1jzgte/2jzgte stock twin turbo power gains

[2jayzgte]

Dyno was a direct comparison from the last time the car was on the dyno.

I'm guessing they would have had multiple runs today it would'nt have been one and done I'm pretty sure they would have had min 3 or 4 back to back runs.

I have'nt driven it yet but it will be getting a run on Sunday.

To be honest as I mentioned to make the gains mentioned I think the turbo's have to be able to push more air which I personally think they can't.

We didn't change the boost or anything I guess if you come on Sunday you can have a look over it.

Basically we replaced the back pipe from the original pipe off the back turbo and hadf a flanghe made with a individual pipe off the front turbo

[Snaps]

Could be due to a lot of things... different temperature, humidity, etc. Coryn. Have you changed anything else since the last run? What setup were you running before?

If you were running the stock airbox, I could see the twin intakes losing power over it - but only if the intakes haven't been closed off (cold-air box) from the hot engine bay air, I think that would be one of your problems if that's how yours is set up?

[2jayzgte]

Could be due to a lot of things... different temperature, humidity, etc. Coryn. Have you changed anything else since the last run? What setup were you running before?

If you were running the stock airbox, I could see the twin intakes losing power over it - but only if the intakes haven't been closed off (cold-air box) from the hot engine bay air, I think that would be one of your problems if that's how yours is set up?

Could also be due to the fact the BPU mods I already have may have already maxed out the potiential of the turbo's.I personally think after going over previous dyno sheets its the turbo's they just can't move any more air.

I have'nt had a factory airbox for 8 years..The twin intakes in principle sound like a great idea and the theory of providing a seperate intake per turbo is also sound fact of the matter is though you still have to get air in to make more power here in is where I believe is what I have run into I believe at the moment the way my boost curve is setup I think I'm focused on what happens in the middle of the rev range not up at the top.

I have also noticed this at the track after about 6000 rpm these turbo's just run out of puff but between 3-6 they are really good though see this is the trade-off while making more power up top is great the fact of the matter for me anyway what goes on between 3-6 is more important to me.

[Mr Ree]

Exactly ^ as you are spending 90% of your time in that rev range

[BlakeNZ]

Obviously, I am very disappointed with this result.
The thing that pricks my attention, is that the boost did not increase, whereas many cars (with the twin intake mod) have experienced boost increase(2-3psi) without touching the boost controller, which shows that the turbos that increased boost were being restricted on the intake side... whereas the fact that Coryn's boost did not increase, suggests that this is not the case on his car.
It could also mean that his exhaust side is restricted, so got no further power gains,BUT I THINK THIS IS UNLIKELY, given that the car makes great power already, so is unlikely to be restricted.

[2jayzgte]

Obviously, I am very disappointed with this result.
The thing that pricks my attention, is that the boost did not increase, whereas many cars (with the twin intake mod) have experienced boost increase(2-3psi) without touching the boost controller, which shows that the turbos that increased boost were being restricted on the intake side... whereas the fact that Coryn's boost did not increase, suggests that this is not the case on his car.
It could also mean that his exhaust side is restricted, so got no further power gains,BUT I THINK THIS IS UNLIKELY, given that the car makes great power already, so is unlikely to be restricted.

Initially I was disappointed but I don't regret giving this mod a crack.

Personally the only way I see getting any more power out of this turbo setup is looking at a new manifold or doing something to de restrict the factory manifold which to be honest won't happen.

All I no is I'll probably drive round with the car how it is now then in a month or so have a whole lot of parts for sale lol...lol..

I got 2 brand new Blitz intakes F?S though if anyone is interested one is a SUS power filter which is 2nd hand direct bolt up to your old intake and the other is a Blitz LM intake brand new never used still in the box.If anyone is interested in either PM me.

You gotta laugh what else is there...

[Snaps]

Could also be due to the fact the BPU mods I already have may have already maxed out the potiential of the turbo's.I personally think after going over previous dyno sheets its the turbo's they just can't move any more air.

I have'nt had a factory airbox for 8 years..The twin intakes in principle sound like a great idea and the theory of providing a seperate intake per turbo is also sound fact of the matter is though you still have to get air in to make more power here in is where I believe is what I have run into I believe at the moment the way my boost curve is setup I think I'm focused on what happens in the middle of the rev range not up at the top.

I have also noticed this at the track after about 6000 rpm these turbo's just run out of puff but between 3-6 they are really good though see this is the trade-off while making more power up top is great the fact of the matter for me anyway what goes on between 3-6 is more important to me.

Was just asking to get some more info Always interesting to hear how other people go about doing things like this. You've got the twin intakes in a sealed (from engine bay air) cold air box as well?

It definitely makes sense your turbo's are running out of puff (I'd guess on the compressor outlet side) if the power is still dropping out at the top end...

You're running the US Spec cams right? I'd say they could be choking your motor in the top end, and would probably be your next best bet if you're looking for a little more power. But that's only if you've got some sort of Air/Fuel controller (piggyback, etc.) to take full use of the extra flow in the top end.

Either way I'm sure the car still runs great, and I'm sure you're still more than happy with it!

[2jayzgte]

Could also be due to the fact the BPU mods I already have may have already maxed out the potiential of the turbo's.I personally think after going over previous dyno sheets its the turbo's they just can't move any more air.

