Top RB20 Club... do you have over 260rwkw?

[SimonR32]

LOL...farkin spreadsheets I was bored at work and trying to do it covertly. Im half pissed and bored at 12.30am in a hotel...ill try again but cant guarantee the result will be any better considering the state im in

that 4th gear comparo for road speed to revs...cool, i need my spreadsheet on my laptop to work it out accurately. What sized tyres have you assumed, (tyre circumference)???

<{POST_SNAPBACK}>

i actually was going to give it a go as well but for some reason this laptop does not have excel on it... random

um, my tyres were 255/40/17's and was about 36.6, but i just worked out my mate with 235/45/17's was around 37.6

somewhere around there so make it around 37 and u will get if fairly accurate

[Roy]

How is that? It seems i had changed the scales to try and move the boost curves away from the power plots, and it all went bad from there...but i think this looks better.

Yeh its pretty easy to do the conversion, but im lost without my laptop, i have all the gear / diff ratio, tyre sizs etc on it.

[SimonR32]

much better

looking at carl h graph makes me get bad ideas about upgrading to gt30r love and some cams

its really not that laggy for the extra power

[Roy]

Cerbera, if my understanding of your Apexi turbo is right, you have the P25 exhaust housing, which is about a 0.96-1.01 A/R housing.

Would love to see your results if you used the smaller P22 housing, dont they also do a P20 or something (IHI use mm instead of inches so i think you just divide the PXX /25.4 to get an equivelant Garrett A/R, so P25 is 25/25.4, so about 0.98 A/R)

The P20 is about an A/R size of 0.78 which would get that thing boosting way earlier and harder

[SimonR32]

im unaware of how the scale of the apexi to convetional garret a/r works but just looking at the housing it is at least as big as a 0.8a/r

my turbo came only in a p25 or p22 housing so im unsure if you would be able to connect a p20 housing as the actuator mounts may be not suitable ?!?

i do agree with you tho, the p22 housing would probably be much more suitable to the 2l and i doubt i would loose much top end if any

only problem is finding a housing to borrow or buy for the test, apexi turbos dont seem to grow on trees

Edited February 12, 2006 by Cerbera

[Roy]

Yeh , i had a bit of trouble finding the smaller housing on the TD06. But im sure that IHI use metric where as Garret use Imperial, so P22 woud be 22/25.4, so about 0.86.

Ill have a look around tomorrow night. Based on the changes i saw in power with the smaller housing...your thing would be a hard to beat setup that s bolts to the std manifold. Be interesting to see of you crack the top end your hunting after the next round of tweaks

[SimonR32]

next round of tweak is going on as we speak

new ignition is already on, but still the miss

fuel pump died on friday so hopefully replacing it with bosch 040 will maybe fix the miss as it may have been the rail running low pressure top end

also tossing up the idea of welding a external gate onto the standard manifold for better boost response and control as well as to lower the backpressure in the exhaust manifold top end

Edited February 12, 2006 by Cerbera

[yogi000]

2530 is doing pretty good till 110km/h then it flattens out.

top work roy.

[carl h]

much better

looking at carl h graph makes me get bad ideas about upgrading to gt30r love and some cams

its really not that laggy for the extra power

<{POST_SNAPBACK}>

hahaha, oh you know you want to join the darkside.

also keep in mind my engine wasnt in good nic (140 psi HOT! across all cylinders) so on an engine with higher compression its very possible it will come on earlier and even harder than she did in mine.

gt30r is very well suited to the rb20, almost as if it was designed for it......

[boostn32]

yes thats where im heading, GT30R way. will see what i can do with the Trust TD06-20G kit then its up for sale.

[Roy]

I found this plot on NS of a TD06 on an SR20DET with Greddy TD06 L2 20G, Built motor, Hks 256in/264ex, Hks cam sprockets, Autronic, Msd Cdi, Bosche coils, Blitz 850cc, Bosche fuel pump, Blitz intercooler, Blitz stainless pod, Blitz Sbc iD.

Was havign a sticky beak as im playign with motor combos at the moment (will probably not end up doign any of them) and all this talk about SR20DETs being more responsive etc etc. Plus if an RB can be put in an S13 so easy, then surely the SR is a relatively straight forward swap. Combined with the weight savings, cost of 4 rods/pistons etc, and the much talked about lack of torque of the RB20, against the SR superiors supposed ability to spool turbos

Phew, get what im getting at LOL a tweaked SR20 appears to be no more repsonise then a std RB20 with the same turbo setup. So the first comparison i found doesnt do the SR20 chitter chatter much good

Im hunting around for a few equivelant turbo SR v RB20 comparisons. It appears that the weight of the average S13, combined with the gearing is probably proves more a factor then the additional stroke fo the SR20 in making it a more lively street car.?!?!?!

So Round 1 with SR20 vs RB20 with TD06 is a draw

Perhaps a win to the RB20 considering it doesn thave cams

[Bl4cK32]

you know the sr20 is a rb30 minus 2 cylinders there roy same stroke

[Roy]

It comes on like an animal thoough. Vver double the rwkws in just 600rpm

[Josh]

Plus if you swap to an SR you can get a killer V - mount setup Fella over here has just done one - looks mint - goes hard too - temps hardly budge at all

[Roy]

Yeh but from the results i have been looking at, the whoel SR being ouncjier then the RB20 is a crock. The RB20 doesnt have any trouble matching the power of similarily modded SR20s.

Be interesting of more ppl plotted torque on the right axis rather then A/R or psi

[Josh]

I'm in two minds at the moment... Whether to swap to a 25 if(when ) my 20 blows, or to keep the 20 and work the tits off it.. Its for drifting - a few of the guys over here have bulk power coming from 25's on standard internals.. so I dunno what I should do...

[Busky2k]

Roy, I think you'll find the S14/S15 SR20DETs with VCT spool the turbo a fair bit quicker than the S13 donk thanks to the added overlap in the midrange. Disable the VCT and the turbo becomes suprisingly alot more laggy...

Edited February 14, 2006 by Busky2k

[Roy]

LOL... then i want one of those HKS vatiable cam timing RB26 kits for the little RB20:)

Will be interesting to compare, a friend had a 230-240rwk S14 with Nizpro setup and its not overly different to my car to drive..though he did say his car did have a bit more urge if you were crawling up a hill at 2,500rpm in 3rd, so under load or light throttle could be worlds apart

[boostn32]

ok just an up date, the bottom end is nearly complete, just have to work out comp ration and order the head gasket.

[Cubes]

With regards to off boost accel.

Maxx's r33 RB25det felt as if it had the same low down urge as his s15 sr20det.

HOWEVER, the sr20 didn't feel as revy and the power band felt shorter due to the shorter 6speed ratio's.