Nitrous time, But I want to do it right

[420a-t]

As some of you know, I was having a hard time spooling my Holset H1E turbo up. I have a 3800rpm restall, but I still couldn't get it to stall more than 2250rpm's. I tinkered with antilag, timing, afr's, etc. and I still couldn't get anything better than that. So, I decided to buy a nitrous kit. I bought a NOS sniper kit made for a carb, but I bought everything to covert it to a wet kit (minus bottle heater and blowdown tube).

I want to start with a 50 shot, but what would be the best way to launch this thing with nitrous, dsmlink, timing, etc.? I heard tuning nitrous on too early in the rpm range can kill motors fast, but I would need to turn it on before 2500rpm's toget my turbo to start spooling. Would this be safe? Or, should I just launch my car without nitrous and have it turn on at 2500 rpm's so right when I leave the line it spools? Is there a big difference in results between the two ways?

My other quesion is to the guys that have nitrous, did you run the line underneath the car from the bottle to the engine bay, or did you go inside the cockpit? Thanks for any and all advice.

 

[Rob10_99]

Wow, that is low for N02, the routing can go either way, I usually route it the easiest way to do it inside the car.
Take up the mats/carpet and fish that thing through. By the ecu harness is usually a good place to stuff something through, plenty of room.

 

[HighPSI TSi Guy]

I ran mine through the car. I spray the nitrous while on the stall at 3000 RPM to get it up on the stall quick then shut it off at 4500 RPM and let the boost take it from there without any nitrous, car will hold 5000 RPM and 20 PSI on the line without nitrous doing it that way. You really need a different converter or to do something else to fix that 2200 RPM thing. I would NOT spray it that low. 3000 is as low as I'd go. And even that I'm a little sketch on, but I do it because I have to.

 

[420a-t]

Thanks for the replys. My vacuum is only at 7-8 inhg at idle and always has been, but since I put a new head on, cams, turbo, new tranny in it's been around 5-6 inhg at idle. Would that cause it to be hard to stall my car up? I have no boost leaks. I've checked 3 times now.

 

[HighPSI TSi Guy]

Cams can have a HUGE effect on stall speed, due to changing the power curve. BUT there's a lot more to it than that. I've gotten cars that wouldnt stall up to stall up before just by messing with simple things. What cams do you have?

 

[420a-t]

I have comp 101100 and 101200 cams, same specs as the fp 1's and 2's. I don't have adjustable cam gears, should I put that on my "next things to buy so I can get this sumbitch launching again?" list? If I need another converter, what should I get if the stock one didn't work, and my 3800rpm stall one didn't work either? I really hope I can get it up to at least 3000pm's so I can start spraying before I have to buy anything else...

 

[HighPSI TSi Guy]

3800 is too tight for a big turbo. Just tell whoever you get it from you need the highest stalling restall they can do. I would get cam gears and play with them next though.

 

[420a-t]

Cool. Thanks for the help. Before I made this thread I already purchased a nitrous kit, if I can't get it up to 3000rpms to let me spray it after that, then I'll be getting cam gears and over the winter, a new converter. Thanks

 

[420a-t]

One more question... I know you guys tell me to not spray that low in the rpm's which I wont, but there's a guy on the dsmlink forums and he starts his nitrous at 2k to redline to spool his turbo. My question is why shouldn't you spray that low in the rpm's? Thanks

 

[HighPSI TSi Guy]

One more question... I know you guys tell me to not spray that low in the rpm's which I wont, but there's a guy on the dsmlink forums and he starts his nitrous at 2k to redline to spool his turbo. My question is why shouldn't you spray that low in the rpm's? Thanks

It varies from motor to motor due to geometry differences but generally you don't want to spray it at lower piston speeds due to the shock of the instant power, also lower RPMs increase chances of nitrous backfire.

 

[90laserRSfwd]

It varies from motor to motor due to geometry differences but generally you don't want to spray it at lower piston speeds due to the shock of the instant power, also lower RPMs increase chances of nitrous backfire.

And BELIEVE me you DO NOT want to experience a nitrous back fire situation, ever...