Simon,straight up question mate,how laggy are your T28s? Is there much between stock?

Hello.

 

I'm Si's forum secretary... (sit on his desk, stockings n' all, geddit?).

I've jus txt'd to let him know that it would be nice if he replied to you sometime...

P.S. what is laggy and what are T28's?

:o)

LOL. :D

Lmfao

bigger tubs have bigger lag, unless ball-bearing ones

bigger tubs have bigger lag, unless ball-bearing ones

 

 

But smaller BB turbos will have less lag than larger BB ones. ;)

But smaller BB turbos will have less lag than larger BB ones. ;)

 

unless they are misubishi turbos in which case they are just better made and dont need ball bearings :tongue:

Oooooh.... I LOVED the size of those pistons!

 

... but I bet mine's got the biggest lag of all...

 

=oD

OMG! :eek: Leave my big piston out of this woman! As for the size of my balls... best not go there ;)

 

Thinking about it, one of my T28's is probably bigger than your entire engine :) 600 CC indeed :p

 

Anyway, lag... yes, there is a bit, but it's not like you'd think. It's not like the revs are charging away and boost is horribly far behind. If anything, looking at Crazy_Eds boost gauge, it's hitting target boost before the engine's really ready to do anything with it. Mine don't work like that. It gradually comes up making more and more power as it goes. TBH, I don't know the exact figures, but I reckon it must start coming on at sub-3K then go on to make 20 PSI at 5K-odd. I need someone... probably someone small and light (that's you, Miss Thing)... to point a camcorder at my RPM / boost gauges for a better idea really.

 

Oh, these are SE supplied Garrett T28's I'm talking about.

Ok Thanks Si;)

 

It's just that a guy in the US said this.........................................

 

 

 

 

TD05-18G's and T25-28's = Man... definitely surprised me... I knew the T25-28 lag wouldn't be all that great, but to be the same as a turbo making almost 50% more horsepower is simply not acceptable.

 

 

Just not sure I beleive it :rolleyes:

He doesn't sell Greddy tubs for a living, does he?

Ok Thanks Si;)

 

It's just that a guy in the US said this.........................................

 

 

 

 

TD05-18G's and T25-28's = Man... definitely surprised me... I knew the T25-28 lag wouldn't be all that great, but to be the same as a turbo making almost 50% more horsepower is simply not acceptable.

 

 

Just not sure I beleive it :rolleyes:

 

Bear in mind that the t25-28 was probably running off stock maifolds, still...........................................

 

bring on the mitsubishi's :dance: :dance: :dance: :dance: :dance:

 

I would still like to see a direct comparrison with a decent garrett roller bearing turbo something the HKS 2835R on a set of pentroof manifolds against the Trust TD 06- 20G on the same set up.

 

If anyone sees one let me know.

 

Regards,

 

alex

He doesn't sell Greddy tubs for a living, does he?

 

if it is bernie yes he does :D

 

mind you has HKS 2530's on his zed and he does sell HKS garrett turbos

 

Regards,

 

alex

if it is bernie yes he does :D

LOL! :D

 

OK, minor point... he's talking T25-28's... so that's a T25 housing hybrid'd with T28 compressor, right? I've got T28's. What'd that be then T28-28's?! Standard fanny-mould, of course.

LOL! :D

 

OK, minor point... he's talking T25-28's... so that's a T25 housing hybrid'd with T28 compressor, right? I've got T28's. What'd that be then T28-28's?! Standard fanny-mould, of course.

 

Yea so that means.................................................

 

A stock tub on stock manifolds has the same lag as a TG0518G with Greddy Manifolds?????

Yea so that means.................................................

 

A stock tub on stock manifolds has the same lag as a TG0518G with Greddy Manifolds?????

 

No, look at the dyno comparison on TT net. All the aftermarket turbos make considerably less power than stock untill > about 4-5krpm with the exception of sport 500's, 530's and PE1420's. 18G's overtake stock at ~4.5k, but at 4k they make nearly 100bhp less. I'd imagine they're going to feel pretty laggy until 5k, after that they just take off. Biggest problem I can imagine you'll have is if you need to lift once they're spooled they'll take a while to get going again.

