it is an IS350

 

Anyone know how much ans the details?

 

roughly 6k but there only litterally only a handfull of usdm IS's boosted

 

LMS sold a kit a few years ago. 5 psi of boost for about $6000. Folks reported around 50 hp gain at the time.

Since that's $120 per hp almost nobody bought one, and LMS stopped selling them.

Most estimates of total kits sold are around 5, and everyone since then has just been folks buying those same 5 used LMS kits for the most part. Presumably for a lot less than $6000 in most cases since they're used, so I suppose those folks are getting a bit better bang/buck.


TOMs sells a kit for JDM models for around $10,000 that runs slightly higher (about 5.8 psi) but doesn't sell it for US models since they can't touch the us ECU and they require programming for 100 octane fuel. There's one guy in the UK who imported a JDM IS350 and runs this kit but again, gains aren't impressive for the cost (even less impressive per $ than the LMS kit).



Since then many folks who claimed they were developing a supercharger or turbocharger kit, but nobody has managed to actually bring anything to market, and pricing is always talked about in the $6000-8000 range... and boost remains severely limited by the high compression of the engine.

Well, there's the guys in S. africa who claim $7000 for their IS250 kit, but other than whoever they prototyped it with I'm unaware of anyone who has one, and their numbers never made any sense when they provide them. (apart from it not making much sense to spend $7000 to blow a 250 versus spending $3850 to get an IS350 instead for folks in markets where the 350 is sold)

 

John is running 7.5 pounds of boost. Over the original 5 pounds

I am running 6 pounds ... Soon to be 7.5 aswell once we figure out this tiny problem running at that boost level.

And we both paid less then 5k so its def worth it to be faster than any other is350 out there

Will post those vids n pic when I get my car back

 

Kinda curious what the tiny problem at that boost level is.

(his running 7.5 is odd too, as he claimed he didn't change his pulley to go from 5 to 7.5, he just changed his intercooler... which has other implications... Lance asked him where he's measuring boost but I never saw a reply to that)

I dunno if you guys are checking your AFRs while upping the boost or anything, but I hope so.... the 7 psi max for the motor was some math Lance ran a while back, so you'd have to check with him... I imagine it was based on the cylinder pressures given the static compression but not sure)

 

well around 7.5 of boost at 3rd gear and up theres a fuel problem.(which isnt too safe) so we are tryin to fix that , need a way to get more fuel


and im not too sure where hes measuring his boost youd have to ask him lol
once we figure it out im gonna up my boost level too but to the safest level my engine will alow me .. which im assuming is around 7 psi

 

If you only changed the intercooler and measured a boost increase, I have my doubts about what really caused the higher number. It all depends on where you're measuring boost, and whether your numbers are temperature compensated or without considering temperature.

Mathematically, 7.5 psi at STP would add 50% more power, so you'd be seeing (in theory) 459 hp at the crank on the 2GR-FSE. If this were true, you'd easily out run the IS-F since the F is heavier and makes less power.

 

mmmm that sounds nice lol 459 ...

what numbers would i be putting down @ 6 psi? at the crank

 

(306/14.696)*20.696, or 431 hp. But this assumes zero temperature increase which never happens.

 

I honestly don't remember where I'm reading boost from but I will check that tonight. I'll actually snap a picture though. Is there some where specifically I should be reading PSI from Lance?

 

If you have the ability, you'd want to measure pressure and temperature at the discharge nozzle from the supercharger (before the intercooler) and the pressure and temperature in the manifold. With these four numbers we can figure out with reasonable confidence what your actual boost does and infer what kind of horsepower you should be seeing.

 

thanks lance, what would we do with out you lol

 

IIRC I'm measuring boost from the manifold. But I will double check tonight.

 

FWIW - I recall commenting on your higher boost value in one of these threads. I could think of three scenarios.

1 – Your old IC was a different shape and less efficient w.r.t. air flow. Do you have pictures of the new and old type? Was the shape/design very different?
2 – The new IC does not remove as much heat. Higher temps mean higher boost presure but lower air density but this would usually have a negative effect on HP/TQ and increase the likelihood of combustion problems.
3 – The old IC just simply had a pinhole leak in it.

Of course, it could be any combination of the above assuming that the boost was measured in the same location for both new and old IC.