LS 112 Stealth kit

[Uncle Tone]

Hi Ken,

I'm interested in the Stealth supercharger kit, after going for a ride in Tim Sheather's Maloo, equipped with the above.

I have a few questions. Firstly, what sort of rwkw should I expect from the conversion, bearing in mind that I have 1.8 roller rockers and the same exhaust as on Tims ute, which is twin 2.5's, opened cats, and 1.75 inch short 4 into 1's, if I use the 92mm throttle body and the VZ maf upgrade?

Secondly, what would happen if I used the stock injectors?

Thirdly, I wish to do the installation myself. I understand, by looking at the pictures, that the entire kit excluding the intercooler can be installed from the top of the engine bay. Is this right? Also, are the instructions issued with the kit comprehensive enough for a DIY'er to follow? Do you supply a base tune, or can it be driven carefully to the tuners?

Will I have to buy anything else to finish the install completely? Nothing worse than buying a kit and finding out that you need things to finish it.

Lastly, is there room for further increases given the blowers capacity? I may wish to add a cam and head package later on, or perhaps stroke the engine. I know that a cam and heads can be accommodated, but what about a stroked motor?

Also, why does the 75 and 80mm pulley kit void the blowers warranty? I understand that Tim had one of these fitted to his ute.

Thanks.

UT.

[Ken]

Hi Ken, I'm interested in the Stealth supercharger kit, after going for a ride in Tim Sheather's Maloo, equipped with the above.

Tim's Maloo is quite a weapon ... it's easy to understand why you want one !! ;)


Firstly, what sort of rwkw should I expect from the conversion, bearing in mind that I have 1.8 roller rockers and the same exhaust as on Tims ute, which is twin 2.5's, opened cats, and 1.75 inch short 4 into 1's, if I use the 92mm throttle body and the VZ maf upgrade?

It would be negligent of me to quote a figure as too many variables contribute to the ulimate performance. I assume it is pre-VZ since you mention the VZ MAF upgrade ... We typically see between 300 and 330rwkw on a VX-VY2 which has a suitable exhaust & modified air-box if running an LS112-92-IC with injectors & MAF upgrade. We have not seen less than 300rwkw on a well tuned sedan, but utes can be a struggle due to their inferior fuel system.


Secondly, what would happen if I used the stock injectors?

The standard injectors run out of flow (using standard pressure) at about 5200rpm with the LS112-92 kit. The engine will run lean, and possible expire after extended high-rpm runs, and produce significantly less power. It is a recommended thing ... good value at <$700.


Thirdly, I wish to do the installation myself. I understand, by looking at the pictures, that the entire kit excluding the intercooler can be installed from the top of the engine bay. Is this right? Also, are the instructions issued with the kit comprehensive enough for a DIY'er to follow? Do you supply a base tune, or can it be driven carefully to the tuners? Will I have to buy anything else to finish the install completely? Nothing worse than buying a kit and finding out that you need things to finish it.

We have had about 30% of our ~50 units sold go to DIY's. If you send an email to ken@harrop.com.au I will send you the instructions. The entire unit, apart from the intercooler radiator/pump is installed from above ... the whole job can be done in your driveway. It is reasonably easy ... as indicated by the sub-$1000 that is typically charged for a workshop installation.
We supply a conservative (base) tune that will be good for ~260rwkw that can be loaded by VCM-Suite or LS1-Edit ... (we will load it free of charge if you come by our facility), however we STRONGLY recommend a dyno-tune. It can be driven without the tune, but it will probably run a little rugged.
Everything excluding tools is supplied in the kit for a V2-VY installation. There is no requirement to cut any wires or drill any holes on a non-intercooled, but you do need to wire in the pump and route the plumbing on an intercooled (minor mods). We are still finding some odd variances with VZ & some HSV's. You will also need a fuel line release tool (Repco have them).


Lastly, is there room for further increases given the blowers capacity? I may wish to add a cam and head package later on, or perhaps stroke the engine. I know that a cam and heads can be accommodated, but what about a stroked motor?

