got another ?. has anyone changed out the internals/ fuel pump etc to handle more boost? how much time and $$ does that iinvolve, also if my tranny is shot I will go six speed (hopefully jpi would do it, the guy was pretty adimant about not wanting to tune my safce) how much time / money will that take? the money isn't the prob (I'm working out a deal to sell my old gs for pretty much what I paid for the new one.

 

changing out the internal fuel pump is easy. Walbro makes a drop in 255lph pump for our cars.

 

WOW the 426 will be worse. if the 3.76 is giving trouble the 4.26 will spool up so fast you wont need 1st gear.
Most go w/ the intank 255 Whalbo fuel pump for added fuel I don't think you need it if you staying around 340-350whp but some get it for anyway.
Tuning the SFAC-Alot of tuners perfer to use something that has more variables to control and manage the fuel, timing,boost,A/F etc it is just safer Jason has done Sfac tunes but if your asking someone to push the hi whp #'s they want tobe able guarantee it won't blow up.
With that said there have plenty of SFAC tuned fi GS400's but I don't think many pushing the 380ish rwhp some correct me if I'm wrong. Morris comes to mind, he gotinsane #'s from his RMM/SFAC tune.

It depends on what your comfortable with

 

I personally don't care for the SAFC too much, if they want me to get something better/ different I don't care, I'll probably go figure it out w/ jefftsai anyway so I can at least learn something/ move closer to being able to mess w/ it myself.

on the gearing, doesn't the gs3 have 3.93 gearing, what do the high boost gs3 guys do?

 

Wow they do? Maybe I'm missing something, by drop in do you mean the whole pump assembly is replaced or just the pump within the OEM assembly ?

I had a fun time swapping out the stock pump for the Walbro using the factory assembly. Instructions would of helped. It wasn't hard, I'm just saying it's not a simple DIY for someone who's not mechanically inclined.

 

hey what about true duals all the way back? does anyone do that, would there be a benefit?

 

Glenn, just pump. Solder 2 wires heatshrink and you're on your way.

 

I've got the 2.83 pulley. My tuner said I was not much over 6lbs, but I'll need to hook up a wideband to verify. 370 injectors and a "conservative" tune.

305's are next on my list now that Michelin FINALLY came out with that size in 20". I've only been waiting for the release for 3+ years

It's a direct bolt on just like the TRD unit.

http://www.carbonetic.net/products/carbonlsd.html

 

thats super clean glen....

 

wow you had the diff polished, I've never seen that, nice

 

I could of polished the cover, but I know it will be difficult to keep clean.

I wanted to try out this new PVD process offered by www.SIKIndustries.com. It's not chrome plating, but it has the durability and shine of chrome. It's not chemical dipped and it's not chrome colored paint.

The PVD process or Physical Vapor Deposition, can be used on non-porous materials like plastic to provide a chrome like finish without the chemical dipping. What would be difficult with chroming the differential cover is trying to get a smooth shiny finish inside all the nooks and crannies.

Here's what the cover looked like before I had it done.

 

sick......

 

very nice looking glen....

 

550CC injectors are way huge for what you are doing now. Heck I think I ran up to 500HP with 370CC injectors if I remember correctly My bet is that oncev you get the SAFC in there you will find it very diffucult to tune with injectors that big. With the 2.87 pulley you should be good with 310's or 370's at the most. YOu will be good at 400hp the engine will last and the tranny should hold up, once you go over 400hp you are in a whole different world, expect tranny issues, tunning issues if you are using the SAFC. For 400Hp you probably dont need to change out the fuel pump but if you want to then a single Walbro will be plenty. I kept the stock gears on my LSD and after some tinkering we wound up at 2650 as the sweet spot on the torque converter.

If you want over 400hp build the engine, figure out your fuel and timing management and have a plan for a tranny that will hold up as the stock one wont.

I hope this helps, not trying to dissuade you but want you to go into this with your eyes wide open. I would hate for anyone to have to learn like I did via trial and error.

 

oh not dissuaded at all, I have a plan for the tranny and management (jefftsai got me covered), he has a wideband and guage, I will probably go AEM for more/ better control. As far as the tranny he can getparts/ build mine, I'm just trying to find all the internals/ I need a breakdown of what I need to do/ the cost. Any thoughts?