Definitive Guide To Building 300-330awkw Gt-r

[SimonR32]

Even better (I didn't realize he had the car on a dyno dynamics with the -7 set up)...

164rwkw @ 4500rpm

205rwkw @ 4500rpm

From other graphs on dyno dynamics his set up does look down by 40odd rwkw at 4500rpm but that still does not cover the 100hp it has improved with the 35R

[N1GTR]

Here's a decent -7 result, more boost could've been used but stayed conservative (98 BP PULP);

This is a silly comparison anyway, a 35R is designed to make more power than 7's ever will so of course its going to seem lazy and have a bigger top end. Anyone who doesn't understand that should give up modifying cars right now.

[Harey]

This is a silly comparison anyway, a 35R is designed to make more power than 7's ever will so of course its going to seem lazy and have a bigger top end. Anyone who doesn't understand that should give up modifying cars right now.

But the previous dyno graph shows the 35R has more response and more top end over the -7s??

[N1GTR]

Even better (I didn't realize he had the car on a dyno dynamics with the -7 set up)...

164rwkw @ 4500rpm

205rwkw @ 4500rpm

From other graphs on dyno dynamics his set up does look down by 40odd rwkw at 4500rpm but that still does not cover the 100hp it has improved with the 35R

Do you have the 35R one in RPM vs boost?

[SiR_RB]

i know it may sound like a "how long is a piece of string" question but how much boost would you run on a healthy standard internal rb26 with -7's? im currently at 19psi @ 296rwkw, thought 20ish psi is the safe limit? and you cant run much more then 21-22psi? on pump fuel ofcoarse...

[N1GTR]

But the previous dyno graph shows the 35R has more response and more top end over the -7s??

You mean the one where we know the setup wasn't running properly?

[SimonR32]

You mean the one where we know the setup wasn't running properly?

Your "decent" -7 set up is making 25rwkw more at 4500rpm that the one that "wasn't running properly". Funnily enough the GT35R makes 74rwkw more at the same rpm...

[zebra]

gt35R one also has cams added

[N1GTR]

Your "decent" -7 set up is making 25rwkw more at 4500rpm that the one that "wasn't running properly".

Yeah great - so that's agreed

Funnily enough the GT35R makes 74rwkw more at the same rpm...

Maybe i've missed something here (and it's looking that way), but explain please how you got 74rwkw difference between the two at the same rpm - I simply cant see where the numbers come from for this 35R.

Do you have the graph in RPM vs Boost please?

[SimonR32]

Maybe i've missed something here (and it's looking that way), but explain please how you got 74rwkw difference between the two at the same rpm - I simply cant see where the numbers come from for this 35R.

Do you have the graph in RPM vs Boost please?

At 4500 the -7's are making around 210hp (157kw) and the GT35R is making around 320hp (239kw), so it's actually more like 82kw.

No idea about boost vs RPM, it's snozzle's graph so maybe ask him

Edited October 11, 2011 by SimonR32

[N1GTR]

At 4500 the -7's are making around 210hp (157kw) and the GT35R is making around 320hp (239kw), so it's actually more like 82kw.

No idea about boost vs RPM, it's snozzle's graph so maybe ask him

Ah ok now I see where.

Lets compare that 35R result vs the one I put up then, the 35R is close enough to 239kw and the 7's are close enough to 230kw.

So for a bolt on set of turbos, vs new oil and/or water lines, dump pipe, exhaust manifold, intake piping, turbo to FMIC piping etc, with a goal of 300 odd rwkw (remembering which thread this is), the 7's win on cost while they come in an ever so slight second place to power in midrange.

A 35R will go so much further power wise than the goal of this thread, so IMO for 300 odd rwkw throw a set of 7's on at 23/24psi and with the other basic supporting mods the owner is there.

EDIT: Checking my last graph, i'm at a touch over 260rwkw at 4500rpm with the EBC turned off. Hooray for low end

[zebra]

mine makes 150 @ 6400

[Hadouken]

I really want -7's now :S

[levinboy]

I really want -7's now :S

-9s

[SimonR32]

Ah ok now I see where.

Lets compare that 35R result vs the one I put up then, the 35R is close enough to 239kw and the 7's are close enough to 230kw.

So for a bolt on set of turbos, vs new oil and/or water lines, dump pipe, exhaust manifold, intake piping, turbo to FMIC piping etc, with a goal of 300 odd rwkw (remembering which thread this is), the 7's win on cost while they come in an ever so slight second place to power in midrange.

A 35R will go so much further power wise than the goal of this thread, so IMO for 300 odd rwkw throw a set of 7's on at 23/24psi and with the other basic supporting mods the owner is there.

EDIT: Checking my last graph, i'm at a touch over 260rwkw at 4500rpm with the EBC turned off. Hooray for low end

I would be going a 3076R for 300rwkw and you would only need 19psi They are so much better than a GT35R!

Plus I think you will find the cost comparison would be fairly similar, how much do you think it would cost from filter to cat to get the twins going?

Checking my last graph I'm at around 270rwkw at 4500rpm with 500cc less that you

[Count Grantleyish]

-9s

+1 really miss my old GTR which had pair of -9s.

[dori34]

are the -9s really that much better then the -7s?

[MrStabby]

are the -9s really that much better then the -7s?

If you only want 300kw, then the extra $400 for the -9s is a waste of money. If you want to go past 320kw, then they're the right choice.

[Count Grantleyish]

are the -9s really that much better then the -7s?

I've had both, I prefer -9s over -7s. Some say it may make no difference but if I were to buying another turbos I'd go for -9s.

[dori34]

ive checked the specs on -9s and -7s and they're identical apart from the comp wheel & trim.

so for example if at 19psi, the -7s will make 290kw, what will the -9s make on the same boost?

is the -9s the same response as the -7 or slightly laggier?