Ok, today i found out more about the turbo on my car. As i have said before, Its a TEC Sport 350. The compressor housing is a Garrett .60 A/R, and after contacting the company today, I found out that it will flow 585 CFM. What is the CFM on a stock S4 turbo? Also, the wastegate is currently set at stock boost pressure, what is that again? Im planning on throwing an MBC on it, and prolly running about 10psi. What advice do you have as far as injectors? Im gonna run an SAFC Neo, do you think i should run 720's in my secondaries with stock primaries? Or should i run a full set of 720's? Thanks for the help.

RoninRX7

nobody knows? Im assuming there has to be a compressor map for an S4 turbo out there somewhere, but after searching, i couldnt find anything. No thoughts on the injectors? What would be safe for a 60 trim? can i get away with 550/720's?

 

Im not sure about stock cfm readings. I know stock s4 boost like 5-6psi at stock. if you are planning to boost more than 10psi i would recomend 720cc+secondaries injectors. 550cc (stock injectors size) will be fine for primaries. Also SAFCII would be nice, also you might want to look into getting a FCD because stock boost cut is @ 8psi. Also if you boosting over 10psi with stock turbo, plan on getting a FMIC, otherwise you wont get more than 9psi if i can remember correctly.

Things you might want to do:
720cc + secondaries
Some sort of fuel management SAFCII or SAFC or chipped ecu
TID and intake filter
port your stock wastegate otherwise you get boost creep (bad)
Full exhaust Dp, no cat, etc
FMIC
FCD to boost over 8psi before hitting fuel cut

 

Hey thanks for the reply. Thats good to know i can get away with keeping the 550 primaries. The turbo I have is not stock. Its got nearly a 3 inch inlet, and is a garrett .60 A/R housing. I believe the wastegate is modified, so boost creep shouldnt be a problem. I also currently have a 3" stainless DP, HKS SSQV, and all my emissions removed, modified airbox, along with a walbro 255lph pump, and an aeromotive FPR. The motor is a rebuilt Adkins with S5 turbo rotors, and 3mm apex seals, so i doubt it will have many reliabilty problems with only 10psi. I think all my fuel delivery is covered minus injectors. Can i make the 720 secondaries work with the factory ECU until i get the SAFC, or should i do it all at once?

I think ill prolly do an ARC top mount if i can find one, for looks, and because i dont want the FMIC to get beat up like the one on my 1G Talon did. Do you guys know if the JDM top mount is an upgrade? Thanks for the help.

RoninRX7

 

the JDM TMIC is exactly the same as the A-spec one, it just has different writing. also, you should have no touble boosting over 10pli without a FMIC, you will just have issues with heatsoak, and you won't have as much hp as you would with a FMIC.

I have a question as well though, sort of a thread jack but definitely related.

if I upgrade my fuel pump to a venom 255 and I have an AFC (i know its ghetto, but it works) do I need a new FPR? running stock everything else except intake/exhaust.

 

Hey no worries, yea i would really recomend and aftermarket FPR. The only downside you will find is that the fitting for the fuel rail is a pain in the *** to find, and its kinda expensive to convert to an aftermarket FPR. Total with fittings, gauge, and my aeromotive one it cost me $180. Its worth the security of knowing that the fuel pressure is right, and it wont fail. The problem with using the stock unit is the volume that the upgraded pump flows is much higher. hope that helps.

 

well if your running .60 AR garette, you might want to have more than 720cc secondaries. You might want to look into 1000cc secondaries, a standalone unit for sure. Also FMIC would be highly recommended at this point. Redoing your whole fuel system - IE Fuel pump, Fuel line, FPR, - Stock fuel rail should do fine. if you have S4.

 

.60 a/r compressor right?

 

hey is yours the blue t2 for sale on craigslist awhile back?

 

Holy crap there's about 7 threads in one here.

1: There's no compressor map (that I know of or have ever seen) for the stock Hitachi Ht-18. Iceblue posted a *similar* map, however its not the same since going by that map would put the stock turbo at 300whp capable...

2: Dunno what CFM either. I'm sure some guru probably has a number but its irrelevant to the inital question anyways since we aren't even talking about the stock turbo.

3: Since you don't even know how much you're boosting currently (as the statement "Also, the wastegate is currently set at stock boost pressure, what is that again?" would imply) I'd HIGHLY recommend a boost gauge as your next purchase.

4: Run 720's. You'll for sure have enough fuel and there's no sense in chancing things when you're pushing a secondhand setup like this.

5: Get a standalone

 

thanks for the help. I dont plan on pushing more than 10psi, and I have an aftermarket boost gauge already, but i have not had the chance to run the car to its full potential on the wastegate yet, so i cant check what its set at. The setup im running is not secondhand, it is in the respect that im the second owner, but the first owner only bought the turbo and never installed it. It was brand new when i got it, along with the 255 walbro. When i did put them in though, the car was running rich, and i ran into many issues which resulted in me buying the FPR, and eliminating all the emissions stuff.