RB26 Cam Question

[FLYSKY]

Cams will be bought on monday, first i wanted to go with JUN 264 cams with the GT-SS Kit but adam gots pretty nice Tomei 260° Poncams in stock so i couldnt resist hehe, so still needs my injectors and fuel pressure regulator and than my ecu can be mapped.

what do u guys think how much hp/torque i will get out of the RB26 with GT-SS Kit, 1.2 - 1.4bar pressure, 260° Tomei Toncams (9.15mm lift IN/EX) and 550/555cc injectors?

[GTR-Dad]

No doubt the -7 or GT-SS will spool earlier. Neither will spool as early as the OEM squirrels on my 335i and there's STILL a delay from when I 'punch it' and when my seat backs start to earn their keep.

If you want instant torque, you want a naturally aspirated engine. If you want a more flexible, tunable, scalable platform then forced induction is for you.

-7? -5? Both will be fun, but in different ways. Don't just think about it.... DO IT!

Dan

[cobrAA]

How often do you punch it at 2000 RPM? Most people downshift and the boost it almost instantly on for almost all the turbos... Well not the T88 and such. In there case you have to down shift again hehe.

downshift or not, I can REALLY feel a difference between gtss and -5. I felt both and yes the setup is pretty much the same except the turbos.

Even tho, you hit boost, with gtss you will be at 13psi at 3000 while the -5 might start boosting at 3-5psi.

[FLYSKY]

How often do you punch it at 2000 RPM?

in the City much more often than elsewhere.

[GTRADDICT]

How often do you punch it at 2000 RPM? Most people downshift and the boost it almost instantly on for almost all the turbos... Well not the T88 and such. In there case you have to down shift again hehe.

[cobrAA]

I'm lovin this thread lol!

[GTR-Dad]

Here's a chance to compare a -5 dyno curve....


Dan

[FLYSKY]

mine's did a 630hp car with GT2530 Turbo's

this was from HKS

[cobrAA]

i know HKS made about 574hp and 629Nm torque out of the GT-SS with light overbore pistons and 264° Cams so should i better go with JUN 264° IN/EX 9.15 lift cam's or 260° IN/EX 9.15 lift cams from Tomei with stock bore?

Isn't Mine's who did that?

[FLYSKY]

i know HKS made about 574hp and 629Nm torque out of the GT-SS with light overbore pistons and 264° Cams so should i better go with JUN 264° IN/EX 9.15 lift cam's or 260° IN/EX 9.15 lift cams from Tomei with stock bore?

[cobrAA]

-5 takes 500rpm more to hit the same boost as the gtss. so the gtss is quicker and yes you can feel that difference.

Will the gt-ss go up to 600whp ? Maybe is it easier to get 600whp with -5? yes. do you think your stock tranny will like that much power? no. so better stay at 500-550whp and both turbos can get you there.

One will be quicker the other will give more torque.

[allwheeldrifter]

i bought band new -5's from the states over the winter, and they came out to $2148 with tax, shipping, customs, etc....

[FLYSKY]

-5 would cost me about nearly 2000CAD without shipping and without customs but those would be new than, also should be a nice price but at the end i think it would cost about 2500 - 2650CAD or more with shipping and customs in Germany, used from UK i could getta set of -5 (include hard pipes, induction, stainless steel tubular exhaust manifold, stainless steel tubular elbows) for about 1950CAD used but still shipping cost would come extra.

but as used turbo's goes they r only available as long as someone takes them.

[GTRADDICT]

-5's!!!!!!!!

[FLYSKY]

from what i know is that the turbos r in good condition and doesnt need to getta rebuild, have minimal shaft play and run less than 20 000 miles.

but i still can't decide, should i take them or just wait to buy 2860R -5 in a few month, spool up to 7000rpm should be enough and 500 was the goal what i should get with the SS but a compare bitween GT-SS and -5 would be nice in a dyno sheet or so with same engine specs