bstudey01

Thinking about ways to make more power. Has anybody run this setup before? I know it will make a lot of heat so I would also add KC and meth to cool. Has to be equivalent to a 195-200mm crank right? I currently have a 178 cp and the 84 sc. Max boost I see is about 13psi I know others see more.

lm7

We're thinking about trying this on my brothers car, should make about 17.3 lbs it's a bit bigger than a 195 lower

I think denroll runs something close to that?

BI-Performance

That would be a little over 200mm

ArmoE55

Do you have more plans to keep cooling in check (Killer Chiller/Meth etc.)? Cause you'll need it! Hell, I just have the upper pulley (stock crank pulley) and it is already making too much heat for my liking!

My rule of thumb is never to run too much boost and make power other ways ... but in your case, there's nothing left but a bigger crank unless you want to call up Weistec

black06c230

I run a 195 and with KC meth and trunk tank IATs stay pretty good.

lm7

any logs on a warm day? stay below 100?

C32owner

Yeah seem concerned about low boost with your current setup. What altitude are you at? I have no idea what boost you should be seeing with that setup but if it's on the low side, my first guess is altitude.

rockthemullet

I'm running a 180 and an 84... water injection to keep the temps down. With the BWK, I see a consistent 16psi, and you generally see a drop is boost with LTs. If you're not running LTs, you'd likely be into the mid 17s. Be careful, as some have seen boost cut starting in the mid 17s using the stock MAP sensor.

With my water injection, I see about a 15° jump at the beginning of a pull and then it flat lines throughout the rest of the pull.

Denroll

I'm running a 175/80 combo now. At sea level, I was hitting around 16.5 psi. Now I live around 4,000 ft elevation and I lost 3 psi.

You will definitely need a good high flow IC pump, bigger heat exchanger, and split system at the very minimum. Adding a water/meth injection system is not terribly expensive and has incredible results.

C32owner

Shikes it's killer isn't it. Now imagine us poor buggers up here at 5500'.. Don't mean to hijack the thread at all, sorry OP, but Denrol, As a matter of interest have you been back to the dyno at your new altitude to check the rwhp loss vs sea level, or been to the drag strip up there comparing your run times?

Denroll

I will get it on a dyno once I get the tune where I want it, but it won't be a good test for elevation. My last dyno was at Jerry's shop in Houston and it put down 527whp (94 ambient temp!). I've since went from the 84mm s/c pulley to the 80mm fixed pulley, improved the cooling system, added meth, and had some exhaust work from resonator on back.

Exotic-metal55

I have run the 185 crank with smaller SC a lot and it is equal to about 205mm crank. Going form a 185mm to 205mm ratio, is not that much of a % change, as going from stock to a 185mm. So , I never saw any major heat changes. I always run big long tubes and high flowing trunk tabnk set up to help keep heat in check. If you want to run meth, I would look into running meth through a nitrous bar. You can drill and tap your air tanks and run the bar inside the tanks, for a nice even fog set up.

BI-Performance

Just add a small wet shot and be done with it Talk about cooling the air charge, and you can jet it up or down depending on what you are trying to do.

bstudey01

Any issues with detonation running this much boost? Do you run higher octane all the time? Concerned that even with the extra cooling I could run into problems with knock. I would use meth and the killer chiller for cooling. I dont want to have to run 100 oct every time I fill either. I drive the car maybe 150 miles a week and that would get expensive

bstudey01

I'm scared of the juice!! Probably shouldn't be especially when I'm considering running such a extreme pulley setup. Actually thinking a may just step up from the 178 to a 180 asp with the 84mm s/c pulley. Add the meth while were at it and the killer chiller that I've had sitting around forever. I think that should give me the .02 sec's I'm looking for to hit 10's.

black06c230

I don't have any logs on the street but this was after my meth install and before my trunk tank.

Here is the dyno run after the meth, IATs under 100*:


I did the tank to keep street driving IATs lower in the summer months bc I was at or above ambient at 60mph, and after WOT IATs would not drop for crap. After the tank but in diff weather I hit 522hp "gaining" 16whp, of course it could be in the variance and weather being diff but when using the Torque app to view it now there is a diff. This past weekend it was 84* and my IATs were at 70-73* cruising up to 70mph, using the Torque app to just view a few things. So below ambient is certainly good and then with the meth spraying at 8psi it handles the rest of cooling and adds a good bit of power. I gained about 30whp if I recall with meth and new tune.

Exotic-metal55

My boost stayed around 16 to 16.5 psi but also combined the big pulley set up with big valve ported heads, 1 7/8 primary headers and match ported blower-air tanks and heads. All this helps to raise air flow but keep boost down. The issue then becomes tuning for the high air flow. 16-18 psi is considered streetable boost with 93 octane when tuned for it.

Also keep in mind that the 550CC injectors can become taxed in the 580 hp range or at least you should be making sure they don`t get taxed in that hp range. I went to 725cc injectors once, I moved above the 560 hp range back in 2011.

Going from a 178mm to a 180 mm will be hard to measure any gains.

BI-Performance

If your nitrous is setup properly, with a progressive kit where several parameters have to be met before it engages, you would be safer than shoving more boost via hot air into the motor. Start small and work you way up.

With a .030 nitrous and .016 fuel jets, we made 50rwhp and 105rwtq on my e55. You could jet the fuel side nice and fat too.

Those jets by the way are tiny. My IATS went way below 100* too, thats without spraying the meth.

When we sprayed the nitrous and meth, the air fuel got a little richer but the IATS plummeted lol.