[supercharger options]

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[supercharger options]

hi guys,

anyone got any advice on which roots/screw superchargers will fit on an 86-93 302 windsor?

it seems you can get the eaton 112 s/c fairly cheaply secondhand with low mileage,few kenne bells and whipple/opcons on e-bay as well but the intake manifold sems to be the stumbling block in most cases...was wondering if anyone's adapted anything to fit

any info appreciated

regards

paul

ps not really interested in fitting a centrifugal s/c until i've exhausted other options.....also have EMS capable of running crank angle sensor instead of distributor(as it's in the wrong spot for most of the above options)

[Full boost in 1st with t3/t4?]

my T3 boosts exactly as mentioned as well..........not much(3-4 psi) boost in first,no wheelspin,reaching for second quickly............about 10-12psi in second by 3500rpm,starting to wind up nicely.............pulling hard in the top 3 gears,15 psi by 2000rpm

this is on an RB30ET in a 240z,3.36:1 diff ratio

i often think first gear is a waste of time as the ratios are to suit the donor vehicle which was 500kg heavier.............so i'm going auto and probably bigger BB turbo(GT30R)

my research leads me to suspect that the old school turbos are no match for newer technology............going to put my money where my mouth is real soon,lol

paul

WA

[Corrected airflow question]

....you around helix??

[Dyno chart for RB30ET]

anyone have a dyno chart for an RB30ET(sohc) running a GT30R(.63 or .82 turbine housing)

interested to see hp/torque/rpm graphic to help me decide if this is the turbo for me(street use,low rpm boost threshold)

thanks,paul.

[Corrected airflow question]

thanks helix,

finished turbo school ala garrett.....interesting and informative,did my figures and looked at some maps

 

what puzzles me is i was trying to plot RPM/airflow/MAP but all my calculations from 11 lbs/min(1500rpm) to 41 lbs/min(5500rpm) showed very little difference in MAP(around 35psi)....am i doing something wrong?i expected MAP to rise with airflow,not stay reasonably constant.

 

also when you plot a point on the compressor map ,ideally where should it be relative to the efficiency islands for a streetable car(low rev torque)

 

what i am really trying to work out is for an RB30sohc what does the torque/boost/rpm curve look like for a GT30R and GT35R with either .63 or .82 turbine housings....anyone got one?

thanks

paul

[Corrected airflow question]

Hi guys/gals,

 

i am attempting to unravel the mysteries of compressor maps

 

i understand the pressure ratio column(14.7 psi/BAR boost adding to 1 Bar atmospheric pressure)

i understand the surge line(you don't want any of the engines operating range to go outside of it)

i understand you want to keep within the best % efficiency throughout the rev range(not sure what the lower limits of efficiency are acceptable)

 

BUT how do you workout the lbs/min for a given engine at a particular revs??

cheers,paul

australia

disclaimer: "i understand" interchangeable with "i think i understand"

[Ball vs plain bearing turbo]

hey jeff p,

last time i was in a truck turbo supplier i noticed they had an add on device that 't's into the oil line to the turbo, once the oil pressure went above 'x' psi it would compress a spring in the reservoir and fill up with a couple of litres of oil

on engine shutdown the spring would decompress and pump the 2 litres of cool oil through the turbo bearings.......this should solve the problem you mention?

paul

[Turbo for RB30ET]

rb26det......what revs is your friend expecting boost to come on at? and what max psi?

[Turbo for RB30ET]

thanks for the input clifton,

what would be the downside of running the .63 turbine housing on the GT35R?

[Turbo for RB30ET]

Advice required,

i have been offered a new GT35R for US$1050 delivered to my door with a choice of turbine housings(.63/.82/1.06) and am thinking of using it on my RB30ET 240Z...i currently am running a std T3....i don't particularly want to modify the engine(head,cam,forged pistons,etc) i do have an aftermarket engine management system,intercooler,extra injectors,2 1/2" mandrel exhaust,bosch 044 fuel pump,RR malpassi fuel regulator

i do not want to lose my low rev torque or sacrifice any spool time and so my question is which turbine housing would suit me best

95% of my driving is sedate street use changing gears below 3500rpm

5% of my driving will see up to 6500rpm

i would rather feel a push in the back for the 95% and sacrifice a little top end for the other 5%

...........oh and just to complicate things a little.....would i be better with a GT30R?????

 

thanks in advance

[Boss 302]

anyone know whether headers and inlet manifold on a set off boss 4V 302 heads will fit standard windsor heads(ie are windsor and boss heads interchangeable as far as inlet/exhaust go)??

[Incon kit for 240Z....will it fit????]

thanks for the replies guys,

cobraz240z thanks for the offer however i am in australia....ah the tyranny of distance,lol

do you have any pics of your BBK conversion,why did you choose that brand of headers,how did the mild steel hold up to the heat in a turbo application,how did you mount the turbos to the socket ball connector on the headers,where in the engine bay were the turbos positioned,did you run water and oil plumbing to the turbos(how),did you intercool it???

many questions i know,hope you can help

paul

oh and do you think no-one has done this kit in a Z because it hasn't been thought of or has been tried and didn't fit.....i kind of think the second one??

