About to order a kit and wondering how well the stock injectors will run on a full bolt on car with a 75 to a 150 shot?

 

If you run a wet kit, injectors wont be a factor as it sprays fuel with the nitrous.

 

Oh ok that makes sense. I just ordered the kit and it is a wet system.

 

How much do you plan on spraying

 

Kit says it comes with 75 to 125 shot . I'll start with the 75 shot.

 

get some good videos if you can. these engines are pretty stout from what I have read, even the non-PP ones. looking forward to seeing it in action!

 

word of advice, get a dedicated nitrous tune. I was going to spray a 150 shot but I'm going weistec instead. And I'm pretty sure its known from dadsc63 that these cars can handle a safe setup 200 shot.

 

Following

 

Pus*y

 

Here is the kit I bought... Peter is running this kit and says the car loves it but the transmission starts to slip around 200 shot.

https://www.zex.com/efi-v8-universal-wet-blackout-nitrous-system.html

 

Which kit did you go with?

nitrous outlet, nos, nitrous express, zex? And I’m assuming it’s a universal kit since nothing is made for our cars?

 

It's from zex

 

I'm going to stick with a 75 shot and see how the car lasts before going into a higher shot and dedicated tune.

 

I am also planning to go down the same path as yours. When I was thinking about which kit to buy, I was thinking I should be buying a two step trigger like winmax which can trigger nitrous based on RPM and TPS together so that I can protect my engine from over revving due to nitrous. My plan is to run 75 to 100 shots max and would never go higher (at least that's what I say for now lol). What are your thoughts on this?

Also, for better mixing and atomization I was thinking of going two nozzle one each after each airbox. I know it mixes ultimately in the plenum but it was just one of my thoughts. What do you think about this?

Furthermore, I see you are running are running E-85 as well. What are your thoughts on stock fuel pumping keeping up with E85 and 100 wet shots?

Thank you for looking into my questions. I will be ordering my kit too soon. Best of luck with you build.

 

I would not run e85 with nos as it adds more problems and just use pump gas. I would also not inject there in the boxes because it's a wet setup and you will have gas and nos hitting your maf sensors. I plan on tapping the plastic y pipe near the bottom right between the 2 pipes merging.

 

Sorry for misunderstanding. I mean to say, one injector in each side of the Y Pipe after MAF instead of one in the Y Pipe.

Also what do you think about TPS and RPM trigger instead of just RPM?

 

I believe the kit I got taps into tps signal so you can set it at say 70% throttle. I'll know more once I get it up and running.

 

Got it. Keep us posted.

I was also looking at this kit but later thought I dont wanna over rev the engine and damage the valve train hence decided to look into winmax. Anyways your experience will be valuable to me. I will look forward to it.

 

That was fast lmao

 

Doc Oc ran a 75 shot I believe with e85 and 550cc injectors.
He said go up a size fuel pill to make up for the needed fuel for ethanol.
https://mbworld.org/forums/c63-amg-w...s-install.html

 

car doesn’t need a nitrous tune with 75-100 shot. That all bro science. I used to have a stand alone fuel cell and ran up to 150 shot w c16 in fuel cell.... Same tune no timing retard/ no knock at all when I was logging. In fact when you start spraying, these cars afr get slightly richer.

over 150 shot the car needs the dedicated fuel cell and I’d pull 2-4 degrees just for piece of mind. 200 shot the mct trans will take a ****.

A friend of mine has Weistec e63 stage 2 kit. I’ve been in the car and that car feels good for one pull then feels slow. heats up pretty quick. Also, the drivability was odd. Putty around town the car felt jerky AF. Like a Eurocharged v6 tune. Honestly the car only felt good at WOT. I know someone will say you can tune the car and get rid of the issues but I’ve read more horror stories of people other than Weistec tune and the cars behave weird. The only shop that knows how to tune these cars with a blower is International Autohaus. Those MF know what’s up. And their EVOtech tuner is beast.


Theres pros and cons to both systems. Nitrous is cheap. But a lot more to worry about. Blower is always on and never have to refill the bottle but at a price of 10k... without install.

Also to touch on nitrous with e85 kit. You can run it but keep in mind the tip in, is way leaner and fuel system is already stressed from pulling fueling from the rail. 75 shot is where I would stay without a stand alone fuel cell.

There’s also zero need for dual nozzles. Atomization is fine up 150. Dual nozzles are meant for a second stage. Wet kits need to be after MAF.

 

Thank you for clarifying about the dual nozzle vs single nozzle system. Do you know if the torque converter based 7 speed can take upto 600whp (with nitrous) without slipping? I have heard a lot about MCTs and how much they can take but not much about torque converter ones. Also with 75 shots do you think we have a fear of hitting the rev limiter with just a TPS based trigger? is it worth investing in WINMAX which is TPS + RPM based trigger.

Thanks for reply.

 

If you not launching the car and just doing highway pulls. You’ll be fine on 75 shot. 100 shot will be pushing it with that transmission. I spray through the gear on my car. The upshift happens so fast nothing to worry about. Think of this... when you have a supercharger, does the supercharger turn off when you shift?... a window switch is nice. But those things are only worth it when running 2 stages or really trying to maximize traction at the strip.

less is more. 75 shot will put a healthy c63 With headers/rows with good tune at 560ish whp.

Do the maintenance first on car before throwing it on the bottle.

also invest in a good bottle heater. Don’t blow torch it like idiots on YouTube. That doesn’t do **** for reaching and maintaining bottle pressure. You wanna be at 900-950 bottle pressure for max power.

 

So much sense in one post

Just thing I would add to this, is regarding the part about throttle tip in. As best practice, what I normally do is run a slightly shorter fuel line to the injector (say 1.5 inches) and it really makes a good difference to any lean hits. Also, progressive controllers are quite cheap nowadays and are a good thing to add to any system. Let's say you want to run...100hp (a nice round number) - you can set the progressive controller to start at 50% (50hp) and have it build to 10% (100hp) over the course of 2 seconds. It'll help to even out the cylinder pressures at the lower rpm where you start the pull and give you even more peace of mind.

I've run wet direct port systems in the past, but also a nice dry set up. If you have the injectors and a good standalone with wideband, a dry system is sooo much better because you can fine tune the mixture and pull timing so that it's a perfect mixture every time AND it won't mean you have to run a conservative NA tune for normal daily driving. Of course the only snag with this method is that I can't run it as a direct port system and I get all nervous about running more than 20hp per cylinder if I can't ensure that each cylinder is getting an even mix. I'd love to see a direct port system on an M156 with beautifully crafted hard-lines inside the intake manifold. Anyway, I've rambled on quite a bit. Be nice to see the progress as this thread develops.

LMAO I used to do this back in the day....in my defence, it kinda used to work....but yeah...it doesn't maintain pressure for long like how a nice heater jacket does. Oh, to be young again....

 

That surging/jerkiness is a standard airbox issue from what I’m told mate. My car had it really bad! At its worst it used to chug down the road like I was on and off the accelerator on purpose.
My new intake is now on and I should get the car back next week, fingers crossed it will be all smooth now.