I have'nt had a factory airbox for 8 years..The twin intakes in principle sound like a great idea and the theory of providing a seperate intake per turbo is also sound fact of the matter is though you still have to get air in to make more power here in is where I believe is what I have run into I believe at the moment the way my boost curve is setup I think I'm focused on what happens in the middle of the rev range not up at the top.

I have also noticed this at the track after about 6000 rpm these turbo's just run out of puff but between 3-6 they are really good though see this is the trade-off while making more power up top is great the fact of the matter for me anyway what goes on between 3-6 is more important to me.

Was just asking to get some more info Always interesting to hear how other people go about doing things like this. You've got the twin intakes in a sealed (from engine bay air) cold air box as well?

It definitely makes sense your turbo's are running out of puff (I'd guess on the compressor outlet side) if the power is still dropping out at the top end...

You're running the US Spec cams right? I'd say they could be choking your motor in the top end, and would probably be your next best bet if you're looking for a little more power. But that's only if you've got some sort of Air/Fuel controller (piggyback, etc.) to take full use of the extra flow in the top end.

Either way I'm sure the car still runs great, and I'm sure you're still more than happy with it!

US/UK spec cams HKS F-Con V-Pro piggybacked off the factory ecu.

It will also depend on how you have your boost setup if you still are using pretty much the same curve as factory then yes I think a set of cams could well get you some gains but if you have the boost all in at the crossover like I do I think cams won't gain you anything.

Mate you'll still run into the same problem I feel your just moving the choke point.The issue will always be the turbo's.I don't no how the US guys are doing it wheather Dyno-jet dyno's a jacked up or what but apparently I have heard as much as 15% higher than our Dyno's we use so there 500 + HP dyno figures have me shaking my head.

Outside of running e85 or something along those lines and even then I call BS 500+ on the factory turbos'.

[Lith]

Comparing dyno results can be real tricky, gotta remember you are running through an auto which would be killing some of the party - no idea how much. One way or another, your car clearly goes really well and it does seem like you're pushing near the limit of what you're going to make without changing either the fuel or the turbo setup.

[Mr Ree]

Having already gone this far, I would look at doing the hotside piping too.

Whats the worst that can happen?

Atleast then if it doesnt give the gains we all hoped for, you will be able to sell the complete kit for dual intakes and dual hotside piping, with all the filters and bits n pieces.

It would be a great purchase for someone who hasnt pushed their set up as much as yours.

Again, big ups for giving it a go mate

[BlakeNZ]

you have the USA spec turbos don't you?

[2jayzgte]

you have the USA spec turbos don't you?

Yep thats correct US Turbo's.

[2jayzgte]

Comparing dyno results can be real tricky, gotta remember you are running through an auto which would be killing some of the party - no idea how much. One way or another, your car clearly goes really well and it does seem like you're pushing near the limit of what you're going to make without changing either the fuel or the turbo setup.

Thats true mate but 500+ on factory turbo's to me is a reach you surely can't think thats for real can you??

The most I have seen with my setup and a 6 speed is just a touch over 300 KW on a Dyno dynamics type Dyno which would be equal to about 440-450 odd at the fly wheel if you take thaT SUPPOSED 15% higher reading dyno's in the US well there goes your 500 + HP reading thats the only way I could figure it.

[Lith]

Thats true mate but 500+ on factory turbo's to me is a reach you surely can't think thats for real can you??

Never said it would be for real, if anything quite the opposite - I was going to be truly amazed if you made a substantial amount more than you were. I was half implying that some dynos may read higher - and when you add the fact yours is auto etc, you can't really use what people are getting in the States with different fuel, different dynos, different transmission as something to set expectations for here.

[2jayzgte]

But my point still stands mate these turbo's will reach a stage where they'll flow X amount and then she's done there is nothing else that can be done to make the stated number as the turbo's will be the choke point.

I have no doubt that these Dynapack numbers are more closely related to flywheel numbers anyway.The best ever number my car has done on a Dynapack less the F-Con was 322 KW at Chequered Flag..The best it has done at STM is 315 KW so yeah I mean I don't no how different Andre or Richard had there Dyno's calibrated but I guess there is a difference that you have mentioned.

[Mr Ree]

I would think that that the small difference would come down to temperature and/or humidity on the day.

They are very close to each other either way.

[Lith]

There are different correction types (and where the temp correction sensor is mounted) and a variety of other bits and pieces which will affect it, which is why I stuck to the "It clearly goes really well" thing

Coryn - not sure why you are drumming that the turbos will be maxed out idea to me, I've kinda suspected that would be the case since before the test... it might make different numbers measured different ways, but as you say - the turbos may well be moving as much air as their can. If you want to make it quicker, you may be restricted to changing the turbo setup or changing the fuel type. Even water/meth injection would probably help if you wanted more without a HUGE change.

[Stott69]

Have we got any pics of this mod in place?

[2jayzgte]

Haven't got pics sorry but a few guys saw it in Palmy today they may have pics.

Ok so I've driven with this mod now and I have to say outside of the extra whoosh here in there I think there maybe a little spool benefit the car seemed to come on song a little better from about intial 2000-3000 rpm area just seemed a little crisper.

Nothing though up top gave it a couple of bursts upto 200 kph on the way home and I have to say the car was very similar to what it was I could'nt with 100% certainty say it was better than it was.

[2jayzgte]

Kit has been sold Good Luck Luke hope it does more for you than it did for me.