[Incon kit for 240Z....will it fit????]

hi guys

wanting to know if an incon TT kit with GT28's will fit on the 302 sbf in my datsun 240Z without any problems?

mainly worried that the exhaust manifolds and turbos will not clear the inner fenders and shockie towers?

i currently have an edelbrock performer that is plumbed with injectors,could i retain this and use a factory throttle body/inlet or would i need to switch to a compatible "factory"manifold.....will this clear the hood?

any iformation,advice or opinions appreciated

thanks

[Incon kit for 240Z....will it fit????]

hi guys

wanting to know if i will have any problem fitting an incon twin turbo kit on my 302 windsor in my 240Z(right hand drive model)?

mainly want to know if the exhaust manifolds and turbos(gt 28;s) will clear the inner guards and shock towers

any info,opinions and advice appreciated

thanks

[GT 37 on an RB30???]

i haven't seen one on an rb30 either,that's why i am asking someone with a knowledge of compressor maps to shed a technical opinion on the combination

 

how is it different to the gt35 in the specs and how would you expect its performance to differ on an rb30

 

if you don't think it will work tell me why......that way it can be a learning experience for me and anyone who reads this thread

 

cheers

paul.

[GT 37 on an RB30???]

....a couple of reasons....

i already have the GT3782 and it is not far off new,i am not convinced the BB turbos are that much better than the newer(GT) nonBB(lot more expensive,don't seem to last as long??don't cope with end float??,may spool up only a few hundred rpm earlier)i think turbine technology is responsible for more recent gains than the advent of ball bearing cores

bear in mind this is what i think,not what i know,always open to more thoughts,facts and opinions

[Who is stealing my fuel pressure????]

you could try using a makeshift fuel tank to prove a point and possibly eliminate the cars tank as a problem.........like an unused(won't go boom when soldered) 1 gallon fuel(vented cap ) can with a metal pipe silver soldered in to attach your fuel line to......obviously use the appropriate caution and common sense when dealing with fuel to avoid a dangerous situation like spilling fuel in your car or having it near heat or electrical sources

or if you have a friend/local business with a boat you could try those removeable self contained fuel cells

good luck

paul

western australia

[Return or Not to Return]

gee traffics slow on this one

i would return the unused fuel to the tank for 2 reasons......to ensure a flow of COOL fuel to the carbies and prevent possible vaporisation problems(hot starts etc) however i would qualify this statement by adding that your fuel delivery system must be able to supply enough fuel PRESSURE at wide open throttle..........this may entail running a restricion in the return line to achieve this..........if your system is none standard you may want to plumb in an adjustable gate valve in the return line and turn it until you maintain adequate fuel pressure at WOT(this way you can adjust for later variables eg different fuel filter,bigger lines,different carbies etc)

oh and i would insulate the fuel lines in the engine bay anyway

only my opinion,seek others and then make up your mind

paul

western australia

[Chinese intercoolers????]

Anyone had any first hand experience with the cheap intercoolers on E-bay,can't beleive the prices AU$279 for a 800x300x100 bar and plate with polished tanks and 3" in/outlets.......last time I priced one it was up around the $1000 mark......that was several years ago though when I was building my last project!

[GT 37 on an RB30???]

anyone want to have a stab at how this garrett turbo would go on an rb30et with a wolf 3d and intercooler

 

gt3782

.58 a/r TSO4 with 4"inlet

59mm inducer

82mm major

1.11 a/r T4 turbine housing

66.5mm exducer

72.5mm major

non ball bearing

 

 

 

particularly interested in;

 

spool up guesses

final HP/rpm

torque/rpm

injector sizes required

ease of fitment(z240 engine bay)

 

cheers

paul

 

psi

[If your car can break R200V/R230 axles with ease you need the Super-Duty R230 axles!]

your workshop looks cleaner than my kitchen,lol.

any chance of posting the measurements of the bolt spacing on the flanges ie #1-#2 and #1-#4 ?

much appreciated

paul

[Faster spool worth the money?]

hi guys

given that the equivalent BB turbo is almost twice the price,over here anyway,how much faster is the spool up........are we talking barely noticeable,significant or astounding?

for those of you who might wonder what my application is,RB30,wolf 3D engine management,extra injectors,intercooled,15psi std T3.......considering switching to a GT35R

[How many miles out of your BB turbo??]

hi guys,

just wondering how many miles i can expect out of a street driven,ie raced less than 1%,BB turbo that isn't abused,in other words what's the most mileage you've got out of one and what was the first thing that went wrong with it?

[Ball vs plain bearing turbo]

thanks guys,food for thought,it seems most of you would choose the BB