R34 N1's Are They Supposed To Be This Laggy

[black sky]

Perhaps try another coat of fresh paint on the rocker covers?

I must say I've read through your specs list about 5 times now and the one thing I can't help but wonder is why you are only running 14psi?

the reason why i have not raised the boost anymore is because of the standard 444cc injectors as turning it up to 16psi saw it hit above 90 duty cycle

and jim said that it's best to run it safe so he turned it back down to 14psi

[black sky]

post up your IGN and INJ map

just view on the hand controller and punch it into an excel spreadsheet

should take you 5 minutes

then we can see your maps and see how its tuned

will give away lots of info

how do i do that???

Cheers

anthony

[djr81]

Get your hand controller & go through the settings menu to the maps. They are, like Baron said 20x20 maps. Just record the values in each box for each map.

[R31Nismoid]

You have a half baked setup

So expect half baked performance.

Until you get the accompanying mods to the turbos, then expect sub-standard performance from the setup.

Your chasing a problem that quite frankly doesnt exist.

The turbos are not "too laggy", they are working as you would expect with only half of the supporting mods.

Get the parts onto it as listed by Beer Baron and go for a proper/decent retune.

If you dont, then revert back to standard turbos as thats all your supporting mods are really good for

[paulr33]

main menu

SETTING

IGN MAP

then youll see a 5x5 view on the 20x20 map

so write those numbers down into an excel spreadsheet

then scroll to the right 5 times, so you start at row 6 (look at the top row for the row #)

and then keep doing that

until you cover all 20x20

[rev210]

With head porting and the ACL's you are perhaps well under the stock compression ratio? Do you have the CC's for the head and spec of the ACL piston used?

With a lower compression ratio you will drop the bottom end power off a tad and you will need more boost to make the same power. There is a little bit of swings and round abouts when you throw in head porting but, what the car is really needing is a set of camshafts for turbos that size.

You obviously also need to have some split dump pipes, I didn't see them mentioned. If you don't have them with those turbos you are looking at a bottle neck. The other thing to ensure is that you port matched the exhaust manifold for the turbo's exhaust housing entry.

600HP turbos should be matched with head work, cams , intercooler etc.. from an airflow perspective. Just like a turbo's map there is an island of efficiency for each of these components. Attempting to have them line up will always net you a faster and more responsive car.

You have lots of the good bits already but, bottom line is throw some injectors (700cc sards aren't bad), dump pipes and cams into that setup and it will be a very different animal.

[black sky]

You have a half baked setup

So expect half baked performance.

Until you get the accompanying mods to the turbos, then expect sub-standard performance from the setup.

Your chasing a problem that quite frankly doesnt exist.

The turbos are not "too laggy", they are working as you would expect with only half of the supporting mods.

Get the parts onto it as listed by Beer Baron and go for a proper/decent retune.

If you dont, then revert back to standard turbos as thats all your supporting mods are really good for

Hi nismoid

the reason why this thread was started was to see why the response i was getting from my turbos was different to other peoples experiences with similar setups even with bigger turbo's. Maybe you should use the search function and see how many people who own GTR's have a similar set up to me i.e no cam gears, they have injectors and are running higher boost but that fact doesn't change boost response which is what i was asking about. As you can tell i have done a search on it!!

and thanks for all your helpful responses

Cheers

anthony

Edited May 17, 2007 by black sky

[black sky]

With head porting and the ACL's you are perhaps well under the stock compression ratio? Do you have the CC's for the head and spec of the ACL piston used?

With a lower compression ratio you will drop the bottom end power off a tad and you will need more boost to make the same power. There is a little bit of swings and round abouts when you throw in head porting but, what the car is really needing is a set of camshafts for turbos that size.

You obviously also need to have some split dump pipes, I didn't see them mentioned. If you don't have them with those turbos you are looking at a bottle neck. The other thing to ensure is that you port matched the exhaust manifold for the turbo's exhaust housing entry.

