Re: best turbo upgrade with stock everything
You could try out your 20G turbo & see how you like it. You might like have the better top end charge, but it is only slight.
Changing to a straight through designed muffler will help a lot, taking the cat off helps even more ,but that's illegal unless for off-road racing purposes. :tup:
I can tell you from first hand experience that w/a cat installed & running my 12 CM turbine housing it is a noticeable difference in how slow it gets into boost, being able to brake boost it takes longer also.
It is still pretty fast, just not as fast.
There is a big difference in spool up time when running & not running a cat even w/the stock 8CM turbine housing.
If you can install a larger cat it should flow better, but not sure if it will pass a smog check here in Cali.
You also need to make the intake air more free flowing, not just the exhaust, they both need an improvement over stock in order to make the turbo spool-up quicker.
I ran a 10CM turbine housing on my 20G turbo & I could not tell if it was any slower spooling than comparing to my stock turbo, it did make more power & seemed to make more power up top just not a whole lot more.
I never ran the 20G & 10CM turbine housing combo @ a track, but I would guess it might have gone a tenth quicker than stock.
I ran a 12.29 & 12.31 @ 108-107 MPH back to back w/my stock turbo.
To date w/my 20G turbo w/a 60-1 compressor wheel & a 12 CM turbine housing running pretty lean 13.8 A/F ratio & spinning the tires I only ran a 12.0 @ 108 MPH. The MPH was low I think because it was lean.
Had stock injectors @ the time. Now currently using Ford (cough) 36 lb blue top injectors.
I bought one of these mufflers
http://www.ebay.com/itm/QTP-12300-A...Parts_Accessories&hash=item53fd90d744&vxp=mtr
but in a 4" for a different project, looks really nice & is all 304 stainless material, have not tried it out yet but a muffler like this would be a good choice also.
This one
http://www.ebay.com/itm/Magnaflow-R...Parts_Accessories&hash=item232ddbcb72&vxp=mtr
might be pretty loud as it is a short muffler. We have to deal w/the Po-Po/5o, here if our cars are too loud.
The muffler I currently use on my Sy is like the old Gibson round, straight through design, it is quite long, guessing from memory 24", 3" inlet/outlet. I has a good rumble @ idle & cruising but is pretty loud when @ W.O.T.! I have gotten compliments on how it sounds @ idle. I still use the stock 2.5" downpipe stock cat.
If I were to guess, I would have to say, if you are completely "STOCK" & were to bolt on a 20G/14CM turbo, I would have to say it will be slower in the 1/4 mile, ET wise, 60' much slower also. Just because I do not think it will launch as hard as a stock turbo.
Anyone else agree? With this last statement?
