just wondering since the boost pressure on the stock turbo is controlled by the ecu if i got the t25 could i make the boost pressure higher than stock with the new turbo or will i need a new ecu
With the factory Garret T15 Ball Bearing turbo, boost starts to come on from 2,200 rpm and holds good til around 5,500 rpm when it starts to drop off.
With the larger T25, it starts to generate boost from around 3,000 and holds full boost til the 6,500 soft cut, when the ECU stops the fun.
You'll probably develop morepower with the T25 as the boosted air is not as warm, since the larger turbo does not need to work as hard to generate the same boost, however you are waiting a lot longer for the fun to begin... and watching the tacho slowly climb to 3,000 before you get that shove in the back seems to take forever, especially when you can see that truck getting larger in your rear view mirror.
The T25 I had fitted for 12 months or so was from a 1992 Nissan Buebird Turbo 4WD (Japanese spec model) and was not a ball bearing core. If you get a newer T25 or even a T28 with a ball bearing core, the boost will come on line sooner, but will still not exceed the ECU setting.
Mind you, the car ran like a dream (except for the lag), and on teh dyno and road, the fuel mixtures weer still fine and there was no sign of pingign at all (at the time i had a BMW 325 Diesel air to air intercooler fitted).
Mind you, when my turbo eventually dies (it has done 250,000 or so now) I will get a T25bb or T28bb turbo, as I can pick one up here for around A$1,500(retail is A$1,900 or so), as the only three T15's in Australia are in Hyundai Australia's warehouse, and the last time I checked they were asking around A$3,000 each.
I knwo Chiptorque here in Australia (www.chiptorque.com.au) does a good turbo kit for the X3 Excel (both SOHC and DOHC), as well as for the J2 Lantra/Elantra and RD/RD2 Tiburon... except the chip that they supply for the ECU may not work too well on US spec cars.
I was speaking to them on Monday about supplying a cut down kit, comprising all the hardware (manifolds, gaskets, piping, turbo, intercooler, mounting brackets, modified sump, etc), but no chip. The idea being that anyone can then purchase the hardware, and then just needs to ECU of their choice fitted and tuned by a local workshop.
The full kit retails for A$4,950, which at the current exchange rate is around US$2,800 plus shipping
Let me know if you are interesed and I will see what I can do
Hi "Dumb".....the only chip that Superchips do for a Hyundai (last time I contacted them) was for the Scoupe Turbo!!. This doubles the boost from 7 to 14 psi. & alters the timing & fuelling to suit .
I have decided personally that this is the way to go , especially as the cost was extremely reasonable!.
Check out their Website & get a quote........good luck!!.:
Since my car is a pre-production model, and is running 10psi boost as standard, maybe I can get the chip in mine copied.
I know the chips themselves are pretty cheap, as I was looking into it a few years ago and the chip reader/burners (a small hand held unit) cost around A$1,200, with the blank chips around A$5-20 each, depending on the pin configuration.
I have never had the cover off my ECU, but beleive that the chip in ours is soldered to the circuit board, and not just easily removed in a socket. I will chat to Chiptorque about the idea, as it may be feasile, and I could have copies of my chip available for around A$100 or so each.
I do not know if their are any physical differences in the engines between my car and the UK spec S-Coupe Turbos, but beleive their is no real difference between mine and the Aust spec cars in terms of engine hardware.
As for reliability at 10 psi boost, I have been running it for a lot of km, and no problems. It may not be as powerful as a 14 psi of boost, and it would be interesting to hear from any S-Coupe Turbo owners who have run one from Superchip.
There is a site in Australia, Powerchip (www.powerchip.com.au), that also does a chip for the S-Coupe Turbo, ad costs A$690 (around US$395). I have emailed them and asked for some more informationon their chip for my car. Iknow I lookked into them a few years back, and from memory, the ECU had to be sent to them in Melbourne to get the chip changedover, but it was like a 48 hour turn around for me. I'll keep you posted on what they say.
The important thing when purchasing any chip, is to make sure you get a written of money back guarantee if you are not happy. Then when you get teh chip, do some testing before and after fitting it to make sure you are getting what you paid for. If you have access to a dyno, great, but if not, you can always do some acelleration runs from 20-80 in 2nd and 30-110 in 3rd. Also, if you do not have a boost gauge, hook up one so you can see what the boost really was before and after, to make sure it has been increased like they claim, but not to silly levels of boost.
Mark / Bretton.......I have Superchips Uk`s e-mailed quotation to me in black & white = £272.00 including fitting & v.a.t......they even told me my nearest appointed fitter!. (Wings of Peterborough).
I must admit that all the prices I`ve seen in the mags. seem to say £450 or so for a Turbo car.....I think it`s the dealers because all the work`s in the programming by laptop & rolling road etc. & Superchips are not giving them enough margin to cover this.
Anyway, I`d have to fit an oil-cooler before I even thought about raising the boost by chipping!.uzzled:
Since when a chip increase trubo boost ?????? the provide the mapping but you have to boost with a manuel boost controler...... and 14psi..... thinking about a intercoller ??? i know the scoupe have 7.5:1 compresion but i'm pretty shure it would help :
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ACCENT GT 96 Dead Rip
SCOUPE TURBO 93 Dead Rip
The boost in the S-Coupe GT Turbo IS controlled by the ECU, by way of an electronic boost control function it has built into the software and a boost control solenoid located underneath the battery tray. Fitting a manual boost control by way of a bleed valve does not work, as it onyl generates a CHECK ENGINE light and puts the engine into LIMP HOME mode diagnosing that their is a leak in the boost control system.
This topic has recently been discussed in these forums if you'd liek to read more about it.
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garret t25 turbo on scoupe
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