Schuey

http://cgi.ebay.com/ebaymotors/ws/eB...sPageName=WDVW

I contacted him on this for a part number, but he didn't have one and stated it was a "clone" chip (it states factory chip in ad)...so I also contacted buyer of the chip to see if he did a dyno, etc. and/or had any issues...

25hp for $40...sounds great...too great...

soooo...does anyone have experience with this guy?

Smokin

It usually is too good to be true. I believe a chip needs to be mapped for your individual setup to work well enough to boost horsepower significantly.

Ask him if he can show true "before" and "after" dyno results to back up his claim. If he is a true master tech of 20 years he should already have this info posted on his auction.

Just my .02

Geoffrey

The dyno testing I've done shows a 11hp and 12ft/lb of torque difference at the rear wheels on a Dynapack dyno between a stock C2 chip and a real 1992 Euro Carrera Cup brain.

martinreinhardt

The CUP car only had 10 more horspower and it is probably mainly due to the exhaust system and the cut off Cup style airbox. Plus most performance chips only raise the rev limiter. I would say: save your money and future engine problems.

ltc

I thought the 964 Cups were 270hp, which would be more than 10hp increase over a standard 964?

martinreinhardt

This is true for the N/GT based cup car (275hp) 1992-, but the 1990-1991 C2 based cup cars had 265 horsepower. (I guess +15hp)

Nevermind that would be +25

Tom W

My dyno data shows 234 hp at the wheels with a cut off air box, clean K&N filter and secondary bypass. I get 244 hp if I add a cat bypass and leave everything else the same. Did a cup car come with a cat? If not, I have an idea where some of the additional hp came from.

Geoffrey

I believe the HP increase in the Cup car is from the increased timing they run. This is from the download of the timing maps from both the C2 and Cup chips. The Cup cars came with a cat.

JasonAndreas

Dyno-testing (I suppose its estimated flywheel) in Adrian's book showed a stock Carrera2 at 258Hp, the same C2 with a genuine Cup DME at 281Hp and the same car with an genuine RS (NGT) DME at 282Hp.

Geoffrey,
You don't by chance have a genuine RS eprom stored on your computer or the actual chip in hand do you?

JC in NY

Also, Cup cars run true "blueprinted" 11.3:1 compression. Geoffrey, do you have real dyno figures for a healthy Cup engine in race trim (cat, open exhaust, open airbox)? I think Porsche's numbers are low.

Cupcar

Here is chassis dyno run of a factory Cup engine with cut off airbox, RS chip in place, FVD cat bypass muffler and factory primary Cup straight through muffler with no secondary. 100 octane gas.

H964

its funny i bought that chip a while back from the same seller but i have yet to install it, but i did send emails to previous buyers of the same chip that left him positive feedback, and all of them said that the car felt smoother and quicker. i will let you know when i install it may be in the next week or 2
later

Geoffrey

John, I don't believe that the compression ratio on a Cup engine has been altered from a stock c2 engine, although the parts are hand picked to be closer tolerances than a stock C2. I have yet to see one that is at 11.3:1 compression. They all have measured 10.7:1 compression where C2s in general have ranged from 10.4-10.7:1 compression. We've had the cylinders and pistons machined to effectively raise the "net dome volume" to obtain 11.3:1.

The engines that I've tested have been true 11.3:1 blueprinted engines made for GTC-1 rules which produce 10-15 more HP than Cupcar's dyno shows. They were running no cat, no muffler, and 93 octane street fuel. From His dyno, you can see that the AFRs get dangerously lean above 5000rpm. Although the ones I've tested have similar AFR curves, they are about 1 full AFR point richer than Cupcar's across the range and suspect that his is not correct and the Dyno's sensor was perhaps failing. Unfortunately, with a 1992 Cup car, you cannot alter the fueling like you can with a 1990 without burning a new chip.

Schuey

like posted here before, in Adrian's book the DME swap showed quite a boost in HP and this is what got me thinking Cup/RS chip...

warmfuzzies

Hmm apart from chip the engines were all blueprinted, this in itself could account for 10BHP.

kevin