TopGum

got this from Mike B's response on the Comptech website :wow:

fla-tls

I'm not going to even try that on my 5 speed auto tranny...

Beiruty

they will not gaurantee... your clutch nor your tranny.. and if you downshifted and blew your engine do not come to us crying .... go to mama...

roadman

These are substantial gains, when you discount the gains that headers give (+/- 35hp) the supercharger adds about 30Hp as well. The torque figures stand out. What is puzzling is that the characteristics of the engine have changed with peak power occuring at 5k RPM, then a big drop off in power then another peak. I have never seen an engine have such a torque drop off then pick back up again. The car must be substantially quicker, being that up-shifts can occur at 5k rpm. Their is a minimal gain (6hp) be revving the engine another 1800rpm to 6800rpm.

adam

sounds like they need to tune it. seeing that on a graph would be ugly

ferizzo

I thought the headers were on before and after the supercharger was added so the HP and Torque gains would be from the SC alone (give or take a little). My understanding of the original post was that the SC gave a peak of about 60 hp and 60 ftlbs. So with the headers thats about 90-100 hp to the wheels! So did the CLS 6MT dyno at about 300 hp to the wheels and 260-270 torque?

roadman

ferizzo,

You are right, I misread the headers portion. It is interesting to see what happened to VTEC, in a NA car the surge occurs at about 5500rpm. In the case of the supercharger the drop off in power occurs between 5k and 6k rpm VTEC ranges. From a racing standpoint, which is why someone would put a supercharger in to begin with the usable rpm range is 5000rpm.

Adam is right, it sounds like it does need to tuned, the dyno graph would look odd with such a sudden drop off then second burst. It almost sounds like either the ignition or the fuel delivery systems can not handle the power and need to catch up.

I can't imagine the auto tranny being able to handle an extra 100hp and maybe 80ftlbs of torque

samkws

holy crap...63 more hp...

TopGum

the tuning issue might make the case for the V-AFC

fla-tls

I must say - Acura needs to get with GM for advice on their tranny. I recently went to a speed shop where guys were running modified camaros. The top 1/4 miler in the bunch was running a --- I'm not kidding here --- a 400 shot of nitrous. That was not a typo - the guy has two large bottles in the car - one for each stage (2 stage). In fact, I held a bent/melted piston from the resulting blown engine in my hand...

The guy owns the engine/tranny shop, built up the engine, knew he'd eventually blow the engine, and was apparently increasing NO2 to find the limits on his LS1 engine. He finally blew the LS1 at well over 500 hp - running 10's in 1/4. (It was otherwise normally aspirated.)

THE POINT IS - he was still running the same stock 4L60E automatic transmission on that car that I used to have in my '94 Formula. No mods to the tranny - it's ready to go for another 1/4 mile...

T Ho

One thing to note- the physical size of GM trannies (like the 4L60) are much larger than what's in our TL-S's. And that ultimately determines strength.
And the SC curve may not dip at all- it may be that the stock curve peaks under it in the 6000 range, and the SC curve is higher and flatter. Let's see the graphs.

Todd

LiQiCE

Graphs are up at Comptech's site!!!

Comptech Supercharged CL-S 6-speed dyno

299 wheel horsepower at 6800 rpms!

A 5-speed automatic TL-S isn't going to be able to push 299 whp at 6800 rpms because of the drivetrain power loss but I'd still imagine that you'd get somewhere around 260 whp considering there's a ~60hp max gain on the 6-speed and the TL-S puts around 200 hp to the ground ... Not too shabby!

samkws

GM makes world class trannys...

look at the 5 series and bentleys and rolls royce...all GM products....and more...

Datta540i

my 540i 6 speed uses a getrag type II tranny
Only the 528i use GM trannies. 540i uses Getrag auto trannies

roadman

People think that manual trannies are the best for racing, the fact is you cannot possibly shift a manual as fast as an Auto can. The Auto robs more HP, and is far less fun to drive, until you get stuck in bumper to bumber traffic, then the manual really stinks.

Well with the CT supercharger costing $4500 not installed plus the cost of headers and intake, this extra boost could easily add up to $6 to $7k installed. Then you have a killer engine but what about the rest of the car. This reminds me of guys who used to put Chevy 350 engines into Chevy Vega's.

Next you have to do tires, wheels, suspension, don't forget the tranny. For all this why not just get an S4 or a 540 in the first place ? At least it will have a warranty and you could get something back if you sell it.