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Firstly what are you looking for from this upgrade?
better all around performance or high end grunt? You basically need to do some tradeoffs when you choose a turbo.
My friends 9-5 with following specs got fired up few days ago;
- B235R bottom end with std bearings and std connection rods
- B235E cylinder head, mild porting, modified T5 valves, stronger valve
springs
- forged JE-pistons, balance shaft chain removed
- ENEM P14 cams ( 264/9.6/112/1.0 )
- B235E std intake manifold
- tubular exhaust manifold
- GTBB turbo (
http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT30/GT3071R_700382_3.htm)
with smaller turbine housing ( A/R 0,64 )
- 1.0 bar wastegate actuator
- Siemens 630cc/3 bar injectors, current fuel pressure is 3.0 bar
- Walbro 255 LPH fuel pump
- 3''-exhaust without catalytic converter
- full alumium std placed Maptun ic
- big open air filter in std place
- custom intake pipe for GT30
- std air mass meter
- std aluminium ( MY1998 ) delivery pipe from ic to std throttle manifold
-rev limiter 7000rpm
Basically you will need to select the rpm range where you want the car to work "optimal", as a rule of thumb split the rpm range into three parts
and select one, where you want the engine to work. The car will work 2/3
in the rpm "slice" next to it, and poorly in the third.
With the 9-5 above the choosen rpm "slice" was the top, and all the new HW parts where built to back this up, cams, head, rev limter etc. Keeping this in mind the turbo is just on piece of the whole "system" which needs to be designed/built in a way that there is "balance" between the components. Due to the selction of HW and design the "optimal" rpm range for this car is +4000rpm and the car needs to be driven accordingly, or it wont pull too well, so be aware of it when you make the selection for your next turbo.
For instance slabbing a "huge" turbo to a B235R with near stock HW wont lead to anything good, since the turbo wont work too well in the range where the std HW does and the wice versa. (not pointed to your direction, just general talk).
The GT28RS and my cars specs on the other hand is aimed more at the middle of the rpm range, so it will work deacent in both low and high rpms. With this consept you'll never build you self a rocet, but you wont loose to much from the bottom either + the its ALOT cheeper. Maybe in the future I'll move to the next level, once I come up with money needed for the job.
posted by 81.197.201...
, Fri, 21 Oct 2005 11:35:24, Sat, 22 Oct 2005 05:32:35
, Sat, 22 Oct 2005 10:33:35, Fri, 21 Oct 2005 21:46:18, Fri, 21 Oct 2005 22:09:41
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