I know of a least 6 installations on head-cam engines, and some are getting as much as 350rwkw... but that is not what this kit is designed for. By my calculations the LS112 will top out at about 365rwkw, and will only just feed a 383ci satisfactorly. In reality, at 365rwkw there are other engine components that will also need attention - crank/rods/pistons/pushrods etc.
That is why we are developing the TSK140 twin-screw unit ... should be available pre-Christmas but will need a more serious (stronger) engine to make use of it.


Also, why does the 75 and 80mm pulley kit void the blowers warranty? I understand that Tim had one of these fitted to his ute.

The kit is supplied with the 85mm pulley so that when the engine is on the limiter (6500rpm after tweaking), the LS112 rotors are also at their safe limit. By installing the smaller pulley we are over-revving the rotors and exceeding Eaton's recommendations.
Having said that, I have had the 75mm pulley on my car for >40,000kms and often revved it past 6750rpm (gone to 7200 twice, and once to 7500) and not had any damage. About 20% (~10 kits) of the installations are running with the 75mm pulley, and we have not had any failures ... yet. :D

What model vehicle ...?
How many km's has it done?
What do you use it for (daily drive?).
What are your expectations ... ?

Happy to help in any way you wish ...
Cheers ... Ken.
;)

[Uncle Tone]

Wow...thanks for getting back to me so soon!!

Tim's Maloo is quite a weapon ... it's easy to understand why you want one !! ;)
Oh yes........amazing power...... expensive package, though.

I assume it is pre-VZ since you mention the VZ MAF upgrade ... We typically see between 300 and 330rwkw on a VX-VY2 which has a suitable exhaust & modified air-box if running an LS112-92-IC with injectors & MAF upgrade. We have not seen less than 300rwkw on a well tuned sedan, but utes can be a struggle due to their inferior fuel system.
Yes, it is a pre-VZ....VY1 to be exact.

I assume that the 300rwkw car would be one that is completely standard, and the 330rwkw car would be a stock internal car with a good exhaust, headers, and maybe a 2 hole mod to the airbox?






The standard injectors run out of flow (using standard pressure) at about 5200rpm with the LS112-92 kit. The engine will run lean, and possible expire after extended high-rpm runs, and produce significantly less power. It is a recommended thing ... good value at <$700.
Wouldn't it be better to include it in the standard kit if there is a danger of the blower wrecking the engine without them?





I know of a least 6 installations on head-cam engines, and some are getting as much as 350rwkw... but that is not what this kit is designed for. By my calculations the LS112 will top out at about 365rwkw, and will only just feed a 383ci satisfactorly. In reality, at 365rwkw there are other engine components that will also need attention - crank/rods/pistons/pushrods etc.
That is why we are developing the TSK140 twin-screw unit ... should be available pre-Christmas but will need a more serious (stronger) engine to make use of it.
Tim said that his makes 390rwkw.....with more available if he changes the exhaust to twin 3 inch as there is 8 psi back pressure with the 2.5's.

He did say that the base engine which is a 222/224 cam and big valve heads would make 300rwkw on its own.....so I guess the blower adds about 100rwkw in this instance.

Would you say that 100rwkw is a fair enough estimation of what could be expected on any engine? e.g. a 200rwkw car goes up to 300rwkw, or a 250rwkw car goes up to 350rwkw?

What model vehicle ...? VY series 1 Clubsport R8 m6
How many km's has it done? 84,000
What do you use it for (daily drive?) Weekender, but would like to be able to drive it daily if I so choose
What are your expectations ... ? As much power as possible, I suppose.....I was hoping for more than 330rwkw.....

I reckon that 600 flywheel hp is a nice round number.... :D

Cheers mate. :D

[Ken]

Wow...thanks for getting back to me so soon!!
Oh yes........amazing power...... expensive package, though.
Yes, it is a pre-VZ....VY1 to be exact.
I assume that the 300rwkw car would be one that is completely standard, and the 330rwkw car would be a stock internal car with a good exhaust, headers, and maybe a 2 hole mod to the airbox?