600HP turbos should be matched with head work, cams , intercooler etc.. from an airflow perspective. Just like a turbo's map there is an island of efficiency for each of these components. Attempting to have them line up will always net you a faster and more responsive car.

You have lots of the good bits already but, bottom line is throw some injectors (700cc sards aren't bad), dump pipes and cams into that setup and it will be a very different animal.

Thanks for the reply. See i bought the car with all these mods done to it, i have the receipt for all the work that was done but i'm not to sure on specific details. but i just expected a GTR to push me back in my seat hard especially with 250 AWKW but it doesn't. i already have the plans to change the injectors and install cam gears but my power goal of 320-350 rwkw apparently doesn't need the dumps to be changed ( that's what my tuner says's) but i would love the increase in response if it would make a 300-400 rpm reduction in lag. And i really don't have the funds to install cams unfortunately i know that would make a huge difference but i spent all my money buying the car in the first place.

[Pauly33GTS-t]

just on the note of cam gears, what cam gears should R33'ers with a GT30R turbo be looking at in terms of getting a bit better response? series 2

Edited May 17, 2007 by Pauly33GTS-t

[black sky]

just on the note of cam gears, what cam gears should R33'ers with a GT30R turbo be looking at in terms of getting a bit better response? series 2

Cam gears are cam gears so you don't need the expensive jap brand cam gears as they all do the same job and they are interchangeable amongst the RB family so rb20 cam gears will fit rb25 and rb26 as well. not to sure about the rb30 though. Hope this helps

Cheers

anthony

[R31Nismoid]

Hi nismoid

the reason why this thread was started was to see why the response i was getting from my turbos was different to other peoples experiences with similar setups even with bigger turbo's. Maybe you should use the search function and see how many people who own GTR's have a similar set up to me i.e no cam gears, they have injectors and are running higher boost but that fact doesn't change boost response which is what i was asking about. As you can tell i have done a search on it!!

and thanks for all your helpful responses

Cheers

anthony

Like i said, half baked = poor results.

People with even bigger turbos wont be running them in a stock motor now will they?

All you are doing is running very large twins on a stock motor (for the sake of this conversation)

Head porting & exhaust, somewhat to do with it, but thats it.

Everything other item you have listed in your first post basically has nothing to do with response/power.

So direct comparison is utterly impossible until you start to match the parts everyone else has

As ive told you, apply some lateral thought to this.

1) Your not running half the parts everyone else is running, and they are using smaller turbos in a lot of cases

2) Your experiencing average performance

:sorcerer:

Item 1 & 2 are, funnily enough, directly related to each other.

:sorcerer:

For the fact your running those turbos on essentially a stock head, capacity RB26, those results are as good as you can expect

[rev210]

Thanks for the reply. See i bought the car with all these mods done to it, i have the receipt for all the work that was done but i'm not to sure on specific details. but i just expected a GTR to push me back in my seat hard especially with 250 AWKW but it doesn't. i already have the plans to change the injectors and install cam gears but my power goal of 320-350 rwkw apparently doesn't need the dumps to be changed ( that's what my tuner says's) but i would love the increase in response if it would make a 300-400 rpm reduction in lag. And i really don't have the funds to install cams unfortunately i know that would make a huge difference but i spent all my money buying the car in the first place.

If you have spent all your money for now , my advice is to leave the car alone and just keep it well serviced. A substancial increase in power will cost you in a substancial and on-going manner. 350rwkw is a fairly expensive proposition to maintain.

I think you need dumps if you don't have them, you will make more power.

14psi isn't much boost for N1's , that power isn't really shabby for the boost, they like to live at 18psi or so. If you add some cam gears you ought to be able to tweak the power curve.

[Angus Smart]

they like to live at 18psi or so.

But they really really really really really really really really loooovvvveee 1.4 - 1.6 bar

[XKLABA]

or so