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Marko R1

By Marko R1,
in Engines & Forced Induction

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Marko R1 Grand Master

Marko R1

Posted
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rob at rips is running an rb26/30 with factory block and crank making over 1350hp in his 7sec car, he is actually trying to break it but he said it just wont, this engine was built about 3yrs ago :laugh: if its good for rips its good for me

paul is right, its a street driven car

zebra Grand Master

zebra

Posted
Posted
a 26 block is better then a rb30 talking about the block here not the crank size but you guys will be seeing alot more rd28 set ups with 3.4 cranks soon enough

What a great idea an RD28 block would be....an extra 40kg over the front axle on the already front heavy GTR, plus the 5 grands worth of block prep needed to make it fit.

As Marko said its a street car and theres nothing wrong with the dirty 30.

We need vids Marko!

Marko R1 Grand Master

Marko R1

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What a great idea an RD28 block would be....an extra 40kg over the front axle on the already front heavy GTR, plus the 5 grands worth of block prep needed to make it fit.

As Marko said its a street car and theres nothing wrong with the dirty 30.

We need vids Marko!

lol - i couldnt agree anymore!

re. the vids...it wont be long, i have a new sony handycam hd which i need to put to the test, it has a youtube upload function :angry:

SimonR32 Grand Master

SimonR32

Posted
Posted
i replotted my 3rd and 4th gear over each other last night and it looks nothing like that...one line is just under the other...ill scan it for you if you like.

scan0003q.jpg

clearly both these runs were conducted in the same gear... the dyno operator has just made a mistake and not entered the right gear into the program

you would be ignorant to think otherwise ;)

R.I.P.S NZ Collaborator

R.I.P.S NZ

Posted
Posted
clearly both these runs were conducted in the same gear... the dyno operator has just made a mistake and not entered the right gear into the program

you would be ignorant to think otherwise :thumbsup:

Mmmmmmmm, not sure about that mate, we've done back to back dyno runs in 4th and 5th gear and got almost identicle power curves, within 3-5whp or so.

Rob

9krpm Mentor

9krpm

Posted
Posted (edited)
Mmmmmmmm, not sure about that mate, we've done back to back dyno runs in 4th and 5th gear and got almost identicle power curves, within 3-5whp or so.

Rob

Remember that we are assuming the power loss (drive train and traction) between the gears are constant with these discussion. Obviously if they read the same at every single vehicle speed, it just means that you lost power in one of the run.

That is completely different to comparing response between a 3rd gear power run with another 4th gear power run.

Or in some case, I've seen people compare 2 different cars.

Why did I get drag into dyno comparison talk in the first place. Dyno is just a tuning tool :whistling:

Edited by 9krpm
Beer Baron Grand Master

Beer Baron

Posted
Posted

the curves will be the same basic shape but when speed is the bottom axis there is no way one of those runs could be in 3rd and one in 4th.... doing the run in different gears moves the curve along the graph. so the lower the gear of course it will make more power at a given km/h. peak power should be the same, but not at the same speed in every gear. otherwise you'd have a gearbox full of the same gears!

SimonR32 Grand Master

SimonR32

Posted
Posted (edited)
the curves will be the same basic shape but when speed is the bottom axis there is no way one of those runs could be in 3rd and one in 4th.... doing the run in different gears moves the curve along the graph. so the lower the gear of course it will make more power at a given km/h. peak power should be the same, but not at the same speed in every gear. otherwise you'd have a gearbox full of the same gears!

BINGO :):);)

glad someone else has a brain !!!

Edited by Cerbera
sky30 Mentor

sky30

Posted
Posted
Apoligies for giving an example with someones name in it...that was maybe a little too much. (mods please edit name out)

Calling my engine a drag engine is like me calling yours one.

Show me an aussie built RB 30 thats so much more outstanding than what ive got. Im building one to see what all the fuss is about and see if it will actually make what ive already got better. I think the big turbo may enjoy a bit more air...so we will see what just changing the bottom end will achieve.

You were off the mark refering to my engine as a drag engine 9K...that was the point...you have no idea what went into it and how it was put together. The focus when building was to make the engine make as much low down grunt (torque) as possible with the GT-RS turbo's. The reason for this is im making zero boost at the startline as i was using a normal Power FC with no anti-lag, two step etc. When the clutch was popped the car had to be right in the meat of its torque curve pulling the car hard off the line. This resulted in the awesome 60' times which was the real secret in getting a car with limited power into the 9's...it was 60'ing faster than Kier's car with less power and more weight (1470kg) and it didn't need an OS Giken 3L to do this. Only Mark Jacobsen has 60'd a GTR on radials faster than what our car has. A high revving RB26 that has a big flat 5000rpm torque curve is what most circuit guys would kill to have.

Thanks

Paul,

What 60' Times were you getting to get into the 9s with that set-up?

D_Stirls Veteran

D_Stirls

Posted
Posted (edited)

I have a quick question about the Garrett turbo range.

Someone said that the GT-RS (GT2871R 52T i.e. -10's) turbos are still too laggy on the a 3 litre. What i was wondering is if anyone has used the smaller of the GT2871R turbos (the 48 trim) on either a 26 or 30.

They are placed in the middle of the GT28RS (-5) and the GT2871R 52T (-10) yet i have not seen anyone using them, it seems when people want a bigger turbo than a -5 they go straight to the -10, when the 48T is also an option.

This is the turbo i'm talking about, obviously it will need a custom compressor housing.

http://www.turbobygarrett.com/turbobygarre...1R_743347_1.htm

Edited by D_Stirls
Marko R1 Grand Master

Marko R1

Posted
  • Author
Posted (edited)

come to think of it - mark berrys hi octane r32gtr with rb26 was running gcg modified garrett -5s which cracked over 400awkw as shown on the ignition dvd:

5ugygn.jpg

im not sure if he is running the same turbine setup on his new rb30 r34gtr:

o0dmjd.jpg

...maybe somebody like beerbaron would know this as i think he is well versed in the circuit racing scene

Edited by Marko R1

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