No, look at the dyno comparison on TT net. All the aftermarket turbos make considerably less power than stock untill > about 4-5krpm with the exception of sport 500's, 530's and PE1420's. 18G's overtake stock at ~4.5k, but at 4k they make nearly 100bhp less. I'd imagine they're going to feel pretty laggy until 5k, after that they just take off. Biggest problem I can imagine you'll have is if you need to lift once they're spooled they'll take a while to get going again.

 

Thats *****CKS John I asked Nico :bow: :bow: :bow: Infact you saying lag until 5k is just plain stupidness :rolleyes:

 

The other point is a HKS 2530 does not have a great deal of lag

 

look here............................

 

TD-05 vs Gt-2530

I was luck enough to drive one Z for about a month with Greddy TD 05 and I must say it was very surprising to how driveable those turbos are. They spool up almost like stockers about 31-3200 rpms and very smooth I'm sure it's due to the manifolds that come with it.

 

As for the HKS Gt 2530 I got to drive 2 cars with them on and it was fun. They started to spool up around 34-3600rpms but unlike the smooth spool up like the TD-05 it was more like a jolt.

 

In my opion both turbos are very good upgrades but if I had a choice I would go with the TD-05 because of the smooth spool up and quicker response. Maybe one of my other friend will get the other turbos listed here and I could compare more

I'm not saying there's nothing until 5k, I'm saying that until 4.5k they make less power than stock, so until you get past that point it'll feel slower than it is now. Look at the chart you posted a while back and took the quotes from, it's pretty clear. They might be spooled in as much as they're making +ve boost by then but you can't expect a turbo that size to spin up as quick as stock. You should be helped by your management system and the fact the inlet tract is a bit more open with no MAF's. Has Nico got these on his?

 

2530's might not have a great deal of lag, but it's still more than stock, again check the charts out. With good manifolds they might be close ...

Guess really you'll just have to wait and see how it goes once it's finished.

Ok how about this............................

 

When the car is ready I will show you how it will compare to stock turbos and 555s.Lets just see how long the stock turbo car stays infront.;)

LOL, on the other end of the rope all the way back to silvia SE nisstek engineering. :D

LOL, on the other end of the rope all the way back to silvia SE nisstek engineering. :D

 

 

:nono: :xxx: :tongue:

OK so my 2 penneth

 

if you are talking about the feeling of the car what you can feel is the increase in bhp. so the steeper the curve the more it kicks you in the butt. also bear in mind the dyno is a comparrison against a stage 5 car not a stock car.

 

graph created by bernie at ooparts - cheers bernie http://www.ooparts-international.com/

 

On that graph you are correct until about 4400 rpm the bhp figure is less - however look at the steepness of the curve - it is because all of the power is lost very low down - once it goes on positive boost at about 3,500 rpm the torque curve rises really quickly - that is where you will get your "feeling"

and the "feeling" will continue way way past 4400 rpm the 18g looks like you will be getting "feelings" all the way up to 5,800

 

infact i'm getting quite excited just thinking about it :dance:

 

Regards,

 

alex

Couldn't agree more, it will feel great when it comes in, but the fact remains until you get up to high revs the stock still produces more power. The steepness of the curve is what you feel as 'spoolup' ie rate of change of torque. You've still got a fairly narrow power band to work with at the end of the day, so it'll be hard work to keep it spooled up on a tight road - i'd imagine with the sort of power it's going to be making that traction will become a big issue when it starts to spool too.

 

Mac, why try to turn this into a competition?! Obviously it's going to be quick, and I wish you the best of luck with it. It's horses for courses mate. Oh, and cash too ;)

Oh, and cash too ;)

 

 

:cry: :cry: i used to have money

 

Mac, why try to turn this into a competition?! Obviously it's going to be quick, and I wish you the best of luck with it. It's horses for courses mate. Oh, and cash too ;)

 

 

LOL John I am not turning this into a competition I am willing to show you how drivable my car will be nothing more and nothing less.Look what you imagine to be right,I am willing to prove your imagination to be wrong:D;)

 

 

No, look at the dyno comparison on TT net. All the aftermarket turbos make considerably less power than stock untill > about 4-5krpm with the exception of sport 500's, 530's and PE1420's. 18G's overtake stock at ~4.5k, but at 4k they make nearly 100bhp less. I'd imagine they're going to feel pretty laggy until 5k, after that they just take off. Biggest problem I can imagine you'll have is if you need to lift once they're spooled they'll take a while to get going again.

Lets hope so!