nice to see another twin turbo sedan......sweet intercooler, BTW!

I know you aren't a big fan of SFR (recalling old posts), but did you look into their dual IC setups fro the g35s? I have the SFR ICs on my Greddy TT Sedan; I am only pushing 10psi, but my IATs are only about 9-10 degrees over ambient.

 

QuadCam

Your IATs are 9-10 degrees Celcius or Fahrenheit above ambient, and is that the temperature at redline after a long (4th or 5th) gear pull at full boost, or during cruise?

IMO and from what I read in various books, dual ICs are going to have larger pressure drop then a single IC, since they are inherently smaller and moreover there are two of them. Is each of those ICs fed my a single turbo, or is the flow from the twin turbos combined and fed in series through each of the two ICs? I alrady have the setup for a single IC, so doing two IC would not make sense anyway.

Tim is a good fabricator, I have never said otherwise. Dual IC don't appeal to me for the reasons above, and for aesthetics reasons. But there is no real reason why a properly setup dual IC should not work very well.

 

Awwwwww.....Gurgen and I our friends that dont see eye to eye Nice intercooler Gurgen.I think you might need some bigger turbos to go with that though

 

[QUOTE=GurgenPB]QuadCam

Your IATs are 9-10 degrees Celcius or Fahrenheit above ambient, and is that the temperature at redline after a long (4th or 5th) gear pull at full boost, or during cruise?

IMO and from what I read in various books, dual ICs are going to have larger pressure drop then a single IC, since they are inherently smaller and moreover there are two of them. Is each of those ICs fed my a single turbo, or is the flow from the twin turbos combined and fed in series through each of the two ICs? I alrady have the setup for a single IC, so doing two IC would not make sense anyway.



Each turbo feeds an intercooler and then the two intercooler outlets merge into a single pipe leading to the TB.


Tim is a good fabricator, I have never said otherwise. Dual IC don't appeal to me for the reasons above, and for aesthetics reasons. But there is no real reason why a properly setup dual IC should not work very well.


We went with twin intercoolers on the G for aestethics and for the simple fact that the two inlets in the bumper would allow alot more airflow over an intercooler sitting behind each one

 

[quote=TurboTim]Tim,

Each turbo feeding into one IC is definitely superior to the alternative, due to the lower flow per IC, hence no real pressure drop penalty over going with a bigger single IC for two turbos.

Aesthetics... yeah this is definitely personal, some people like the stock bumper and adapt to it..nothign wrong with that whatsoever...I prefer a single FMIC in the middle of the bumper... to each his own in this case!

So, is the 9-10 degrees F or C? And is it as cruise or WOT?

 

those temps are in fahrenheit (recorded via the UTI software for the UTEC) at WOT in 3rd and 4th gearpulls on the street.

It is not the best, but I was comparing the Outside temp gauge on my G's console to the recorded temps from the UTI Utec software.

I like the look of a big single, but I had no choice but to work with the stock '05-06 Sedan bumper as there are no aftermarket bumpers for those sedans.

 

Thanks Tim! We don;t see eye to eye most of the time, that is true... water under the bridge as far as I am concerned.

Actually, I have spent about 16-18 hours now working on an EXTREMELY detailed analysis on turbine flows, and would actually dispute your last point.

I think that the PE1420 compressors are PERFECTLY sized for a 3.5L engine in a twin turbo configuration, for up to 18-19 psi (not much higher than that; for my purposes, this is all I would ever want to run on my engine). I have actually done the science behiond this and can PROVE IT UNEQUIVOCALLY.

Waiting to QC the data one more time before presenting it, that is if anyone is interested. I hold the view point that turbocharging is a man-made science, and literally EVERYTHING can be explained, including high intake temperatures, turbo flows...etc... etc.. (this is unlike the life sciences, my field, where we just don't know close to 90% of the facts/reasons).

The analysis (in Excel format), consists of the user-definable variables that they enter into the spreadsheet, including:

- Boost levels for analysis
- Elevation
- T ambient
- P ambient (in addition to the elevation pressure drop ... say the ambient press is lowere than normal)
- P drop across the intake filter
- P drop across the intercooler/piping
- VE in the N/A example (which I calculated from stock g/sec MAF flow vs calculated lbs/min flow)
- compressor efficiency

Then the analysis includes calcualtion of VFR, PR, PRsys, DR, Density, for each boost level and rpm point, outputting:

- Tout from the compressor
- Tout from the intercooler (IAT)
- Volumetric flow rate VFR: cfm
- Volumetric flow rate VFR: m^3/min
- Mass Flow Rate: in lbs/min per turbo
- Mass Flow Rate: in g/sec per turbo

The last two are of coursr the most important, as they reliably predict the actual FLOW of air in terms of MASS, not jsut pressure, allowign you to plot the flow on a compressor diagram to decide on the sizing of the turbos for the engine.

I just do not listen to what people generally say about these thigns, and truly have to find out on my own, since no one else is doing it.

The only X-factor remaining is the turbine-side sizing, whcih is NOWHERE NEAR as sensitive to changes as the compressor side.

 

I see... so those readings are at the end of the run. I ask because the temps rise through the run, as the intercooler mass absorbs it's heat from the hotter induction air, so the IAT commonly rises through the rpm band.

Thos are good temp deltas nonetheless, so the intercoolers are obviously working well, even if the temps go higher at redline than 9-10 degF delta.

 

Hey Tim, when is my dual IC set up shipping out? Cant wait!

If they made a nice single opening bumper for the 05-06 sedans I'd have have gone with a single for sure, looks much more aggressive. Yours look very nice Gurgen! Love your car too! You gotta get it to the track soon...

 

He was the first TT sedan from what I know.

So close...