Well ... no.
We have seen 320 from a completely standard, and we have seen 300 from a exhaust/airbox combo. This is why it would be silly of me to estimate. Some engines are stronger than others ... e.g. my V2 is exseptionally strong - consistantly better than 320 with only exhaust & airbox (but it did get new valve-springs at 50,000kms).
Some only just make the 300 ... others go more than 330 with the same mods & tune. :confused:


Wouldn't it be better to include it in the standard kit if there is a danger of the blower wrecking the engine without them?
That was our initial intention, but a lot of owners & installers complained that they were having to pay extra for components they already had. It seems that everyone (tuners) has their favorite injector (price?), so now we quote them seperately.


Tim said that his makes 390rwkw.....with more available if he changes the exhaust to twin 3 inch as there is 8 psi back pressure with the 2.5's. He did say that the base engine which is a 222/224 cam and big valve heads would make 300rwkw on its own.....so I guess the blower adds about 100rwkw in this instance. Would you say that 100rwkw is a fair enough estimation of what could be expected on any engine? e.g. a 200rwkw car goes up to 300rwkw, or a 250rwkw car goes up to 350rwkw?

Adding 100rwkw is a reasonable basis, but there are diminishing returns. I am suprised that Tim has got it to 390 ... the rest of the engine must also be very strong ... shows what can be done! I would not have expected a 300 NA to go to 390 ... I would have guessed 360. Tim's is possibly the exception, as he does a lot of other good tweaks as well as the LS112 ... it's impressive.

My guesstimates based on what we have experienced ...
200 -> 300
225 -> 320
250 -> 335
275 -> 347
300 -> 360

Your car has done a few k's, so it would be an absolute guess without a pre-fit diagnosis ... and even then only an educated guess.
You could be sure of an impressive daily drive with enormous torque that your wife could drive to the shops without stress, with a kit that can probably be transferred to your next LS1/2/6 vehicle, all in an affordable package that you can fit yourself. :D .
(.... Yeah ... I'm pretty proud of what we do ... ;) )

[Uncle Tone]

Well ... no.
We have seen 320 from a completely standard, and we have seen 300 from a exhaust/airbox combo. This is why it would be silly of me to estimate. Some engines are stronger than others ... e.g. my V2 is exseptionally strong - consistantly better than 320 with only exhaust & airbox (but it did get new valve-springs at 50,000kms).
Some only just make the 300 ... others go more than 330 with the same mods & tune. :confused:




Adding 100rwkw is a reasonable basis, but there are diminishing returns. I am suprised that Tim has got it to 390 ... the rest of the engine must also be very strong ... shows what can be done! I would not have expected a 300 NA to go to 390 ... I would have guessed 360. Tim's is possibly the exception, as he does a lot of other good tweaks as well as the LS112 ... it's impressive.
H'es done a heap of stuff in addition.....including V6 Supercharged injectors, and supplementary fuel pump, big valve heads, cam, etc. Still on the stock bottom end, though, with the exception of ARP bolts, etc.


My guesstimates based on what we have experienced ...
200 -> 300
225 -> 320
250 -> 335
275 -> 347
300 -> 360

This is interesting, I assume that its only the blowers capacity restricting the power gain?

If the n/a power is higher, the gains are lower. I suppose the little huffer can only supply a certain amount of air.


Your car has done a few k's, so it would be an absolute guess without a pre-fit diagnosis ... and even then only an educated guess.
You could be sure of an impressive daily drive with enormous torque that your wife could drive to the shops without stress, with a kit that can probably be transferred to your next LS1/2/6 vehicle, all in an affordable package that you can fit yourself. :D .
(.... Yeah ... I'm pretty proud of what we do ... ;) )
It seems to still be making about 260rwkw when it had a check run about 5000km ago.....so by your reckoning I should get about 340rwkw. If I add the 222/224 cam I may get about 350rwkw. I am holding you to these figures.










....... :lol: :lol: :lol: Only joking! :lol: :lol: :D

email on the way....look forward to reading the instructions.

Thanks Ken. :cool: