4500rpm

Give or take a couple hundred rpm on each...just rough guessing based off dyno sheets running 18-20psi on ~8.5-9CR 3.2L on 91octane Fuel

thank you, but read my below statements.

Originally Posted by MarcusLSB

On my 7168 on a 3200cc block (9.5:1), on E85.. I see 200kpa at 4500rpm
I do not have a dyno graph of my car on the 7275.. but I was told it spooled slower.

Marcus,

thats very useful information.

3500 cc
11,5:1 compression ratio
E100
68 mm turbo should see 200 KPA @ 3000-3200 rpm.

Do you know the max whp made with a precision 68 mm turbo?

Originally Posted by Commanderwiggin

He wants single turbo info.

If I had to guess:
- 6466 15psi@ 4200rpm
- 6766 15psi@ 4400rpm
- 6768 15psi@ 4450rpm
- 7168 15psi@ 4500rpm

Give or take a couple hundred rpm on each...just rough guessing based off dyno sheets running 18-20psi on ~8.5-9CR 3.2L on 91octane Fuel

dyno sheets cant be used unless it is a load type dyno such as dyno Dynamics.

On dyno Dynamics, I was able to play with the ramp rate (Load) and imitate road like boost build.

By using the correct ramp rate I was able to make boost at the same engine speed as I did on the road.

Now when a dyno jet is used, you cant play around load and that means boost build will be different compared to the road boost build.

As a result, if look at dyno graphs, a load type dyno has to be looked at.

Originally Posted by Twin_Turbo_S54

Marcus,

thats very useful information.

3500 cc
11,5:1 compression ratio
E100
68 mm turbo should see 200 KPA @ 3000-3200 rpm.

Do you know the max whp made with a precision 68 mm turbo?

I don't unfortunately.

I like that E100 on 11.5:1 I bet that thing rips!

Originally Posted by Twin_Turbo_S54

dyno sheets cant be used unless it is a load type dyno such as dyno Dynamics.

On dyno Dynamics, I was able to play with the ramp rate (Load) and imitate road like boost build.

By using the correct ramp rate I was able to make boost at the same engine speed as I did on the road.

Now when a dyno jet is used, you cant play around load and that means boost build will be different compared to the road boost build.

As a result, if look at dyno graphs, a load type dyno has to be looked at.

DynoJet does have Eddy brakes (not all but the xLC's do.).

Originally Posted by Commanderwiggin

He wants single turbo info.

If I had to guess:
- 6466 15psi@ 4200rpm
- 6766 15psi@ 4400rpm
- 6768 15psi@ 4450rpm
- 7168 15psi@ 4500rpm

Give or take a couple hundred rpm on each...just rough guessing based off dyno sheets running 18-20psi on ~8.5-9CR 3.2L on 91octane Fuel

Originally Posted by MarcusLSB

I don't unfortunately.

I like that E100 on 11.5:1 I bet that thing rips!


DynoJet does have Eddy brakes (not all but the xLC's do.).

I ve runnig on Alcohol and 11,5:1 compression since 2009.
Transfers S54 into a different engine.

3500 cc
alcohol
11,5:1
9200 rpm

Originally Posted by Twin_Turbo_S54

I ve runnig on Alcohol and 11,5:1 compression since 2009.
Transfers S54 into a different engine.

3500 cc
alcohol
11,5:1
9200 rpm

I've been on E85 for a little over a year and a half.. and I love it. My compression however has been lower (9.5:1 or 9:1).. but I'm going to raise the compression to 11.5:1.

Originally Posted by MarcusLSB

I've been on E85 for a little over a year and a half.. and I love it. My compression however has been lower (9.5:1 or 9:1).. but I'm going to raise the compression to 11.5:1.

Marcus, you ll love 11,5:1.

It seems as if onlyy you and I are interested in spool data

Me to.

After the fuel surge kit is installed we can do the runs for spool data but my 7168 is not cea it is just billet we r starting the fst install this week

Originally Posted by Providence

After the fuel surge kit is installed we can do the runs for spool data but my 7168 is not cea it is just billet we r starting the fst install this week

Good luck mate. Let me know if you need anything.